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bgworker.h File Reference
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Data Structures

struct  BackgroundWorker
 

Macros

#define BGWORKER_SHMEM_ACCESS   0x0001
 
#define BGWORKER_BACKEND_DATABASE_CONNECTION   0x0002
 
#define BGWORKER_CLASS_PARALLEL   0x0010
 
#define BGW_DEFAULT_RESTART_INTERVAL   60
 
#define BGW_NEVER_RESTART   -1
 
#define BGW_MAXLEN   96
 
#define BGW_EXTRALEN   128
 
#define BGWORKER_BYPASS_ALLOWCONN   1
 

Typedefs

typedef void(* bgworker_main_type) (Datum main_arg)
 
typedef struct BackgroundWorker BackgroundWorker
 
typedef enum BgwHandleStatus BgwHandleStatus
 
typedef struct BackgroundWorkerHandle BackgroundWorkerHandle
 

Enumerations

enum  BgWorkerStartTime { BgWorkerStart_PostmasterStart, BgWorkerStart_ConsistentState, BgWorkerStart_RecoveryFinished }
 
enum  BgwHandleStatus { BGWH_STARTED, BGWH_NOT_YET_STARTED, BGWH_STOPPED, BGWH_POSTMASTER_DIED }
 

Functions

void RegisterBackgroundWorker (BackgroundWorker *worker)
 
bool RegisterDynamicBackgroundWorker (BackgroundWorker *worker, BackgroundWorkerHandle **handle)
 
BgwHandleStatus GetBackgroundWorkerPid (BackgroundWorkerHandle *handle, pid_t *pidp)
 
BgwHandleStatus WaitForBackgroundWorkerStartup (BackgroundWorkerHandle *handle, pid_t *pid)
 
BgwHandleStatus WaitForBackgroundWorkerShutdown (BackgroundWorkerHandle *)
 
const char * GetBackgroundWorkerTypeByPid (pid_t pid)
 
void TerminateBackgroundWorker (BackgroundWorkerHandle *handle)
 
void BackgroundWorkerInitializeConnection (const char *dbname, const char *username, uint32 flags)
 
void BackgroundWorkerInitializeConnectionByOid (Oid dboid, Oid useroid, uint32 flags)
 
void BackgroundWorkerBlockSignals (void)
 
void BackgroundWorkerUnblockSignals (void)
 

Variables

PGDLLIMPORT BackgroundWorkerMyBgworkerEntry
 

Macro Definition Documentation

◆ BGW_DEFAULT_RESTART_INTERVAL

#define BGW_DEFAULT_RESTART_INTERVAL   60

Definition at line 83 of file bgworker.h.

◆ BGW_EXTRALEN

#define BGW_EXTRALEN   128

Definition at line 86 of file bgworker.h.

Referenced by BackgroundWorkerStateChange().

◆ BGW_MAXLEN

◆ BGW_NEVER_RESTART

◆ BGWORKER_BACKEND_DATABASE_CONNECTION

◆ BGWORKER_BYPASS_ALLOWCONN

#define BGWORKER_BYPASS_ALLOWCONN   1

◆ BGWORKER_CLASS_PARALLEL

◆ BGWORKER_SHMEM_ACCESS

Typedef Documentation

◆ BackgroundWorker

◆ BackgroundWorkerHandle

Definition at line 111 of file bgworker.h.

◆ BgwHandleStatus

◆ bgworker_main_type

typedef void(* bgworker_main_type) (Datum main_arg)

Definition at line 71 of file bgworker.h.

Enumeration Type Documentation

◆ BgwHandleStatus

Enumerator
BGWH_STARTED 
BGWH_NOT_YET_STARTED 
BGWH_STOPPED 
BGWH_POSTMASTER_DIED 

Definition at line 102 of file bgworker.h.

103 {
104  BGWH_STARTED, /* worker is running */
105  BGWH_NOT_YET_STARTED, /* worker hasn't been started yet */
106  BGWH_STOPPED, /* worker has exited */
107  BGWH_POSTMASTER_DIED /* postmaster died; worker status unclear */
BgwHandleStatus
Definition: bgworker.h:102

◆ BgWorkerStartTime

Enumerator
BgWorkerStart_PostmasterStart 
BgWorkerStart_ConsistentState 
BgWorkerStart_RecoveryFinished 

Definition at line 76 of file bgworker.h.

