208 lines
5.4 KiB
C++
208 lines
5.4 KiB
C++
/*
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* Copyright (C) 2004 Rui Nuno Capela, Steve Harris
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* Copyright (C) 2008 Nedko Arnaudov
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* Copyright (C) 2008 Grame
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include "JackMessageBuffer.h"
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#include "JackGlobals.h"
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#include "JackError.h"
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#include "JackTime.h"
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namespace Jack
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{
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JackMessageBuffer* JackMessageBuffer::fInstance = NULL;
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JackMessageBuffer::JackMessageBuffer()
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:fInit(NULL),
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fInitArg(NULL),
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fThread(this),
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fGuard(),
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fInBuffer(0),
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fOutBuffer(0),
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fOverruns(0),
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fRunning(false)
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{
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static_assert(offsetof(JackMessageBuffer, fOverruns) % sizeof(fOverruns) == 0,
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"fOverruns must be aligned within JackMessageBuffer");
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}
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JackMessageBuffer::~JackMessageBuffer()
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{}
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bool JackMessageBuffer::Start()
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{
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// Before StartSync()...
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fRunning = true;
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if (fThread.StartSync() == 0) {
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return true;
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} else {
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fRunning = false;
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return false;
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}
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}
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bool JackMessageBuffer::Stop()
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{
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if (fOverruns > 0) {
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jack_error("WARNING: %d message buffer overruns!", fOverruns);
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} else {
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jack_log("no message buffer overruns");
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}
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if (fGuard.Lock()) {
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fRunning = false;
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fGuard.Signal();
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fGuard.Unlock();
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fThread.Stop();
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} else {
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fThread.Kill();
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}
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Flush();
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return true;
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}
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void JackMessageBuffer::Flush()
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{
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while (fOutBuffer != fInBuffer) {
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jack_log_function(fBuffers[fOutBuffer].level, fBuffers[fOutBuffer].message);
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fOutBuffer = MB_NEXT(fOutBuffer);
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}
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}
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void JackMessageBuffer::AddMessage(int level, const char *message)
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{
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if (fGuard.Trylock()) {
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fBuffers[fInBuffer].level = level;
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strncpy(fBuffers[fInBuffer].message, message, MB_BUFFERSIZE);
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fInBuffer = MB_NEXT(fInBuffer);
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fGuard.Signal();
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fGuard.Unlock();
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} else { /* lock collision */
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INC_ATOMIC(&fOverruns);
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}
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}
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bool JackMessageBuffer::Execute()
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{
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if (fGuard.Lock()) {
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while (fRunning) {
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fGuard.Wait();
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/* the client asked for all threads to run a thread
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initialization callback, which includes us.
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*/
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if (fInit) {
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fInit(fInitArg);
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fInit = NULL;
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/* and we're done */
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fGuard.Signal();
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}
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/* releasing the mutex reduces contention */
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fGuard.Unlock();
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Flush();
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fGuard.Lock();
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}
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fGuard.Unlock();
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} else {
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jack_error("JackMessageBuffer::Execute lock cannot be taken");
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}
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return false;
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}
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bool JackMessageBuffer::Create()
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{
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if (fInstance == NULL) {
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fInstance = new JackMessageBuffer();
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if (!fInstance->Start()) {
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jack_error("JackMessageBuffer::Create cannot start thread");
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delete fInstance;
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fInstance = NULL;
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return false;
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}
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}
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return true;
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}
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bool JackMessageBuffer::Destroy()
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{
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if (fInstance != NULL) {
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fInstance->Stop();
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delete fInstance;
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fInstance = NULL;
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return true;
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} else {
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return false;
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}
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}
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void JackMessageBufferAdd(int level, const char *message)
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{
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if (Jack::JackMessageBuffer::fInstance == NULL) {
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/* Unable to print message with realtime safety. Complain and print it anyway. */
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jack_log_function(LOG_LEVEL_ERROR, "messagebuffer not initialized, skip message");
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} else {
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Jack::JackMessageBuffer::fInstance->AddMessage(level, message);
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}
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}
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int JackMessageBuffer::SetInitCallback(JackThreadInitCallback callback, void *arg)
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{
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if (fInstance && callback && fRunning && fGuard.Lock()) {
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/* set up the callback */
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fInitArg = arg;
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fInit = callback;
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#ifndef WIN32
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// wake msg buffer thread
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fGuard.Signal();
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// wait for it to be done
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fGuard.Wait();
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// and we're done
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fGuard.Unlock();
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#else
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/*
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The condition variable emulation code does not work reliably on Windows (lost signal).
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So use a "hackish" way to signal/wait for the result.
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Probably better in the long term : use pthread-win32 (http://sourceware.org/pthreads-win32/`
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*/
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fGuard.Unlock();
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int count = 0;
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while (fInit && ++count < 1000) {
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/* wake msg buffer thread */
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fGuard.Signal();
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JackSleep(1000);
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}
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if (count == 1000) {
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jack_error("JackMessageBuffer::SetInitCallback : signal lost");
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return -1;
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}
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#endif
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return 0;
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}
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jack_error("JackMessageBuffer::SetInitCallback : callback could not be executed");
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return -1;
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}
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};
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