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      1 /**************************************************************************
      2  *
      3  * Copyright 2009-2010 VMware, Inc.
      4  * All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the
      8  * "Software"), to deal in the Software without restriction, including
      9  * without limitation the rights to use, copy, modify, merge, publish,
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     11  * permit persons to whom the Software is furnished to do so, subject to
     12  * the following conditions:
     13  *
     14  * The above copyright notice and this permission notice (including the
     15  * next paragraph) shall be included in all copies or substantial portions
     16  * of the Software.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
     21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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     24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25  *
     26  **************************************************************************/
     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 }
    132