87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
/*
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Copyright (C) 2004-2008 Grame
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Copyright (C) 2016 Filipe Coelho
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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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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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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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#ifndef __JackLinuxFutex__
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#define __JackLinuxFutex__
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#include "JackSynchro.h"
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#include "JackCompilerDeps.h"
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#include <stddef.h>
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namespace Jack
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{
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/*!
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\brief Inter process synchronization using Linux futex.
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Based on the JackPosixSemaphore class.
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Adapted to work with linux futex to be as light as possible and also work in multiple architectures.
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Adds a new 'MakePrivate' function that makes the sync happen in the local process only,
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making it even faster for internal clients.
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*/
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class SERVER_EXPORT JackLinuxFutex : public detail::JackSynchro
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{
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private:
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struct FutexData {
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int futex; // futex, needs to be 1st member
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bool internal; // current internal state
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bool wasInternal; // initial internal state, only changes in allocate
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bool needsChange; // change state on next wait call
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int externalCount; // how many external clients have connected
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};
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int fSharedMem;
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FutexData* fFutex;
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bool fPrivate;
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bool fPromiscuous;
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int fPromiscuousGid;
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protected:
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void BuildName(const char* name, const char* server_name, char* res, int size);
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public:
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JackLinuxFutex();
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bool Signal();
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bool SignalAll();
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bool Wait();
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bool TimedWait(long usec);
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bool Allocate(const char* name, const char* server_name, int value, bool internal = false);
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bool Connect(const char* name, const char* server_name);
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bool ConnectInput(const char* name, const char* server_name);
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bool ConnectOutput(const char* name, const char* server_name);
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bool Disconnect();
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void Destroy();
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void MakePrivate(bool priv);
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};
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} // end of namespace
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#endif
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