Function Documentation

◆ BackgroundWorkerBlockSignals()

void BackgroundWorkerBlockSignals ( void  )

Definition at line 5782 of file postmaster.c.

References BlockSig, and PG_SETMASK.

5783 {
5784  PG_SETMASK(&BlockSig);
5785 }
#define PG_SETMASK(mask)
Definition: pqsignal.h:19
sigset_t BlockSig
Definition: pqsignal.c:22

◆ BackgroundWorkerInitializeConnection()

void BackgroundWorkerInitializeConnection ( const char *  dbname,
const char *  username,
uint32  flags 
)

Definition at line 5736 of file postmaster.c.

References BackgroundWorker::bgw_flags, BGWORKER_BACKEND_DATABASE_CONNECTION, BGWORKER_BYPASS_ALLOWCONN, ereport, errcode(), errmsg(), ERROR, FATAL, InitPostgres(), InvalidOid, IsInitProcessingMode, MyBgworkerEntry, NormalProcessing, and SetProcessingMode.

Referenced by ApplyLauncherMain(), and initialize_worker_spi().

5737 {
5739 
5740  /* XXX is this the right errcode? */
5742  ereport(FATAL,
5743  (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
5744  errmsg("database connection requirement not indicated during registration")));
5745 
5747 
5748  /* it had better not gotten out of "init" mode yet */
5749  if (!IsInitProcessingMode())
5750  ereport(ERROR,
5751  (errmsg("invalid processing mode in background worker")));
5753 }
int errcode(int sqlerrcode)
Definition: elog.c:610
#define SetProcessingMode(mode)
Definition: miscadmin.h:399
BackgroundWorker * MyBgworkerEntry
Definition: postmaster.c:195
#define ERROR
Definition: elog.h:43
#define BGWORKER_BYPASS_ALLOWCONN
Definition: bgworker.h:154
#define FATAL
Definition: elog.h:52
static char * username
Definition: initdb.c:134
#define InvalidOid
Definition: postgres_ext.h:36
#define ereport(elevel,...)
Definition: elog.h:144
void InitPostgres(const char *in_dbname, Oid dboid, const char *username, Oid useroid, char *out_dbname, bool override_allow_connections)
Definition: postinit.c:590
#define BGWORKER_BACKEND_DATABASE_CONNECTION
Definition: bgworker.h:59
char * dbname
Definition: streamutil.c:51
int errmsg(const char *fmt,...)
Definition: elog.c:824
#define IsInitProcessingMode()
Definition: miscadmin.h:394

◆ BackgroundWorkerInitializeConnectionByOid()

void BackgroundWorkerInitializeConnectionByOid ( Oid  dboid,
Oid  useroid,
uint32  flags 
)

Definition at line 5759 of file postmaster.c.

References BackgroundWorker::bgw_flags, BGWORKER_BACKEND_DATABASE_CONNECTION, BGWORKER_BYPASS_ALLOWCONN, ereport, errcode(), errmsg(), ERROR, FATAL, InitPostgres(), IsInitProcessingMode, MyBgworkerEntry, NormalProcessing, and SetProcessingMode.

Referenced by ApplyWorkerMain(), autoprewarm_database_main(), and ParallelWorkerMain().

5760 {
5762 
5763  /* XXX is this the right errcode? */
5765  ereport(FATAL,
5766  (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
5767  errmsg("database connection requirement not indicated during registration")));
5768 
5769  InitPostgres(NULL, dboid, NULL, useroid, NULL, (flags & BGWORKER_BYPASS_ALLOWCONN) != 0);
5770 
5771  /* it had better not gotten out of "init" mode yet */
5772  if (!IsInitProcessingMode())
5773  ereport(ERROR,
5774  (errmsg("invalid processing mode in background worker")));
5776 }
int errcode(int sqlerrcode)
Definition: elog.c:610
#define SetProcessingMode(mode)
Definition: miscadmin.h:399
BackgroundWorker * MyBgworkerEntry
Definition: postmaster.c:195
#define ERROR
Definition: elog.h:43
#define BGWORKER_BYPASS_ALLOWCONN
Definition: bgworker.h:154
#define FATAL
Definition: elog.h:52
#define ereport(elevel,...)
Definition: elog.h:144
void InitPostgres(const char *in_dbname, Oid dboid, const char *username, Oid useroid, char *out_dbname, bool override_allow_connections)
Definition: postinit.c:590
#define BGWORKER_BACKEND_DATABASE_CONNECTION
Definition: bgworker.h:59
int errmsg(const char *fmt,...)
Definition: elog.c:824
#define IsInitProcessingMode()
Definition: miscadmin.h:394

