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-rw-r--r--src/gallium/include/pipe/p_thread.h50
1 files changed, 50 insertions, 0 deletions
diff --git a/src/gallium/include/pipe/p_thread.h b/src/gallium/include/pipe/p_thread.h
index 25e41482325..45c35a87d0e 100644
--- a/src/gallium/include/pipe/p_thread.h
+++ b/src/gallium/include/pipe/p_thread.h
@@ -207,6 +207,56 @@ typedef unsigned pipe_condvar;
#endif /* PIPE_OS_? */
+/*
+ * Semaphores
+ */
+
+typedef struct
+{
+ pipe_mutex mutex;
+ pipe_condvar cond;
+ int counter;
+} pipe_semaphore;
+
+
+static INLINE void
+pipe_semaphore_init(pipe_semaphore *sema, int init_val)
+{
+ pipe_mutex_init(sema->mutex);
+ pipe_condvar_init(sema->cond);
+ sema->counter = init_val;
+}
+
+static INLINE void
+pipe_semaphore_destroy(pipe_semaphore *sema)
+{
+ pipe_mutex_destroy(sema->mutex);
+ pipe_condvar_destroy(sema->cond);
+}
+
+/** Signal/increment semaphore counter */
+static INLINE void
+pipe_semaphore_signal(pipe_semaphore *sema)
+{
+ pipe_mutex_lock(sema->mutex);
+ sema->counter++;
+ pipe_condvar_signal(sema->cond);
+ pipe_mutex_unlock(sema->mutex);
+}
+
+/** Wait for semaphore counter to be greater than zero */
+static INLINE void
+pipe_semaphore_wait(pipe_semaphore *sema)
+{
+ pipe_mutex_lock(sema->mutex);
+ while (sema->counter <= 0) {
+ pipe_condvar_wait(sema->cond, sema->mutex);
+ }
+ sema->counter--;
+ pipe_mutex_unlock(sema->mutex);
+}
+
+
/*
* Thread-specific data.