tools/testing/selftests/sync/sync_stress_parallelism.c

   1 /*
   2  *  sync stress test: parallelism
   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 static struct {
  35         int iterations;
  36         int timeline;
  37         int counter;
  38 } test_data_two_threads;
  39
  40 static int test_stress_two_threads_shared_timeline_thread(void *d)
  41 {
  42         int thread_id = (long)d;
  43         int timeline = test_data_two_threads.timeline;
  44         int iterations = test_data_two_threads.iterations;
  45         int fence, valid, ret, i;
  46
  47         for (i = 0; i < iterations; i++) {
  48                 fence = sw_sync_fence_create(timeline, "fence",
  49                                              i * 2 + thread_id);
  50                 valid = sw_sync_fence_is_valid(fence);
  51                 ASSERT(valid, "Failure allocating fence\n");
  52
  53                 /* Wait on the prior thread to complete */
  54                 ret = sync_wait(fence, -1);
  55                 ASSERT(ret > 0, "Problem occurred on prior thread\n");
  56
  57                 /*
  58                  * Confirm the previous thread's writes are visible
  59                  * and then increment
  60                  */
  61                 ASSERT(test_data_two_threads.counter == i * 2 + thread_id,
  62                        "Counter got damaged!\n");
  63                 test_data_two_threads.counter++;
  64
  65                 /* Kick off the other thread */
  66                 ret = sw_sync_timeline_inc(timeline, 1);
  67                 ASSERT(ret == 0, "Advancing timeline failed\n");
  68
  69                 sw_sync_fence_destroy(fence);
  70         }
  71
  72         return 0;
  73 }
  74
  75 int test_stress_two_threads_shared_timeline(void)
  76 {
  77         pthread_t a, b;
  78         int valid;
  79         int timeline = sw_sync_timeline_create();
  80
  81         valid = sw_sync_timeline_is_valid(timeline);
  82         ASSERT(valid, "Failure allocating timeline\n");
  83
  84         test_data_two_threads.iterations = 1 << 16;
  85         test_data_two_threads.counter = 0;
  86         test_data_two_threads.timeline = timeline;
  87
  88         /*
  89          * Use a single timeline to synchronize two threads
  90          * hammmering on the same counter.
  91          */
  92
  93         pthread_create(&a, NULL, (void *(*)(void *))
  94                        test_stress_two_threads_shared_timeline_thread,
  95                        (void *)0);
  96         pthread_create(&b, NULL, (void *(*)(void *))
  97                        test_stress_two_threads_shared_timeline_thread,
  98                        (void *)1);
  99
 100         pthread_join(a, NULL);
 101         pthread_join(b, NULL);
 102
 103         /* make sure the threads did not trample on one another */
 104         ASSERT(test_data_two_threads.counter ==
 105                test_data_two_threads.iterations * 2,
 106                "Counter has unexpected value\n");
 107
 108         sw_sync_timeline_destroy(timeline);
 109
 110         return 0;
 111 }