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parallel.c File Reference
#include "postgres.h"
#include "access/parallel.h"
#include "access/session.h"
#include "access/xact.h"
#include "access/xlog.h"
#include "catalog/namespace.h"
#include "commands/async.h"
#include "executor/execParallel.h"
#include "libpq/libpq.h"
#include "libpq/pqformat.h"
#include "libpq/pqmq.h"
#include "miscadmin.h"
#include "optimizer/planmain.h"
#include "pgstat.h"
#include "storage/ipc.h"
#include "storage/sinval.h"
#include "storage/spin.h"
#include "tcop/tcopprot.h"
#include "utils/combocid.h"
#include "utils/guc.h"
#include "utils/inval.h"
#include "utils/memutils.h"
#include "utils/resowner.h"
#include "utils/snapmgr.h"
#include "utils/typcache.h"
Include dependency graph for parallel.c:

Go to the source code of this file.

Data Structures

struct  FixedParallelState
 

Macros

#define PARALLEL_ERROR_QUEUE_SIZE   16384
 
#define PARALLEL_MAGIC   0x50477c7c
 
#define PARALLEL_KEY_FIXED   UINT64CONST(0xFFFFFFFFFFFF0001)
 
#define PARALLEL_KEY_ERROR_QUEUE   UINT64CONST(0xFFFFFFFFFFFF0002)
 
#define PARALLEL_KEY_LIBRARY   UINT64CONST(0xFFFFFFFFFFFF0003)
 
#define PARALLEL_KEY_GUC   UINT64CONST(0xFFFFFFFFFFFF0004)
 
#define PARALLEL_KEY_COMBO_CID   UINT64CONST(0xFFFFFFFFFFFF0005)
 
#define PARALLEL_KEY_TRANSACTION_SNAPSHOT   UINT64CONST(0xFFFFFFFFFFFF0006)
 
#define PARALLEL_KEY_ACTIVE_SNAPSHOT   UINT64CONST(0xFFFFFFFFFFFF0007)
 
#define PARALLEL_KEY_TRANSACTION_STATE   UINT64CONST(0xFFFFFFFFFFFF0008)
 
#define PARALLEL_KEY_ENTRYPOINT   UINT64CONST(0xFFFFFFFFFFFF0009)
 
#define PARALLEL_KEY_SESSION_DSM   UINT64CONST(0xFFFFFFFFFFFF000A)
 

Typedefs

typedef struct FixedParallelState FixedParallelState
 

Functions

static void HandleParallelMessage (ParallelContext *pcxt, int i, StringInfo msg)
 
static void WaitForParallelWorkersToExit (ParallelContext *pcxt)
 
static parallel_worker_main_type LookupParallelWorkerFunction (const char *libraryname, const char *funcname)
 
ParallelContextCreateParallelContext (const char *library_name, const char *function_name, int nworkers)
 
void InitializeParallelDSM (ParallelContext *pcxt)
 
void ReinitializeParallelDSM (ParallelContext *pcxt)
 
void LaunchParallelWorkers (ParallelContext *pcxt)
 
void WaitForParallelWorkersToFinish (ParallelContext *pcxt)
 
void DestroyParallelContext (ParallelContext *pcxt)
 
bool ParallelContextActive (void)
 
void HandleParallelMessageInterrupt (void)
 
void HandleParallelMessages (void)
 
void AtEOSubXact_Parallel (bool isCommit, SubTransactionId mySubId)
 
void AtEOXact_Parallel (bool isCommit)
 
void ParallelWorkerMain (Datum main_arg)
 
void ParallelWorkerReportLastRecEnd (XLogRecPtr last_xlog_end)
 

Variables

int ParallelWorkerNumber = -1
 
volatile bool ParallelMessagePending = false
 
bool InitializingParallelWorker = false
 
static FixedParallelStateMyFixedParallelState
 
static dlist_head pcxt_list = DLIST_STATIC_INIT(pcxt_list)
 
struct {
   const char *   fn_name
 
   parallel_worker_main_type   fn_addr
 
InternalParallelWorkers []
 

Macro Definition Documentation

#define PARALLEL_ERROR_QUEUE_SIZE   16384

Definition at line 50 of file parallel.c.

Referenced by InitializeParallelDSM(), ParallelWorkerMain(), and ReinitializeParallelDSM().

#define PARALLEL_KEY_ACTIVE_SNAPSHOT   UINT64CONST(0xFFFFFFFFFFFF0007)

Definition at line 66 of file parallel.c.

Referenced by InitializeParallelDSM(), and ParallelWorkerMain().

#define PARALLEL_KEY_COMBO_CID   UINT64CONST(0xFFFFFFFFFFFF0005)

Definition at line 64 of file parallel.c.

Referenced by InitializeParallelDSM(), and ParallelWorkerMain().

#define PARALLEL_KEY_ENTRYPOINT   UINT64CONST(0xFFFFFFFFFFFF0009)

Definition at line 68 of file parallel.c.

Referenced by InitializeParallelDSM(), and ParallelWorkerMain().

#define PARALLEL_KEY_ERROR_QUEUE   UINT64CONST(0xFFFFFFFFFFFF0002)

Definition at line 61 of file parallel.c.

Referenced by InitializeParallelDSM(), ParallelWorkerMain(), and ReinitializeParallelDSM().

#define PARALLEL_KEY_FIXED   UINT64CONST(0xFFFFFFFFFFFF0001)
#define PARALLEL_KEY_GUC   UINT64CONST(0xFFFFFFFFFFFF0004)

Definition at line 63 of file parallel.c.

Referenced by InitializeParallelDSM(), and ParallelWorkerMain().

#define PARALLEL_KEY_LIBRARY   UINT64CONST(0xFFFFFFFFFFFF0003)

Definition at line 62 of file parallel.c.

Referenced by InitializeParallelDSM(), and ParallelWorkerMain().

#define PARALLEL_KEY_SESSION_DSM   UINT64CONST(0xFFFFFFFFFFFF000A)

Definition at line 69 of file parallel.c.

Referenced by InitializeParallelDSM(), and ParallelWorkerMain().

#define PARALLEL_KEY_TRANSACTION_SNAPSHOT   UINT64CONST(0xFFFFFFFFFFFF0006)

Definition at line 65 of file parallel.c.

Referenced by InitializeParallelDSM(), and ParallelWorkerMain().

#define PARALLEL_KEY_TRANSACTION_STATE   UINT64CONST(0xFFFFFFFFFFFF0008)

Definition at line 67 of file parallel.c.

Referenced by InitializeParallelDSM(), and ParallelWorkerMain().

#define PARALLEL_MAGIC   0x50477c7c

Definition at line 53 of file parallel.c.

Referenced by InitializeParallelDSM(), and ParallelWorkerMain().

Typedef Documentation

Function Documentation

void AtEOSubXact_Parallel ( bool  isCommit,
SubTransactionId  mySubId 
)

Definition at line 915 of file parallel.c.

References DestroyParallelContext(), dlist_head_element, dlist_is_empty(), elog, ParallelContext::subid, and WARNING.

Referenced by AbortSubTransaction(), and CommitSubTransaction().

916 {
917  while (!dlist_is_empty(&pcxt_list))
918  {
919  ParallelContext *pcxt;
920 
922  if (pcxt->subid != mySubId)
923  break;
924  if (isCommit)
925  elog(WARNING, "leaked parallel context");
927  }
928 }
SubTransactionId subid
Definition: parallel.h:35
void DestroyParallelContext(ParallelContext *pcxt)
Definition: parallel.c:623
#define WARNING
Definition: elog.h:40
#define dlist_head_element(type, membername, lhead)
Definition: ilist.h:487
static bool dlist_is_empty(dlist_head *head)
Definition: ilist.h:289
static dlist_head pcxt_list
Definition: parallel.c:110
#define elog
Definition: elog.h:219
void AtEOXact_Parallel ( bool  isCommit)

Definition at line 934 of file parallel.c.

References DestroyParallelContext(), dlist_head_element, dlist_is_empty(), elog, and WARNING.

Referenced by AbortTransaction(), and CommitTransaction().

935 {
936  while (!dlist_is_empty(&pcxt_list))
937  {
938  ParallelContext *pcxt;
939 
941  if (isCommit)
942  elog(WARNING, "leaked parallel context");
944  }
945 }
void DestroyParallelContext(ParallelContext *pcxt)
Definition: parallel.c:623
#define WARNING
Definition: elog.h:40
#define dlist_head_element(type, membername, lhead)
Definition: ilist.h:487
static bool dlist_is_empty(dlist_head *head)
Definition: ilist.h:289
static dlist_head pcxt_list
Definition: parallel.c:110
#define elog
Definition: elog.h:219
ParallelContext* CreateParallelContext ( const char *  library_name,
const char *  function_name,
int  nworkers 
)

Definition at line 140 of file parallel.c.

References Assert, dlist_push_head(), DSM_IMPL_NONE, dynamic_shared_memory_type, ParallelContext::error_context_stack, error_context_stack, ParallelContext::estimator, ParallelContext::function_name, GetCurrentSubTransactionId(), IsInParallelMode(), IsolationIsSerializable, ParallelContext::library_name, MemoryContextSwitchTo(), ParallelContext::node, ParallelContext::nworkers, palloc0(), pstrdup(), shm_toc_initialize_estimator, ParallelContext::subid, and TopTransactionContext.

Referenced by ExecInitParallelPlan().

