blob: 1d488e547672385e00e75ac06d9ce9d3ba150168 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
/*-------------------------------------------------------------------------
*
* spin.h
* synchronization routines
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: spin.h,v 1.15 2001/03/22 04:01:09 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef SPIN_H
#define SPIN_H
#include "storage/ipc.h"
/*
* two implementations of spin locks
*
* Where TAS instruction is available: real spin locks.
* See src/storage/ipc/s_lock.c for details.
*
* Otherwise: fake spin locks using semaphores. see spin.c
*/
typedef int SPINLOCK;
#ifdef LOCK_DEBUG
extern bool Trace_spinlocks;
#endif
extern int SLockShmemSize(void);
extern void CreateSpinlocks(PGShmemHeader *seghdr);
extern void SpinAcquire(SPINLOCK lockid);
extern void SpinRelease(SPINLOCK lockid);
#endif /* SPIN_H */
|
