test-barrier.c

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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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#include "uv.h"
#include "task.h"
 
#include <string.h>
#include <errno.h>
 
typedef struct {
  uv_barrier_t barrier;
  int delay;
  volatile int posted;
  int main_barrier_wait_rval;
  int worker_barrier_wait_rval;
} worker_config;
 
 
static void worker(void* arg) {
  worker_config* c = arg;
 
  if (c->delay)
    uv_sleep(c->delay);
 
  c->worker_barrier_wait_rval = uv_barrier_wait(&c->barrier);
}
 
 
TEST_IMPL(barrier_1) {
  uv_thread_t thread;
  worker_config wc;
 
  memset(&wc, 0, sizeof(wc));
 
  ASSERT(0 == uv_barrier_init(&wc.barrier, 2));
  ASSERT(0 == uv_thread_create(&thread, worker, &wc));
 
  uv_sleep(100);
  wc.main_barrier_wait_rval = uv_barrier_wait(&wc.barrier);
 
  ASSERT(0 == uv_thread_join(&thread));
  uv_barrier_destroy(&wc.barrier);
 
  ASSERT(1 == (wc.main_barrier_wait_rval ^ wc.worker_barrier_wait_rval));
 
  return 0;
}
 
 
TEST_IMPL(barrier_2) {
  uv_thread_t thread;
  worker_config wc;
 
  memset(&wc, 0, sizeof(wc));
  wc.delay = 100;
 
  ASSERT(0 == uv_barrier_init(&wc.barrier, 2));
  ASSERT(0 == uv_thread_create(&thread, worker, &wc));
 
  wc.main_barrier_wait_rval = uv_barrier_wait(&wc.barrier);
 
  ASSERT(0 == uv_thread_join(&thread));
  uv_barrier_destroy(&wc.barrier);
 
  ASSERT(1 == (wc.main_barrier_wait_rval ^ wc.worker_barrier_wait_rval));
 
  return 0;
}
 
 
TEST_IMPL(barrier_3) {
  uv_thread_t thread;
  worker_config wc;
 
  memset(&wc, 0, sizeof(wc));
 
  ASSERT(0 == uv_barrier_init(&wc.barrier, 2));
  ASSERT(0 == uv_thread_create(&thread, worker, &wc));
 
  wc.main_barrier_wait_rval = uv_barrier_wait(&wc.barrier);
 
  ASSERT(0 == uv_thread_join(&thread));
  uv_barrier_destroy(&wc.barrier);
 
  ASSERT(1 == (wc.main_barrier_wait_rval ^ wc.worker_barrier_wait_rval));
 
  return 0;
}
 
static void serial_worker(void* data) {
  uv_barrier_t* barrier;
 
  barrier = data;
  if (uv_barrier_wait(barrier) > 0)
    uv_barrier_destroy(barrier);
 
  uv_sleep(100);  /* Wait a bit before terminating. */
}
 
/* Ensure that uv_barrier_wait returns positive only after all threads have
 * exited the barrier. If this value is returned too early and the barrier is
 * destroyed prematurely, then this test may see a crash. */
TEST_IMPL(barrier_serial_thread) {
  uv_thread_t threads[4];
  uv_barrier_t barrier;
  unsigned i;
 
  ASSERT(0 == uv_barrier_init(&barrier, ARRAY_SIZE(threads) + 1));
 
  for (i = 0; i < ARRAY_SIZE(threads); ++i)
    ASSERT(0 == uv_thread_create(&threads[i], serial_worker, &barrier));
 
  if (uv_barrier_wait(&barrier) > 0)
    uv_barrier_destroy(&barrier);
 
  for (i = 0; i < ARRAY_SIZE(threads); ++i)
    ASSERT(0 == uv_thread_join(&threads[i]));
 
  return 0;
}
 
/* Single thread uv_barrier_wait should return correct return value. */
TEST_IMPL(barrier_serial_thread_single) {
  uv_barrier_t barrier;
 
  ASSERT(0 == uv_barrier_init(&barrier, 1));
  ASSERT(0 < uv_barrier_wait(&barrier));
  uv_barrier_destroy(&barrier);
  return 0;
}