142 {
143  MemoryContext oldcontext;
144  ParallelContext *pcxt;
145 
146  /* It is unsafe to create a parallel context if not in parallel mode. */
148 
149  /* Number of workers should be non-negative. */
150  Assert(nworkers >= 0);
151 
152  /*
153  * If dynamic shared memory is not available, we won't be able to use
154  * background workers.
155  */
157  nworkers = 0;
158 
159  /*
160  * If we are running under serializable isolation, we can't use parallel
161  * workers, at least not until somebody enhances that mechanism to be
162  * parallel-aware.
163  */
165  nworkers = 0;
166 
167  /* We might be running in a short-lived memory context. */
169 
170  /* Initialize a new ParallelContext. */
171  pcxt = palloc0(sizeof(ParallelContext));
173  pcxt->nworkers = nworkers;
174  pcxt->library_name = pstrdup(library_name);
175  pcxt->function_name = pstrdup(function_name);
178  dlist_push_head(&pcxt_list, &pcxt->node);
179 
180  /* Restore previous memory context. */
181  MemoryContextSwitchTo(oldcontext);
182 
183  return pcxt;
184 }
MemoryContext TopTransactionContext
Definition: mcxt.c:48
static void dlist_push_head(dlist_head *head, dlist_node *node)
Definition: ilist.h:300
char * pstrdup(const char *in)
Definition: mcxt.c:1076
shm_toc_estimator estimator
Definition: parallel.h:41
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
SubTransactionId subid
Definition: parallel.h:35
ErrorContextCallback * error_context_stack
Definition: elog.c:88
bool IsInParallelMode(void)
Definition: xact.c:914
char * function_name
Definition: parallel.h:39
int dynamic_shared_memory_type
Definition: dsm_impl.c:113
#define shm_toc_initialize_estimator(e)
Definition: shm_toc.h:49
void * palloc0(Size size)
Definition: mcxt.c:877
char * library_name
Definition: parallel.h:38
#define Assert(condition)
Definition: c.h:664
SubTransactionId GetCurrentSubTransactionId(void)
Definition: xact.c:650
#define DSM_IMPL_NONE
Definition: dsm_impl.h:17
dlist_node node
Definition: parallel.h:34
ErrorContextCallback * error_context_stack
Definition: parallel.h:40
#define IsolationIsSerializable()
Definition: xact.h:44
static dlist_head pcxt_list
Definition: parallel.c:110
void DestroyParallelContext ( ParallelContext pcxt)

Definition at line 623 of file parallel.c.

References ParallelWorkerInfo::bgwhandle, dlist_delete(), dsm_detach(), ParallelWorkerInfo::error_mqh, ParallelContext::function_name, HOLD_INTERRUPTS, i, ParallelContext::library_name, ParallelContext::node, ParallelContext::nworkers_launched, pfree(), ParallelContext::private_memory, RESUME_INTERRUPTS, ParallelContext::seg, shm_mq_detach(), TerminateBackgroundWorker(), WaitForParallelWorkersToExit(), and ParallelContext::worker.

Referenced by AtEOSubXact_Parallel(), AtEOXact_Parallel(), and ExecParallelCleanup().

624 {
625  int i;
626 
627  /*
628  * Be careful about order of operations here! We remove the parallel
629  * context from the list before we do anything else; otherwise, if an
630  * error occurs during a subsequent step, we might try to nuke it again
631  * from AtEOXact_Parallel or AtEOSubXact_Parallel.
632  */
633  dlist_delete(&pcxt->node);
634 
635  /* Kill each worker in turn, and forget their error queues. */
636  if (pcxt->worker != NULL)
637  {
638  for (i = 0; i < pcxt->nworkers_launched; ++i)
639  {
640  if (pcxt->worker[i].error_mqh != NULL)
641  {
643 
644  shm_mq_detach(pcxt->worker[i].error_mqh);
645  pcxt->worker[i].error_mqh = NULL;
646  }
647  }
648  }
649 
650  /*
651  * If we have allocated a shared memory segment, detach it. This will
652  * implicitly detach the error queues, and any other shared memory queues,
653  * stored there.
654  */
655  if (pcxt->seg != NULL)
656  {
657  dsm_detach(pcxt->seg);
658  pcxt->seg = NULL;
659  }
660 
661  /*
662  * If this parallel context is actually in backend-private memory rather
663  * than shared memory, free that memory instead.
664  */
665  if (pcxt->private_memory != NULL)
666  {
667  pfree(pcxt->private_memory);
668  pcxt->private_memory = NULL;
669  }
670 
671  /*
672  * We can't finish transaction commit or abort until all of the workers
673  * have exited. This means, in particular, that we can't respond to
674  * interrupts at this stage.
675  */
676  HOLD_INTERRUPTS();
679 
680  /* Free the worker array itself. */
681  if (pcxt->worker != NULL)
682  {
683  pfree(pcxt->worker);
684  pcxt->worker = NULL;
685  }
686 
687  /* Free memory. */
688  pfree(pcxt->library_name);
689  pfree(pcxt->function_name);
690  pfree(pcxt);
691 }
void shm_mq_detach(shm_mq_handle *mqh)
Definition: shm_mq.c:775
dsm_segment * seg
Definition: parallel.h:42
static void WaitForParallelWorkersToExit(ParallelContext *pcxt)
Definition: parallel.c:583
#define RESUME_INTERRUPTS()
Definition: miscadmin.h:117
ParallelWorkerInfo * worker
Definition: parallel.h:45
void pfree(void *pointer)
Definition: mcxt.c:949
char * function_name
Definition: parallel.h:39
shm_mq_handle * error_mqh
Definition: parallel.h:28
BackgroundWorkerHandle * bgwhandle
Definition: parallel.h:27
static void dlist_delete(dlist_node *node)
Definition: ilist.h:358
int nworkers_launched
Definition: parallel.h:37
void TerminateBackgroundWorker(BackgroundWorkerHandle *handle)
Definition: bgworker.c:1171
char * library_name
Definition: parallel.h:38
dlist_node node
Definition: parallel.h:34
void dsm_detach(dsm_segment *seg)
Definition: dsm.c:726
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:115
int i
void * private_memory
Definition: parallel.h:43
static void HandleParallelMessage ( ParallelContext pcxt,
int  i,
StringInfo  msg 
)
static

Definition at line 810 of file parallel.c.

References _, ErrorData::context, ErrorData::elevel, elog, ERROR, ParallelContext::error_context_stack, error_context_stack, ParallelWorkerInfo::error_mqh, force_parallel_mode, FORCE_PARALLEL_REGRESS, i, StringInfoData::len, Min, NotifyMyFrontEnd(), ParallelWorkerInfo::pid, pq_endmessage(), pq_getmsgbyte(), pq_getmsgend(), pq_getmsgint(), pq_getmsgrawstring(), pq_parse_errornotice(), psprintf(), pstrdup(), shm_mq_detach(), ThrowErrorData(), and ParallelContext::worker.

Referenced by HandleParallelMessages().

811 {
812  char msgtype;
813 
814  msgtype = pq_getmsgbyte(msg);
815 
816  switch (msgtype)
817  {
818  case 'K': /* BackendKeyData */
819  {
820  int32 pid = pq_getmsgint(msg, 4);
821 
822  (void) pq_getmsgint(msg, 4); /* discard cancel key */
823  (void) pq_getmsgend(msg);
824  pcxt->worker[i].pid = pid;
825  break;
826  }
827 
828  case 'E': /* ErrorResponse */
829  case 'N': /* NoticeResponse */
830  {
831  ErrorData edata;
832  ErrorContextCallback *save_error_context_stack;
833 
834  /* Parse ErrorResponse or NoticeResponse. */
835  pq_parse_errornotice(msg, &edata);
836 
837  /* Death of a worker isn't enough justification for suicide. */
838  edata.elevel = Min(edata.elevel, ERROR);
839 
840  /*
841  * If desired, add a context line to show that this is a
842  * message propagated from a parallel worker. Otherwise, it
843  * can sometimes be confusing to understand what actually
844  * happened. (We don't do this in FORCE_PARALLEL_REGRESS mode
845  * because it causes test-result instability depending on
846  * whether a parallel worker is actually used or not.)
847  */
849  {
850  if (edata.context)
851  edata.context = psprintf("%s\n%s", edata.context,
852  _("parallel worker"));
853  else
854  edata.context = pstrdup(_("parallel worker"));
855  }
856 
857  /*
858  * Context beyond that should use the error context callbacks
859  * that were in effect when the ParallelContext was created,
860  * not the current ones.
861  */
862  save_error_context_stack = error_context_stack;
864 
865  /* Rethrow error or print notice. */
866  ThrowErrorData(&edata);
867 
868  /* Not an error, so restore previous context stack. */
869  error_context_stack = save_error_context_stack;
870 
871  break;
872  }
873 
874  case 'A': /* NotifyResponse */
875  {
876  /* Propagate NotifyResponse. */
877  int32 pid;
878  const char *channel;
879  const char *payload;
880 
881  pid = pq_getmsgint(msg, 4);
882  channel = pq_getmsgrawstring(msg);
883  payload = pq_getmsgrawstring(msg);
884  pq_endmessage(msg);
885 
886  NotifyMyFrontEnd(channel, payload, pid);
887 
888  break;
889  }
890 
891  case 'X': /* Terminate, indicating clean exit */
892  {
894  pcxt->worker[i].error_mqh = NULL;
895  break;
896  }
897 
898  default:
899  {
900  elog(ERROR, "unrecognized message type received from parallel worker: %c (message length %d bytes)",
901  msgtype, msg->len);
902  }
903  }
904 }
void shm_mq_detach(shm_mq_handle *mqh)
Definition: shm_mq.c:775
char * pstrdup(const char *in)
Definition: mcxt.c:1076
char * psprintf(const char *fmt,...)
Definition: psprintf.c:46
#define Min(x, y)
Definition: c.h:795
const char * pq_getmsgrawstring(StringInfo msg)
Definition: pqformat.c:650
signed int int32
Definition: c.h:246
ErrorContextCallback * error_context_stack
Definition: elog.c:88
ParallelWorkerInfo * worker
Definition: parallel.h:45
#define ERROR
Definition: elog.h:43
void pq_parse_errornotice(StringInfo msg, ErrorData *edata)
Definition: pqmq.c:215
shm_mq_handle * error_mqh
Definition: parallel.h:28
void ThrowErrorData(ErrorData *edata)
Definition: elog.c:1612
int elevel
Definition: elog.h:331
int pq_getmsgbyte(StringInfo msg)
Definition: pqformat.c:432
int force_parallel_mode
Definition: planner.c:63
char * context
Definition: elog.h:347
ErrorContextCallback * error_context_stack
Definition: parallel.h:40
void pq_endmessage(StringInfo buf)
Definition: pqformat.c:344
int i
unsigned int pq_getmsgint(StringInfo msg, int b)
Definition: pqformat.c:448
#define elog
Definition: elog.h:219
void pq_getmsgend(StringInfo msg)
Definition: pqformat.c:677
#define _(x)
Definition: elog.c:84
void NotifyMyFrontEnd(const char *channel, const char *payload, int32 srcPid)
Definition: async.c:2077
void HandleParallelMessageInterrupt ( void  )

