[Mesa-dev] [PATCH 4/7] u_queue: add util_queue_fence_reset

[Nicolai Hähnle]

From: Nicolai Hähnle <nicolai.haehnle at amd.com>

---
 src/util/u_queue.c |  4 +---
 src/util/u_queue.h | 13 +++++++++++++
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/src/util/u_queue.c b/src/util/u_queue.c
index 33436e0749a..2272006042f 100644
--- a/src/util/u_queue.c
+++ b/src/util/u_queue.c
@@ -321,32 +321,30 @@ util_queue_destroy(struct util_queue *queue)
 
 void
 util_queue_add_job(struct util_queue *queue,
                    void *job,
                    struct util_queue_fence *fence,
                    util_queue_execute_func execute,
                    util_queue_execute_func cleanup)
 {
    struct util_queue_job *ptr;
 
-   assert(fence->signalled);
-
    mtx_lock(&queue->lock);
    if (queue->kill_threads) {
       mtx_unlock(&queue->lock);
       /* well no good option here, but any leaks will be
        * short-lived as things are shutting down..
        */
       return;
    }
 
-   fence->signalled = false;
+   util_queue_fence_reset(fence);
 
    assert(queue->num_queued >= 0 && queue->num_queued <= queue->max_jobs);
 
    if (queue->num_queued == queue->max_jobs) {
       if (queue->flags & UTIL_QUEUE_INIT_RESIZE_IF_FULL) {
          /* If the queue is full, make it larger to avoid waiting for a free
           * slot.
           */
          unsigned new_max_jobs = queue->max_jobs + 8;
          struct util_queue_job *jobs =
diff --git a/src/util/u_queue.h b/src/util/u_queue.h
index 5a546e53fdc..a3e12260e30 100644
--- a/src/util/u_queue.h
+++ b/src/util/u_queue.h
@@ -52,20 +52,33 @@ struct util_queue_fence {
    mtx_t mutex;
    cnd_t cond;
    int signalled;
 };
 
 void util_queue_fence_init(struct util_queue_fence *fence);
 void util_queue_fence_destroy(struct util_queue_fence *fence);
 void util_queue_fence_wait(struct util_queue_fence *fence);
 void util_queue_fence_signal(struct util_queue_fence *fence);
 
+/**
+ * Move \p fence back into unsignalled state.
+ *
+ * \warning The caller must ensure that no other thread may currently be
+ *          waiting (or about to wait) on the fence.
+ */
+static inline void
+util_queue_fence_reset(struct util_queue_fence *fence)
+{
+   assert(fence->signalled);
+   fence->signalled = 0;
+}
+
 static inline bool
 util_queue_fence_is_signalled(struct util_queue_fence *fence)
 {
    return fence->signalled != 0;
 }
 
 typedef void (*util_queue_execute_func)(void *job, int thread_index);
 
 struct util_queue_job {
    void *job;
-- 
2.11.0