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dsm_impl.h File Reference
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Macros

#define DSM_IMPL_NONE   0
 
#define DSM_IMPL_POSIX   1
 
#define DSM_IMPL_SYSV   2
 
#define DSM_IMPL_WINDOWS   3
 
#define DSM_IMPL_MMAP   4
 
#define USE_DSM_SYSV
 
#define DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE   DSM_IMPL_SYSV
 
#define USE_DSM_MMAP
 
#define PG_DYNSHMEM_DIR   "pg_dynshmem"
 
#define PG_DYNSHMEM_MMAP_FILE_PREFIX   "mmap."
 

Typedefs

typedef uint32 dsm_handle
 

Enumerations

enum  dsm_op {
  DSM_OP_CREATE, DSM_OP_ATTACH, DSM_OP_DETACH, DSM_OP_RESIZE,
  DSM_OP_DESTROY
}
 

Functions

bool dsm_impl_op (dsm_op op, dsm_handle handle, Size request_size, void **impl_private, void **mapped_address, Size *mapped_size, int elevel)
 
bool dsm_impl_can_resize (void)
 
void dsm_impl_pin_segment (dsm_handle handle, void *impl_private, void **impl_private_pm_handle)
 
void dsm_impl_unpin_segment (dsm_handle handle, void **impl_private)
 

Variables

int dynamic_shared_memory_type
 

Macro Definition Documentation

#define DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE   DSM_IMPL_SYSV

Definition at line 37 of file dsm_impl.h.

#define DSM_IMPL_MMAP   4

Definition at line 21 of file dsm_impl.h.

Referenced by dsm_impl_can_resize(), dsm_impl_op(), and dsm_postmaster_startup().

#define DSM_IMPL_POSIX   1

Definition at line 18 of file dsm_impl.h.

Referenced by dsm_impl_can_resize(), and dsm_impl_op().

#define DSM_IMPL_SYSV   2

Definition at line 19 of file dsm_impl.h.

Referenced by dsm_impl_can_resize(), and dsm_impl_op().

#define DSM_IMPL_WINDOWS   3
#define PG_DYNSHMEM_DIR   "pg_dynshmem"

Definition at line 51 of file dsm_impl.h.

Referenced by dsm_cleanup_for_mmap(), and dsm_impl_mmap().

#define PG_DYNSHMEM_MMAP_FILE_PREFIX   "mmap."

Definition at line 52 of file dsm_impl.h.

Referenced by dsm_cleanup_for_mmap(), and dsm_impl_mmap().

#define USE_DSM_MMAP

Definition at line 39 of file dsm_impl.h.

#define USE_DSM_SYSV

Definition at line 35 of file dsm_impl.h.

Typedef Documentation

Definition at line 55 of file dsm_impl.h.

Enumeration Type Documentation

enum dsm_op
Enumerator
DSM_OP_CREATE 
DSM_OP_ATTACH 
DSM_OP_DETACH 
DSM_OP_RESIZE 
DSM_OP_DESTROY 

Definition at line 58 of file dsm_impl.h.

Function Documentation

bool dsm_impl_can_resize ( void  )

Definition at line 206 of file dsm_impl.c.

References DSM_IMPL_MMAP, DSM_IMPL_NONE, DSM_IMPL_POSIX, DSM_IMPL_SYSV, DSM_IMPL_WINDOWS, and dynamic_shared_memory_type.

207 {
209  {
210  case DSM_IMPL_NONE:
211  return false;
212  case DSM_IMPL_POSIX:
213  return true;
214  case DSM_IMPL_SYSV:
215  return false;
216  case DSM_IMPL_WINDOWS:
217  return false;
218  case DSM_IMPL_MMAP:
219  return true;
220  default:
221  return false; /* should not happen */
222  }
223 }
#define DSM_IMPL_MMAP
Definition: dsm_impl.h:21
#define DSM_IMPL_SYSV
Definition: dsm_impl.h:19
#define DSM_IMPL_WINDOWS
Definition: dsm_impl.h:20
#define DSM_IMPL_POSIX
Definition: dsm_impl.h:18
int dynamic_shared_memory_type
Definition: dsm_impl.c:111
#define DSM_IMPL_NONE
Definition: dsm_impl.h:17
bool dsm_impl_op ( dsm_op  op,
dsm_handle  handle,
Size  request_size,
void **  impl_private,
void **  mapped_address,
Size mapped_size,
int  elevel 
)

Definition at line 161 of file dsm_impl.c.

