ref: 975a3f88c42cf39193fbaf980693983be9d551d5
dir: /codec/common/src/WelsThreadLib.cpp/
/*!
* \copy
* Copyright (c) 2009-2013, Cisco Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*
* \file WelsThreadLib.c
*
* \brief Interfaces introduced in thread programming
*
* \date 11/17/2009 Created
*
*************************************************************************************
*/
#ifdef __linux__
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <sched.h>
#elif !defined(_WIN32) && !defined(__CYGWIN__)
#include <sys/types.h>
#include <sys/param.h>
#include <unistd.h>
#ifndef __Fuchsia__
#include <sys/sysctl.h>
#endif
#ifdef __APPLE__
#define HW_NCPU_NAME "hw.logicalcpu"
#else
#define HW_NCPU_NAME "hw.ncpu"
#endif
#endif
#ifdef ANDROID_NDK
#include <cpu-features.h>
#endif
#ifdef __ANDROID__
#include <android/api-level.h>
#endif
#include "WelsThreadLib.h"
#include <stdio.h>
#include <stdlib.h>
#if defined(_WIN32) || defined(__CYGWIN__)
WELS_THREAD_ERROR_CODE WelsMutexInit (WELS_MUTEX* mutex) {
InitializeCriticalSection (mutex);
return WELS_THREAD_ERROR_OK;
}
WELS_THREAD_ERROR_CODE WelsMutexLock (WELS_MUTEX* mutex) {
EnterCriticalSection (mutex);
return WELS_THREAD_ERROR_OK;
}
WELS_THREAD_ERROR_CODE WelsMutexUnlock (WELS_MUTEX* mutex) {
LeaveCriticalSection (mutex);
return WELS_THREAD_ERROR_OK;
}
WELS_THREAD_ERROR_CODE WelsMutexDestroy (WELS_MUTEX* mutex) {
DeleteCriticalSection (mutex);
return WELS_THREAD_ERROR_OK;
}
#else /* _WIN32 */
WELS_THREAD_ERROR_CODE WelsMutexInit (WELS_MUTEX* mutex) {
return pthread_mutex_init (mutex, NULL);
}
WELS_THREAD_ERROR_CODE WelsMutexLock (WELS_MUTEX* mutex) {
return pthread_mutex_lock (mutex);
}
WELS_THREAD_ERROR_CODE WelsMutexUnlock (WELS_MUTEX* mutex) {
return pthread_mutex_unlock (mutex);
}
WELS_THREAD_ERROR_CODE WelsMutexDestroy (WELS_MUTEX* mutex) {
return pthread_mutex_destroy (mutex);
}
#endif /* !_WIN32 */
#if defined(_WIN32) || defined(__CYGWIN__)
WELS_THREAD_ERROR_CODE WelsEventOpen (WELS_EVENT* event, const char* event_name) {
WELS_EVENT h = CreateEvent (NULL, FALSE, FALSE, NULL);
*event = h;
if (h == NULL) {
return WELS_THREAD_ERROR_GENERAL;
}
return WELS_THREAD_ERROR_OK;
}
WELS_THREAD_ERROR_CODE WelsEventSignal (WELS_EVENT* event, WELS_MUTEX *pMutex, int* iCondition) {
(*iCondition) --;
if ((*iCondition) <= 0) {
if (SetEvent (*event)) {
return WELS_THREAD_ERROR_OK;
}
}
return WELS_THREAD_ERROR_GENERAL;
}
WELS_THREAD_ERROR_CODE WelsEventWait (WELS_EVENT* event, WELS_MUTEX* pMutex, int& iCondition) {
return WaitForSingleObject (*event, INFINITE);
}
WELS_THREAD_ERROR_CODE WelsEventWaitWithTimeOut (WELS_EVENT* event, uint32_t dwMilliseconds, WELS_MUTEX* pMutex) {
return WaitForSingleObject (*event, dwMilliseconds);
}
WELS_THREAD_ERROR_CODE WelsMultipleEventsWaitSingleBlocking (uint32_t nCount,
WELS_EVENT* event_list, WELS_EVENT* master_even, WELS_MUTEX* pMutext) {
// Don't need/use the master event for anything, since windows has got WaitForMultipleObjects
return WaitForMultipleObjects (nCount, event_list, FALSE, INFINITE);
}
WELS_THREAD_ERROR_CODE WelsEventClose (WELS_EVENT* event, const char* event_name) {
