forked from I2P_Developers/i2p.i2p
135 lines
3.2 KiB
C++
135 lines
3.2 KiB
C++
/*
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* Copyright (c) 2004, Matthew P. Cashdollar <mpc@innographx.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the author nor the names of any contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id$
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*/
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/*
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* Modelled after JThread by Jori Liesenborgs
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*/
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#include "platform.hpp"
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#include "mutex.hpp"
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using namespace Libsockthread;
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/*
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* Creates a mutex
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*/
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Mutex::Mutex()
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{
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#ifdef WINTHREAD
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mutex = CreateMutex(NULL, false, NULL);
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assert(mutex != NULL);
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#else
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int rc = pthread_mutex_init(&mutex, NULL);
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assert(rc == 0);
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#endif
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}
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/*
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* Destroys a mutex
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*/
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Mutex::~Mutex()
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{
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#ifdef WINTHREAD
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BOOL rc = CloseHandle(mutex);
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assert(rc);
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#else
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int rc = pthread_mutex_destroy(&mutex);
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assert(rc == 0);
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#endif
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}
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/*
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* Locks the mutex
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*/
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void Mutex::lock()
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{
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#ifdef WINTHREAD
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DWORD rc = WaitForSingleObject(mutex, INFINITE);
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assert(rc != WAIT_FAILED);
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#else
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int rc = pthread_mutex_lock(&mutex);
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assert(rc == 0);
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#endif
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}
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/*
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* Unlocks the mutex
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*/
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void Mutex::unlock()
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{
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#ifdef WINTHREAD
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BOOL rc = ReleaseMutex(mutex);
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assert(rc);
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#else
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int rc = pthread_mutex_unlock(&mutex);
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assert(rc == 0);
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#endif
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}
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#ifdef UNIT_TEST
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// g++ -Wall -c thread.cpp -o thread.o
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// g++ -Wall -DUNIT_TEST -c mutex.cpp -o mutex.o
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// g++ -Wall -DUNIT_TEST mutex.o thread.o -o mutex -pthread
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#include "thread.hpp"
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Mutex widget;
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int main()
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{
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class Mutex_test : public Thread
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{
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public:
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Mutex_test(int n)
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: testval(n) {}
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void* thread()
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{
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widget.lock();
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cout << "I got it! thread #" << testval << '\n';
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// If this works, only one thread should be able to lock the
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// widget, since it is never unlocked
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return 0;
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}
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private:
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int testval;
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};
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Mutex_test t1(1);
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Mutex_test t2(2);
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Mutex_test t3(3);
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t1.start(); t2.start(); t3.start();
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while (true);
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return 0;
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}
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#endif // UNIT_TEST
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