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 }