1 files changed, 154 insertions, 0 deletions
diff --git a/src/vulkan/wsi/wsi_common_queue.h b/src/vulkan/wsi/wsi_common_queue.h
new file mode 100644
index 00000000000..0e72c8d2cc6
--- /dev/null
+++ b/src/vulkan/wsi/wsi_common_queue.h
@@ -0,0 +1,154 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef VULKAN_WSI_COMMON_QUEUE_H
+#define VULKAN_WSI_COMMON_QUEUE_H
+
+#include <time.h>
+#include <pthread.h>
+#include "util/u_vector.h"
+
+struct wsi_queue {
+   struct u_vector vector;
+   pthread_mutex_t mutex;
+   pthread_cond_t cond;
+};
+
+static inline int
+wsi_queue_init(struct wsi_queue *queue, int length)
+{
+   int ret;
+
+   uint32_t length_pow2 = 4;
+   while (length_pow2 < length)
+      length_pow2 *= 2;
+
+   ret = u_vector_init(&queue->vector, sizeof(uint32_t),
+                       sizeof(uint32_t) * length_pow2);
+   if (!ret)
+      return ENOMEM;
+
+   pthread_condattr_t condattr;
+   ret = pthread_condattr_init(&condattr);
+   if (ret)
+      goto fail_vector;
+
+   ret = pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC);
+   if (ret)
+      goto fail_condattr;
+
+   ret = pthread_cond_init(&queue->cond, &condattr);
+   if (ret)
+      goto fail_condattr;
+
+   ret = pthread_mutex_init(&queue->mutex, NULL);
+   if (ret)
+      goto fail_cond;
+
+   return 0;
+
+fail_cond:
+   pthread_cond_destroy(&queue->cond);
+fail_condattr:
+   pthread_condattr_destroy(&condattr);
+fail_vector:
+   u_vector_finish(&queue->vector);
+
+   return ret;
+}
+
+static inline void
+wsi_queue_destroy(struct wsi_queue *queue)
+{
+   u_vector_finish(&queue->vector);
+   pthread_mutex_destroy(&queue->mutex);
+   pthread_cond_destroy(&queue->cond);
+}
+
+static inline void
+wsi_queue_push(struct wsi_queue *queue, uint32_t index)
+{
+   uint32_t *elem;
+
+   pthread_mutex_lock(&queue->mutex);
+
+   if (u_vector_length(&queue->vector) == 0)
+      pthread_cond_signal(&queue->cond);
+
+   elem = u_vector_add(&queue->vector);
+   *elem = index;
+
+   pthread_mutex_unlock(&queue->mutex);
+}
+
+#define NSEC_PER_SEC 1000000000
+#define INT_TYPE_MAX(type) ((1ull << (sizeof(type) * 8 - 1)) - 1)
+
+static inline VkResult
+wsi_queue_pull(struct wsi_queue *queue, uint32_t *index, uint64_t timeout)
+{
+   VkResult result;
+   int32_t ret;
+
+   pthread_mutex_lock(&queue->mutex);
+
+   struct timespec now;
+   clock_gettime(CLOCK_MONOTONIC, &now);
+
+   uint32_t abs_nsec = now.tv_nsec + timeout % NSEC_PER_SEC;
+   uint64_t abs_sec = now.tv_sec + (abs_nsec / NSEC_PER_SEC) +
+                      (timeout / NSEC_PER_SEC);
+   abs_nsec %= NSEC_PER_SEC;
+
+   /* Avoid roll-over in tv_sec on 32-bit systems if the user provided timeout
+    * is UINT64_MAX
+    */
+   struct timespec abstime;
+   abstime.tv_nsec = abs_nsec;
+   abstime.tv_sec = MIN2(abs_sec, INT_TYPE_MAX(abstime.tv_sec));
+
+   while (u_vector_length(&queue->vector) == 0) {
+      ret = pthread_cond_timedwait(&queue->cond, &queue->mutex, &abstime);
+      if (ret == 0) {
+         continue;
+      } else if (ret == ETIMEDOUT) {
+         result = VK_TIMEOUT;
+         goto end;
+      } else {
+         /* Something went badly wrong */
+         result = VK_ERROR_OUT_OF_DATE_KHR;
+         goto end;
+      }
+   }
+
+   uint32_t *elem = u_vector_remove(&queue->vector);
+   *index = *elem;
+   result = VK_SUCCESS;
+
+end:
+   pthread_mutex_unlock(&queue->mutex);
+
+   return result;
+}
+
+#endif /* VULKAN_WSI_COMMON_QUEUE_H */