/* Copyright libuv project 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 "uv-common.h"

#include <stdlib.h>

#ifndef _WIN32

#include <pthread.h>

#endif

#if defined(PTHREAD_BARRIER_SERIAL_THREAD)

STATIC_ASSERT(sizeof(uv_barrier_t) == sizeof(pthread_barrier_t));

#endif

/* Note: guard clauses should match uv_barrier_t's in include/uv/unix.h. */

#if defined(_AIX) || \

defined(__OpenBSD__) || \

!defined(PTHREAD_BARRIER_SERIAL_THREAD)

int uv_barrier_init(uv_barrier_t* barrier, unsigned int count) {

int rc;

#ifdef _WIN32

uv_barrier_t* b;

b = barrier;

if (barrier == NULL || count == 0)

return UV_EINVAL;

#else

struct _uv_barrier* b;

if (barrier == NULL || count == 0)

return UV_EINVAL;

b = uv__malloc(sizeof(*b));

if (b == NULL)

return UV_ENOMEM;

#endif

b->in = 0;

b->out = 0;

b->threshold = count;

rc = uv_mutex_init(&b->mutex);

if (rc != 0)

goto error2;

/* TODO(vjnash): remove these uv_cond_t casts in v2. */

rc = uv_cond_init((uv_cond_t*) &b->cond);

if (rc != 0)

goto error;

#ifndef _WIN32

barrier->b = b;

#endif

return 0;

error:

uv_mutex_destroy(&b->mutex);

error2:

#ifndef _WIN32

uv__free(b);

#endif

return rc;

}

int uv_barrier_wait(uv_barrier_t* barrier) {

int last;

#ifdef _WIN32

uv_barrier_t* b;

b = barrier;

#else

struct _uv_barrier* b;

if (barrier == NULL || barrier->b == NULL)

return UV_EINVAL;

b = barrier->b;

#endif

uv_mutex_lock(&b->mutex);

while (b->out != 0)

uv_cond_wait((uv_cond_t*) &b->cond, &b->mutex);

if (++b->in == b->threshold) {

b->in = 0;

b->out = b->threshold;

uv_cond_broadcast((uv_cond_t*) &b->cond);

} else {

do

uv_cond_wait((uv_cond_t*) &b->cond, &b->mutex);

while (b->in != 0);

}

last = (--b->out == 0);

if (last)

uv_cond_broadcast((uv_cond_t*) &b->cond);

uv_mutex_unlock(&b->mutex);

return last;

}

void uv_barrier_destroy(uv_barrier_t* barrier) {

#ifdef _WIN32

uv_barrier_t* b;

b = barrier;

#else

struct _uv_barrier* b;

b = barrier->b;

#endif

uv_mutex_lock(&b->mutex);

assert(b->in == 0);

while (b->out != 0)

uv_cond_wait((uv_cond_t*) &b->cond, &b->mutex);

if (b->in != 0)

abort();

uv_mutex_unlock(&b->mutex);

uv_mutex_destroy(&b->mutex);

uv_cond_destroy((uv_cond_t*) &b->cond);

#ifndef _WIN32

uv__free(barrier->b);

barrier->b = NULL;

#endif

}

#else

int uv_barrier_init(uv_barrier_t* barrier, unsigned int count) {

return UV__ERR(pthread_barrier_init(barrier, NULL, count));

}

int uv_barrier_wait(uv_barrier_t* barrier) {

int rc;

rc = pthread_barrier_wait(barrier);

if (rc != 0)

if (rc != PTHREAD_BARRIER_SERIAL_THREAD)

abort();

return rc == PTHREAD_BARRIER_SERIAL_THREAD;

}

void uv_barrier_destroy(uv_barrier_t* barrier) {

if (pthread_barrier_destroy(barrier))

abort();

}

#endif