root/tools/testing/selftests/sync/sync_stress_consumer.c

DEFINITIONS

1. busy_wait_on_fence
2. mpsc_producer_thread
3. mpcs_consumer_thread
4. test_consumer_stress_multi_producer_single_consumer

   1 /*
   2  *  sync stress test: producer/consumer
   3  *  Copyright 2015-2016 Collabora Ltd.
   4  *
   5  *  Based on the implementation from the Android Open Source Project,
   6  *
   7  *  Copyright 2012 Google, Inc
   8  *
   9  *  Permission is hereby granted, free of charge, to any person obtaining a
  10  *  copy of this software and associated documentation files (the "Software"),
  11  *  to deal in the Software without restriction, including without limitation
  12  *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  *  and/or sell copies of the Software, and to permit persons to whom the
  14  *  Software is furnished to do so, subject to the following conditions:
  15  *
  16  *  The above copyright notice and this permission notice shall be included in
  17  *  all copies or substantial portions of the Software.
  18  *
  19  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23  *  OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24  *  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25  *  OTHER DEALINGS IN THE SOFTWARE.
  26  */
  27 
  28 #include <pthread.h>
  29 
  30 #include "sync.h"
  31 #include "sw_sync.h"
  32 #include "synctest.h"
  33 
  34 /* IMPORTANT NOTE: if you see this test failing on your system, it may be
  35  * due to a shortage of file descriptors. Please ensure your system has
  36  * a sensible limit for this test to finish correctly.
  37  */
  38 
  39 /* Returns 1 on error, 0 on success */
  40 static int busy_wait_on_fence(int fence)
  41 {
  42         int error, active;
  43 
  44         do {
  45                 error = sync_fence_count_with_status(fence, FENCE_STATUS_ERROR);
  46                 ASSERT(error == 0, "Error occurred on fence\n");
  47                 active = sync_fence_count_with_status(fence,
  48                                                       FENCE_STATUS_ACTIVE);
  49         } while (active);
  50 
  51         return 0;
  52 }
  53 
  54 static struct {
  55         int iterations;
  56         int threads;
  57         int counter;
  58         int consumer_timeline;
  59         int *producer_timelines;
  60         pthread_mutex_t lock;
  61 } test_data_mpsc;
  62 
  63 static int mpsc_producer_thread(void *d)
  64 {
  65         int id = (long)d;
  66         int fence, valid, i;
  67         int *producer_timelines = test_data_mpsc.producer_timelines;
  68         int consumer_timeline = test_data_mpsc.consumer_timeline;
  69         int iterations = test_data_mpsc.iterations;
  70 
  71         for (i = 0; i < iterations; i++) {
  72                 fence = sw_sync_fence_create(consumer_timeline, "fence", i);
  73                 valid = sw_sync_fence_is_valid(fence);
  74                 ASSERT(valid, "Failure creating fence\n");
  75 
  76                 /*
  77                  * Wait for the consumer to finish. Use alternate
  78                  * means of waiting on the fence
  79                  */
  80 
  81                 if ((iterations + id) % 8 != 0) {
  82                         ASSERT(sync_wait(fence, -1) > 0,
  83                                "Failure waiting on fence\n");
  84                 } else {
  85                         ASSERT(busy_wait_on_fence(fence) == 0,
  86                                "Failure waiting on fence\n");
  87                 }
  88 
  89                 /*
  90                  * Every producer increments the counter, the consumer
  91                  * checks and erases it
  92                  */
  93                 pthread_mutex_lock(&test_data_mpsc.lock);
  94                 test_data_mpsc.counter++;
  95                 pthread_mutex_unlock(&test_data_mpsc.lock);
  96 
  97                 ASSERT(sw_sync_timeline_inc(producer_timelines[id], 1) == 0,
  98                        "Error advancing producer timeline\n");
  99 
 100                 sw_sync_fence_destroy(fence);
 101         }
 102 
 103         return 0;
 104 }
 105 
 106 static int mpcs_consumer_thread(void)
 107 {
 108         int fence, merged, tmp, valid, it, i;
 109         int *producer_timelines = test_data_mpsc.producer_timelines;
 110         int consumer_timeline = test_data_mpsc.consumer_timeline;
 111         int iterations = test_data_mpsc.iterations;
 112         int n = test_data_mpsc.threads;
 113 
 114         for (it = 1; it <= iterations; it++) {
 115                 fence = sw_sync_fence_create(producer_timelines[0], "name", it);
 116                 for (i = 1; i < n; i++) {
 117                         tmp = sw_sync_fence_create(producer_timelines[i],
 118                                                    "name", it);
 119                         merged = sync_merge("name", tmp, fence);
 120                         sw_sync_fence_destroy(tmp);
 121                         sw_sync_fence_destroy(fence);
 122                         fence = merged;
 123                 }
 124 
 125                 valid = sw_sync_fence_is_valid(fence);
 126                 ASSERT(valid, "Failure merging fences\n");
 127 
 128                 /*
 129                  * Make sure we see an increment from every producer thread.
 130                  * Vary the means by which we wait.
 131                  */
 132                 if (iterations % 8 != 0) {
 133                         ASSERT(sync_wait(fence, -1) > 0,
 134                                "Producers did not increment as expected\n");
 135                 } else {
 136                         ASSERT(busy_wait_on_fence(fence) == 0,
 137                                "Producers did not increment as expected\n");
 138                 }
 139 
 140                 ASSERT(test_data_mpsc.counter == n * it,
 141                        "Counter value mismatch!\n");
 142 
 143                 /* Release the producer threads */
 144                 ASSERT(sw_sync_timeline_inc(consumer_timeline, 1) == 0,
 145                        "Failure releasing producer threads\n");
 146 
 147                 sw_sync_fence_destroy(fence);
 148         }
 149 
 150         return 0;
 151 }
 152 
 153 int test_consumer_stress_multi_producer_single_consumer(void)
 154 {
 155         int iterations = 1 << 12;
 156         int n = 5;
 157         long i, ret;
 158         int producer_timelines[n];
 159         int consumer_timeline;
 160         pthread_t threads[n];
 161 
 162         consumer_timeline = sw_sync_timeline_create();
 163         for (i = 0; i < n; i++)
 164                 producer_timelines[i] = sw_sync_timeline_create();
 165 
 166         test_data_mpsc.producer_timelines = producer_timelines;
 167         test_data_mpsc.consumer_timeline = consumer_timeline;
 168         test_data_mpsc.iterations = iterations;
 169         test_data_mpsc.threads = n;
 170         test_data_mpsc.counter = 0;
 171         pthread_mutex_init(&test_data_mpsc.lock, NULL);
 172 
 173         for (i = 0; i < n; i++) {
 174                 pthread_create(&threads[i], NULL, (void * (*)(void *))
 175                                mpsc_producer_thread, (void *)i);
 176         }
 177 
 178         /* Consumer thread runs here */
 179         ret = mpcs_consumer_thread();
 180 
 181         for (i = 0; i < n; i++)
 182                 pthread_join(threads[i], NULL);
 183 
 184         return ret;
 185 }