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27
28
29 /*
30 * Test case for util_barrier.
31 *
32 * The test succeeds if no thread exits before all the other threads reach
33 * the barrier.
34 */
35
36
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40
41 #include "util/os_time.h"
42 #include "util/u_atomic.h"
43 #include "util/u_thread.h"
44
45
46 #define NUM_THREADS 10
47
48 static int verbosity = 0;
49
50 static thrd_t threads[NUM_THREADS];
51 static util_barrier barrier;
52 static int thread_ids[NUM_THREADS];
53
54 static volatile int waiting = 0;
55 static volatile int proceeded = 0;
56
57
58 #define LOG(fmt, ...) \
59 if (verbosity > 0) { \
60 fprintf(stdout, fmt, ##__VA_ARGS__); \
61 }
62
63 #define CHECK(_cond) \
64 if (!(_cond)) { \
65 fprintf(stderr, "%s:%u: `%s` failed\n", __FILE__, __LINE__, #_cond); \
66 _exit(EXIT_FAILURE); \
67 }
68
69
70 static int
thread_function(void * thread_data)71 thread_function(void *thread_data)
72 {
73 int thread_id = *((int *) thread_data);
74
75 LOG("thread %d starting\n", thread_id);
76 os_time_sleep(thread_id * 100 * 1000);
77 LOG("thread %d before barrier\n", thread_id);
78
79 CHECK(p_atomic_read(&proceeded) == 0);
80 p_atomic_inc(&waiting);
81
82 util_barrier_wait(&barrier);
83
84 CHECK(p_atomic_read(&waiting) == NUM_THREADS);
85
86 p_atomic_inc(&proceeded);
87
88 LOG("thread %d exiting\n", thread_id);
89
90 return 0;
91 }
92
93
main(int argc,char * argv[])94 int main(int argc, char *argv[])
95 {
96 int i;
97
98 for (i = 1; i < argc; ++i) {
99 const char *arg = argv[i];
100 if (strcmp(arg, "-v") == 0) {
101 ++verbosity;
102 } else {
103 fprintf(stderr, "error: unrecognized option `%s`\n", arg);
104 exit(EXIT_FAILURE);
105 }
106 }
107
108 // Disable buffering
109 setbuf(stdout, NULL);
110
111 LOG("pipe_barrier_test starting\n");
112
113 util_barrier_init(&barrier, NUM_THREADS);
114
115 for (i = 0; i < NUM_THREADS; i++) {
116 thread_ids[i] = i;
117 threads[i] = u_thread_create(thread_function, (void *) &thread_ids[i]);
118 }
119
120 for (i = 0; i < NUM_THREADS; i++ ) {
121 thrd_join(threads[i], NULL);
122 }
123
124 CHECK(p_atomic_read(&proceeded) == NUM_THREADS);
125
126 util_barrier_destroy(&barrier);
127
128 LOG("pipe_barrier_test exiting\n");
129
130 return 0;
131 }
132