patch-2.4.4 linux/include/asm-sh/semaphore.h

• Lines: 160
• Date: Tue Apr 17 17:19:31 2001
• Orig file: v2.4.3/linux/include/asm-sh/semaphore.h
• Orig date: Sun Mar 5 09:33:55 2000

diff -u --recursive --new-file v2.4.3/linux/include/asm-sh/semaphore.h linux/include/asm-sh/semaphore.h
@@ -13,6 +13,7 @@
  */
 
 #include <linux/spinlock.h>
+#include <linux/rwsem.h>
 
 #include <asm/system.h>
 #include <asm/atomic.h>
@@ -134,151 +135,6 @@
 #endif
 	if (atomic_inc_return(&sem->count) <= 0)
 		__up(sem);
-}
-
-/* rw mutexes (should that be mutices? =) -- throw rw
- * spinlocks and semaphores together, and this is what we
- * end up with...
- *
- * SuperH version by Niibe Yutaka
- */
-struct rw_semaphore {
-	atomic_t		count;
-	volatile unsigned char	write_bias_granted;
-	volatile unsigned char	read_bias_granted;
-	volatile unsigned char	pad1;
-	volatile unsigned char	pad2;
-	wait_queue_head_t	wait;
-	wait_queue_head_t	write_bias_wait;
-#if WAITQUEUE_DEBUG
-	long			__magic;
-	atomic_t		readers;
-	atomic_t		writers;
-#endif
-};
-
-#define RW_LOCK_BIAS		 0x01000000
-
-#if WAITQUEUE_DEBUG
-#define __RWSEM_DEBUG_INIT	, ATOMIC_INIT(0), ATOMIC_INIT(0)
-#else
-#define __RWSEM_DEBUG_INIT	/* */
-#endif
-
-#define __RWSEM_INITIALIZER(name,count) \
-{ ATOMIC_INIT(count), 0, 0, 0, 0, __WAIT_QUEUE_HEAD_INITIALIZER((name).wait), \
-	__WAIT_QUEUE_HEAD_INITIALIZER((name).write_bias_wait) \
-	__SEM_DEBUG_INIT(name) __RWSEM_DEBUG_INIT }
-
-#define __DECLARE_RWSEM_GENERIC(name,count) \
-	struct rw_semaphore name = __RWSEM_INITIALIZER(name,count)
-
-#define DECLARE_RWSEM(name) __DECLARE_RWSEM_GENERIC(name,RW_LOCK_BIAS)
-#define DECLARE_RWSEM_READ_LOCKED(name) __DECLARE_RWSEM_GENERIC(name,RW_LOCK_BIAS-1)
-#define DECLARE_RWSEM_WRITE_LOCKED(name) __DECLARE_RWSEM_GENERIC(name,0)
-
-extern inline void init_rwsem(struct rw_semaphore *sem)
-{
-	atomic_set(&sem->count, RW_LOCK_BIAS);
-	sem->read_bias_granted = 0;
-	sem->write_bias_granted = 0;
-	init_waitqueue_head(&sem->wait);
-	init_waitqueue_head(&sem->write_bias_wait);
-#if WAITQUEUE_DEBUG
-	sem->__magic = (long)&sem->__magic;
-	atomic_set(&sem->readers, 0);
-	atomic_set(&sem->writers, 0);
-#endif
-}
-
-extern inline void down_read(struct rw_semaphore *sem)
-{
-	int saved = atomic_read(&sem->count), new;
-#if WAITQUEUE_DEBUG
-	if (sem->__magic != (long)&sem->__magic)
-		BUG();
-#endif
-	if ((new = atomic_dec_return(&sem->count)) < 0)
-		__down_read(sem, (new < 0 && saved >=0));
-#if WAITQUEUE_DEBUG
-	if (sem->write_bias_granted)
-		BUG();
-	if (atomic_read(&sem->writers))
-		BUG();
-	atomic_inc(&sem->readers);
-#endif
-}
-
-extern inline void down_write(struct rw_semaphore *sem)
-{
-	int saved = atomic_read(&sem->count), new;
-#if WAITQUEUE_DEBUG
-	if (sem->__magic != (long)&sem->__magic)
-		BUG();
-#endif
-	if ((new = atomic_sub_return(RW_LOCK_BIAS, &sem->count)) != 0)
-		__down_write(sem, (new < 0 && saved >=0));
-#if WAITQUEUE_DEBUG
-	if (atomic_read(&sem->writers))
-		BUG();
-	if (atomic_read(&sem->readers))
-		BUG();
-	if (sem->read_bias_granted)
-		BUG();
-	if (sem->write_bias_granted)
-		BUG();
-	atomic_inc(&sem->writers);
-#endif
-}
-
-/* When a reader does a release, the only significant
- * case is when there was a writer waiting, and we've
- * bumped the count to 0: we must wake the writer up.
- */
-extern inline void __up_read(struct rw_semaphore *sem)
-{
-	if (atomic_inc_return(&sem->count) == 0)
-		__rwsem_wake(sem);
-}
-
-/* releasing the writer is easy -- just release it and
- * wake up any sleepers.
- */
-extern inline void __up_write(struct rw_semaphore *sem)
-{
-	int saved = atomic_read(&sem->count), new;
-
-	new = atomic_add_return(RW_LOCK_BIAS, &sem->count);
-	if (saved < 0 && new >= 0)
-		__rwsem_wake(sem);
-}
-
-extern inline void up_read(struct rw_semaphore *sem)
-{
-#if WAITQUEUE_DEBUG
-	if (sem->write_bias_granted)
-		BUG();
-	if (atomic_read(&sem->writers))
-		BUG();
-	atomic_dec(&sem->readers);
-#endif
-	__up_read(sem);
-}
-
-extern inline void up_write(struct rw_semaphore *sem)
-{
-#if WAITQUEUE_DEBUG
-	if (sem->read_bias_granted)
-		BUG();
-	if (sem->write_bias_granted)
-		BUG();
-	if (atomic_read(&sem->readers))
-		BUG();
-	if (atomic_read(&sem->writers) != 1)
-		BUG();
-	atomic_dec(&sem->writers);
-#endif
-	__up_write(sem);
 }
 
 #endif /* __ASM_SH_SEMAPHORE_H */