jack2/common/JackMessageBuffer.cpp at develop · jackaudio/jack2 · GitHub

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* This program is free software; you can redistribute it and/or modify

* it under the terms of the GNU Lesser General Public License as published by

* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

* You should have received a copy of the GNU Lesser General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

#include "JackMessageBuffer.h"

#include "JackGlobals.h"

#include "JackError.h"

#include "JackTime.h"

namespace Jack

{

JackMessageBuffer* JackMessageBuffer::fInstance = NULL;

JackMessageBuffer::JackMessageBuffer()

:fInit(NULL),

fInitArg(NULL),

fThread(this),

fGuard(),

fInBuffer(0),

fOutBuffer(0),

fOverruns(0),

fRunning(false)

{

static_assert(offsetof(JackMessageBuffer, fOverruns) % sizeof(fOverruns) == 0,

"fOverruns must be aligned within JackMessageBuffer");

}

JackMessageBuffer::~JackMessageBuffer()

{}

bool JackMessageBuffer::Start()

{

// Before StartSync()...

fRunning = true;

if (fThread.StartSync() == 0) {

return true;

} else {

fRunning = false;

return false;

}

bool JackMessageBuffer::Stop()

{

if (fOverruns > 0) {

jack_error("WARNING: %d message buffer overruns!", fOverruns);

} else {

jack_log("no message buffer overruns");

}

if (fGuard.Lock()) {

fRunning = false;

fGuard.Signal();

fGuard.Unlock();

fThread.Stop();

} else {

fThread.Kill();

}

Flush();

return true;

}

void JackMessageBuffer::Flush()

{

while (fOutBuffer != fInBuffer) {

jack_log_function(fBuffers[fOutBuffer].level, fBuffers[fOutBuffer].message);

fOutBuffer = MB_NEXT(fOutBuffer);

}

void JackMessageBuffer::AddMessage(int level, const char *message)

{

if (fGuard.Trylock()) {

fBuffers[fInBuffer].level = level;

strncpy(fBuffers[fInBuffer].message, message, MB_BUFFERSIZE);

fInBuffer = MB_NEXT(fInBuffer);

fGuard.Signal();

fGuard.Unlock();

} else { /* lock collision */

INC_ATOMIC(&fOverruns);

}

bool JackMessageBuffer::Execute()

{

if (fGuard.Lock()) {

while (fRunning) {

fGuard.Wait();

/* the client asked for all threads to run a thread

initialization callback, which includes us.

if (fInit) {

fInit(fInitArg);

fInit = NULL;

/* and we're done */

fGuard.Signal();

}

/* releasing the mutex reduces contention */

fGuard.Unlock();

Flush();

fGuard.Lock();

}

fGuard.Unlock();

} else {

jack_error("JackMessageBuffer::Execute lock cannot be taken");

}

return false;

}

bool JackMessageBuffer::Create()

{

if (fInstance == NULL) {

fInstance = new JackMessageBuffer();

if (!fInstance->Start()) {

jack_error("JackMessageBuffer::Create cannot start thread");

delete fInstance;

fInstance = NULL;

return false;

}

return true;

}

bool JackMessageBuffer::Destroy()

{

if (fInstance != NULL) {

fInstance->Stop();

delete fInstance;

fInstance = NULL;

return true;

} else {

return false;

}

void JackMessageBufferAdd(int level, const char *message)

{

if (Jack::JackMessageBuffer::fInstance == NULL) {

/* Unable to print message with realtime safety. Complain and print it anyway. */

jack_log_function(LOG_LEVEL_ERROR, "messagebuffer not initialized, skip message");

} else {

Jack::JackMessageBuffer::fInstance->AddMessage(level, message);

}

int JackMessageBuffer::SetInitCallback(JackThreadInitCallback callback, void *arg)

{

if (fInstance && callback && fRunning && fGuard.Lock()) {

/* set up the callback */

fInitArg = arg;

fInit = callback;

#ifndef WIN32

// wake msg buffer thread

fGuard.Signal();

// wait for it to be done

fGuard.Wait();

// and we're done

fGuard.Unlock();

#else

The condition variable emulation code does not work reliably on Windows (lost signal).

So use a "hackish" way to signal/wait for the result.

Probably better in the long term : use pthread-win32 (http://sourceware.org/pthreads-win32/`

fGuard.Unlock();

int count = 0;

while (fInit && ++count < 1000) {

/* wake msg buffer thread */

fGuard.Signal();

JackSleep(1000);

}

if (count == 1000) {

jack_error("JackMessageBuffer::SetInitCallback : signal lost");

return -1;

}

#endif

return 0;

}

jack_error("JackMessageBuffer::SetInitCallback : callback could not be executed");

return -1;

}

};

jack2/common/JackMessageBuffer.cpp at develop · jackaudio/jack2 · GitHub

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