patch-2.4.7 linux/include/asm-alpha/rwsem.h

• Lines: 209
• Date: Tue Jul 10 20:08:51 2001
• Orig file: v2.4.6/linux/include/asm-alpha/rwsem.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.6/linux/include/asm-alpha/rwsem.h linux/include/asm-alpha/rwsem.h
@@ -0,0 +1,208 @@
+#ifndef _ALPHA_RWSEM_H
+#define _ALPHA_RWSEM_H
+
+/*
+ * Written by Ivan Kokshaysky <ink@jurassic.park.msu.ru>, 2001.
+ * Based on asm-alpha/semaphore.h and asm-i386/rwsem.h
+ */
+
+#ifndef _LINUX_RWSEM_H
+#error please dont include asm/rwsem.h directly, use linux/rwsem.h instead
+#endif
+
+#ifdef __KERNEL__
+
+#include <asm/compiler.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+
+struct rwsem_waiter;
+
+extern struct rw_semaphore *rwsem_down_read_failed(struct rw_semaphore *sem);
+extern struct rw_semaphore *rwsem_down_write_failed(struct rw_semaphore *sem);
+extern struct rw_semaphore *rwsem_wake(struct rw_semaphore *);
+
+/*
+ * the semaphore definition
+ */
+struct rw_semaphore {
+	long			count;
+#define RWSEM_UNLOCKED_VALUE		0x0000000000000000L
+#define RWSEM_ACTIVE_BIAS		0x0000000000000001L
+#define RWSEM_ACTIVE_MASK		0x00000000ffffffffL
+#define RWSEM_WAITING_BIAS		(-0x0000000100000000L)
+#define RWSEM_ACTIVE_READ_BIAS		RWSEM_ACTIVE_BIAS
+#define RWSEM_ACTIVE_WRITE_BIAS		(RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
+	spinlock_t		wait_lock;
+	struct list_head	wait_list;
+#if RWSEM_DEBUG
+	int			debug;
+#endif
+};
+
+#if RWSEM_DEBUG
+#define __RWSEM_DEBUG_INIT      , 0
+#else
+#define __RWSEM_DEBUG_INIT	/* */
+#endif
+
+#define __RWSEM_INITIALIZER(name) \
+	{ RWSEM_UNLOCKED_VALUE, SPIN_LOCK_UNLOCKED, \
+	LIST_HEAD_INIT((name).wait_list) __RWSEM_DEBUG_INIT }
+
+#define DECLARE_RWSEM(name) \
+	struct rw_semaphore name = __RWSEM_INITIALIZER(name)
+
+static inline void init_rwsem(struct rw_semaphore *sem)
+{
+	sem->count = RWSEM_UNLOCKED_VALUE;
+	spin_lock_init(&sem->wait_lock);
+	INIT_LIST_HEAD(&sem->wait_list);
+#if RWSEM_DEBUG
+	sem->debug = 0;
+#endif
+}
+
+static inline void __down_read(struct rw_semaphore *sem)
+{
+	long oldcount;
+#ifndef	CONFIG_SMP
+	oldcount = sem->count;
+	sem->count += RWSEM_ACTIVE_READ_BIAS;
+#else
+	long temp;
+	__asm__ __volatile__(
+	"1:	ldq_l	%0,%1\n"
+	"	addq	%0,%3,%2\n"
+	"	stq_c	%2,%1\n"
+	"	beq	%2,2f\n"
+	"	mb\n"
+	".subsection 2\n"
+	"2:	br	1b\n"
+	".previous"
+	:"=&r" (oldcount), "=m" (sem->count), "=&r" (temp)
+	:"Ir" (RWSEM_ACTIVE_READ_BIAS), "m" (sem->count) : "memory");
+#endif
+	if (__builtin_expect(oldcount < 0, 0))
+		rwsem_down_read_failed(sem);
+}
+
