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Name	Size	Permission
backendid.h	730 B	-rw-r--r--
barrier.h	6.6 KB	-rw-r--r--
block.h	3.21 KB	-rw-r--r--
buf.h	1.06 KB	-rw-r--r--
buf_internals.h	7.79 KB	-rw-r--r--
buffile.h	1.67 KB	-rw-r--r--
bufmgr.h	7.2 KB	-rw-r--r--
bufpage.h	12.91 KB	-rw-r--r--
copydir.h	561 B	-rw-r--r--
fd.h	3.56 KB	-rw-r--r--
freespace.h	1.23 KB	-rw-r--r--
fsm_internals.h	2.24 KB	-rw-r--r--
indexfsm.h	795 B	-rw-r--r--
ipc.h	2.54 KB	-rw-r--r--
item.h	469 B	-rw-r--r--
itemid.h	4.24 KB	-rw-r--r--
itemptr.h	3.72 KB	-rw-r--r--
large_object.h	2.89 KB	-rw-r--r--
latch.h	5.28 KB	-rw-r--r--
lmgr.h	3.22 KB	-rw-r--r--
lock.h	21.16 KB	-rw-r--r--
lwlock.h	3.58 KB	-rw-r--r--
off.h	1.58 KB	-rw-r--r--
pg_sema.h	2.41 KB	-rw-r--r--
pg_shmem.h	1.95 KB	-rw-r--r--
pmsignal.h	2.03 KB	-rw-r--r--
pos.h	1.56 KB	-rw-r--r--
predicate.h	2.56 KB	-rw-r--r--
predicate_internals.h	16.98 KB	-rw-r--r--
proc.h	9.58 KB	-rw-r--r--
procarray.h	2.96 KB	-rw-r--r--
procsignal.h	1.76 KB	-rw-r--r--
reinit.h	588 B	-rw-r--r--
relfilenode.h	4.31 KB	-rw-r--r--
s_lock.h	28 KB	-rw-r--r--
shmem.h	2.63 KB	-rw-r--r--
sinval.h	4.97 KB	-rw-r--r--
sinvaladt.h	1.49 KB	-rw-r--r--
smgr.h	5.67 KB	-rw-r--r--
spin.h	2.71 KB	-rw-r--r--
standby.h	3.97 KB	-rw-r--r--

Code Editor : pg_sema.h

/*-------------------------------------------------------------------------
 *
 * pg_sema.h
 *	  Platform-independent API for semaphores.
 *
 * PostgreSQL requires counting semaphores (the kind that keep track of
 * multiple unlock operations, and will allow an equal number of subsequent
 * lock operations before blocking).  The underlying implementation is
 * not the same on every platform.  This file defines the API that must
 * be provided by each port.
 *
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/pg_sema.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef PG_SEMA_H
#define PG_SEMA_H

/*
 * PGSemaphoreData and pointer type PGSemaphore are the data structure
 * representing an individual semaphore.  The contents of PGSemaphoreData
 * vary across implementations and must never be touched by platform-
 * independent code.  PGSemaphoreData structures are always allocated
 * in shared memory (to support implementations where the data changes during
 * lock/unlock).
 *
 * pg_config.h must define exactly one of the USE_xxx_SEMAPHORES symbols.
 */

#ifdef USE_NAMED_POSIX_SEMAPHORES

#include <semaphore.h>

typedef sem_t *PGSemaphoreData;
#endif

#ifdef USE_UNNAMED_POSIX_SEMAPHORES

#include <semaphore.h>

typedef sem_t PGSemaphoreData;
#endif

#ifdef USE_SYSV_SEMAPHORES

typedef struct PGSemaphoreData
{
	int			semId;			/* semaphore set identifier */
	int			semNum;			/* semaphore number within set */
} PGSemaphoreData;
#endif

#ifdef USE_WIN32_SEMAPHORES

typedef HANDLE PGSemaphoreData;
#endif

typedef PGSemaphoreData *PGSemaphore;

/* Module initialization (called during postmaster start or shmem reinit) */
extern void PGReserveSemaphores(int maxSemas, int port);

/* Initialize a PGSemaphore structure to represent a sema with count 1 */
extern void PGSemaphoreCreate(PGSemaphore sema);

/* Reset a previously-initialized PGSemaphore to have count 0 */
extern void PGSemaphoreReset(PGSemaphore sema);

/* Lock a semaphore (decrement count), blocking if count would be < 0 */
extern void PGSemaphoreLock(PGSemaphore sema, bool interruptOK);

/* Unlock a semaphore (increment count) */
extern void PGSemaphoreUnlock(PGSemaphore sema);

/* Lock a semaphore only if able to do so without blocking */
extern bool PGSemaphoreTryLock(PGSemaphore sema);

#endif   /* PG_SEMA_H */

${this.title}

Code Editor : pg_sema.h