◆ BackgroundWorkerUnblockSignals()

void BackgroundWorkerUnblockSignals ( void  )

◆ GetBackgroundWorkerPid()

BgwHandleStatus GetBackgroundWorkerPid ( BackgroundWorkerHandle handle,
pid_t *  pidp 
)

Definition at line 1030 of file bgworker.c.

References Assert, BGWH_NOT_YET_STARTED, BGWH_STARTED, BGWH_STOPPED, BackgroundWorkerSlot::generation, BackgroundWorkerHandle::generation, BackgroundWorkerSlot::in_use, InvalidPid, LW_SHARED, LWLockAcquire(), LWLockRelease(), max_worker_processes, BackgroundWorkerSlot::pid, BackgroundWorkerArray::slot, and BackgroundWorkerHandle::slot.

Referenced by check_worker_status(), shm_mq_counterparty_gone(), shm_mq_wait_internal(), WaitForBackgroundWorkerShutdown(), WaitForBackgroundWorkerStartup(), WaitForParallelWorkersToAttach(), WaitForParallelWorkersToFinish(), and WaitForReplicationWorkerAttach().

1031 {
1032  BackgroundWorkerSlot *slot;
1033  pid_t pid;
1034 
1035  Assert(handle->slot < max_worker_processes);
1036  slot = &BackgroundWorkerData->slot[handle->slot];
1037 
1038  /*
1039  * We could probably arrange to synchronize access to data using memory
1040  * barriers only, but for now, let's just keep it simple and grab the
1041  * lock. It seems unlikely that there will be enough traffic here to
1042  * result in meaningful contention.
1043  */
1044  LWLockAcquire(BackgroundWorkerLock, LW_SHARED);
1045 
1046  /*
1047  * The generation number can't be concurrently changed while we hold the
1048  * lock. The pid, which is updated by the postmaster, can change at any
1049  * time, but we assume such changes are atomic. So the value we read
1050  * won't be garbage, but it might be out of date by the time the caller
1051  * examines it (but that's unavoidable anyway).
1052  *
1053  * The in_use flag could be in the process of changing from true to false,
1054  * but if it is already false then it can't change further.
1055  */
1056  if (handle->generation != slot->generation || !slot->in_use)
1057  pid = 0;
1058  else
1059  pid = slot->pid;
1060 
1061  /* All done. */
1062  LWLockRelease(BackgroundWorkerLock);
1063 
1064  if (pid == 0)
1065  return BGWH_STOPPED;
1066  else if (pid == InvalidPid)
1067  return BGWH_NOT_YET_STARTED;
1068  *pidp = pid;
1069  return BGWH_STARTED;
1070 }
static BackgroundWorkerArray * BackgroundWorkerData
Definition: bgworker.c:110
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1812
#define Assert(condition)
Definition: c.h:745
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1208
int max_worker_processes
Definition: globals.c:134
BackgroundWorkerSlot slot[FLEXIBLE_ARRAY_MEMBER]
Definition: bgworker.c:101
#define InvalidPid
Definition: miscadmin.h:32

◆ GetBackgroundWorkerTypeByPid()

const char* GetBackgroundWorkerTypeByPid ( pid_t  pid)

Definition at line 1238 of file bgworker.c.

References BGW_MAXLEN, BackgroundWorker::bgw_type, LW_SHARED, LWLockAcquire(), LWLockRelease(), BackgroundWorkerSlot::pid, BackgroundWorkerArray::slot, BackgroundWorkerArray::total_slots, and BackgroundWorkerSlot::worker.

