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#ifdef __cplusplus 14 extern "C" { 15#else 16 typedef struct lock lock; 17 typedef struct mlock mlock; 18#endif 19 20 21struct lock { 22 sem_id s; 23 long c; 24}; 25 26struct mlock { 27 sem_id s; 28}; 29 30extern _IMPEXP_KERNEL int new_lock(lock *l, const char *name); 31extern _IMPEXP_KERNEL int free_lock(lock *l); 32 33#define LOCK(l) if (atomic_add(&l.c, -1) <= 0) acquire_sem(l.s); 34#define UNLOCK(l) if (atomic_add(&l.c, 1) < 0) release_sem(l.s); 35 36extern _IMPEXP_KERNEL int new_mlock(mlock *l, long c, const char *name); 37extern _IMPEXP_KERNEL int free_mlock(mlock *l); 38 39#define LOCKM(l,cnt) acquire_sem_etc(l.s, cnt, 0, 0) 40#define UNLOCKM(l,cnt) release_sem_etc(l.s, cnt, 0) 41 42 43#ifdef __cplusplus 44 } // extern "C" 45#endif 46 47#endif 48