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79 lines
1.3 KiB
79 lines
1.3 KiB
/*
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thread safe fifo queue for commands
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Copyright (C) 2000 Martin Vogt
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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 Library General Public License as published by
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the Free Software Foundation.
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For more information look at the file COPYRIGHT in this package
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*/
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#ifndef __COMMAND_PIPE_H
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#define __COMMAND_PIPE_H
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#include "command.h"
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/**
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This queue deals with the ugly deadlock problem.
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We insert all commands in a queue and the thread
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polls this queue for next commands.
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*/
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class CommandPipe {
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Command** commandArray;
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int entries;
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int readPos;
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int writePos;
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abs_thread_mutex_t pipeMut;
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abs_thread_cond_t spaceCond;
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abs_thread_cond_t emptyCond;
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abs_thread_cond_t dataCond;
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public:
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CommandPipe();
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~CommandPipe();
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// writer thread:
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void sendCommand(Command& cmd);
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void sendCommandNoWait(Command& cmd);
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void waitForEmptyQueue();
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// reader thread
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int hasCommand(Command* dest);
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void waitForCommand();
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private:
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void sendCommand(Command& cmd,int lWait);
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void lockCommandPipe();
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void unlockCommandPipe();
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// writer thread wait here
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void waitForSpace();
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void waitForEmpty();
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void waitForData();
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// reader thread signals this
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void signalSpace();
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void signalEmpty();
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void signalData();
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};
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#endif
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