Referenced by pg_stat_get_activity().

1239 {
1240  int slotno;
1241  bool found = false;
1242  static char result[BGW_MAXLEN];
1243 
1244  LWLockAcquire(BackgroundWorkerLock, LW_SHARED);
1245 
1246  for (slotno = 0; slotno < BackgroundWorkerData->total_slots; slotno++)
1247  {
1249 
1250  if (slot->pid > 0 && slot->pid == pid)
1251  {
1252  strcpy(result, slot->worker.bgw_type);
1253  found = true;
1254  break;
1255  }
1256  }
1257 
1258  LWLockRelease(BackgroundWorkerLock);
1259 
1260  if (!found)
1261  return NULL;
1262 
1263  return result;
1264 }
static BackgroundWorkerArray * BackgroundWorkerData
Definition: bgworker.c:110
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1812
BackgroundWorker worker
Definition: bgworker.c:82
#define BGW_MAXLEN
Definition: bgworker.h:85
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1208
char bgw_type[BGW_MAXLEN]
Definition: bgworker.h:91
BackgroundWorkerSlot slot[FLEXIBLE_ARRAY_MEMBER]
Definition: bgworker.c:101

◆ RegisterBackgroundWorker()

void RegisterBackgroundWorker ( BackgroundWorker worker)

Definition at line 834 of file bgworker.c.

References BackgroundWorker::bgw_library_name, BackgroundWorker::bgw_name, BackgroundWorker::bgw_notify_pid, DEBUG1, ereport, errcode(), errdetail_plural(), errhint(), errmsg(), IsUnderPostmaster, LOG, malloc, max_worker_processes, process_shared_preload_libraries_in_progress, RegisteredBgWorker::rw_backend, RegisteredBgWorker::rw_child_slot, RegisteredBgWorker::rw_crashed_at, RegisteredBgWorker::rw_lnode, RegisteredBgWorker::rw_pid, RegisteredBgWorker::rw_terminate, RegisteredBgWorker::rw_worker, SanityCheckBackgroundWorker(), slist_push_head(), and BackgroundWorkerSlot::worker.

Referenced by _PG_init(), ApplyLauncherRegister(), and apw_start_leader_worker().

835 {
836  RegisteredBgWorker *rw;
837  static int numworkers = 0;
838 
839  if (!IsUnderPostmaster)
840  ereport(DEBUG1,
841  (errmsg("registering background worker \"%s\"", worker->bgw_name)));
842 
844  strcmp(worker->bgw_library_name, "postgres") != 0)
845  {
846  if (!IsUnderPostmaster)
847  ereport(LOG,
848  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
849  errmsg("background worker \"%s\": must be registered in shared_preload_libraries",
850  worker->bgw_name)));
851  return;
852  }
853 
854  if (!SanityCheckBackgroundWorker(worker, LOG))
855  return;
856 
857  if (worker->bgw_notify_pid != 0)
858  {
859  ereport(LOG,
860  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
861  errmsg("background worker \"%s\": only dynamic background workers can request notification",
862  worker->bgw_name)));
863  return;
864  }
865 
866  /*
867  * Enforce maximum number of workers. Note this is overly restrictive: we
868  * could allow more non-shmem-connected workers, because these don't count
869  * towards the MAX_BACKENDS limit elsewhere. For now, it doesn't seem
870  * important to relax this restriction.
871  */
872  if (++numworkers > max_worker_processes)
873  {
874  ereport(LOG,
875  (errcode(ERRCODE_CONFIGURATION_LIMIT_EXCEEDED),
876  errmsg("too many background workers"),
877  errdetail_plural("Up to %d background worker can be registered with the current settings.",
878  "Up to %d background workers can be registered with the current settings.",
881  errhint("Consider increasing the configuration parameter \"max_worker_processes\".")));
882  return;
883  }
884 
885  /*
886  * Copy the registration data into the registered workers list.
887  */
888  rw = malloc(sizeof(RegisteredBgWorker));
889  if (rw == NULL)
890  {
891  ereport(LOG,
892  (errcode(ERRCODE_OUT_OF_MEMORY),
893  errmsg("out of memory")));
894  return;
895  }
896 
897  rw->rw_worker = *worker;
898  rw->rw_backend = NULL;
899  rw->rw_pid = 0;
900  rw->rw_child_slot = 0;
901  rw->rw_crashed_at = 0;
902  rw->rw_terminate = false;
903 
905 }
struct bkend * rw_backend
#define DEBUG1
Definition: elog.h:25
int errhint(const char *fmt,...)
Definition: elog.c:1071
bool process_shared_preload_libraries_in_progress
Definition: miscinit.c:1596
static void slist_push_head(slist_head *head, slist_node *node)
Definition: ilist.h:574
int errcode(int sqlerrcode)
Definition: elog.c:610
#define LOG
Definition: elog.h:26
#define malloc(a)
Definition: header.h:50
slist_head BackgroundWorkerList
Definition: bgworker.c:42
bool IsUnderPostmaster
Definition: globals.c:109
static bool SanityCheckBackgroundWorker(BackgroundWorker *worker, int elevel)
Definition: bgworker.c:582
#define ereport(elevel,...)
Definition: elog.h:144
char bgw_name[BGW_MAXLEN]
Definition: bgworker.h:90
int errdetail_plural(const char *fmt_singular, const char *fmt_plural, unsigned long n,...)
Definition: elog.c:1049
int errmsg(const char *fmt,...)
Definition: elog.c:824
pid_t bgw_notify_pid
Definition: bgworker.h:99
int max_worker_processes
Definition: globals.c:134
BackgroundWorker rw_worker
char bgw_library_name[BGW_MAXLEN]
Definition: bgworker.h:95

