/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to

 * deal in the Software without restriction, including without limitation the

 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or

 * sell copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 */

#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;

}