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test-barrier.c revision 1.1 
      1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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      4  * of this software and associated documentation files (the "Software"), to
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      7  * sell copies of the Software, and to permit persons to whom the Software is
      8  * furnished to do so, subject to the following conditions:
      9  *
     10  * The above copyright notice and this permission notice shall be included in
     11  * all copies or substantial portions of the Software.
     12  *
     13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     16  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     17  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     18  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     19  * IN THE SOFTWARE.
     20  */
     21 
     22 #include "uv.h"
     23 #include "task.h"
     24 
     25 #include <string.h>
     26 #include <errno.h>
     27 
     28 typedef struct {
     29   uv_barrier_t barrier;
     30   int delay;
     31   volatile int posted;
     32   int main_barrier_wait_rval;
     33   int worker_barrier_wait_rval;
     34 } worker_config;
     35 
     36 
     37 static void worker(void* arg) {
     38   worker_config* c = arg;
     39 
     40   if (c->delay)
     41     uv_sleep(c->delay);
     42 
     43   c->worker_barrier_wait_rval = uv_barrier_wait(&c->barrier);
     44 }
     45 
     46 
     47 TEST_IMPL(barrier_1) {
     48   uv_thread_t thread;
     49   worker_config wc;
     50 
     51   memset(&wc, 0, sizeof(wc));
     52 
     53   ASSERT(0 == uv_barrier_init(&wc.barrier, 2));
     54   ASSERT(0 == uv_thread_create(&thread, worker, &wc));
     55 
     56   uv_sleep(100);
     57   wc.main_barrier_wait_rval = uv_barrier_wait(&wc.barrier);
     58 
     59   ASSERT(0 == uv_thread_join(&thread));
     60   uv_barrier_destroy(&wc.barrier);
     61 
     62   ASSERT(1 == (wc.main_barrier_wait_rval ^ wc.worker_barrier_wait_rval));
     63 
     64   return 0;
     65 }
     66 
     67 
     68 TEST_IMPL(barrier_2) {
     69   uv_thread_t thread;
     70   worker_config wc;
     71 
     72   memset(&wc, 0, sizeof(wc));
     73   wc.delay = 100;
     74 
     75   ASSERT(0 == uv_barrier_init(&wc.barrier, 2));
     76   ASSERT(0 == uv_thread_create(&thread, worker, &wc));
     77 
     78   wc.main_barrier_wait_rval = uv_barrier_wait(&wc.barrier);
     79 
     80   ASSERT(0 == uv_thread_join(&thread));
     81   uv_barrier_destroy(&wc.barrier);
     82 
     83   ASSERT(1 == (wc.main_barrier_wait_rval ^ wc.worker_barrier_wait_rval));
     84 
     85   return 0;
     86 }
     87 
     88 
     89 TEST_IMPL(barrier_3) {
     90   uv_thread_t thread;
     91   worker_config wc;
     92 
     93   memset(&wc, 0, sizeof(wc));
     94 
     95   ASSERT(0 == uv_barrier_init(&wc.barrier, 2));
     96   ASSERT(0 == uv_thread_create(&thread, worker, &wc));
     97 
     98   wc.main_barrier_wait_rval = uv_barrier_wait(&wc.barrier);
     99 
    100   ASSERT(0 == uv_thread_join(&thread));
    101   uv_barrier_destroy(&wc.barrier);
    102 
    103   ASSERT(1 == (wc.main_barrier_wait_rval ^ wc.worker_barrier_wait_rval));
    104 
    105   return 0;
    106 }
    107 
    108 static void serial_worker(void* data) {
    109   uv_barrier_t* barrier;
    110 
    111   barrier = data;
    112   if (uv_barrier_wait(barrier) > 0)
    113     uv_barrier_destroy(barrier);
    114 
    115   uv_sleep(100);  /* Wait a bit before terminating. */
    116 }
    117 
    118 /* Ensure that uv_barrier_wait returns positive only after all threads have
    119  * exited the barrier. If this value is returned too early and the barrier is
    120  * destroyed prematurely, then this test may see a crash. */
    121 TEST_IMPL(barrier_serial_thread) {
    122   uv_thread_t threads[4];
    123   uv_barrier_t barrier;
    124   unsigned i;
    125 
    126   ASSERT(0 == uv_barrier_init(&barrier, ARRAY_SIZE(threads) + 1));
    127 
    128   for (i = 0; i < ARRAY_SIZE(threads); ++i)
    129     ASSERT(0 == uv_thread_create(&threads[i], serial_worker, &barrier));
    130 
    131   if (uv_barrier_wait(&barrier) > 0)
    132     uv_barrier_destroy(&barrier);
    133 
    134   for (i = 0; i < ARRAY_SIZE(threads); ++i)
    135     ASSERT(0 == uv_thread_join(&threads[i]));
    136 
    137   return 0;
    138 }
    139 
    140 /* Single thread uv_barrier_wait should return correct return value. */
    141 TEST_IMPL(barrier_serial_thread_single) {
    142   uv_barrier_t barrier;
    143 
    144   ASSERT(0 == uv_barrier_init(&barrier, 1));
    145   ASSERT(0 < uv_barrier_wait(&barrier));
    146   uv_barrier_destroy(&barrier);
    147   return 0;
    148 }
    149