◆ RegisterDynamicBackgroundWorker()

bool RegisterDynamicBackgroundWorker ( BackgroundWorker worker,
BackgroundWorkerHandle **  handle 
)

Definition at line 918 of file bgworker.c.

References Assert, BackgroundWorker::bgw_flags, BGWORKER_CLASS_PARALLEL, ERROR, BackgroundWorkerSlot::generation, BackgroundWorkerSlot::in_use, InvalidPid, IsUnderPostmaster, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), MAX_PARALLEL_WORKER_LIMIT, max_parallel_workers, palloc(), BackgroundWorkerArray::parallel_register_count, BackgroundWorkerArray::parallel_terminate_count, pg_write_barrier, BackgroundWorkerSlot::pid, PMSIGNAL_BACKGROUND_WORKER_CHANGE, SanityCheckBackgroundWorker(), SendPostmasterSignal(), BackgroundWorkerArray::slot, success, BackgroundWorkerSlot::terminate, BackgroundWorkerArray::total_slots, and BackgroundWorkerSlot::worker.

Referenced by apw_start_database_worker(), apw_start_leader_worker(), LaunchParallelWorkers(), logicalrep_worker_launch(), setup_background_workers(), and worker_spi_launch().

920 {
921  int slotno;
922  bool success = false;
923  bool parallel;
924  uint64 generation = 0;
925 
926  /*
927  * We can't register dynamic background workers from the postmaster. If
928  * this is a standalone backend, we're the only process and can't start
929  * any more. In a multi-process environment, it might be theoretically
930  * possible, but we don't currently support it due to locking
931  * considerations; see comments on the BackgroundWorkerSlot data
932  * structure.
933  */
934  if (!IsUnderPostmaster)
935  return false;
936 
937  if (!SanityCheckBackgroundWorker(worker, ERROR))
938  return false;
939 
940  parallel = (worker->bgw_flags & BGWORKER_CLASS_PARALLEL) != 0;
941 
942  LWLockAcquire(BackgroundWorkerLock, LW_EXCLUSIVE);
943 
944  /*
945  * If this is a parallel worker, check whether there are already too many
946  * parallel workers; if so, don't register another one. Our view of
947  * parallel_terminate_count may be slightly stale, but that doesn't really
948  * matter: we would have gotten the same result if we'd arrived here
949  * slightly earlier anyway. There's no help for it, either, since the
950  * postmaster must not take locks; a memory barrier wouldn't guarantee
951  * anything useful.
952  */
956  {
960  LWLockRelease(BackgroundWorkerLock);
961  return false;
962  }
963 
964  /*
965  * Look for an unused slot. If we find one, grab it.
966  */
967  for (slotno = 0; slotno < BackgroundWorkerData->total_slots; ++slotno)
968  {
970 
971  if (!slot->in_use)
972  {
973  memcpy(&slot->worker, worker, sizeof(BackgroundWorker));
974  slot->pid = InvalidPid; /* indicates not started yet */
975  slot->generation++;
976  slot->terminate = false;
977  generation = slot->generation;
978  if (parallel)
980 
981  /*
982  * Make sure postmaster doesn't see the slot as in use before it
983  * sees the new contents.
984  */
986 
987  slot->in_use = true;
988  success = true;
989  break;
990  }
991  }
992 
993  LWLockRelease(BackgroundWorkerLock);
994 
995  /* If we found a slot, tell the postmaster to notice the change. */
996  if (success)
998 
999  /*
