patch-2.2.14 linux/include/asm-s390/semaphore.h

• Lines: 74
• Date: Tue Jan 4 10:12:24 2000
• Orig file: v2.2.13/linux/include/asm-s390/semaphore.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.13/linux/include/asm-s390/semaphore.h linux/include/asm-s390/semaphore.h
@@ -0,0 +1,73 @@
+/*
+ *  include/asm-s390/semaphore.h
+ *
+ *  S390 version
+ *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *
+ *  Derived from "include/asm-i386/semaphore.h"
+ *    (C) Copyright 1996 Linus Torvalds
+ */
+
+#ifndef _S390_SEMAPHORE_H
+#define _S390_SEMAPHORE_H
+
+#include <linux/linkage.h>
+
+#include <asm/system.h>
+#include <asm/atomic.h>
+#include <asm/spinlock.h>
+
+struct semaphore {
+        atomic_t count;
+        int waking;
+        struct wait_queue * wait;
+};
+
+#define MUTEX ((struct semaphore) { ATOMIC_INIT(1), 0, NULL })
+#define MUTEX_LOCKED ((struct semaphore) { ATOMIC_INIT(0), 0, NULL })
+
+asmlinkage void __down_failed(void /* special register calling convention */);
+asmlinkage int  __down_failed_interruptible(void  /* params in registers */);
+asmlinkage int  __down_failed_trylock(void  /* params in registers */);
+asmlinkage void __up_wakeup(void /* special register calling convention */);
+
+asmlinkage void __down(struct semaphore * sem);
+asmlinkage int  __down_interruptible(struct semaphore * sem);
+asmlinkage int  __down_trylock(struct semaphore * sem);
+asmlinkage void __up(struct semaphore * sem);
+
+extern spinlock_t semaphore_wake_lock;
+
+#define sema_init(sem, val)     atomic_set(&((sem)->count), (val))
+
+extern inline void down(struct semaphore * sem)
+{
+	if (atomic_dec_return(&sem->count) < 0)
+		__down(sem);
+}
+
+extern inline int down_interruptible(struct semaphore * sem)
+{
+	int ret = 0;
+
+	if (atomic_dec_return(&sem->count) < 0)
+		ret = __down_interruptible(sem);
+	return ret;
+}
+
+extern inline int down_trylock(struct semaphore * sem)
+{
+        int ret = 0;
+
+        if (atomic_dec_return(&sem->count) < 0)
+                ret = __down_trylock(sem);
+        return ret;
+}
+
+extern inline void up(struct semaphore * sem)
+{
+	if (atomic_inc_return(&sem->count) <= 0)
+		__up(sem);
+}
+
+#endif