| /* |
| Copyright (c) 2013 Martin Sustrik 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 "sem.h" |
| #include "err.h" |
| #include "fast.h" |
| |
| #if defined NN_HAVE_OSX |
| |
| void nn_sem_init (struct nn_sem *self) |
| { |
| int rc; |
| |
| rc = pthread_mutex_init (&self->mutex, NULL); |
| errnum_assert (rc == 0, rc); |
| rc = pthread_cond_init (&self->cond, NULL); |
| errnum_assert (rc == 0, rc); |
| self->signaled = 0; |
| } |
| |
| void nn_sem_term (struct nn_sem *self) |
| { |
| int rc; |
| |
| rc = pthread_cond_destroy (&self->cond); |
| errnum_assert (rc == 0, rc); |
| rc = pthread_mutex_destroy (&self->mutex); |
| errnum_assert (rc == 0, rc); |
| } |
| |
| void nn_sem_post (struct nn_sem *self) |
| { |
| int rc; |
| |
| rc = pthread_mutex_lock (&self->mutex); |
| errnum_assert (rc == 0, rc); |
| nn_assert (self->signaled == 0); |
| self->signaled = 1; |
| rc = pthread_cond_signal (&self->cond); |
| errnum_assert (rc == 0, rc); |
| rc = pthread_mutex_unlock (&self->mutex); |
| errnum_assert (rc == 0, rc); |
| } |
| |
| int nn_sem_wait (struct nn_sem *self) |
| { |
| int rc; |
| |
| /* With OSX, semaphores are global named objects. They are not useful for |
| our use case. To get a similar object we exploit the implementation |
| detail of pthread_cond_wait() in Darwin kernel: It exits if signal is |
| caught. Note that this behaviour is not mandated by POSIX |
| and may break with future versions of Darwin. */ |
| rc = pthread_mutex_lock (&self->mutex); |
| errnum_assert (rc == 0, rc); |
| if (nn_fast (self->signaled)) { |
| rc = pthread_mutex_unlock (&self->mutex); |
| errnum_assert (rc == 0, rc); |
| return 0; |
| } |
| rc = pthread_cond_wait (&self->cond, &self->mutex); |
| errnum_assert (rc == 0, rc); |
| if (nn_slow (!self->signaled)) { |
| rc = pthread_mutex_unlock (&self->mutex); |
| errnum_assert (rc == 0, rc); |
| return -EINTR; |
| } |
| self->signaled = 0; |
| rc = pthread_mutex_unlock (&self->mutex); |
| errnum_assert (rc == 0, rc); |
| |
| return 0; |
| } |
| |
| #elif defined NN_HAVE_WINDOWS |
| |
| void nn_sem_init (struct nn_sem *self) |
| { |
| self->h = CreateEvent (NULL, FALSE, FALSE, NULL); |
| win_assert (self->h); |
| } |
| |
| void nn_sem_term (struct nn_sem *self) |
| { |
| BOOL brc; |
| |
| brc = CloseHandle (self->h); |
| win_assert (brc); |
| } |
| |
| void nn_sem_post (struct nn_sem *self) |
| { |
| BOOL brc; |
| |
| brc = SetEvent (self->h); |
| win_assert (brc); |
| } |
| |
| int nn_sem_wait (struct nn_sem *self) |
| { |
| DWORD rc; |
| |
| rc = WaitForSingleObject (self->h, INFINITE); |
| win_assert (rc != WAIT_FAILED); |
| nn_assert (rc == WAIT_OBJECT_0); |
| |
| return 0; |
| } |
| |
| #elif defined NN_HAVE_SEMAPHORE |
| |
| void nn_sem_init (struct nn_sem *self) |
| { |
| int rc; |
| |
| rc = sem_init (&self->sem, 0, 0); |
| errno_assert (rc == 0); |
| } |
| |
| void nn_sem_term (struct nn_sem *self) |
| { |
| int rc; |
| |
| rc = sem_destroy (&self->sem); |
| errno_assert (rc == 0); |
| } |
| |
| void nn_sem_post (struct nn_sem *self) |
| { |
| int rc; |
| |
| rc = sem_post (&self->sem); |
| errno_assert (rc == 0); |
| } |
| |
| int nn_sem_wait (struct nn_sem *self) |
| { |
| int rc; |
| |
| rc = sem_wait (&self->sem); |
| if (nn_slow (rc < 0 && errno == EINTR)) |
| return -EINTR; |
| errno_assert (rc == 0); |
| return 0; |
| } |
| |
| #else |
| #error |
| #endif |
| |