1000  * If we found a slot and the user has provided a handle, initialize it.
1001  */
1002  if (success && handle)
1003  {
1004  *handle = palloc(sizeof(BackgroundWorkerHandle));
1005  (*handle)->slot = slotno;
1006  (*handle)->generation = generation;
1007  }
1008 
1009  return success;
1010 }
int max_parallel_workers
Definition: globals.c:135
static BackgroundWorkerArray * BackgroundWorkerData
Definition: bgworker.c:110
#define BGWORKER_CLASS_PARALLEL
Definition: bgworker.h:67
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1812
#define ERROR
Definition: elog.h:43
uint32 parallel_register_count
Definition: bgworker.c:99
bool IsUnderPostmaster
Definition: globals.c:109
static bool SanityCheckBackgroundWorker(BackgroundWorker *worker, int elevel)
Definition: bgworker.c:582
#define Assert(condition)
Definition: c.h:745
BackgroundWorker worker
Definition: bgworker.c:82
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1208
void * palloc(Size size)
Definition: mcxt.c:950
uint32 parallel_terminate_count
Definition: bgworker.c:100
#define pg_write_barrier()
Definition: atomics.h:159
void SendPostmasterSignal(PMSignalReason reason)
Definition: pmsignal.c:146
#define MAX_PARALLEL_WORKER_LIMIT
BackgroundWorkerSlot slot[FLEXIBLE_ARRAY_MEMBER]
Definition: bgworker.c:101
static bool success
Definition: initdb.c:162
#define InvalidPid
Definition: miscadmin.h:32

◆ TerminateBackgroundWorker()

void TerminateBackgroundWorker ( BackgroundWorkerHandle handle)

Definition at line 1163 of file bgworker.c.

References Assert, BackgroundWorkerSlot::generation, BackgroundWorkerHandle::generation, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), max_worker_processes, PMSIGNAL_BACKGROUND_WORKER_CHANGE, SendPostmasterSignal(), BackgroundWorkerArray::slot, BackgroundWorkerHandle::slot, and BackgroundWorkerSlot::terminate.

Referenced by cleanup_background_workers(), and DestroyParallelContext().

1164 {
1165  BackgroundWorkerSlot *slot;
1166  bool signal_postmaster = false;
1167 
1168  Assert(handle->slot < max_worker_processes);
1169  slot = &BackgroundWorkerData->slot[handle->slot];
1170 
1171  /* Set terminate flag in shared memory, unless slot has been reused. */
1172  LWLockAcquire(BackgroundWorkerLock, LW_EXCLUSIVE);
1173  if (handle->generation == slot->generation)
1174  {
1175  slot->terminate = true;
1176  signal_postmaster = true;
1177  }
1178  LWLockRelease(BackgroundWorkerLock);
1179 
1180  /* Make sure the postmaster notices the change to shared memory. */
1181  if (signal_postmaster)
1183 }
static BackgroundWorkerArray * BackgroundWorkerData
Definition: bgworker.c:110
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1812
#define Assert(condition)
Definition: c.h:745
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1208
int max_worker_processes
Definition: globals.c:134
void SendPostmasterSignal(PMSignalReason reason)
Definition: pmsignal.c:146
BackgroundWorkerSlot slot[FLEXIBLE_ARRAY_MEMBER]
Definition: bgworker.c:101

◆ WaitForBackgroundWorkerShutdown()

BgwHandleStatus WaitForBackgroundWorkerShutdown ( BackgroundWorkerHandle )

Definition at line 1124 of file bgworker.c.

