120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/*
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* Copyright 2002-2008, Axel Dörfler, axeld@pinc-software.de.
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* Distributed under the terms of the MIT License.
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*
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* Copyright 2001-2002, Travis Geiselbrecht. All rights reserved.
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* Distributed under the terms of the NewOS License.
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*/
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#ifndef _KERNEL_LOCK_H
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#define _KERNEL_LOCK_H
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#include <OS.h>
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#include <debug.h>
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typedef struct recursive_lock {
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sem_id sem;
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thread_id holder;
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int recursion;
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} recursive_lock;
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typedef struct mutex {
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sem_id sem;
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thread_id holder;
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} mutex;
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typedef struct benaphore {
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sem_id sem;
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int32 count;
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} benaphore;
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// Note: this is currently a trivial r/w lock implementation
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// it will be replaced with something better later - this
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// or a similar API will be made publically available at this point.
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typedef struct rw_lock {
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sem_id sem;
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int32 count;
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benaphore writeLock;
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} rw_lock;
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#define RW_MAX_READERS 1000000
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#if 0 && KDEBUG // XXX disable this for now, it causes problems when including thread.h here
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# include <thread.h>
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#define ASSERT_LOCKED_RECURSIVE(r) { ASSERT(thread_get_current_thread_id() == (r)->holder); }
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#define ASSERT_LOCKED_MUTEX(m) { ASSERT(thread_get_current_thread_id() == (m)->holder); }
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#else
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#define ASSERT_LOCKED_RECURSIVE(r)
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#define ASSERT_LOCKED_MUTEX(m)
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern status_t recursive_lock_init(recursive_lock *lock, const char *name);
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extern void recursive_lock_destroy(recursive_lock *lock);
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extern status_t recursive_lock_lock(recursive_lock *lock);
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extern void recursive_lock_unlock(recursive_lock *lock);
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extern int32 recursive_lock_get_recursion(recursive_lock *lock);
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extern status_t mutex_init(mutex *m, const char *name);
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extern void mutex_destroy(mutex *m);
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extern status_t mutex_trylock(mutex *mutex);
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extern status_t mutex_lock(mutex *m);
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extern void mutex_unlock(mutex *m);
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extern status_t benaphore_init(benaphore *ben, const char *name);
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extern void benaphore_destroy(benaphore *ben);
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static inline status_t
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benaphore_lock_etc(benaphore *ben, uint32 flags, bigtime_t timeout)
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{
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if (atomic_add(&ben->count, -1) <= 0)
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return acquire_sem_etc(ben->sem, 1, flags, timeout);
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return B_OK;
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}
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static inline status_t
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benaphore_lock(benaphore *ben)
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{
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#ifdef KDEBUG
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return acquire_sem(ben->sem);
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#else
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if (atomic_add(&ben->count, -1) <= 0)
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return acquire_sem(ben->sem);
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return B_OK;
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#endif
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}
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static inline status_t
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benaphore_unlock(benaphore *ben)
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{
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#ifdef KDEBUG
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return release_sem(ben->sem);
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#else
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if (atomic_add(&ben->count, 1) < 0)
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return release_sem(ben->sem);
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return B_OK;
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#endif
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}
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extern status_t rw_lock_init(rw_lock *lock, const char *name);
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extern void rw_lock_destroy(rw_lock *lock);
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extern status_t rw_lock_read_lock(rw_lock *lock);
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extern status_t rw_lock_read_unlock(rw_lock *lock);
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extern status_t rw_lock_write_lock(rw_lock *lock);
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extern status_t rw_lock_write_unlock(rw_lock *lock);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _KERNEL_LOCK_H */
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