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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /include/linux/rtmutex.h
Initial import
Diffstat (limited to 'include/linux/rtmutex.h')
-rw-r--r--include/linux/rtmutex.h101
1 files changed, 101 insertions, 0 deletions
diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h
new file mode 100644
index 000000000..1abba5ce2
--- /dev/null
+++ b/include/linux/rtmutex.h
@@ -0,0 +1,101 @@
+/*
+ * 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/rbtree.h>
+#include <linux/spinlock_types.h>
+
+extern int max_lock_depth; /* for sysctl */
+
+/**
+ * The rt_mutex structure
+ *
+ * @wait_lock: spinlock to protect the structure
+ * @waiters: rbtree root to enqueue waiters in priority order
+ * @waiters_leftmost: top waiter
+ * @owner: the mutex owner
+ */
+struct rt_mutex {
+ raw_spinlock_t wait_lock;
+ struct rb_root waiters;
+ struct rb_node *waiters_leftmost;
+ 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, __func__)
+ 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 = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
+ , .waiters = RB_ROOT \
+ , .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);
+extern int rt_mutex_timed_lock(struct rt_mutex *lock,
+ struct hrtimer_sleeper *timeout);
+
+extern int rt_mutex_trylock(struct rt_mutex *lock);
+
+extern void rt_mutex_unlock(struct rt_mutex *lock);
+
+#endif