References BGWH_POSTMASTER_DIED, BGWH_STOPPED, CHECK_FOR_INTERRUPTS, GetBackgroundWorkerPid(), MyLatch, BackgroundWorkerSlot::pid, ResetLatch(), status(), WAIT_EVENT_BGWORKER_SHUTDOWN, WaitLatch(), WL_LATCH_SET, and WL_POSTMASTER_DEATH.

Referenced by apw_start_database_worker(), and WaitForParallelWorkersToExit().

1125 {
1127  int rc;
1128 
1129  for (;;)
1130  {
1131  pid_t pid;
1132 
1134 
1135  status = GetBackgroundWorkerPid(handle, &pid);
1136  if (status == BGWH_STOPPED)
1137  break;
1138 
1139  rc = WaitLatch(MyLatch,
1142 
1143  if (rc & WL_POSTMASTER_DEATH)
1144  {
1145  status = BGWH_POSTMASTER_DIED;
1146  break;
1147  }
1148 
1150  }
1151 
1152  return status;
1153 }
void ResetLatch(Latch *latch)
Definition: latch.c:588
int WaitLatch(Latch *latch, int wakeEvents, long timeout, uint32 wait_event_info)
Definition: latch.c:390
BgwHandleStatus
Definition: bgworker.h:102
#define WL_POSTMASTER_DEATH
Definition: latch.h:128
struct Latch * MyLatch
Definition: globals.c:54
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:99
static void static void status(const char *fmt,...) pg_attribute_printf(1
Definition: pg_regress.c:227
#define WL_LATCH_SET
Definition: latch.h:124
BgwHandleStatus GetBackgroundWorkerPid(BackgroundWorkerHandle *handle, pid_t *pidp)
Definition: bgworker.c:1030

◆ WaitForBackgroundWorkerStartup()

BgwHandleStatus WaitForBackgroundWorkerStartup ( BackgroundWorkerHandle handle,
pid_t *  pid 
)

Definition at line 1082 of file bgworker.c.

References BGWH_NOT_YET_STARTED, BGWH_POSTMASTER_DIED, BGWH_STARTED, CHECK_FOR_INTERRUPTS, GetBackgroundWorkerPid(), MyLatch, BackgroundWorkerSlot::pid, ResetLatch(), status(), WAIT_EVENT_BGWORKER_STARTUP, WaitLatch(), WL_LATCH_SET, and WL_POSTMASTER_DEATH.

Referenced by apw_start_leader_worker(), and worker_spi_launch().

1083 {
1085  int rc;
1086 
1087  for (;;)
1088  {
1089  pid_t pid;
1090 
1092 
1093  status = GetBackgroundWorkerPid(handle, &pid);
1094  if (status == BGWH_STARTED)
1095  *pidp = pid;
1096  if (status != BGWH_NOT_YET_STARTED)
1097  break;
1098 
1099  rc = WaitLatch(MyLatch,
1102 
1103  if (rc & WL_POSTMASTER_DEATH)
1104  {
1105  status = BGWH_POSTMASTER_DIED;
1106  break;
1107  }
1108 
1110  }
1111 
1112  return status;
1113 }
void ResetLatch(Latch *latch)
Definition: latch.c:588
int WaitLatch(Latch *latch, int wakeEvents, long timeout, uint32 wait_event_info)
Definition: latch.c:390
BgwHandleStatus
Definition: bgworker.h:102
#define WL_POSTMASTER_DEATH
Definition: latch.h:128
struct Latch * MyLatch
Definition: globals.c:54
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:99
static void static void status(const char *fmt,...) pg_attribute_printf(1
Definition: pg_regress.c:227
#define WL_LATCH_SET
Definition: latch.h:124
BgwHandleStatus GetBackgroundWorkerPid(BackgroundWorkerHandle *handle, pid_t *pidp)
Definition: bgworker.c:1030

Variable Documentation

◆ MyBgworkerEntry