Definition at line 710 of file parallel.c.

References InterruptPending, MyLatch, ParallelMessagePending, and SetLatch().

Referenced by procsignal_sigusr1_handler().

711 {
712  InterruptPending = true;
713  ParallelMessagePending = true;
714  SetLatch(MyLatch);
715 }
volatile bool ParallelMessagePending
Definition: parallel.c:101
volatile bool InterruptPending
Definition: globals.c:29
void SetLatch(volatile Latch *latch)
Definition: latch.c:414
struct Latch * MyLatch
Definition: globals.c:52
void HandleParallelMessages ( void  )

Definition at line 721 of file parallel.c.

References ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate(), appendBinaryStringInfo(), dlist_iter::cur, StringInfoData::data, dlist_container, dlist_foreach, ereport, errcode(), errmsg(), ERROR, ParallelWorkerInfo::error_mqh, HandleParallelMessage(), HOLD_INTERRUPTS, i, initStringInfo(), MemoryContextReset(), MemoryContextSwitchTo(), ParallelContext::nworkers_launched, ParallelMessagePending, pfree(), RESUME_INTERRUPTS, shm_mq_receive(), SHM_MQ_SUCCESS, SHM_MQ_WOULD_BLOCK, TopMemoryContext, and ParallelContext::worker.

Referenced by ProcessInterrupts().

722 {
723  dlist_iter iter;
724  MemoryContext oldcontext;
725 
726  static MemoryContext hpm_context = NULL;
727 
728  /*
729  * This is invoked from ProcessInterrupts(), and since some of the
730  * functions it calls contain CHECK_FOR_INTERRUPTS(), there is a potential
731  * for recursive calls if more signals are received while this runs. It's
732  * unclear that recursive entry would be safe, and it doesn't seem useful
733  * even if it is safe, so let's block interrupts until done.
734  */
735  HOLD_INTERRUPTS();
736 
737  /*
738  * Moreover, CurrentMemoryContext might be pointing almost anywhere. We
739  * don't want to risk leaking data into long-lived contexts, so let's do
740  * our work here in a private context that we can reset on each use.
741  */
742  if (hpm_context == NULL) /* first time through? */
744  "HandleParallelMessages",
746  else
747  MemoryContextReset(hpm_context);
748 
749  oldcontext = MemoryContextSwitchTo(hpm_context);
750 
751  /* OK to process messages. Reset the flag saying there are more to do. */
752  ParallelMessagePending = false;
753 
754  dlist_foreach(iter, &pcxt_list)
755  {
756  ParallelContext *pcxt;
757  int i;
758 
759  pcxt = dlist_container(ParallelContext, node, iter.cur);
760  if (pcxt->worker == NULL)
761  continue;
762 
763  for (i = 0; i < pcxt->nworkers_launched; ++i)
764  {
765  /*
766  * Read as many messages as we can from each worker, but stop when
767  * either (1) the worker's error queue goes away, which can happen
768  * if we receive a Terminate message from the worker; or (2) no
769  * more messages can be read from the worker without blocking.
770  */
771  while (pcxt->worker[i].error_mqh != NULL)
772  {
773  shm_mq_result res;
774  Size nbytes;
775  void *data;
776 
777  res = shm_mq_receive(pcxt->worker[i].error_mqh, &nbytes,
778  &data, true);
779  if (res == SHM_MQ_WOULD_BLOCK)
780  break;
781  else if (res == SHM_MQ_SUCCESS)
782  {
783  StringInfoData msg;
784 
785  initStringInfo(&msg);
786  appendBinaryStringInfo(&msg, data, nbytes);
787  HandleParallelMessage(pcxt, i, &msg);
788  pfree(msg.data);
789  }
790  else
791  ereport(ERROR,
792  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
793  errmsg("lost connection to parallel worker")));
794  }
795  }
796  }
797 
798  MemoryContextSwitchTo(oldcontext);
799 
800  /* Might as well clear the context on our way out */
801  MemoryContextReset(hpm_context);
802 
804 }
#define dlist_foreach(iter, lhead)
Definition: ilist.h:507
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
int errcode(int sqlerrcode)
Definition: elog.c:575
void MemoryContextReset(MemoryContext context)
Definition: mcxt.c:135
#define RESUME_INTERRUPTS()
Definition: miscadmin.h:117
volatile bool ParallelMessagePending
Definition: parallel.c:101
#define dlist_container(type, membername, ptr)
Definition: ilist.h:477
ParallelWorkerInfo * worker
Definition: parallel.h:45
void pfree(void *pointer)
Definition: mcxt.c:949
#define ERROR
Definition: elog.h:43
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:165
static void HandleParallelMessage(ParallelContext *pcxt, int i, StringInfo msg)
Definition: parallel.c:810
shm_mq_handle * error_mqh
Definition: parallel.h:28
int nworkers_launched
Definition: parallel.h:37
#define ereport(elevel, rest)
Definition: elog.h:122
MemoryContext TopMemoryContext
Definition: mcxt.c:43
void initStringInfo(StringInfo str)
Definition: stringinfo.c:46
MemoryContext AllocSetContextCreate(MemoryContext parent, const char *name, Size minContextSize, Size initBlockSize, Size maxBlockSize)
Definition: aset.c:322
dlist_node * cur
Definition: ilist.h:161
shm_mq_result
Definition: shm_mq.h:36
size_t Size
Definition: c.h:350
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define HOLD_INTERRUPTS()
Definition: miscadmin.h:115
int i
static dlist_head pcxt_list
Definition: parallel.c:110
shm_mq_result shm_mq_receive(shm_mq_handle *mqh, Size *nbytesp, void **datap, bool nowait)
Definition: shm_mq.c:522
void appendBinaryStringInfo(StringInfo str, const char *data, int datalen)
Definition: stringinfo.c:208
void InitializeParallelDSM ( ParallelContext pcxt)

Definition at line 192 of file parallel.c.

References FixedParallelState::authenticated_user_id, BUFFERALIGN, FixedParallelState::current_user_id, FixedParallelState::database_id, dsm_create(), DSM_CREATE_NULL_IF_MAXSEGMENTS, DSM_HANDLE_INVALID, dsm_segment_address(), ParallelWorkerInfo::error_mqh, EstimateComboCIDStateSpace(), EstimateGUCStateSpace(), EstimateLibraryStateSpace(), EstimateSnapshotSpace(), EstimateTransactionStateSpace(), ParallelContext::estimator, ParallelContext::function_name, GetActiveSnapshot(), GetAuthenticatedUserId(), GetSessionDsmHandle(), GetTempNamespaceState(), GetTransactionSnapshot(), GetUserIdAndSecContext(), i, FixedParallelState::last_xlog_end, ParallelContext::library_name, MemoryContextAlloc(), MemoryContextSwitchTo(), mul_size(), FixedParallelState::mutex, MyBackendId, MyDatabaseId, MyProc, MyProcPid, ParallelContext::nworkers, palloc0(), PARALLEL_ERROR_QUEUE_SIZE, PARALLEL_KEY_ACTIVE_SNAPSHOT, PARALLEL_KEY_COMBO_CID, PARALLEL_KEY_ENTRYPOINT, PARALLEL_KEY_ERROR_QUEUE, PARALLEL_KEY_FIXED, PARALLEL_KEY_GUC, PARALLEL_KEY_LIBRARY, PARALLEL_KEY_SESSION_DSM, PARALLEL_KEY_TRANSACTION_SNAPSHOT, PARALLEL_KEY_TRANSACTION_STATE, PARALLEL_MAGIC, FixedParallelState::parallel_master_backend_id, FixedParallelState::parallel_master_pgproc, FixedParallelState::parallel_master_pid, ParallelContext::private_memory, FixedParallelState::sec_context, ParallelContext::seg, SerializeComboCIDState(), SerializeGUCState(), SerializeLibraryState(), SerializeSnapshot(), SerializeTransactionState(), shm_mq_attach(), shm_mq_create(), shm_mq_set_receiver(), shm_toc_allocate(), shm_toc_create(), shm_toc_estimate(), shm_toc_estimate_chunk, shm_toc_estimate_keys, shm_toc_insert(), SpinLockInit, StaticAssertStmt, FixedParallelState::temp_namespace_id, FixedParallelState::temp_toast_namespace_id, ParallelContext::toc, TopMemoryContext, TopTransactionContext, and ParallelContext::worker.

