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📁 ..
📄 backendid.h(1.1 KB)
📄 barrier.h(674 B)
📄 block.h(3.21 KB)
📄 buf.h(1.06 KB)
📄 buf_internals.h(12.24 KB)
📄 buffile.h(1.67 KB)
📄 bufmgr.h(9 KB)
📄 bufpage.h(14.91 KB)
📄 checksum.h(666 B)
📄 checksum_impl.h(8.59 KB)
📄 copydir.h(561 B)
📄 dsm.h(1.95 KB)
📄 dsm_impl.h(2.12 KB)
📄 fd.h(4.27 KB)
📄 freespace.h(1.36 KB)
📄 fsm_internals.h(2.26 KB)
📄 indexfsm.h(795 B)
📄 ipc.h(2.67 KB)
📄 item.h(469 B)
📄 itemid.h(4.24 KB)
📄 itemptr.h(3.93 KB)
📄 large_object.h(3.6 KB)
📄 latch.h(6.55 KB)
📄 lmgr.h(4.19 KB)
📄 lock.h(22.89 KB)
📄 lockdefs.h(1.86 KB)
📄 lwlock.h(9.19 KB)
📄 lwlocknames.h(2.42 KB)
📄 off.h(1.58 KB)
📄 pg_sema.h(2.39 KB)
📄 pg_shmem.h(2.23 KB)
📄 pmsignal.h(2.1 KB)
📄 pos.h(1.56 KB)
📄 predicate.h(2.56 KB)
📄 predicate_internals.h(16.96 KB)
📄 proc.h(10.81 KB)
📄 procarray.h(3.5 KB)
📄 procsignal.h(1.9 KB)
📄 reinit.h(592 B)
📄 relfilenode.h(3.81 KB)
📄 s_lock.h(28.64 KB)
📄 shm_mq.h(2.59 KB)
📄 shm_toc.h(2.01 KB)
📄 shmem.h(2.63 KB)
📄 sinval.h(5.41 KB)
📄 sinvaladt.h(1.58 KB)
📄 smgr.h(5.96 KB)
📄 spin.h(2.42 KB)
📄 standby.h(3.35 KB)
📄 standbydefs.h(2.25 KB)

Editing: 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) 1996-2016, 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);

/* 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 */

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Editing: pg_sema.h

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