src/gallium/tests/unit/pipe_barrier_test.c

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  27
  28
  29 /*
  30  *  Test case for pipe_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
  40 #include "os/os_thread.h"
  41 #include "os/os_time.h"
  42 #include "util/u_atomic.h"
  43
  44
  45 #define NUM_THREADS 10
  46
  47 static int verbosity = 0;
  48
  49 static pipe_thread threads[NUM_THREADS];
  50 static pipe_barrier barrier;
  51 static int thread_ids[NUM_THREADS];
  52
  53 static volatile int waiting = 0;
  54 static volatile int proceeded = 0;
  55
  56
  57 #define LOG(fmt, ...) \
  58    if (verbosity > 0) { \
  59       fprintf(stdout, fmt, ##__VA_ARGS__); \
  60    }
  61
  62 #define CHECK(_cond) \
  63    if (!(_cond)) { \
  64       fprintf(stderr, "%s:%u: `%s` failed\n", __FILE__, __LINE__, #_cond); \
  65       _exit(EXIT_FAILURE); \
  66    }
  67
  68
  69 static PIPE_THREAD_ROUTINE(thread_function, thread_data)
  70 {
  71    int thread_id = *((int *) thread_data);
  72
  73    LOG("thread %d starting\n", thread_id);
  74    os_time_sleep(thread_id * 100 * 1000);
  75    LOG("thread %d before barrier\n", thread_id);
  76
  77    CHECK(p_atomic_read(&proceeded) == 0);
  78    p_atomic_inc(&waiting);
  79
  80    pipe_barrier_wait(&barrier);
  81
  82    CHECK(p_atomic_read(&waiting) == NUM_THREADS);
  83
  84    p_atomic_inc(&proceeded);
  85
  86    LOG("thread %d exiting\n", thread_id);
  87
  88    return 0;
  89 }
  90
  91
  92 int main(int argc, char *argv[])
  93 {
  94    int i;
  95
  96    for (i = 1; i < argc; ++i) {
  97       const char *arg = argv[i];
  98       if (strcmp(arg, "-v") == 0) {
  99          ++verbosity;
 100       } else {
 101          fprintf(stderr, "error: unrecognized option `%s`\n", arg);
 102          exit(EXIT_FAILURE);
 103       }
 104    }
 105
 106    // Disable buffering
 107    setbuf(stdout, NULL);
 108
 109    LOG("pipe_barrier_test starting\n");
 110
 111    pipe_barrier_init(&barrier, NUM_THREADS);
 112
 113    for (i = 0; i < NUM_THREADS; i++) {
 114       thread_ids[i] = i;
 115       threads[i] = pipe_thread_create(thread_function, (void *) &thread_ids[i]);
 116    }
 117
 118    for (i = 0; i < NUM_THREADS; i++ ) {
 119       pipe_thread_wait(threads[i]);
 120    }
 121
 122    CHECK(p_atomic_read(&proceeded) == NUM_THREADS);
 123
 124    pipe_barrier_destroy(&barrier);
 125
 126    LOG("pipe_barrier_test exiting\n");
 127
 128    return 0;
 129 }