common/JackMessageBuffer.cpp

   1 /*
   2  *  Copyright (C) 2004 Rui Nuno Capela, Steve Harris
   3  *  Copyright (C) 2008 Nedko Arnaudov
   4  *  Copyright (C) 2008 Grame
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU Lesser General Public License as published by
   8  *  the Free Software Foundation; either version 2.1 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU Lesser General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU Lesser General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  *
  20  */
  21
  22 #include "JackMessageBuffer.h"
  23 #include "JackGlobals.h"
  24 #include "JackError.h"
  25
  26 namespace Jack
  27 {
  28
  29 JackMessageBuffer* JackMessageBuffer::fInstance = NULL;
  30
  31 JackMessageBuffer::JackMessageBuffer()
  32     :fThread(this),fInBuffer(0),fOutBuffer(0),fOverruns(0),fRunning(false)
  33 {}
  34
  35 JackMessageBuffer::~JackMessageBuffer()
  36 {}
  37
  38 void JackMessageBuffer::Start()
  39 {
  40     fRunning = true;
  41     fThread.StartSync();
  42 }
  43
  44 void JackMessageBuffer::Stop()
  45 {
  46     if (fOverruns > 0) {
  47         jack_error("WARNING: %d message buffer overruns!", fOverruns);
  48     } else {
  49         jack_info("no message buffer overruns");
  50     }
  51     fGuard.Lock();
  52     fRunning = false;
  53     fGuard.Signal();
  54     fGuard.Unlock();
  55     fThread.Stop();
  56     Flush();
  57 }
  58
  59 void JackMessageBuffer::Flush()
  60 {
  61     while (fOutBuffer != fInBuffer) {
  62         jack_log_function(fBuffers[fOutBuffer].level, fBuffers[fOutBuffer].message);
  63         fOutBuffer = MB_NEXT(fOutBuffer);
  64     }
  65 }
  66
  67 void JackMessageBuffer::AddMessage(int level, const char *message)
  68 {
  69     if (fGuard.Trylock()) {
  70         fBuffers[fInBuffer].level = level;
  71         strncpy(fBuffers[fInBuffer].message, message, MB_BUFFERSIZE);
  72         fInBuffer = MB_NEXT(fInBuffer);
  73         fGuard.Signal();
  74         fGuard.Unlock();
  75     } else {            /* lock collision */
  76         INC_ATOMIC(&fOverruns);
  77     }
  78 }
  79
  80 bool JackMessageBuffer::Execute()
  81 {
  82     while (fRunning) {
  83         fGuard.Lock();
  84         fGuard.Wait();
  85         Flush();
  86         fGuard.Unlock();
  87     }
  88     return false;
  89 }
  90
  91 void JackMessageBuffer::Create()
  92 {
  93     if (fInstance == NULL) {
  94         fInstance = new JackMessageBuffer();
  95         fInstance->Start();
  96     }
  97 }
  98
  99 void JackMessageBuffer::Destroy()
 100 {
 101     if (fInstance != NULL) {
 102         fInstance->Stop();
 103         delete fInstance;
 104         fInstance = NULL;
 105     }
 106 }
 107
 108 void JackMessageBufferAdd(int level, const char *message)
 109 {
 110     if (Jack::JackMessageBuffer::fInstance == NULL) {
 111         /* Unable to print message with realtime safety. Complain and print it anyway. */
 112         jack_log_function(LOG_LEVEL_ERROR, "messagebuffer not initialized, skip message");
 113     } else {
 114         Jack::JackMessageBuffer::fInstance->AddMessage(level, message);
 115     }
 116 }
 117
 118 };
 119