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-rw-r--r--include/asm-sh/semaphore-helper.h89
1 files changed, 89 insertions, 0 deletions
diff --git a/include/asm-sh/semaphore-helper.h b/include/asm-sh/semaphore-helper.h
new file mode 100644
index 000000000000..bd8230c369ca
--- /dev/null
+++ b/include/asm-sh/semaphore-helper.h
@@ -0,0 +1,89 @@
+#ifndef __ASM_SH_SEMAPHORE_HELPER_H
+#define __ASM_SH_SEMAPHORE_HELPER_H
+
+/*
+ * SMP- and interrupt-safe semaphores helper functions.
+ *
+ * (C) Copyright 1996 Linus Torvalds
+ * (C) Copyright 1999 Andrea Arcangeli
+ */
+
+/*
+ * These two _must_ execute atomically wrt each other.
+ *
+ * This is trivially done with load_locked/store_cond,
+ * which we have. Let the rest of the losers suck eggs.
+ */
+static __inline__ void wake_one_more(struct semaphore * sem)
+{
+ atomic_inc((atomic_t *)&sem->sleepers);
+}
+
+static __inline__ int waking_non_zero(struct semaphore *sem)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&semaphore_wake_lock, flags);
+ if (sem->sleepers > 0) {
+ sem->sleepers--;
+ ret = 1;
+ }
+ spin_unlock_irqrestore(&semaphore_wake_lock, flags);
+ return ret;
+}
+
+/*
+ * waking_non_zero_interruptible:
+ * 1 got the lock
+ * 0 go to sleep
+ * -EINTR interrupted
+ *
+ * We must undo the sem->count down_interruptible() increment while we are
+ * protected by the spinlock in order to make atomic this atomic_inc() with the
+ * atomic_read() in wake_one_more(), otherwise we can race. -arca
+ */
+static __inline__ int waking_non_zero_interruptible(struct semaphore *sem,
+ struct task_struct *tsk)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ spin_lock_irqsave(&semaphore_wake_lock, flags);
+ if (sem->sleepers > 0) {
+ sem->sleepers--;
+ ret = 1;
+ } else if (signal_pending(tsk)) {
+ atomic_inc(&sem->count);
+ ret = -EINTR;
+ }
+ spin_unlock_irqrestore(&semaphore_wake_lock, flags);
+ return ret;
+}
+
+/*
+ * waking_non_zero_trylock:
+ * 1 failed to lock
+ * 0 got the lock
+ *
+ * We must undo the sem->count down_trylock() increment while we are
+ * protected by the spinlock in order to make atomic this atomic_inc() with the
+ * atomic_read() in wake_one_more(), otherwise we can race. -arca
+ */
+static __inline__ int waking_non_zero_trylock(struct semaphore *sem)
+{
+ unsigned long flags;
+ int ret = 1;
+
+ spin_lock_irqsave(&semaphore_wake_lock, flags);
+ if (sem->sleepers <= 0)
+ atomic_inc(&sem->count);
+ else {
+ sem->sleepers--;
+ ret = 0;
+ }
+ spin_unlock_irqrestore(&semaphore_wake_lock, flags);
+ return ret;
+}
+
+#endif /* __ASM_SH_SEMAPHORE_HELPER_H */