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/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef VPX_VP8_COMMON_THREADING_H_
#define VPX_VP8_COMMON_THREADING_H_
#include "./vpx_config.h"
#ifdef __cplusplus
extern "C" {
#endif
#if CONFIG_OS_SUPPORT && CONFIG_MULTITHREAD
#if defined(_WIN32) && !HAVE_PTHREAD_H
/* Win32 */
#include <windows.h>
#else
/* pthreads */
#ifdef __APPLE__
#include <mach/mach_init.h>
#include <mach/semaphore.h>
#include <mach/task.h>
#include <time.h>
#include <unistd.h>
#else
#include <semaphore.h>
#endif
#endif
/* Synchronization macros: Win32 and Pthreads */
#if defined(_WIN32) && !HAVE_PTHREAD_H
#define vp8_sem_t HANDLE
#define vp8_sem_init(sem, pshared, value) \
(int)((*sem = CreateSemaphore(NULL, value, 32768, NULL)) == NULL)
#define vp8_sem_wait(sem) \
(int)(WAIT_OBJECT_0 != WaitForSingleObject(*sem, INFINITE))
#define vp8_sem_post(sem) ReleaseSemaphore(*sem, 1, NULL)
#define vp8_sem_destroy(sem) \
if (*sem) ((int)(CloseHandle(*sem)) == TRUE)
#define thread_sleep(nms) Sleep(nms)
#else
#ifdef __APPLE__
#define vp8_sem_t semaphore_t
#define vp8_sem_init(sem, pshared, value) \
semaphore_create(mach_task_self(), sem, SYNC_POLICY_FIFO, value)
#define vp8_sem_wait(sem) semaphore_wait(*sem)
#define vp8_sem_post(sem) semaphore_signal(*sem)
#define vp8_sem_destroy(sem) semaphore_destroy(mach_task_self(), *sem)
#else
#include <errno.h>
#include <unistd.h>
#include <sched.h>
#define vp8_sem_t sem_t
#define vp8_sem_init sem_init
static INLINE int vp8_sem_wait(vp8_sem_t *sem) {
int ret;
while ((ret = sem_wait(sem)) == -1 && errno == EINTR) {
}
return ret;
}
#define vp8_sem_post sem_post
#define vp8_sem_destroy sem_destroy
#endif /* __APPLE__ */
/* Not Windows. Assume pthreads */
/* thread_sleep implementation: yield unless Linux/Unix. */
#if defined(__unix__) || defined(__APPLE__)
#define thread_sleep(nms)
/* {struct timespec ts;ts.tv_sec=0;
ts.tv_nsec = 1000*nms;nanosleep(&ts, NULL);} */
#else
#define thread_sleep(nms) sched_yield();
#endif /* __unix__ || __APPLE__ */
#endif
#if VPX_ARCH_X86 || VPX_ARCH_X86_64
#include "vpx_ports/x86.h"
#else
#define x86_pause_hint()
#endif
#include "vpx_util/vpx_atomics.h"
static INLINE void vp8_atomic_spin_wait(
int mb_col, const vpx_atomic_int *last_row_current_mb_col,
const int nsync) {
while (mb_col > (vpx_atomic_load_acquire(last_row_current_mb_col) - nsync)) {
x86_pause_hint();
thread_sleep(0);
}
}
#endif /* CONFIG_OS_SUPPORT && CONFIG_MULTITHREAD */
#ifdef __cplusplus
} // extern "C"
#endif
#endif // VPX_VP8_COMMON_THREADING_H_
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