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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: spin.h

/*-------------------------------------------------------------------------
 *
 * spin.h
 *	   Hardware-independent implementation of spinlocks.
 *
 *
 *	The hardware-independent interface to spinlocks is defined by the
 *	typedef "slock_t" and these macros:
 *
 *	void SpinLockInit(volatile slock_t *lock)
 *		Initialize a spinlock (to the unlocked state).
 *
 *	void SpinLockAcquire(volatile slock_t *lock)
 *		Acquire a spinlock, waiting if necessary.
 *		Time out and abort() if unable to acquire the lock in a
 *		"reasonable" amount of time --- typically ~ 1 minute.
 *
 *	void SpinLockRelease(volatile slock_t *lock)
 *		Unlock a previously acquired lock.
 *
 *	bool SpinLockFree(slock_t *lock)
 *		Tests if the lock is free. Returns TRUE if free, FALSE if locked.
 *		This does *not* change the state of the lock.
 *
 *	Callers must beware that the macro argument may be evaluated multiple
 *	times!
 *
 *	Load and store operations in calling code are guaranteed not to be
 *	reordered with respect to these operations, because they include a
 *	compiler barrier.  (Before PostgreSQL 9.5, callers needed to use a
 *	volatile qualifier to access data protected by spinlocks.)
 *
 *	Keep in mind the coding rule that spinlocks must not be held for more
 *	than a few instructions.  In particular, we assume it is not possible
 *	for a CHECK_FOR_INTERRUPTS() to occur while holding a spinlock, and so
 *	it is not necessary to do HOLD/RESUME_INTERRUPTS() in these macros.
 *
 *	These macros are implemented in terms of hardware-dependent macros
 *	supplied by s_lock.h.  There is not currently any extra functionality
 *	added by this header, but there has been in the past and may someday
 *	be again.
 *
 *
 * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/storage/spin.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef SPIN_H
#define SPIN_H

#include "storage/s_lock.h"
#ifndef HAVE_SPINLOCKS
#include "storage/pg_sema.h"
#endif

#define SpinLockInit(lock)	S_INIT_LOCK(lock)

#define SpinLockAcquire(lock) S_LOCK(lock)

#define SpinLockRelease(lock) S_UNLOCK(lock)

#define SpinLockFree(lock)	S_LOCK_FREE(lock)

extern int	SpinlockSemas(void);
extern Size SpinlockSemaSize(void);

#ifndef HAVE_SPINLOCKS
extern void SpinlockSemaInit(PGSemaphore);
extern PGSemaphore SpinlockSemaArray;
#endif

#endif   /* SPIN_H */

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Editing: spin.h

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