+static inline void __down_write(struct rw_semaphore *sem)
+{
+	long oldcount;
+#ifndef	CONFIG_SMP
+	oldcount = sem->count;
+	sem->count += RWSEM_ACTIVE_WRITE_BIAS;
+#else
+	long temp;
+	__asm__ __volatile__(
+	"1:	ldq_l	%0,%1\n"
+	"	addq	%0,%3,%2\n"
+	"	stq_c	%2,%1\n"
+	"	beq	%2,2f\n"
+	"	mb\n"
+	".subsection 2\n"
+	"2:	br	1b\n"
+	".previous"
+	:"=&r" (oldcount), "=m" (sem->count), "=&r" (temp)
+	:"Ir" (RWSEM_ACTIVE_WRITE_BIAS), "m" (sem->count) : "memory");
+#endif
+	if (__builtin_expect(oldcount, 0))
+		rwsem_down_write_failed(sem);
+}
+
+static inline void __up_read(struct rw_semaphore *sem)
+{
+	long oldcount;
+#ifndef	CONFIG_SMP
+	oldcount = sem->count;
+	sem->count -= RWSEM_ACTIVE_READ_BIAS;
+#else
+	long temp;
+	__asm__ __volatile__(
+	"	mb\n"
+	"1:	ldq_l	%0,%1\n"
+	"	subq	%0,%3,%2\n"
+	"	stq_c	%2,%1\n"
+	"	beq	%2,2f\n"
+	".subsection 2\n"
+	"2:	br	1b\n"
+	".previous"
+	:"=&r" (oldcount), "=m" (sem->count), "=&r" (temp)
+	:"Ir" (RWSEM_ACTIVE_READ_BIAS), "m" (sem->count) : "memory");
+#endif
+	if (__builtin_expect(oldcount < 0, 0)) 
+		if ((int)oldcount - RWSEM_ACTIVE_READ_BIAS == 0)
+			rwsem_wake(sem);
+}
+
+static inline void __up_write(struct rw_semaphore *sem)
+{
+	long count;
+#ifndef	CONFIG_SMP
+	sem->count -= RWSEM_ACTIVE_WRITE_BIAS;
+	count = sem->count;
+#else
+	long temp;
+	__asm__ __volatile__(
+	"	mb\n"
+	"1:	ldq_l	%0,%1\n"
+	"	subq	%0,%3,%2\n"
+	"	stq_c	%2,%1\n"
+	"	beq	%2,2f\n"
+	"	subq	%0,%3,%0\n"
+	".subsection 2\n"
+	"2:	br	1b\n"
+	".previous"
+	:"=&r" (count), "=m" (sem->count), "=&r" (temp)
+	:"Ir" (RWSEM_ACTIVE_WRITE_BIAS), "m" (sem->count) : "memory");
+#endif
+	if (__builtin_expect(count, 0))
+		if ((int)count == 0)
+			rwsem_wake(sem);
+}
+
+static inline void rwsem_atomic_add(long val, struct rw_semaphore *sem)
+{
+#ifndef	CONFIG_SMP
+	sem->count += val;
+#else
+	long temp;
+	__asm__ __volatile__(
+	"1:	ldq_l	%0,%1\n"
+	"	addq	%0,%2,%0\n"
+	"	stq_c	%0,%1\n"
+	"	beq	%0,2f\n"
+	".subsection 2\n"
+	"2:	br	1b\n"
+	".previous"
+	:"=&r" (temp), "=m" (sem->count)
+	:"Ir" (val), "m" (sem->count));
+#endif
+}
+
+static inline long rwsem_atomic_update(long val, struct rw_semaphore *sem)
+{
+#ifndef	CONFIG_SMP
+	sem->count += val;
+	return sem->count;
+#else
+	long ret, temp;
+	__asm__ __volatile__(
+	"1:	ldq_l	%0,%1\n"
+	"	addq 	%0,%3,%2\n"
+	"	addq	%0,%3,%0\n"
+	"	stq_c	%2,%1\n"
+	"	beq	%2,2f\n"
+	".subsection 2\n"
+	"2:	br	1b\n"
+	".previous"
+	:"=&r" (ret), "=m" (sem->count), "=&r" (temp)
+	:"Ir" (val), "m" (sem->count));
+
+	return ret;
+#endif
+}
+
+#endif /* __KERNEL__ */
+#endif /* _ALPHA_RWSEM_H */