Referenced by ExecInitParallelPlan().

193 {
194  MemoryContext oldcontext;
195  Size library_len = 0;
196  Size guc_len = 0;
197  Size combocidlen = 0;
198  Size tsnaplen = 0;
199  Size asnaplen = 0;
200  Size tstatelen = 0;
201  Size segsize = 0;
202  int i;
203  FixedParallelState *fps;
204  dsm_handle session_dsm_handle = DSM_HANDLE_INVALID;
205  Snapshot transaction_snapshot = GetTransactionSnapshot();
206  Snapshot active_snapshot = GetActiveSnapshot();
207 
208  /* We might be running in a very short-lived memory context. */
210 
211  /* Allow space to store the fixed-size parallel state. */
213  shm_toc_estimate_keys(&pcxt->estimator, 1);
214 
215  /*
216  * Normally, the user will have requested at least one worker process, but
217  * if by chance they have not, we can skip a bunch of things here.
218  */
219  if (pcxt->nworkers > 0)
220  {
221  /* Get (or create) the per-session DSM segment's handle. */
222  session_dsm_handle = GetSessionDsmHandle();
223 
224  /*
225  * If we weren't able to create a per-session DSM segment, then we can
226  * continue but we can't safely launch any workers because their
227  * record typmods would be incompatible so they couldn't exchange
228  * tuples.
229  */
230  if (session_dsm_handle == DSM_HANDLE_INVALID)
231  pcxt->nworkers = 0;
232  }
233 
234  if (pcxt->nworkers > 0)
235  {
236  /* Estimate space for various kinds of state sharing. */
237  library_len = EstimateLibraryStateSpace();
238  shm_toc_estimate_chunk(&pcxt->estimator, library_len);
239  guc_len = EstimateGUCStateSpace();
240  shm_toc_estimate_chunk(&pcxt->estimator, guc_len);
241  combocidlen = EstimateComboCIDStateSpace();
242  shm_toc_estimate_chunk(&pcxt->estimator, combocidlen);
243  tsnaplen = EstimateSnapshotSpace(transaction_snapshot);
244  shm_toc_estimate_chunk(&pcxt->estimator, tsnaplen);
245  asnaplen = EstimateSnapshotSpace(active_snapshot);
246  shm_toc_estimate_chunk(&pcxt->estimator, asnaplen);
247  tstatelen = EstimateTransactionStateSpace();
248  shm_toc_estimate_chunk(&pcxt->estimator, tstatelen);
250  /* If you add more chunks here, you probably need to add keys. */
251  shm_toc_estimate_keys(&pcxt->estimator, 7);
252 
253  /* Estimate space need for error queues. */
256  "parallel error queue size not buffer-aligned");
259  pcxt->nworkers));
260  shm_toc_estimate_keys(&pcxt->estimator, 1);
261 
262  /* Estimate how much we'll need for the entrypoint info. */
263  shm_toc_estimate_chunk(&pcxt->estimator, strlen(pcxt->library_name) +
264  strlen(pcxt->function_name) + 2);
265  shm_toc_estimate_keys(&pcxt->estimator, 1);
266  }
267 
268  /*
269  * Create DSM and initialize with new table of contents. But if the user
270  * didn't request any workers, then don't bother creating a dynamic shared
271  * memory segment; instead, just use backend-private memory.
272  *
273  * Also, if we can't create a dynamic shared memory segment because the
274  * maximum number of segments have already been created, then fall back to
275  * backend-private memory, and plan not to use any workers. We hope this
276  * won't happen very often, but it's better to abandon the use of
277  * parallelism than to fail outright.
278  */
279  segsize = shm_toc_estimate(&pcxt->estimator);
280  if (pcxt->nworkers > 0)
282  if (pcxt->seg != NULL)
284  dsm_segment_address(pcxt->seg),
285  segsize);
286  else
287  {
288  pcxt->nworkers = 0;
291  segsize);
292  }
293 
294  /* Initialize fixed-size state in shared memory. */
295  fps = (FixedParallelState *)
296  shm_toc_allocate(pcxt->toc, sizeof(FixedParallelState));
297  fps->database_id = MyDatabaseId;
305  SpinLockInit(&fps->mutex);
306  fps->last_xlog_end = 0;
308 
309  /* We can skip the rest of this if we're not budgeting for any workers. */
310  if (pcxt->nworkers > 0)
311  {
312  char *libraryspace;
313  char *gucspace;
314  char *combocidspace;
315  char *tsnapspace;
316  char *asnapspace;
317  char *tstatespace;
318  char *error_queue_space;
319  char *session_dsm_handle_space;
320  char *entrypointstate;
321  Size lnamelen;
322 
323  /* Serialize shared libraries we have loaded. */
324  libraryspace = shm_toc_allocate(pcxt->toc, library_len);
325  SerializeLibraryState(library_len, libraryspace);
326  shm_toc_insert(pcxt->toc, PARALLEL_KEY_LIBRARY, libraryspace);
327 
328  /* Serialize GUC settings. */
329  gucspace = shm_toc_allocate(pcxt->toc, guc_len);
330  SerializeGUCState(guc_len, gucspace);
331  shm_toc_insert(pcxt->toc, PARALLEL_KEY_GUC, gucspace);
332 
333  /* Serialize combo CID state. */
334  combocidspace = shm_toc_allocate(pcxt->toc, combocidlen);
335  SerializeComboCIDState(combocidlen, combocidspace);
336  shm_toc_insert(pcxt->toc, PARALLEL_KEY_COMBO_CID, combocidspace);
337 
338  /* Serialize transaction snapshot and active snapshot. */
339  tsnapspace = shm_toc_allocate(pcxt->toc, tsnaplen);
340  SerializeSnapshot(transaction_snapshot, tsnapspace);
342  tsnapspace);
343  asnapspace = shm_toc_allocate(pcxt->toc, asnaplen);
344  SerializeSnapshot(active_snapshot, asnapspace);
345  shm_toc_insert(pcxt->toc, PARALLEL_KEY_ACTIVE_SNAPSHOT, asnapspace);
346 
347  /* Provide the handle for per-session segment. */
348  session_dsm_handle_space = shm_toc_allocate(pcxt->toc,
349  sizeof(dsm_handle));
350  *(dsm_handle *) session_dsm_handle_space = session_dsm_handle;
352  session_dsm_handle_space);
353 
354  /* Serialize transaction state. */
355  tstatespace = shm_toc_allocate(pcxt->toc, tstatelen);
356  SerializeTransactionState(tstatelen, tstatespace);
358 
359  /* Allocate space for worker information. */
360  pcxt->worker = palloc0(sizeof(ParallelWorkerInfo) * pcxt->nworkers);
361 
362  /*
363  * Establish error queues in dynamic shared memory.
364  *
365  * These queues should be used only for transmitting ErrorResponse,
366  * NoticeResponse, and NotifyResponse protocol messages. Tuple data
367  * should be transmitted via separate (possibly larger?) queues.
368  */
369  error_queue_space =
370  shm_toc_allocate(pcxt->toc,
372  pcxt->nworkers));
373  for (i = 0; i < pcxt->nworkers; ++i)
374  {
375  char *start;
376  shm_mq *mq;
377 
378  start = error_queue_space + i * PARALLEL_ERROR_QUEUE_SIZE;
379  mq = shm_mq_create(start, PARALLEL_ERROR_QUEUE_SIZE);
381  pcxt->worker[i].error_mqh = shm_mq_attach(mq, pcxt->seg, NULL);
382  }
383  shm_toc_insert(pcxt->toc, PARALLEL_KEY_ERROR_QUEUE, error_queue_space);
384 
385  /*
386  * Serialize entrypoint information. It's unsafe to pass function
387  * pointers across processes, as the function pointer may be different
388  * in each process in EXEC_BACKEND builds, so we always pass library
389  * and function name. (We use library name "postgres" for functions
390  * in the core backend.)
391  */
392  lnamelen = strlen(pcxt->library_name);
393  entrypointstate = shm_toc_allocate(pcxt->toc, lnamelen +
394  strlen(pcxt->function_name) + 2);
395  strcpy(entrypointstate, pcxt->library_name);
396  strcpy(entrypointstate + lnamelen + 1, pcxt->function_name);
397  shm_toc_insert(pcxt->toc, PARALLEL_KEY_ENTRYPOINT, entrypointstate);
398  }
399 
400  /* Restore previous memory context. */
401  MemoryContextSwitchTo(oldcontext);
402 }
#define PARALLEL_ERROR_QUEUE_SIZE
Definition: parallel.c:50
shm_toc * shm_toc_create(uint64 magic, void *address, Size nbytes)
Definition: shm_toc.c:40
int MyProcPid
Definition: globals.c:39
BackendId MyBackendId
Definition: globals.c:73
MemoryContext TopTransactionContext
Definition: mcxt.c:48
uint32 dsm_handle
Definition: dsm_impl.h:55
PGPROC * MyProc
Definition: proc.c:67
dsm_segment * seg
Definition: parallel.h:42
shm_toc_estimator estimator
Definition: parallel.h:41
#define SpinLockInit(lock)
Definition: spin.h:60
void GetTempNamespaceState(Oid *tempNamespaceId, Oid *tempToastNamespaceId)
Definition: namespace.c:3234
Oid authenticated_user_id
Definition: parallel.c:76
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
Snapshot GetActiveSnapshot(void)
Definition: snapmgr.c:839
PGPROC * parallel_master_pgproc
Definition: parallel.c:81
Oid temp_toast_namespace_id
Definition: parallel.c:79
Size shm_toc_estimate(shm_toc_estimator *e)
Definition: shm_toc.c:263
void SerializeTransactionState(Size maxsize, char *start_address)
Definition: xact.c:5001
#define shm_toc_estimate_chunk(e, sz)
Definition: shm_toc.h:51
Snapshot GetTransactionSnapshot(void)
Definition: snapmgr.c:304
#define DSM_HANDLE_INVALID
Definition: dsm.h:23
#define StaticAssertStmt(condition, errmessage)
Definition: c.h:746
ParallelWorkerInfo * worker
Definition: parallel.h:45
void SerializeLibraryState(Size maxsize, char *start_address)
Definition: dfmgr.c:728
Oid GetAuthenticatedUserId(void)
Definition: miscinit.c:343
#define PARALLEL_KEY_TRANSACTION_SNAPSHOT
Definition: parallel.c:65
char * function_name
Definition: parallel.h:39
void SerializeSnapshot(Snapshot snapshot, char *start_address)
Definition: snapmgr.c:2062
shm_mq * shm_mq_create(void *address, Size size)
Definition: shm_mq.c:170
#define PARALLEL_KEY_FIXED
Definition: parallel.c:60
#define PARALLEL_KEY_ERROR_QUEUE
Definition: parallel.c:61
#define DSM_CREATE_NULL_IF_MAXSEGMENTS
Definition: dsm.h:20
void GetUserIdAndSecContext(Oid *userid, int *sec_context)
Definition: miscinit.c:389
shm_mq_handle * error_mqh
Definition: parallel.h:28
#define PARALLEL_KEY_GUC
Definition: parallel.c:63
Size EstimateGUCStateSpace(void)
Definition: guc.c:9103
Size EstimateComboCIDStateSpace(void)
Definition: combocid.c:299
XLogRecPtr last_xlog_end
Definition: parallel.c:89
MemoryContext TopMemoryContext
Definition: mcxt.c:43
Size EstimateSnapshotSpace(Snapshot snap)
Definition: snapmgr.c:2038
Size mul_size(Size s1, Size s2)
Definition: shmem.c:492
void * palloc0(Size size)
Definition: mcxt.c:877
dsm_segment * dsm_create(Size size, int flags)
Definition: dsm.c:465
Oid MyDatabaseId
Definition: globals.c:77
pid_t parallel_master_pid
Definition: parallel.c:82
Size EstimateLibraryStateSpace(void)
Definition: dfmgr.c:711
#define PARALLEL_MAGIC
Definition: parallel.c:53
char * library_name
Definition: parallel.h:38
BackendId parallel_master_backend_id
Definition: parallel.c:83
void * dsm_segment_address(dsm_segment *seg)
Definition: dsm.c:1000
Size EstimateTransactionStateSpace(void)
Definition: xact.c:4968
size_t Size
Definition: c.h:350
#define shm_toc_estimate_keys(e, cnt)
Definition: shm_toc.h:53
void * shm_toc_allocate(shm_toc *toc, Size nbytes)
Definition: shm_toc.c:88
shm_mq_handle * shm_mq_attach(shm_mq *mq, dsm_segment *seg, BackgroundWorkerHandle *handle)
Definition: shm_mq.c:287
#define PARALLEL_KEY_TRANSACTION_STATE
Definition: parallel.c:67
void shm_toc_insert(shm_toc *toc, uint64 key, void *address)
Definition: shm_toc.c:171
void * MemoryContextAlloc(MemoryContext context, Size size)
Definition: mcxt.c:706
int i
Definition: shm_mq.c:69
#define PARALLEL_KEY_SESSION_DSM
Definition: parallel.c:69
#define BUFFERALIGN(LEN)
Definition: c.h:578
void shm_mq_set_receiver(shm_mq *mq, PGPROC *proc)
Definition: shm_mq.c:199
dsm_handle GetSessionDsmHandle(void)
Definition: session.c:70
#define PARALLEL_KEY_ENTRYPOINT
Definition: parallel.c:68
#define PARALLEL_KEY_COMBO_CID
Definition: parallel.c:64
void SerializeGUCState(Size maxsize, char *start_address)
Definition: guc.c:9250
#define PARALLEL_KEY_ACTIVE_SNAPSHOT
Definition: parallel.c:66
void SerializeComboCIDState(Size maxsize, char *start_address)
Definition: combocid.c:318
#define PARALLEL_KEY_LIBRARY
Definition: parallel.c:62
shm_toc * toc
Definition: parallel.h:44
void * private_memory
Definition: parallel.h:43
void LaunchParallelWorkers ( ParallelContext pcxt)