CloseHandle (*event);
*event = NULL;
return WELS_THREAD_ERROR_OK;
}
#ifndef WP80
void WelsSleep (uint32_t dwMilliSecond) {
::Sleep (dwMilliSecond);
}
#else
void WelsSleep (uint32_t dwMilliSecond) {
static WELS_EVENT hSleepEvent = NULL;
if (!hSleepEvent) {
WELS_EVENT hLocalSleepEvent = NULL;
WELS_THREAD_ERROR_CODE ret = WelsEventOpen (&hLocalSleepEvent);
if (WELS_THREAD_ERROR_OK != ret) {
return;
}
WELS_EVENT hPreviousEvent = InterlockedCompareExchangePointerRelease (&hSleepEvent, hLocalSleepEvent, NULL);
if (hPreviousEvent) {
WelsEventClose (&hLocalSleepEvent);
}
//On this singleton usage idea of using InterlockedCompareExchangePointerRelease:
// similar idea of can be found at msdn blog when introducing InterlockedCompareExchangePointerRelease
}
WaitForSingleObject (hSleepEvent, dwMilliSecond);
}
#endif
WELS_THREAD_ERROR_CODE WelsThreadCreate (WELS_THREAD_HANDLE* thread, LPWELS_THREAD_ROUTINE routine,
void* arg, WELS_THREAD_ATTR attr) {
WELS_THREAD_HANDLE h = CreateThread (NULL, 0, routine, arg, 0, NULL);
if (h == NULL) {
return WELS_THREAD_ERROR_GENERAL;
}
* thread = h;
return WELS_THREAD_ERROR_OK;
}
WELS_THREAD_ERROR_CODE WelsThreadSetName (const char* thread_name) {
// do nothing
return WELS_THREAD_ERROR_OK;
}
WELS_THREAD_ERROR_CODE WelsThreadJoin (WELS_THREAD_HANDLE thread) {
WaitForSingleObject (thread, INFINITE);
CloseHandle (thread);
return WELS_THREAD_ERROR_OK;
}
WELS_THREAD_HANDLE WelsThreadSelf() {
return GetCurrentThread();
}
WELS_THREAD_ERROR_CODE WelsQueryLogicalProcessInfo (WelsLogicalProcessInfo* pInfo) {
SYSTEM_INFO si;
GetSystemInfo (&si);
pInfo->ProcessorCount = si.dwNumberOfProcessors;
return WELS_THREAD_ERROR_OK;
}
#else //platform: #ifdef _WIN32
WELS_THREAD_ERROR_CODE WelsThreadCreate (WELS_THREAD_HANDLE* thread, LPWELS_THREAD_ROUTINE routine,
void* arg, WELS_THREAD_ATTR attr) {
WELS_THREAD_ERROR_CODE err = 0;
pthread_attr_t at;
err = pthread_attr_init (&at);
if (err)
return err;
#if !defined(__ANDROID__) && !defined(__Fuchsia__)
err = pthread_attr_setscope (&at, PTHREAD_SCOPE_SYSTEM);
if (err)
return err;
err = pthread_attr_setschedpolicy (&at, SCHED_FIFO);
if (err)
return err;
#endif
err = pthread_create (thread, &at, routine, arg);
pthread_attr_destroy (&at);
return err;
}
WELS_THREAD_ERROR_CODE WelsThreadSetName (const char* thread_name) {
#ifdef APPLE_IOS
pthread_setname_np (thread_name);
#endif
#if defined(__ANDROID__) && __ANDROID_API__ >= 9
pthread_setname_np (pthread_self(), thread_name);
#endif
// do nothing
return WELS_THREAD_ERROR_OK;
}
WELS_THREAD_ERROR_CODE WelsThreadJoin (WELS_THREAD_HANDLE thread) {
return pthread_join (thread, NULL);
}
WELS_THREAD_HANDLE WelsThreadSelf() {
return pthread_self();
}
// unnamed semaphores aren't supported on OS X
WELS_THREAD_ERROR_CODE WelsEventOpen (WELS_EVENT* p_event, const char* event_name) {
#ifdef __APPLE__
WELS_THREAD_ERROR_CODE err= pthread_cond_init (p_event, NULL);
return err;
#else
WELS_EVENT event = (WELS_EVENT) malloc (sizeof (*event));
if (event == NULL){
*p_event = NULL;
return WELS_THREAD_ERROR_GENERAL;
