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JackPosixThread.cpp
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JackPosixThread.cpp
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/*
Copyright (C) 2001 Paul Davis
Copyright (C) 2004-2006 Grame
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "JackPosixThread.h"
#include "JackError.h"
#include <string.h> // for memset
namespace Jack
{
void* JackPosixThread::ThreadHandler(void* arg)
{
JackPosixThread* obj = (JackPosixThread*)arg;
JackRunnableInterface* runnable = obj->fRunnable;
int err;
if ((err = pthread_setcanceltype(obj->fCancellation, NULL)) != 0) {
jack_error("pthread_setcanceltype err = %s", strerror(err));
}
// Call Init method
if (!runnable->Init()) {
jack_error("Thread init fails: thread quits");
return 0;
}
JackLog("ThreadHandler: start\n");
// If Init succeed, start the thread loop
bool res = true;
while (obj->fRunning && res) {
res = runnable->Execute();
//pthread_testcancel();
}
JackLog("ThreadHandler: exit\n");
return 0;
}
int JackPosixThread::Start()
{
int res;
fRunning = true;
if (fRealTime) {
JackLog("Create RT thread\n");
/* Get the client thread to run as an RT-FIFO
scheduled thread of appropriate priority.
*/
pthread_attr_t attributes;
struct sched_param rt_param;
pthread_attr_init(&attributes);
if ((res = pthread_attr_setinheritsched(&attributes, PTHREAD_EXPLICIT_SCHED))) {
jack_error("Cannot request explicit scheduling for RT thread %d %s", res, strerror(errno));
return -1;
}
if ((res = pthread_attr_setdetachstate(&attributes, PTHREAD_CREATE_JOINABLE))) {
jack_error("Cannot request joinable thread creation for RT thread %d %s", res, strerror(errno));
return -1;
}
if ((res = pthread_attr_setscope(&attributes, PTHREAD_SCOPE_SYSTEM))) {
jack_error("Cannot set scheduling scope for RT thread %d %s", res, strerror(errno));
return -1;
}
//if ((res = pthread_attr_setschedpolicy(&attributes, SCHED_FIFO))) {
if ((res = pthread_attr_setschedpolicy(&attributes, SCHED_RR))) {
jack_error("Cannot set FIFO scheduling class for RT thread %d %s", res, strerror(errno));
return -1;
}
if ((res = pthread_attr_setscope(&attributes, PTHREAD_SCOPE_SYSTEM))) {
jack_error("Cannot set scheduling scope for RT thread %d %s", res, strerror(errno));
return -1;
}
memset(&rt_param, 0, sizeof(rt_param));
rt_param.sched_priority = fPriority;
if ((res = pthread_attr_setschedparam(&attributes, &rt_param))) {
jack_error("Cannot set scheduling priority for RT thread %d %s", res, strerror(errno));
return -1;
}
if ((res = pthread_create(&fThread, &attributes, ThreadHandler, this))) {
jack_error("Cannot set create thread %d %s", res, strerror(errno));
return -1;
}
return 0;
} else {
JackLog("Create non RT thread\n");
if ((res = pthread_create(&fThread, 0, ThreadHandler, this))) {
jack_error("Cannot set create thread %d %s", res, strerror(errno));
return -1;
}
return 0;
}
}
int JackPosixThread::StartSync()
{
jack_error("Not implemented yet");
return -1;
}
int JackPosixThread::Kill()
{
if (fThread) { // If thread has been started
JackLog("JackPosixThread::Kill\n");
void* status;
pthread_cancel(fThread);
pthread_join(fThread, &status);
fRunning = false;
fThread = (pthread_t)NULL;
return 0;
} else {
return -1;
}
}
int JackPosixThread::Stop()
{
if (fThread) { // If thread has been started
JackLog("JackPosixThread::Stop\n");
void* status;
fRunning = false; // Request for the thread to stop
pthread_join(fThread, &status);
fThread = (pthread_t)NULL;
return 0;
} else {
return -1;
}
}
int JackPosixThread::AcquireRealTime()
{
struct sched_param rtparam;
int res;
if (!fThread)
return -1;
memset(&rtparam, 0, sizeof(rtparam));
rtparam.sched_priority = fPriority;
//if ((res = pthread_setschedparam(fThread, SCHED_FIFO, &rtparam)) != 0) {
if ((res = pthread_setschedparam(fThread, SCHED_RR, &rtparam)) != 0) {
jack_error("Cannot use real-time scheduling (FIFO/%d) "
"(%d: %s)", rtparam.sched_priority, res,
strerror(res));
return -1;
}
return 0;
}
int JackPosixThread::AcquireRealTime(int priority)
{
fPriority = priority;
return AcquireRealTime();
}
int JackPosixThread::DropRealTime()
{
struct sched_param rtparam;
int res;
if (!fThread)
return -1;
memset(&rtparam, 0, sizeof(rtparam));
rtparam.sched_priority = 0;
if ((res = pthread_setschedparam(fThread, SCHED_OTHER, &rtparam)) != 0) {
jack_error("Cannot switch to normal scheduling priority(%s)\n", strerror(errno));
return -1;
}
return 0;
}
pthread_t JackPosixThread::GetThreadID()
{
return fThread;
}
} // end of namespace