Definition at line 446 of file parallel.c.

References Assert, BecomeLockGroupLeader(), BackgroundWorker::bgw_extra, BackgroundWorker::bgw_flags, BackgroundWorker::bgw_function_name, BackgroundWorker::bgw_library_name, BackgroundWorker::bgw_main_arg, BGW_MAXLEN, BackgroundWorker::bgw_name, BGW_NEVER_RESTART, BackgroundWorker::bgw_notify_pid, BackgroundWorker::bgw_restart_time, BackgroundWorker::bgw_start_time, ParallelWorkerInfo::bgwhandle, BGWORKER_BACKEND_DATABASE_CONNECTION, BGWORKER_CLASS_PARALLEL, BGWORKER_SHMEM_ACCESS, BgWorkerStart_ConsistentState, dsm_segment_handle(), ParallelWorkerInfo::error_mqh, i, MemoryContextSwitchTo(), MyProcPid, ParallelContext::nworkers, ParallelContext::nworkers_launched, RegisterDynamicBackgroundWorker(), ParallelContext::seg, shm_mq_detach(), shm_mq_set_handle(), snprintf(), TopTransactionContext, UInt32GetDatum, and ParallelContext::worker.

Referenced by ExecGather(), and ExecGatherMerge().

447 {
448  MemoryContext oldcontext;
449  BackgroundWorker worker;
450  int i;
451  bool any_registrations_failed = false;
452 
453  /* Skip this if we have no workers. */
454  if (pcxt->nworkers == 0)
455  return;
456 
457  /* We need to be a lock group leader. */
459 
460  /* If we do have workers, we'd better have a DSM segment. */
461  Assert(pcxt->seg != NULL);
462 
463  /* We might be running in a short-lived memory context. */
465 
466  /* Configure a worker. */
467  memset(&worker, 0, sizeof(worker));
468  snprintf(worker.bgw_name, BGW_MAXLEN, "parallel worker for PID %d",
469  MyProcPid);
470  worker.bgw_flags =
475  sprintf(worker.bgw_library_name, "postgres");
476  sprintf(worker.bgw_function_name, "ParallelWorkerMain");
478  worker.bgw_notify_pid = MyProcPid;
479 
480  /*
481  * Start workers.
482  *
483  * The caller must be able to tolerate ending up with fewer workers than
484  * expected, so there is no need to throw an error here if registration
485  * fails. It wouldn't help much anyway, because registering the worker in
486  * no way guarantees that it will start up and initialize successfully.
487  */
488  for (i = 0; i < pcxt->nworkers; ++i)
489  {
490  memcpy(worker.bgw_extra, &i, sizeof(int));
491  if (!any_registrations_failed &&
493  &pcxt->worker[i].bgwhandle))
494  {
496  pcxt->worker[i].bgwhandle);
497  pcxt->nworkers_launched++;
498  }
499  else
500  {
501  /*
502  * If we weren't able to register the worker, then we've bumped up
503  * against the max_worker_processes limit, and future
504  * registrations will probably fail too, so arrange to skip them.
505  * But we still have to execute this code for the remaining slots
506  * to make sure that we forget about the error queues we budgeted
507  * for those workers. Otherwise, we'll wait for them to start,
508  * but they never will.
509  */
510  any_registrations_failed = true;
511  pcxt->worker[i].bgwhandle = NULL;
512  shm_mq_detach(pcxt->worker[i].error_mqh);
513  pcxt->worker[i].error_mqh = NULL;
514  }
515  }
516 
517  /* Restore previous memory context. */
518  MemoryContextSwitchTo(oldcontext);
519 }
char bgw_extra[BGW_EXTRALEN]
Definition: bgworker.h:97
int MyProcPid
Definition: globals.c:39
MemoryContext TopTransactionContext
Definition: mcxt.c:48
void shm_mq_detach(shm_mq_handle *mqh)
Definition: shm_mq.c:775
dsm_segment * seg
Definition: parallel.h:42
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
dsm_handle dsm_segment_handle(dsm_segment *seg)
Definition: dsm.c:1028
int bgw_restart_time
Definition: bgworker.h:93
#define BGWORKER_CLASS_PARALLEL
Definition: bgworker.h:67
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
#define BGWORKER_SHMEM_ACCESS
Definition: bgworker.h:52
char bgw_function_name[BGW_MAXLEN]
Definition: bgworker.h:95
ParallelWorkerInfo * worker
Definition: parallel.h:45
Datum bgw_main_arg
Definition: bgworker.h:96
shm_mq_handle * error_mqh
Definition: parallel.h:28
BackgroundWorkerHandle * bgwhandle
Definition: parallel.h:27
#define BGW_NEVER_RESTART
Definition: bgworker.h:84
#define UInt32GetDatum(X)
Definition: postgres.h:499
int nworkers_launched
Definition: parallel.h:37
void BecomeLockGroupLeader(void)
Definition: proc.c:1824
void shm_mq_set_handle(shm_mq_handle *mqh, BackgroundWorkerHandle *handle)
Definition: shm_mq.c:315
char bgw_name[BGW_MAXLEN]
Definition: bgworker.h:90
#define Assert(condition)
Definition: c.h:664
#define BGWORKER_BACKEND_DATABASE_CONNECTION
Definition: bgworker.h:59
#define BGW_MAXLEN
Definition: bgworker.h:85
BgWorkerStartTime bgw_start_time
Definition: bgworker.h:92
bool RegisterDynamicBackgroundWorker(BackgroundWorker *worker, BackgroundWorkerHandle **handle)
Definition: bgworker.c:933
pid_t bgw_notify_pid
Definition: bgworker.h:98
int i
char bgw_library_name[BGW_MAXLEN]
Definition: bgworker.h:94
static parallel_worker_main_type LookupParallelWorkerFunction ( const char *  libraryname,
const char *  funcname 
)
static

Definition at line 1190 of file parallel.c.

