This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / linux / rtmutex.h

diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h
new file mode 100644 (file)
index 0000000..5d41dee
--- /dev/null
+++ b/include/linux/rtmutex.h
@@ -0,0 +1,107 @@
+/*
+ * RT Mutexes: blocking mutual exclusion locks with PI support
+ *
+ * started by Ingo Molnar and Thomas Gleixner:
+ *
+ *  Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ *  Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
+ *
+ * This file contains the public data structure and API definitions.
+ */
+
+#ifndef __LINUX_RT_MUTEX_H
+#define __LINUX_RT_MUTEX_H
+
+#include <linux/linkage.h>
+#include <linux/plist.h>
+#include <linux/spinlock_types.h>
+
+/*
+ * The rt_mutex structure
+ *
+ * @wait_lock: spinlock to protect the structure
+ * @wait_list: pilist head to enqueue waiters in priority order
+ * @owner:     the mutex owner
+ */
+struct rt_mutex {
+       spinlock_t              wait_lock;
+       struct plist_head       wait_list;
+       struct task_struct      *owner;
+#ifdef CONFIG_DEBUG_RT_MUTEXES
+       int                     save_state;
+       const char              *name, *file;
+       int                     line;
+       void                    *magic;
+#endif
+};
+
+struct rt_mutex_waiter;
+struct hrtimer_sleeper;
+
+#ifdef CONFIG_DEBUG_RT_MUTEXES
+ extern int rt_mutex_debug_check_no_locks_freed(const void *from,
+                                               unsigned long len);
+ extern void rt_mutex_debug_check_no_locks_held(struct task_struct *task);
+#else
+ static inline int rt_mutex_debug_check_no_locks_freed(const void *from,
+                                                      unsigned long len)
+ {
+       return 0;
+ }
+# define rt_mutex_debug_check_no_locks_held(task)      do { } while (0)
+#endif
+
+#ifdef CONFIG_DEBUG_RT_MUTEXES
+# define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \
+       , .name = #mutexname, .file = __FILE__, .line = __LINE__
+# define rt_mutex_init(mutex)                  __rt_mutex_init(mutex, __FUNCTION__)
+ extern void rt_mutex_debug_task_free(struct task_struct *tsk);
+#else
+# define __DEBUG_RT_MUTEX_INITIALIZER(mutexname)
+# define rt_mutex_init(mutex)                  __rt_mutex_init(mutex, NULL)
+# define rt_mutex_debug_task_free(t)                   do { } while (0)
+#endif
+
+#define __RT_MUTEX_INITIALIZER(mutexname) \
+       { .wait_lock = SPIN_LOCK_UNLOCKED \
+       , .wait_list = PLIST_HEAD_INIT(mutexname.wait_list, mutexname.wait_lock) \
+       , .owner = NULL \
+       __DEBUG_RT_MUTEX_INITIALIZER(mutexname)}
+
+#define DEFINE_RT_MUTEX(mutexname) \
+       struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname)
+
+/***
+ * rt_mutex_is_locked - is the mutex locked
+ * @lock: the mutex to be queried
+ *
+ * Returns 1 if the mutex is locked, 0 if unlocked.
+ */
+static inline int rt_mutex_is_locked(struct rt_mutex *lock)
+{
+       return lock->owner != NULL;
+}
+
+extern void __rt_mutex_init(struct rt_mutex *lock, const char *name);
+extern void rt_mutex_destroy(struct rt_mutex *lock);
+
+extern void rt_mutex_lock(struct rt_mutex *lock);
+extern int rt_mutex_lock_interruptible(struct rt_mutex *lock,
+                                               int detect_deadlock);
+extern int rt_mutex_timed_lock(struct rt_mutex *lock,
+                                       struct hrtimer_sleeper *timeout,
+                                       int detect_deadlock);
+
+extern int rt_mutex_trylock(struct rt_mutex *lock);
+
+extern void rt_mutex_unlock(struct rt_mutex *lock);
+
+#ifdef CONFIG_RT_MUTEXES
+# define INIT_RT_MUTEXES(tsk)                                          \
+       .pi_waiters     = PLIST_HEAD_INIT(tsk.pi_waiters, tsk.pi_lock), \
+       INIT_RT_MUTEX_DEBUG(tsk)
+#else
+# define INIT_RT_MUTEXES(tsk)
+#endif
+
+#endif