1 files changed, 51 insertions, 0 deletions

diff --git a/include/linux/semaphore.h b/include/linux/semaphore.h
new file mode 100644
index 000000000000..9cae64b00d6b
--- /dev/null
+++ b/include/linux/semaphore.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2008 Intel Corporation
+ * Author: Matthew Wilcox <willy@linux.intel.com>
+ *
+ * Distributed under the terms of the GNU GPL, version 2
+ *
+ * Please see kernel/semaphore.c for documentation of these functions
+ */
+#ifndef __LINUX_SEMAPHORE_H
+#define __LINUX_SEMAPHORE_H
+
+#include <linux/list.h>
+#include <linux/spinlock.h>
+
+/* Please don't access any members of this structure directly */
+struct semaphore {
+        spinlock_t              lock;
+        unsigned int            count;
+        struct list_head        wait_list;
+};
+
+#define __SEMAPHORE_INITIALIZER(name, n)                                \
+{                                                                       \
+        .lock           = __SPIN_LOCK_UNLOCKED((name).lock),            \
+        .count          = n,                                            \
+        .wait_list      = LIST_HEAD_INIT((name).wait_list),             \
+}
+
+#define __DECLARE_SEMAPHORE_GENERIC(name, count) \
+        struct semaphore name = __SEMAPHORE_INITIALIZER(name, count)
+
+#define DECLARE_MUTEX(name)     __DECLARE_SEMAPHORE_GENERIC(name, 1)
+
+static inline void sema_init(struct semaphore *sem, int val)
+{
+        static struct lock_class_key __key;
+        *sem = (struct semaphore) __SEMAPHORE_INITIALIZER(*sem, val);
+        lockdep_init_map(&sem->lock.dep_map, "semaphore->lock", &__key, 0);
+}
+
+#define init_MUTEX(sem)         sema_init(sem, 1)
+#define init_MUTEX_LOCKED(sem)  sema_init(sem, 0)
+
+extern void down(struct semaphore *sem);
+extern int __must_check down_interruptible(struct semaphore *sem);
+extern int __must_check down_killable(struct semaphore *sem);
+extern int __must_check down_trylock(struct semaphore *sem);
+extern int __must_check down_timeout(struct semaphore *sem, long jiffies);
+extern void up(struct semaphore *sem);
+
+#endif /* __LINUX_SEMAPHORE_H */