}
WELS_THREAD_ERROR_CODE err = sem_init (event, 0, 0);
if (!err) {
*p_event = event;
return err;
}
free (event);
*p_event = NULL;
return err;
#endif
}
WELS_THREAD_ERROR_CODE WelsEventClose (WELS_EVENT* event, const char* event_name) {
//printf("event_close:%x, %s\n", event, event_name);
#ifdef __APPLE__
WELS_THREAD_ERROR_CODE err = pthread_cond_destroy (event);
return err;
#else
WELS_THREAD_ERROR_CODE err = sem_destroy (*event); // match with sem_init
free (*event);
*event = NULL;
return err;
#endif
}
void WelsSleep (uint32_t dwMilliSecond) {
usleep (dwMilliSecond * 1000);
}
WELS_THREAD_ERROR_CODE WelsEventSignal (WELS_EVENT* event, WELS_MUTEX *pMutex, int* iCondition) {
WELS_THREAD_ERROR_CODE err = 0;
//fprintf( stderr, "before signal it, event=%x iCondition= %d..\n", event, *iCondition );
#ifdef __APPLE__
WelsMutexLock (pMutex);
(*iCondition) --;
WelsMutexUnlock (pMutex);
if ((*iCondition) <= 0) {
err = pthread_cond_signal (event);
//fprintf( stderr, "signal it, event=%x iCondition= %d..\n",event, *iCondition );
}
#else
(*iCondition) --;
if ((*iCondition) <= 0) {
// int32_t val = 0;
// sem_getvalue(event, &val);
// fprintf( stderr, "before signal it, val= %d..\n",val );
if (event != NULL)
err = sem_post (*event);
// sem_getvalue(event, &val);
//fprintf( stderr, "signal it, event=%x iCondition= %d..\n",event, *iCondition );
}
#endif
//fprintf( stderr, "after signal it, event=%x iCondition= %d..\n",event, *iCondition );
return err;
}
WELS_THREAD_ERROR_CODE WelsEventWait (WELS_EVENT* event, WELS_MUTEX* pMutex, int& iCondition) {
#ifdef __APPLE__
int err = 0;
WelsMutexLock(pMutex);
//fprintf( stderr, "WelsEventWait event %x %d..\n", event, iCondition );
while (iCondition>0) {
err = pthread_cond_wait (event, pMutex);
}
WelsMutexUnlock(pMutex);
return err;
#else
return sem_wait (*event); // blocking until signaled
#endif
}
WELS_THREAD_ERROR_CODE WelsEventWaitWithTimeOut (WELS_EVENT* event, uint32_t dwMilliseconds, WELS_MUTEX* pMutex) {
if (dwMilliseconds != (uint32_t) - 1) {
#if defined(__APPLE__)
return pthread_cond_wait (event, pMutex);
#else
return sem_wait (*event);
#endif
} else {
struct timespec ts;
struct timeval tv;
gettimeofday (&tv, 0);
ts.tv_nsec = tv.tv_usec * 1000 + dwMilliseconds * 1000000;
ts.tv_sec = tv.tv_sec + ts.tv_nsec / 1000000000;
ts.tv_nsec %= 1000000000;
#if defined(__APPLE__)
return pthread_cond_timedwait (event, pMutex, &ts);
#else
return sem_timedwait (*event, &ts);
#endif
}
}
WELS_THREAD_ERROR_CODE WelsMultipleEventsWaitSingleBlocking (uint32_t nCount,
WELS_EVENT* event_list, WELS_EVENT* master_event, WELS_MUTEX* pMutex) {
uint32_t nIdx = 0;
uint32_t uiAccessTime = 2; // 2 us once
if (nCount == 0)
return WELS_THREAD_ERROR_WAIT_FAILED;
#if defined(__APPLE__)
if (master_event != NULL) {
// This design relies on the events actually being semaphores;
// if multiple events in the list have been signalled, the master
// event should have a similar count (events in windows can't keep
// track of the actual count, but the master event isn't needed there
// since it uses WaitForMultipleObjects).
