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 USERLAND_FS_BEOS_LOCK_H 7 #define USERLAND_FS_BEOS_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 beos_lock beos_lock; 21 typedef struct beos_mlock beos_mlock; 22 #endif 23 24 25 struct beos_lock { 26 sem_id s; 27 long c; 28 }; 29 30 struct beos_mlock { 31 sem_id s; 32 }; 33 34 extern _IMPEXP_KERNEL int beos_new_lock(beos_lock *l, const char *name); 35 extern _IMPEXP_KERNEL int beos_free_lock(beos_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 44 extern _IMPEXP_KERNEL int beos_new_mlock(beos_mlock *l, long c, const char *name); 45 extern _IMPEXP_KERNEL int beos_free_mlock(beos_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