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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,
     10  * distribute, sub license, and/or sell copies of the Software, and to
     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.
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     24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25  *
     26  **************************************************************************/
     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 }
    130