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      1 /*
      2  * Copyright  2016 Intel Corporation
      3  *
      4  * Permission is hereby granted, free of charge, to any person obtaining a
      5  * copy of this software and associated documentation files (the "Software"),
      6  * to deal in the Software without restriction, including without limitation
      7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8  * and/or sell copies of the Software, and to permit persons to whom the
      9  * Software is furnished to do so, subject to the following conditions:
     10  *
     11  * The above copyright notice and this permission notice (including the next
     12  * paragraph) shall be included in all copies or substantial portions of the
     13  * Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     21  * IN THE SOFTWARE.
     22  */
     23 
     24 #ifndef VULKAN_WSI_COMMON_QUEUE_H
     25 #define VULKAN_WSI_COMMON_QUEUE_H
     26 
     27 #include <time.h>
     28 #include <pthread.h>
     29 #include "util/u_vector.h"
     30 
     31 struct wsi_queue {
     32    struct u_vector vector;
     33    pthread_mutex_t mutex;
     34    pthread_cond_t cond;
     35 };
     36 
     37 static inline int
     38 wsi_queue_init(struct wsi_queue *queue, int length)
     39 {
     40    int ret;
     41 
     42    uint32_t length_pow2 = 4;
     43    while (length_pow2 < length)
     44       length_pow2 *= 2;
     45 
     46    ret = u_vector_init(&queue->vector, sizeof(uint32_t),
     47                        sizeof(uint32_t) * length_pow2);
     48    if (!ret)
     49       return ENOMEM;
     50 
     51    pthread_condattr_t condattr;
     52    ret = pthread_condattr_init(&condattr);
     53    if (ret)
     54       goto fail_vector;
     55 
     56    ret = pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC);
     57    if (ret)
     58       goto fail_condattr;
     59 
     60    ret = pthread_cond_init(&queue->cond, &condattr);
     61    if (ret)
     62       goto fail_condattr;
     63 
     64    ret = pthread_mutex_init(&queue->mutex, NULL);
     65    if (ret)
     66       goto fail_cond;
     67 
     68    pthread_condattr_destroy(&condattr);
     69    return 0;
     70 
     71 fail_cond:
     72    pthread_cond_destroy(&queue->cond);
     73 fail_condattr:
     74    pthread_condattr_destroy(&condattr);
     75 fail_vector:
     76    u_vector_finish(&queue->vector);
     77 
     78    return ret;
     79 }
     80 
     81 static inline void
     82 wsi_queue_destroy(struct wsi_queue *queue)
     83 {
     84    u_vector_finish(&queue->vector);
     85    pthread_mutex_destroy(&queue->mutex);
     86    pthread_cond_destroy(&queue->cond);
     87 }
     88 
     89 static inline void
     90 wsi_queue_push(struct wsi_queue *queue, uint32_t index)
     91 {
     92    uint32_t *elem;
     93 
     94    pthread_mutex_lock(&queue->mutex);
     95 
     96    if (u_vector_length(&queue->vector) == 0)
     97       pthread_cond_signal(&queue->cond);
     98 
     99    elem = u_vector_add(&queue->vector);
    100    *elem = index;
    101 
    102    pthread_mutex_unlock(&queue->mutex);
    103 }
    104 
    105 #define NSEC_PER_SEC 1000000000
    106 #define INT_TYPE_MAX(type) ((1ull << (sizeof(type) * 8 - 1)) - 1)
    107 
    108 static inline VkResult
    109 wsi_queue_pull(struct wsi_queue *queue, uint32_t *index, uint64_t timeout)
    110 {
    111    VkResult result;
    112    int32_t ret;
    113 
    114    pthread_mutex_lock(&queue->mutex);
    115 
    116    struct timespec now;
    117    clock_gettime(CLOCK_MONOTONIC, &now);
    118 
    119    uint32_t abs_nsec = now.tv_nsec + timeout % NSEC_PER_SEC;
    120    uint64_t abs_sec = now.tv_sec + (abs_nsec / NSEC_PER_SEC) +
    121                       (timeout / NSEC_PER_SEC);
    122    abs_nsec %= NSEC_PER_SEC;
    123 
    124    /* Avoid roll-over in tv_sec on 32-bit systems if the user provided timeout
    125     * is UINT64_MAX
    126     */
    127    struct timespec abstime;
    128    abstime.tv_nsec = abs_nsec;
    129    abstime.tv_sec = MIN2(abs_sec, INT_TYPE_MAX(abstime.tv_sec));
    130 
    131    while (u_vector_length(&queue->vector) == 0) {
    132       ret = pthread_cond_timedwait(&queue->cond, &queue->mutex, &abstime);
    133       if (ret == 0) {
    134          continue;
    135       } else if (ret == ETIMEDOUT) {
    136          result = VK_TIMEOUT;
    137          goto end;
    138       } else {
    139          /* Something went badly wrong */
    140          result = VK_ERROR_OUT_OF_DATE_KHR;
    141          goto end;
    142       }
    143    }
    144 
    145    uint32_t *elem = u_vector_remove(&queue->vector);
    146    *index = *elem;
    147    result = VK_SUCCESS;
    148 
    149 end:
    150    pthread_mutex_unlock(&queue->mutex);
    151 
    152    return result;
    153 }
    154 
    155 #endif /* VULKAN_WSI_COMMON_QUEUE_H */
    156