#include "u_queue.h"
+#include <time.h>
+
+#include "util/os_time.h"
#include "util/u_string.h"
#include "util/u_thread.h"
* util_queue_fence
*/
+#ifdef UTIL_QUEUE_FENCE_FUTEX
+static bool
+do_futex_fence_wait(struct util_queue_fence *fence,
+ bool timeout, int64_t abs_timeout)
+{
+ uint32_t v = fence->val;
+ struct timespec ts;
+ ts.tv_sec = abs_timeout / (1000*1000*1000);
+ ts.tv_nsec = abs_timeout % (1000*1000*1000);
+
+ while (v != 0) {
+ if (v != 2) {
+ v = p_atomic_cmpxchg(&fence->val, 1, 2);
+ if (v == 0)
+ return true;
+ }
+
+ int r = futex_wait(&fence->val, 2, timeout ? &ts : NULL);
+ if (timeout && r < 0) {
+ if (errno == -ETIMEDOUT)
+ return false;
+ }
+
+ v = fence->val;
+ }
+
+ return true;
+}
+
+void
+_util_queue_fence_wait(struct util_queue_fence *fence)
+{
+ do_futex_fence_wait(fence, false, 0);
+}
+
+bool
+_util_queue_fence_wait_timeout(struct util_queue_fence *fence,
+ int64_t abs_timeout)
+{
+ return do_futex_fence_wait(fence, true, abs_timeout);
+}
+
+#endif
+
#ifdef UTIL_QUEUE_FENCE_STANDARD
void
util_queue_fence_signal(struct util_queue_fence *fence)
}
void
-util_queue_fence_wait(struct util_queue_fence *fence)
+_util_queue_fence_wait(struct util_queue_fence *fence)
{
mtx_lock(&fence->mutex);
while (!fence->signalled)
mtx_unlock(&fence->mutex);
}
+bool
+_util_queue_fence_wait_timeout(struct util_queue_fence *fence,
+ int64_t abs_timeout)
+{
+ /* This terrible hack is made necessary by the fact that we really want an
+ * internal interface consistent with os_time_*, but cnd_timedwait is spec'd
+ * to be relative to the TIME_UTC clock.
+ */
+ int64_t rel = abs_timeout - os_time_get_nano();
+
+ if (rel > 0) {
+ struct timespec ts;
+
+ timespec_get(&ts, TIME_UTC);
+
+ ts.tv_sec += abs_timeout / (1000*1000*1000);
+ ts.tv_nsec += abs_timeout % (1000*1000*1000);
+ if (ts.tv_nsec >= (1000*1000*1000)) {
+ ts.tv_sec++;
+ ts.tv_nsec -= (1000*1000*1000);
+ }
+
+ mtx_lock(&fence->mutex);
+ while (!fence->signalled) {
+ if (cnd_timedwait(&fence->cond, &fence->mutex, &ts) != thrd_success)
+ break;
+ }
+ mtx_unlock(&fence->mutex);
+ }
+
+ return fence->signalled;
+}
+
void
util_queue_fence_init(struct util_queue_fence *fence)
{