References Assert, DSM_IMPL_MMAP, dsm_impl_mmap(), DSM_IMPL_POSIX, DSM_IMPL_SYSV, dsm_impl_sysv(), DSM_IMPL_WINDOWS, DSM_OP_ATTACH, DSM_OP_CREATE, DSM_OP_RESIZE, dynamic_shared_memory_type, elog, ERROR, and NULL.

Referenced by dsm_attach(), dsm_backend_startup(), dsm_cleanup_using_control_segment(), dsm_create(), dsm_detach(), dsm_detach_all(), dsm_postmaster_shutdown(), dsm_postmaster_startup(), dsm_remap(), dsm_resize(), and dsm_unpin_segment().

164 {
165  Assert(op == DSM_OP_CREATE || op == DSM_OP_RESIZE || request_size == 0);
166  Assert((op != DSM_OP_CREATE && op != DSM_OP_ATTACH) ||
167  (*mapped_address == NULL && *mapped_size == 0));
168 
170  {
171 #ifdef USE_DSM_POSIX
172  case DSM_IMPL_POSIX:
173  return dsm_impl_posix(op, handle, request_size, impl_private,
174  mapped_address, mapped_size, elevel);
175 #endif
176 #ifdef USE_DSM_SYSV
177  case DSM_IMPL_SYSV:
178  return dsm_impl_sysv(op, handle, request_size, impl_private,
179  mapped_address, mapped_size, elevel);
180 #endif
181 #ifdef USE_DSM_WINDOWS
182  case DSM_IMPL_WINDOWS:
183  return dsm_impl_windows(op, handle, request_size, impl_private,
184  mapped_address, mapped_size, elevel);
185 #endif
186 #ifdef USE_DSM_MMAP
187  case DSM_IMPL_MMAP:
188  return dsm_impl_mmap(op, handle, request_size, impl_private,
189  mapped_address, mapped_size, elevel);
190 #endif
191  default:
192  elog(ERROR, "unexpected dynamic shared memory type: %d",
194  return false;
195  }
196 }
#define DSM_IMPL_MMAP
Definition: dsm_impl.h:21
#define DSM_IMPL_SYSV
Definition: dsm_impl.h:19
#define DSM_IMPL_WINDOWS
Definition: dsm_impl.h:20
static bool dsm_impl_mmap(dsm_op op, dsm_handle handle, Size request_size, void **impl_private, void **mapped_address, Size *mapped_size, int elevel)
Definition: dsm_impl.c:798
#define ERROR
Definition: elog.h:43
#define DSM_IMPL_POSIX
Definition: dsm_impl.h:18
int dynamic_shared_memory_type
Definition: dsm_impl.c:111
static int elevel
Definition: vacuumlazy.c:136
static bool dsm_impl_sysv(dsm_op op, dsm_handle handle, Size request_size, void **impl_private, void **mapped_address, Size *mapped_size, int elevel)
Definition: dsm_impl.c:407
#define NULL
Definition: c.h:226
#define Assert(condition)
Definition: c.h:671
#define elog
Definition: elog.h:219
void dsm_impl_pin_segment ( dsm_handle  handle,
void *  impl_private,
void **  impl_private_pm_handle 
)

Definition at line 1006 of file dsm_impl.c.

References _dosmaperr(), DSM_IMPL_WINDOWS, dynamic_shared_memory_type, ereport, errcode_for_dynamic_shared_memory(), errmsg(), ERROR, FALSE, SEGMENT_NAME_PREFIX, and snprintf().