References elog, ERROR, fn_addr, fn_name, i, InternalParallelWorkers, lengthof, and load_external_function().

Referenced by ParallelWorkerMain().

1191 {
1192  /*
1193  * If the function is to be loaded from postgres itself, search the
1194  * InternalParallelWorkers array.
1195  */
1196  if (strcmp(libraryname, "postgres") == 0)
1197  {
1198  int i;
1199 
1200  for (i = 0; i < lengthof(InternalParallelWorkers); i++)
1201  {
1202  if (strcmp(InternalParallelWorkers[i].fn_name, funcname) == 0)
1203  return InternalParallelWorkers[i].fn_addr;
1204  }
1205 
1206  /* We can only reach this by programming error. */
1207  elog(ERROR, "internal function \"%s\" not found", funcname);
1208  }
1209 
1210  /* Otherwise load from external library. */
1211  return (parallel_worker_main_type)
1212  load_external_function(libraryname, funcname, true, NULL);
1213 }
static const struct @21 InternalParallelWorkers[]
#define lengthof(array)
Definition: c.h:556
parallel_worker_main_type fn_addr
Definition: parallel.c:119
#define ERROR
Definition: elog.h:43
PGFunction load_external_function(const char *filename, const char *funcname, bool signalNotFound, void **filehandle)
Definition: dfmgr.c:94
const char * fn_name
Definition: parallel.c:118
int i
#define elog
Definition: elog.h:219
void(* parallel_worker_main_type)(dsm_segment *seg, shm_toc *toc)
Definition: parallel.h:23
bool ParallelContextActive ( void  )

Definition at line 697 of file parallel.c.

References dlist_is_empty().

Referenced by ExitParallelMode().

698 {
699  return !dlist_is_empty(&pcxt_list);
700 }
static bool dlist_is_empty(dlist_head *head)
Definition: ilist.h:289
static dlist_head pcxt_list
Definition: parallel.c:110
void ParallelWorkerMain ( Datum  main_arg)

Definition at line 951 of file parallel.c.

References ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate(), Assert, AttachSession(), FixedParallelState::authenticated_user_id, BackgroundWorkerInitializeConnectionByOid(), BackgroundWorkerUnblockSignals(), BecomeLockGroupMember(), BackgroundWorker::bgw_extra, CommitTransactionCommand(), FixedParallelState::current_user_id, CurrentMemoryContext, CurrentResourceOwner, FixedParallelState::database_id, DatumGetUInt32, DetachSession(), die(), dsm_attach(), dsm_segment_address(), EndParallelWorkerTransaction(), EnterParallelMode(), ereport, errcode(), errmsg(), ERROR, ExitParallelMode(), GetDatabaseEncoding(), InitializingParallelWorker, InvalidateSystemCaches(), LookupParallelWorkerFunction(), MyBgworkerEntry, MyCancelKey, MyProc, MyProcPid, PARALLEL_ERROR_QUEUE_SIZE, PARALLEL_KEY_ACTIVE_SNAPSHOT, PARALLEL_KEY_COMBO_CID, PARALLEL_KEY_ENTRYPOINT, PARALLEL_KEY_ERROR_QUEUE, PARALLEL_KEY_FIXED, PARALLEL_KEY_GUC, PARALLEL_KEY_LIBRARY, PARALLEL_KEY_SESSION_DSM, PARALLEL_KEY_TRANSACTION_SNAPSHOT, PARALLEL_KEY_TRANSACTION_STATE, PARALLEL_MAGIC, FixedParallelState::parallel_master_backend_id, FixedParallelState::parallel_master_pgproc, FixedParallelState::parallel_master_pid, ParallelMasterBackendId, ParallelWorkerNumber, PopActiveSnapshot(), pq_beginmessage(), pq_endmessage(), pq_putmessage, pq_redirect_to_shm_mq(), pq_sendint(), pq_set_parallel_master(), pqsignal(), PushActiveSnapshot(), ResourceOwnerCreate(), RestoreComboCIDState(), RestoreGUCState(), RestoreLibraryState(), RestoreSnapshot(), RestoreTransactionSnapshot(), FixedParallelState::sec_context, SetClientEncoding(), SetTempNamespaceState(), SetUserIdAndSecContext(), shm_mq_attach(), shm_mq_set_sender(), shm_toc_attach(), shm_toc_lookup(), StartParallelWorkerTransaction(), StartTransactionCommand(), FixedParallelState::temp_namespace_id, FixedParallelState::temp_toast_namespace_id, and TopMemoryContext.

