1/* 2 Copyright 1999-2001, Be Incorporated. All Rights Reserved. 3 This file may be used under the terms of the Be Sample Code License. 4*/ 5 6#ifndef _LOCK_H 7#define _LOCK_H 8 9#include <BeBuild.h> 10 11#include <OS.h> 12 13#ifndef _IMPEXP_KERNEL 14#define _IMPEXP_KERNEL 15#endif 16 17#ifdef __cplusplus 18 extern "C" { 19#else 20 typedef struct lock lock; 21 typedef struct mlock mlock; 22#endif 23 24 25struct lock { 26 sem_id s; 27 long c; 28}; 29 30struct mlock { 31 sem_id s; 32}; 33 34extern _IMPEXP_KERNEL int new_lock(lock *l, const char *name); 35extern _IMPEXP_KERNEL int free_lock(lock *l); 36 37#ifdef LOCK 38#undef LOCK 39#endif 40 41#define LOCK(l) if (atomic_add(&l.c, -1) <= 0) acquire_sem(l.s); 42#define UNLOCK(l) if (atomic_add(&l.c, 1) < 0) release_sem(l.s); 43 44extern _IMPEXP_KERNEL int new_mlock(mlock *l, long c, const char *name); 45extern _IMPEXP_KERNEL int free_mlock(mlock *l); 46 47#define LOCKM(l,cnt) acquire_sem_etc(l.s, cnt, 0, 0) 48#define UNLOCKM(l,cnt) release_sem_etc(l.s, cnt, 0) 49 50 51#ifdef __cplusplus 52 } // extern "C" 53#endif 54 55#endif 56