src/gallium/tests/unit/pipe_barrier_test.c

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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
  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
  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 }