mirror of
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66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
/* EQEMu: Everquest Server Emulator
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Copyright (C) 2001-2013 EQEMu Development Team (http://eqemulator.net)
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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 General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY except by those people which sell it, which
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are required to give you total support for your newly bought product;
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without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU 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 _MUTEX_H_
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#define _MUTEX_H_
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#include <string>
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namespace EQEmu {
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//! Interprocess Named Binary Semaphore (Mutex)
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/*!
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Important to note: while this can be used to synchronize processes, it is not in itself re-entrant or thread-safe
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and thus should be used from one thread and non-recursively. It was intended to be a simple synchronization method
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for our MemoryMappedFile loading.
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*/
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class IPCMutex {
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struct Implementation;
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public:
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//! Constructor
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/*!
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Creates a named binary semaphore, basically a semaphore that is init S <- 1
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\param name The name of this mutex.
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*/
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IPCMutex(std::string name);
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//! Destructor
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~IPCMutex();
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//! Lock the mutex
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/*!
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Same basic function as P(): for(;;) { if(S > 0) { S -= 1; break; } }
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*/
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bool Lock();
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//! Unlocks the mutex
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/*!
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Same basic function as V(): S += 1;
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*/
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bool Unlock();
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private:
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IPCMutex(const IPCMutex&);
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const IPCMutex& operator=(const IPCMutex&);
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bool locked_; //!< Whether this mutex is locked or not
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Implementation *imp_;
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};
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}
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#endif
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