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