blob: 32037684ec151e890f21c0bba9fcc8f702271f2a (
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
|
/*-------------------------------------------------------------------------
*
* spin.h--
* synchronization routines
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: spin.h,v 1.1.1.1 1996/07/09 06:21:53 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef SPIN_H
#define SPIN_H
#include "ipc.h"
/*
* two implementations of spin locks
*
* sequent, sparc, sun3: real spin locks. uses a TAS instruction; see
* src/storage/ipc/s_lock.c for details.
*
* default: fake spin locks using semaphores. see spin.c
*
*/
typedef int SPINLOCK;
extern bool CreateSpinlocks(IPCKey key);
extern bool AttachSpinLocks(IPCKey key);
extern bool InitSpinLocks(int init, IPCKey key);
extern void SpinAcquire(SPINLOCK lock);
extern void SpinRelease(SPINLOCK lock);
extern bool SpinIsLocked(SPINLOCK lock);
#endif /* SPIN_H */
|