int32_t err = pthread_cond_wait (master_event, pMutex);
if (err != WELS_THREAD_ERROR_OK)
return err;
uiAccessTime = 0; // no blocking, just quickly loop through all to find the one that was signalled
}
while (1) {
nIdx = 0; // access each event by order
while (nIdx < nCount) {
int32_t err = 0;
int32_t wait_count = 0;
/*
* although such interface is not used in __GNUC__ like platform, to use
* pthread_cond_timedwait() might be better choice if need
*/
do {
err = pthread_cond_wait (&event_list[nIdx], pMutex);
if (WELS_THREAD_ERROR_OK == err)
return WELS_THREAD_ERROR_WAIT_OBJECT_0 + nIdx;
else if (wait_count > 0 || uiAccessTime == 0)
break;
usleep (uiAccessTime);
++ wait_count;
} while (1);
// we do need access next event next time
++ nIdx;
}
usleep (1); // switch to working threads
if (master_event != NULL) {
// A master event was used and was signalled, but none of the events in the
// list was found to be signalled, thus wait a little more when rechecking
// the list to avoid busylooping here.
// If we ever hit this codepath it's mostly a bug in the code that signals
// the events.
uiAccessTime = 2;
}
}
#else
if (master_event != NULL) {
// This design relies on the events actually being semaphores;
// if multiple events in the list have been signalled, the master
// event should have a similar count (events in windows can't keep
// track of the actual count, but the master event isn't needed there
// since it uses WaitForMultipleObjects).
int32_t err = sem_wait (*master_event);
if (err != WELS_THREAD_ERROR_OK)
return err;
uiAccessTime = 0; // no blocking, just quickly loop through all to find the one that was signalled
}
while (1) {
nIdx = 0; // access each event by order
while (nIdx < nCount) {
int32_t err = 0;
int32_t wait_count = 0;
/*
* although such interface is not used in __GNUC__ like platform, to use
* pthread_cond_timedwait() might be better choice if need
*/
do {
err = sem_trywait (event_list[nIdx]);
if (WELS_THREAD_ERROR_OK == err)
return WELS_THREAD_ERROR_WAIT_OBJECT_0 + nIdx;
else if (wait_count > 0 || uiAccessTime == 0)
break;
usleep (uiAccessTime);
++ wait_count;
} while (1);
// we do need access next event next time
++ nIdx;
}
usleep (1); // switch to working threads
if (master_event != NULL) {
// A master event was used and was signalled, but none of the events in the
// list was found to be signalled, thus wait a little more when rechecking
// the list to avoid busylooping here.
// If we ever hit this codepath it's mostly a bug in the code that signals
// the events.
uiAccessTime = 2;
}
}
#endif
return WELS_THREAD_ERROR_WAIT_FAILED;
}
WELS_THREAD_ERROR_CODE WelsQueryLogicalProcessInfo (WelsLogicalProcessInfo* pInfo) {
#ifdef ANDROID_NDK
pInfo->ProcessorCount = android_getCpuCount();
return WELS_THREAD_ERROR_OK;
#elif defined(__linux__)
cpu_set_t cpuset;
CPU_ZERO (&cpuset);
if (!sched_getaffinity (0, sizeof (cpuset), &cpuset)) {
#ifdef CPU_COUNT
pInfo->ProcessorCount = CPU_COUNT (&cpuset);
#else
int32_t count = 0;
for (int i = 0; i < CPU_SETSIZE; i++) {
if (CPU_ISSET (i, &cpuset)) {
count++;
}
}
pInfo->ProcessorCount = count;
#endif
} else {
pInfo->ProcessorCount = 1;
}
return WELS_THREAD_ERROR_OK;
#elif defined(__EMSCRIPTEN__)
// There is not yet a way to determine CPU count in emscripten JS environment.
pInfo->ProcessorCount = 1;
return WELS_THREAD_ERROR_OK;
#elif defined(__Fuchsia__)
pInfo->ProcessorCount = sysconf(_SC_NPROCESSORS_ONLN);
return WELS_THREAD_ERROR_OK;
#else
size_t len = sizeof (pInfo->ProcessorCount);
#if defined(__OpenBSD__)
int scname[] = { CTL_HW, HW_NCPU };
if (sysctl (scname, 2, &pInfo->ProcessorCount, &len, NULL, 0) == -1)
#else
if (sysctlbyname (HW_NCPU_NAME, &pInfo->ProcessorCount, &len, NULL, 0) == -1)
#endif
pInfo->ProcessorCount = 1;
return WELS_THREAD_ERROR_OK;
#endif//__linux__
}
#endif