Referenced by dsm_pin_segment().

1008 {
1010  {
1011 #ifdef USE_DSM_WINDOWS
1012  case DSM_IMPL_WINDOWS:
1013  {
1014  HANDLE hmap;
1015 
1016  if (!DuplicateHandle(GetCurrentProcess(), impl_private,
1017  PostmasterHandle, &hmap, 0, FALSE,
1018  DUPLICATE_SAME_ACCESS))
1019  {
1020  char name[64];
1021 
1022  snprintf(name, 64, "%s.%u", SEGMENT_NAME_PREFIX, handle);
1023  _dosmaperr(GetLastError());
1024  ereport(ERROR,
1026  errmsg("could not duplicate handle for \"%s\": %m",
1027  name)));
1028  }
1029 
1030  /*
1031  * Here, we remember the handle that we created in the
1032  * postmaster process. This handle isn't actually usable in
1033  * any process other than the postmaster, but that doesn't
1034  * matter. We're just holding onto it so that, if the segment
1035  * is unpinned, dsm_impl_unpin_segment can close it.
1036  */
1037  *impl_private_pm_handle = hmap;
1038  break;
1039  }
1040 #endif
1041  default:
1042  break;
1043  }
1044 }
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
#define DSM_IMPL_WINDOWS
Definition: dsm_impl.h:20
static int errcode_for_dynamic_shared_memory(void)
Definition: dsm_impl.c:1088
#define ERROR
Definition: elog.h:43
#define FALSE
Definition: c.h:218
#define SEGMENT_NAME_PREFIX
Definition: dsm_impl.c:116
int dynamic_shared_memory_type
Definition: dsm_impl.c:111
#define ereport(elevel, rest)
Definition: elog.h:122
void _dosmaperr(unsigned long)
Definition: win32error.c:171
const char * name
Definition: encode.c:521
int errmsg(const char *fmt,...)
Definition: elog.c:797
void dsm_impl_unpin_segment ( dsm_handle  handle,
void **  impl_private 
)

Definition at line 1056 of file dsm_impl.c.

References _dosmaperr(), DSM_IMPL_WINDOWS, dynamic_shared_memory_type, ereport, errcode_for_dynamic_shared_memory(), errmsg(), ERROR, FALSE, NULL, SEGMENT_NAME_PREFIX, and snprintf().

Referenced by dsm_unpin_segment().

1057 {
1059  {
1060 #ifdef USE_DSM_WINDOWS
1061  case DSM_IMPL_WINDOWS:
1062  {
1063  if (*impl_private &&
1064  !DuplicateHandle(PostmasterHandle, *impl_private,
1065  NULL, NULL, 0, FALSE,
1066  DUPLICATE_CLOSE_SOURCE))
1067  {
1068  char name[64];
1069 
1070  snprintf(name, 64, "%s.%u", SEGMENT_NAME_PREFIX, handle);
1071  _dosmaperr(GetLastError());
1072  ereport(ERROR,
1074  errmsg("could not duplicate handle for \"%s\": %m",
1075  name)));
1076  }
1077 
1078  *impl_private = NULL;
1079  break;
1080  }
1081 #endif
1082  default:
1083  break;
1084  }
1085 }
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
#define DSM_IMPL_WINDOWS
Definition: dsm_impl.h:20
static int errcode_for_dynamic_shared_memory(void)
Definition: dsm_impl.c:1088
#define ERROR
Definition: elog.h:43
#define FALSE
Definition: c.h:218
#define SEGMENT_NAME_PREFIX
Definition: dsm_impl.c:116
int dynamic_shared_memory_type
Definition: dsm_impl.c:111
#define ereport(elevel, rest)
Definition: elog.h:122
#define NULL
Definition: c.h:226
void _dosmaperr(unsigned long)
Definition: win32error.c:171
const char * name
Definition: encode.c:521
int errmsg(const char *fmt,...)
Definition: elog.c:797

Variable Documentation