1 files changed, 81 insertions, 0 deletions

diff --git a/include/asm-cris/semaphore-helper.h b/include/asm-cris/semaphore-helper.h
new file mode 100644
index 000000000000..dbd0f30b85b6
--- /dev/null
+++ b/include/asm-cris/semaphore-helper.h
@@ -0,0 +1,81 @@
+/* $Id: semaphore-helper.h,v 1.3 2001/03/26 15:00:33 orjanf Exp $
+ *
+ * SMP- and interrupt-safe semaphores helper functions. Generic versions, no
+ * optimizations whatsoever... 
+ *
+ */
+
+#ifndef _ASM_SEMAPHORE_HELPER_H
+#define _ASM_SEMAPHORE_HELPER_H
+
+#include <asm/atomic.h>
+#include <linux/errno.h>
+
+#define read(a) ((a)->counter)
+#define inc(a) (((a)->counter)++)
+#define dec(a) (((a)->counter)--)
+
+#define count_inc(a) ((*(a))++)
+
+/*
+ * These two _must_ execute atomically wrt each other.
+ */
+extern inline void wake_one_more(struct semaphore * sem)
+{
+        atomic_inc(&sem->waking);
+}
+
+extern inline int waking_non_zero(struct semaphore *sem)
+{
+        unsigned long flags;
+        int ret = 0;
+
+        local_save_flags(flags);
+        local_irq_disable();
+        if (read(&sem->waking) > 0) {
+                dec(&sem->waking);
+                ret = 1;
+        }
+        local_irq_restore(flags);
+        return ret;
+}
+
+extern inline int waking_non_zero_interruptible(struct semaphore *sem,
+                                                struct task_struct *tsk)
+{
+        int ret = 0;
+        unsigned long flags;
+
+        local_save_flags(flags);
+        local_irq_disable();
+        if (read(&sem->waking) > 0) {
+                dec(&sem->waking);
+                ret = 1;
+        } else if (signal_pending(tsk)) {
+                inc(&sem->count);
+                ret = -EINTR;
+        }
+        local_irq_restore(flags);
+        return ret;
+}
+
+extern inline int waking_non_zero_trylock(struct semaphore *sem)
+{
+        int ret = 1;
+        unsigned long flags;
+
+        local_save_flags(flags);
+        local_irq_disable();
+        if (read(&sem->waking) <= 0)
+                inc(&sem->count);
+        else {
+                dec(&sem->waking);
+                ret = 0;
+        }
+        local_irq_restore(flags);
+        return ret;
+}
+
+#endif /* _ASM_SEMAPHORE_HELPER_H */
+
+