952 {
953  dsm_segment *seg;
954  shm_toc *toc;
955  FixedParallelState *fps;
956  char *error_queue_space;
957  shm_mq *mq;
958  shm_mq_handle *mqh;
959  char *libraryspace;
960  char *entrypointstate;
961  char *library_name;
962  char *function_name;
964  char *gucspace;
965  char *combocidspace;
966  char *tsnapspace;
967  char *asnapspace;
968  char *tstatespace;
969  StringInfoData msgbuf;
970  char *session_dsm_handle_space;
971 
972  /* Set flag to indicate that we're initializing a parallel worker. */
974 
975  /* Establish signal handlers. */
976  pqsignal(SIGTERM, die);
978 
979  /* Determine and set our parallel worker number. */
981  memcpy(&ParallelWorkerNumber, MyBgworkerEntry->bgw_extra, sizeof(int));
982 
983  /* Set up a memory context and resource owner. */
984  Assert(CurrentResourceOwner == NULL);
985  CurrentResourceOwner = ResourceOwnerCreate(NULL, "parallel toplevel");
987  "Parallel worker",
989 
990  /*
991  * Now that we have a resource owner, we can attach to the dynamic shared
992  * memory segment and read the table of contents.
993  */
994  seg = dsm_attach(DatumGetUInt32(main_arg));
995  if (seg == NULL)
996  ereport(ERROR,
997  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
998  errmsg("could not map dynamic shared memory segment")));
1000  if (toc == NULL)
1001  ereport(ERROR,
1002  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1003  errmsg("invalid magic number in dynamic shared memory segment")));
1004 
1005  /* Look up fixed parallel state. */
1006  fps = shm_toc_lookup(toc, PARALLEL_KEY_FIXED, false);
1007  MyFixedParallelState = fps;
1008 
1009  /*
1010  * Now that we have a worker number, we can find and attach to the error
1011  * queue provided for us. That's good, because until we do that, any
1012  * errors that happen here will not be reported back to the process that
1013  * requested that this worker be launched.
1014  */
1015  error_queue_space = shm_toc_lookup(toc, PARALLEL_KEY_ERROR_QUEUE, false);
1016  mq = (shm_mq *) (error_queue_space +
1019  mqh = shm_mq_attach(mq, seg, NULL);
1020  pq_redirect_to_shm_mq(seg, mqh);
1023 
1024  /*
1025  * Send a BackendKeyData message to the process that initiated parallelism
1026  * so that it has access to our PID before it receives any other messages
1027  * from us. Our cancel key is sent, too, since that's the way the
1028  * protocol message is defined, but it won't actually be used for anything
1029  * in this case.
1030  */
1031  pq_beginmessage(&msgbuf, 'K');
1032  pq_sendint(&msgbuf, (int32) MyProcPid, sizeof(int32));
1033  pq_sendint(&msgbuf, (int32) MyCancelKey, sizeof(int32));
1034  pq_endmessage(&msgbuf);
1035 
1036  /*
1037  * Hooray! Primary initialization is complete. Now, we need to set up our
1038  * backend-local state to match the original backend.
1039  */
1040 
1041  /*
1042  * Join locking group. We must do this before anything that could try to
1043  * acquire a heavyweight lock, because any heavyweight locks acquired to
1044  * this point could block either directly against the parallel group
1045  * leader or against some process which in turn waits for a lock that
1046  * conflicts with the parallel group leader, causing an undetected
1047  * deadlock. (If we can't join the lock group, the leader has gone away,
1048  * so just exit quietly.)
1049  */
1051  fps->parallel_master_pid))
1052  return;
1053 
1054  /*
1055  * Load libraries that were loaded by original backend. We want to do
1056  * this before restoring GUCs, because the libraries might define custom
1057  * variables.
1058  */
1059  libraryspace = shm_toc_lookup(toc, PARALLEL_KEY_LIBRARY, false);
1060  RestoreLibraryState(libraryspace);
1061 
1062  /*
1063  * Identify the entry point to be called. In theory this could result in
1064  * loading an additional library, though most likely the entry point is in
1065  * the core backend or in a library we just loaded.
1066  */
1067  entrypointstate = shm_toc_lookup(toc, PARALLEL_KEY_ENTRYPOINT, false);
1068  library_name = entrypointstate;
1069  function_name = entrypointstate + strlen(library_name) + 1;
1070 
1071  entrypt = LookupParallelWorkerFunction(library_name, function_name);
1072 
1073  /* Restore database connection. */
1075  fps->authenticated_user_id);
1076 
1077  /*
1078  * Set the client encoding to the database encoding, since that is what
1079  * the leader will expect.
1080  */
1082 
1083  /* Restore GUC values from launching backend. */
1084  gucspace = shm_toc_lookup(toc, PARALLEL_KEY_GUC, false);
1086  RestoreGUCState(gucspace);
1088 
1089  /* Crank up a transaction state appropriate to a parallel worker. */
1090  tstatespace = shm_toc_lookup(toc, PARALLEL_KEY_TRANSACTION_STATE, false);
1091  StartParallelWorkerTransaction(tstatespace);
1092 
1093  /* Restore combo CID state. */
1094  combocidspace = shm_toc_lookup(toc, PARALLEL_KEY_COMBO_CID, false);
1095  RestoreComboCIDState(combocidspace);
1096 
1097  /* Attach to the per-session DSM segment and contained objects. */
1098  session_dsm_handle_space =
1100  AttachSession(*(dsm_handle *) session_dsm_handle_space);
1101 
1102  /* Restore transaction snapshot. */
1103  tsnapspace = shm_toc_lookup(toc, PARALLEL_KEY_TRANSACTION_SNAPSHOT, false);
1105  fps->parallel_master_pgproc);
1106 
1107  /* Restore active snapshot. */
1108  asnapspace = shm_toc_lookup(toc, PARALLEL_KEY_ACTIVE_SNAPSHOT, false);
1109  PushActiveSnapshot(RestoreSnapshot(asnapspace));
1110 
1111  /*
1112  * We've changed which tuples we can see, and must therefore invalidate
1113  * system caches.
1114  */
1116 
1117  /* Restore user ID and security context. */
1119 
1120  /* Restore temp-namespace state to ensure search path matches leader's. */
1123 
1124  /* Set ParallelMasterBackendId so we know how to address temp relations. */
1126 
1127  /*
1128  * We've initialized all of our state now; nothing should change
1129  * hereafter.
1130  */
1133 
1134  /*
1135  * Time to do the real work: invoke the caller-supplied code.
1136  */
1137  entrypt(seg, toc);
1138 
1139  /* Must exit parallel mode to pop active snapshot. */
1140  ExitParallelMode();
1141 
1142  /* Must pop active snapshot so resowner.c doesn't complain. */
1144 
1145  /* Shut down the parallel-worker transaction. */
1147 
1148  /* Detach from the per-session DSM segment. */
1149  DetachSession();
1150 
1151  /* Report success. */
1152  pq_putmessage('X', NULL, 0);
1153 }
char bgw_extra[BGW_EXTRALEN]
Definition: bgworker.h:97
#define DatumGetUInt32(X)
Definition: postgres.h:492
#define PARALLEL_ERROR_QUEUE_SIZE
Definition: parallel.c:50
int MyProcPid
Definition: globals.c:39
Snapshot RestoreSnapshot(char *start_address)
Definition: snapmgr.c:2121
uint32 dsm_handle
Definition: dsm_impl.h:55
void SetUserIdAndSecContext(Oid userid, int sec_context)
Definition: miscinit.c:396
PGPROC * MyProc
Definition: proc.c:67
ResourceOwner CurrentResourceOwner
Definition: resowner.c:138
void CommitTransactionCommand(void)
Definition: xact.c:2752
void EndParallelWorkerTransaction(void)
Definition: xact.c:5092
void RestoreTransactionSnapshot(Snapshot snapshot, void *master_pgproc)
Definition: snapmgr.c:2185
dsm_segment * dsm_attach(dsm_handle h)
Definition: dsm.c:561
Oid authenticated_user_id
Definition: parallel.c:76
int errcode(int sqlerrcode)
Definition: elog.c:575
PGPROC * parallel_master_pgproc
Definition: parallel.c:81
Oid temp_toast_namespace_id
Definition: parallel.c:79
void DetachSession(void)
Definition: session.c:201
BackgroundWorker * MyBgworkerEntry
Definition: postmaster.c:190
bool BecomeLockGroupMember(PGPROC *leader, int pid)
Definition: proc.c:1854
void PopActiveSnapshot(void)
Definition: snapmgr.c:812
void InvalidateSystemCaches(void)
Definition: inval.c:641
void pq_beginmessage(StringInfo buf, char msgtype)
Definition: pqformat.c:88
void RestoreComboCIDState(char *comboCIDstate)
Definition: combocid.c:344
signed int int32
Definition: c.h:246
#define ERROR
Definition: elog.h:43
#define PARALLEL_KEY_TRANSACTION_SNAPSHOT
Definition: parallel.c:65
int32 MyCancelKey
Definition: globals.c:42
void ExitParallelMode(void)
Definition: xact.c:894
#define ALLOCSET_DEFAULT_SIZES
Definition: memutils.h:165
#define PARALLEL_KEY_FIXED
Definition: parallel.c:60
#define PARALLEL_KEY_ERROR_QUEUE
Definition: parallel.c:61
void SetTempNamespaceState(Oid tempNamespaceId, Oid tempToastNamespaceId)
Definition: namespace.c:3250
void PushActiveSnapshot(Snapshot snap)
Definition: snapmgr.c:733
#define PARALLEL_KEY_GUC
Definition: parallel.c:63
int SetClientEncoding(int encoding)
Definition: mbutils.c:212
int ParallelWorkerNumber
Definition: parallel.c:98
void AttachSession(dsm_handle handle)
Definition: session.c:155
MemoryContext CurrentMemoryContext
Definition: mcxt.c:37
void BackgroundWorkerInitializeConnectionByOid(Oid dboid, Oid useroid)
Definition: postmaster.c:5563
void shm_mq_set_sender(shm_mq *mq, PGPROC *proc)
Definition: shm_mq.c:218
#define ereport(elevel, rest)
Definition: elog.h:122
MemoryContext TopMemoryContext
Definition: mcxt.c:43
MemoryContext AllocSetContextCreate(MemoryContext parent, const char *name, Size minContextSize, Size initBlockSize, Size maxBlockSize)
Definition: aset.c:322
static parallel_worker_main_type LookupParallelWorkerFunction(const char *libraryname, const char *funcname)
Definition: parallel.c:1190
void RestoreLibraryState(char *start_address)
Definition: dfmgr.c:750
shm_toc * shm_toc_attach(uint64 magic, void *address)
Definition: shm_toc.c:64
int GetDatabaseEncoding(void)
Definition: mbutils.c:1015
pid_t parallel_master_pid
Definition: parallel.c:82
#define PARALLEL_MAGIC
Definition: parallel.c:53
void pq_redirect_to_shm_mq(dsm_segment *seg, shm_mq_handle *mqh)
Definition: pqmq.c:55
pqsigfunc pqsignal(int signum, pqsigfunc handler)
Definition: signal.c:168
BackendId parallel_master_backend_id
Definition: parallel.c:83
void * dsm_segment_address(dsm_segment *seg)
Definition: dsm.c:1000
#define Assert(condition)
Definition: c.h:664
BackendId ParallelMasterBackendId
Definition: globals.c:75
void StartParallelWorkerTransaction(char *tstatespace)
Definition: xact.c:5069
void StartTransactionCommand(void)
Definition: xact.c:2681
void EnterParallelMode(void)
Definition: xact.c:881
shm_mq_handle * shm_mq_attach(shm_mq *mq, dsm_segment *seg, BackgroundWorkerHandle *handle)
Definition: shm_mq.c:287
void pq_set_parallel_master(pid_t pid, BackendId backend_id)
Definition: pqmq.c:80
#define PARALLEL_KEY_TRANSACTION_STATE
Definition: parallel.c:67
int errmsg(const char *fmt,...)
Definition: elog.c:797
void pq_sendint(StringInfo buf, int i, int b)
Definition: pqformat.c:236
void pq_endmessage(StringInfo buf)
Definition: pqformat.c:344
static FixedParallelState * MyFixedParallelState
Definition: parallel.c:107
void die(SIGNAL_ARGS)
Definition: postgres.c:2644
bool InitializingParallelWorker
Definition: parallel.c:104
Definition: shm_mq.c:69
#define PARALLEL_KEY_SESSION_DSM
Definition: parallel.c:69
#define pq_putmessage(msgtype, s, len)
Definition: libpq.h:42
#define PARALLEL_KEY_ENTRYPOINT
Definition: parallel.c:68
#define PARALLEL_KEY_COMBO_CID
Definition: parallel.c:64
#define PARALLEL_KEY_ACTIVE_SNAPSHOT
Definition: parallel.c:66
void * shm_toc_lookup(shm_toc *toc, uint64 key, bool noError)
Definition: shm_toc.c:232
#define PARALLEL_KEY_LIBRARY
Definition: parallel.c:62
void RestoreGUCState(void *gucstate)
Definition: guc.c:9328
ResourceOwner ResourceOwnerCreate(ResourceOwner parent, const char *name)
Definition: resowner.c:416
void(* parallel_worker_main_type)(dsm_segment *seg, shm_toc *toc)
Definition: parallel.h:23
void BackgroundWorkerUnblockSignals(void)
Definition: postmaster.c:5592
void ParallelWorkerReportLastRecEnd ( XLogRecPtr  last_xlog_end)

Definition at line 1160 of file parallel.c.

