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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 : 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!
 *
 *	CAUTION: Care must be taken to ensure that loads and stores of
 *	shared memory values are not rearranged around spinlock acquire
 *	and release. This is done using the "volatile" qualifier: the C
 *	standard states that loads and stores of volatile objects cannot
 *	be rearranged *with respect to other volatile objects*. The
 *	spinlock is always written through a volatile pointer by the
 *	spinlock macros, but this is not sufficient by itself: code that
 *	protects shared data with a spinlock MUST reference that shared
 *	data through a volatile pointer.
 *
 *	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) 1996-2012, 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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Code Editor : spin.h