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/*
* 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 */
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