References Assert, FixedParallelState::last_xlog_end, FixedParallelState::mutex, MyFixedParallelState, SpinLockAcquire, and SpinLockRelease.

Referenced by CommitTransaction().

1161 {
1163 
1164  Assert(fps != NULL);
1165  SpinLockAcquire(&fps->mutex);
1166  if (fps->last_xlog_end < last_xlog_end)
1167  fps->last_xlog_end = last_xlog_end;
1168  SpinLockRelease(&fps->mutex);
1169 }
#define SpinLockAcquire(lock)
Definition: spin.h:62
XLogRecPtr last_xlog_end
Definition: parallel.c:89
#define SpinLockRelease(lock)
Definition: spin.h:64
#define Assert(condition)
Definition: c.h:664
static FixedParallelState * MyFixedParallelState
Definition: parallel.c:107
void ReinitializeParallelDSM ( ParallelContext pcxt)

Definition at line 409 of file parallel.c.

References ParallelWorkerInfo::error_mqh, i, FixedParallelState::last_xlog_end, MyProc, ParallelContext::nworkers, ParallelContext::nworkers_launched, PARALLEL_ERROR_QUEUE_SIZE, PARALLEL_KEY_ERROR_QUEUE, PARALLEL_KEY_FIXED, ParallelContext::seg, shm_mq_attach(), shm_mq_create(), shm_mq_set_receiver(), shm_toc_lookup(), ParallelContext::toc, WaitForParallelWorkersToExit(), WaitForParallelWorkersToFinish(), and ParallelContext::worker.

Referenced by ExecParallelReinitialize().

410 {
411  FixedParallelState *fps;
412  char *error_queue_space;
413  int i;
414 
415  /* Wait for any old workers to exit. */
416  if (pcxt->nworkers_launched > 0)
417  {
420  pcxt->nworkers_launched = 0;
421  }
422 
423  /* Reset a few bits of fixed parallel state to a clean state. */
424  fps = shm_toc_lookup(pcxt->toc, PARALLEL_KEY_FIXED, false);
425  fps->last_xlog_end = 0;
426 
427  /* Recreate error queues. */
428  error_queue_space =
430  for (i = 0; i < pcxt->nworkers; ++i)
431  {
432  char *start;
433  shm_mq *mq;
434 
435  start = error_queue_space + i * PARALLEL_ERROR_QUEUE_SIZE;
436  mq = shm_mq_create(start, PARALLEL_ERROR_QUEUE_SIZE);
438  pcxt->worker[i].error_mqh = shm_mq_attach(mq, pcxt->seg, NULL);
439  }
440 }
#define PARALLEL_ERROR_QUEUE_SIZE
Definition: parallel.c:50
PGPROC * MyProc
Definition: proc.c:67
dsm_segment * seg
Definition: parallel.h:42
static void WaitForParallelWorkersToExit(ParallelContext *pcxt)
Definition: parallel.c:583
void WaitForParallelWorkersToFinish(ParallelContext *pcxt)
Definition: parallel.c:533
ParallelWorkerInfo * worker
Definition: parallel.h:45
shm_mq * shm_mq_create(void *address, Size size)
Definition: shm_mq.c:170
#define PARALLEL_KEY_FIXED
Definition: parallel.c:60
#define PARALLEL_KEY_ERROR_QUEUE
Definition: parallel.c:61
shm_mq_handle * error_mqh
Definition: parallel.h:28
int nworkers_launched
Definition: parallel.h:37
XLogRecPtr last_xlog_end
Definition: parallel.c:89
shm_mq_handle * shm_mq_attach(shm_mq *mq, dsm_segment *seg, BackgroundWorkerHandle *handle)
Definition: shm_mq.c:287
int i
Definition: shm_mq.c:69
void shm_mq_set_receiver(shm_mq *mq, PGPROC *proc)
Definition: shm_mq.c:199
void * shm_toc_lookup(shm_toc *toc, uint64 key, bool noError)
Definition: shm_toc.c:232
shm_toc * toc
Definition: parallel.h:44
static void WaitForParallelWorkersToExit ( ParallelContext pcxt)
static

Definition at line 583 of file parallel.c.

References BGWH_POSTMASTER_DIED, ParallelWorkerInfo::bgwhandle, ereport, errcode(), errmsg(), FATAL, i, ParallelContext::nworkers_launched, pfree(), status(), WaitForBackgroundWorkerShutdown(), and ParallelContext::worker.

Referenced by DestroyParallelContext(), and ReinitializeParallelDSM().

584 {
585  int i;
586 
587  /* Wait until the workers actually die. */
588  for (i = 0; i < pcxt->nworkers_launched; ++i)
589  {
591 
592  if (pcxt->worker == NULL || pcxt->worker[i].bgwhandle == NULL)
593  continue;
594 
596 
597  /*
598  * If the postmaster kicked the bucket, we have no chance of cleaning
599  * up safely -- we won't be able to tell when our workers are actually
600  * dead. This doesn't necessitate a PANIC since they will all abort
601  * eventually, but we can't safely continue this session.
602  */
603  if (status == BGWH_POSTMASTER_DIED)
604  ereport(FATAL,
605  (errcode(ERRCODE_ADMIN_SHUTDOWN),
606  errmsg("postmaster exited during a parallel transaction")));
607 
608  /* Release memory. */
609  pfree(pcxt->worker[i].bgwhandle);
610  pcxt->worker[i].bgwhandle = NULL;
611  }
612 }
int errcode(int sqlerrcode)
Definition: elog.c:575
ParallelWorkerInfo * worker
Definition: parallel.h:45
void pfree(void *pointer)
Definition: mcxt.c:949
BgwHandleStatus WaitForBackgroundWorkerShutdown(BackgroundWorkerHandle *handle)
Definition: bgworker.c:1132
#define FATAL
Definition: elog.h:52
BackgroundWorkerHandle * bgwhandle
Definition: parallel.h:27
int nworkers_launched
Definition: parallel.h:37
BgwHandleStatus
Definition: bgworker.h:101
#define ereport(elevel, rest)
Definition: elog.h:122
int errmsg(const char *fmt,...)
Definition: elog.c:797
int i
static void static void status(const char *fmt,...) pg_attribute_printf(1
Definition: pg_regress.c:224
void WaitForParallelWorkersToFinish ( ParallelContext pcxt)

Definition at line 533 of file parallel.c.

References CHECK_FOR_INTERRUPTS, ParallelWorkerInfo::error_mqh, i, FixedParallelState::last_xlog_end, MyLatch, ParallelContext::nworkers_launched, PARALLEL_KEY_FIXED, ResetLatch(), shm_toc_lookup(), ParallelContext::toc, WAIT_EVENT_PARALLEL_FINISH, WaitLatch(), WL_LATCH_SET, ParallelContext::worker, and XactLastRecEnd.

Referenced by ExecParallelFinish(), and ReinitializeParallelDSM().

534 {
535  for (;;)
536  {
537  bool anyone_alive = false;
538  int i;
539 
540  /*
541  * This will process any parallel messages that are pending, which may
542  * change the outcome of the loop that follows. It may also throw an
543  * error propagated from a worker.
544  */
546 
547  for (i = 0; i < pcxt->nworkers_launched; ++i)
548  {
549  if (pcxt->worker[i].error_mqh != NULL)
550  {
551  anyone_alive = true;
552  break;
553  }
554  }
555 
556  if (!anyone_alive)
557  break;
558 
562  }
563 
564  if (pcxt->toc != NULL)
565  {
566  FixedParallelState *fps;
567 
568  fps = shm_toc_lookup(pcxt->toc, PARALLEL_KEY_FIXED, false);
569  if (fps->last_xlog_end > XactLastRecEnd)
571  }
572 }
XLogRecPtr XactLastRecEnd
Definition: xlog.c:339
void ResetLatch(volatile Latch *latch)
Definition: latch.c:497
ParallelWorkerInfo * worker
Definition: parallel.h:45
int WaitLatch(volatile Latch *latch, int wakeEvents, long timeout, uint32 wait_event_info)
Definition: latch.c:336
#define PARALLEL_KEY_FIXED
Definition: parallel.c:60
shm_mq_handle * error_mqh
Definition: parallel.h:28
int nworkers_launched
Definition: parallel.h:37
XLogRecPtr last_xlog_end
Definition: parallel.c:89
int i
struct Latch * MyLatch
Definition: globals.c:52
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:98
#define WL_LATCH_SET
Definition: latch.h:124
void * shm_toc_lookup(shm_toc *toc, uint64 key, bool noError)
Definition: shm_toc.c:232
shm_toc * toc
Definition: parallel.h:44

Variable Documentation

Definition at line 119 of file parallel.c.

Referenced by LookupParallelWorkerFunction().

const char* fn_name

Definition at line 118 of file parallel.c.

Referenced by LookupParallelWorkerFunction().

bool InitializingParallelWorker = false
const { ... } InternalParallelWorkers[]
Initial value:
=
{
{
"ParallelQueryMain", ParallelQueryMain
}
}
void ParallelQueryMain(dsm_segment *seg, shm_toc *toc)

Referenced by LookupParallelWorkerFunction().

FixedParallelState* MyFixedParallelState
static

Definition at line 107 of file parallel.c.

Referenced by ParallelWorkerReportLastRecEnd().

volatile bool ParallelMessagePending = false
dlist_head pcxt_list = DLIST_STATIC_INIT(pcxt_list)
static

Definition at line 110 of file parallel.c.