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/*
* messagebuffer.h -- realtime-safe message interface for jackd.
*
* This function is included in libjack so backend drivers can use
* it, *not* for external client processes. The VERBOSE() and
* MESSAGE() macros are realtime-safe.
*/
/*
* Copyright (C) 2004 Rui Nuno Capela, Steve Harris
* Copyright (C) 2008 Nedko Arnaudov
* Copyright (C) 2008 Grame
*
* 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.
*
*/
#ifndef __JackMessageBuffer__
#define __JackMessageBuffer__
#include "JackPlatformPlug.h"
#include "JackMutex.h"
#include "JackAtomic.h"
namespace Jack
{
/* MB_NEXT() relies on the fact that MB_BUFFERS is a power of two */
#define MB_BUFFERS 128
#define MB_NEXT(index) ((index+1) & (MB_BUFFERS-1))
#define MB_BUFFERSIZE 256 /* message length limit */
struct JackMessage
{
int level;
char message[MB_BUFFERSIZE];
};
/*!
\brief Message buffer to be used from RT threads.
*/
class JackMessageBuffer : public JackRunnableInterface
{
private:
volatile JackThreadInitCallback fInit;
void* fInitArg;
JackMessage fBuffers[MB_BUFFERS];
JackThread fThread;
JackProcessSync fGuard;
volatile unsigned int fInBuffer;
volatile unsigned int fOutBuffer;
SInt32 fOverruns;
bool fRunning;
void Flush();
bool Start();
bool Stop();
public:
JackMessageBuffer();
~JackMessageBuffer();
// JackRunnableInterface interface
bool Execute();
bool static Create();
bool static Destroy();
void AddMessage(int level, const char *message);
int SetInitCallback(JackThreadInitCallback callback, void *arg);
static JackMessageBuffer* fInstance;
};
#ifdef __cplusplus
extern "C"
{
#endif
void JackMessageBufferAdd(int level, const char *message);
#ifdef __cplusplus
}
#endif
};
#endif
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