Copyright 1999-2001, Be Incorporated. All Rights Reserved.
This file may be used under the terms of the Be Sample Code License.
*/
#ifndef _LOCK_H
#define _LOCK_H
#include <BeBuild.h>
#include <OS.h>
#ifdef __cplusplus
extern "C" {
#else
typedef struct lock lock;
typedef struct mlock mlock;
#endif
struct lock {
sem_id s;
long c;
};
struct mlock {
sem_id s;
};
extern _IMPEXP_KERNEL int new_lock(lock *l, const char *name);
extern _IMPEXP_KERNEL int free_lock(lock *l);
#define LOCK(l) if (atomic_add(&l.c, -1) <= 0) acquire_sem(l.s);
#define UNLOCK(l) if (atomic_add(&l.c, 1) < 0) release_sem(l.s);
extern _IMPEXP_KERNEL int new_mlock(mlock *l, long c, const char *name);
extern _IMPEXP_KERNEL int free_mlock(mlock *l);
#define LOCKM(l,cnt) acquire_sem_etc(l.s, cnt, 0, 0)
#define UNLOCKM(l,cnt) release_sem_etc(l.s, cnt, 0)
#ifdef __cplusplus
}
#endif
#endif
