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Diffstat (limited to 'plugins/eg-sampler.lv2/zix/sem.h')
| -rw-r--r-- | plugins/eg-sampler.lv2/zix/sem.h | 236 |
1 files changed, 0 insertions, 236 deletions
diff --git a/plugins/eg-sampler.lv2/zix/sem.h b/plugins/eg-sampler.lv2/zix/sem.h deleted file mode 100644 index d536c99..0000000 --- a/plugins/eg-sampler.lv2/zix/sem.h +++ /dev/null @@ -1,236 +0,0 @@ -/* - Copyright 2012-2012 David Robillard <http://drobilla.net> - - Permission to use, copy, modify, and/or distribute this software for any - purpose with or without fee is hereby granted, provided that the above - copyright notice and this permission notice appear in all copies. - - THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR - ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF - OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. -*/ - -#ifndef ZIX_SEM_H -#define ZIX_SEM_H - -#ifdef __APPLE__ -# include <mach/mach.h> -#elif defined(_WIN32) -# include <windows.h> -#else -# include <semaphore.h> -# include <errno.h> -#endif - -#include "zix/common.h" - -#ifdef __cplusplus -extern "C" { -#endif - -/** - @addtogroup zix - @{ - @name Semaphore - @{ -*/ - -/** - A counting semaphore. - - This is an integer that is always positive, and has two main operations: - increment (post) and decrement (wait). If a decrement can not be performed - (i.e. the value is 0) the caller will be blocked until another thread posts - and the operation can succeed. - - Semaphores can be created with any starting value, but typically this will - be 0 so the semaphore can be used as a simple signal where each post - corresponds to one wait. - - Semaphores are very efficient (much moreso than a mutex/cond pair). In - particular, at least on Linux, post is async-signal-safe, which means it - does not block and will not be interrupted. If you need to signal from - a realtime thread, this is the most appropriate primitive to use. -*/ -typedef struct ZixSemImpl ZixSem; - -/** - Create and initialize @c sem to @c initial. -*/ -static inline ZixStatus -zix_sem_init(ZixSem* sem, unsigned initial); - -/** - Destroy @c sem. -*/ -static inline void -zix_sem_destroy(ZixSem* sem); - -/** - Increment (and signal any waiters). - Realtime safe. -*/ -static inline void -zix_sem_post(ZixSem* sem); - -/** - Wait until count is > 0, then decrement. - Obviously not realtime safe. -*/ -static inline ZixStatus -zix_sem_wait(ZixSem* sem); - -/** - Non-blocking version of wait(). - - @return true if decrement was successful (lock was acquired). -*/ -static inline bool -zix_sem_try_wait(ZixSem* sem); - -/** - @cond -*/ - -#ifdef __APPLE__ - -struct ZixSemImpl { - semaphore_t sem; -}; - -static inline ZixStatus -zix_sem_init(ZixSem* sem, unsigned initial) -{ - return semaphore_create(mach_task_self(), &sem->sem, SYNC_POLICY_FIFO, 0) - ? ZIX_STATUS_ERROR : ZIX_STATUS_SUCCESS; -} - -static inline void -zix_sem_destroy(ZixSem* sem) -{ - semaphore_destroy(mach_task_self(), sem->sem); -} - -static inline void -zix_sem_post(ZixSem* sem) -{ - semaphore_signal(sem->sem); -} - -static inline ZixStatus -zix_sem_wait(ZixSem* sem) -{ - if (semaphore_wait(sem->sem) != KERN_SUCCESS) { - return ZIX_STATUS_ERROR; - } - return ZIX_STATUS_SUCCESS; -} - -static inline bool -zix_sem_try_wait(ZixSem* sem) -{ - const mach_timespec_t zero = { 0, 0 }; - return semaphore_timedwait(sem->sem, zero) == KERN_SUCCESS; -} - -#elif defined(_WIN32) - -struct ZixSemImpl { - HANDLE sem; -}; - -static inline ZixStatus -zix_sem_init(ZixSem* sem, unsigned initial) -{ - sem->sem = CreateSemaphore(NULL, initial, LONG_MAX, NULL); - return (sem->sem) ? ZIX_STATUS_ERROR : ZIX_STATUS_SUCCESS; -} - -static inline void -zix_sem_destroy(ZixSem* sem) -{ - CloseHandle(sem->sem); -} - -static inline void -zix_sem_post(ZixSem* sem) -{ - ReleaseSemaphore(sem->sem, 1, NULL); -} - -static inline ZixStatus -zix_sem_wait(ZixSem* sem) -{ - if (WaitForSingleObject(sem->sem, INFINITE) != WAIT_OBJECT_0) { - return ZIX_STATUS_ERROR; - } - return ZIX_STATUS_SUCCESS; -} - -static inline bool -zix_sem_try_wait(ZixSem* sem) -{ - WaitForSingleObject(sem->sem, 0); -} - -#else /* !defined(__APPLE__) && !defined(_WIN32) */ - -struct ZixSemImpl { - sem_t sem; -}; - -static inline ZixStatus -zix_sem_init(ZixSem* sem, unsigned initial) -{ - return sem_init(&sem->sem, 0, initial) - ? ZIX_STATUS_ERROR : ZIX_STATUS_SUCCESS; -} - -static inline void -zix_sem_destroy(ZixSem* sem) -{ - sem_destroy(&sem->sem); -} - -static inline void -zix_sem_post(ZixSem* sem) -{ - sem_post(&sem->sem); -} - -static inline ZixStatus -zix_sem_wait(ZixSem* sem) -{ - while (sem_wait(&sem->sem)) { - if (errno != EINTR) { - return ZIX_STATUS_ERROR; - } - /* Otherwise, interrupted, so try again. */ - } - - return ZIX_STATUS_SUCCESS; -} - -static inline bool -zix_sem_try_wait(ZixSem* sem) -{ - return (sem_trywait(&sem->sem) == 0); -} - -#endif - -/** - @endcond - @} - @} -*/ - -#ifdef __cplusplus -} /* extern "C" */ -#endif - -#endif /* ZIX_SEM_H */ |