00001 // 00002 // Mutex_POSIX.h 00003 // 00004 // $Id: //poco/1.3/Foundation/include/Poco/Mutex_POSIX.h#2 $ 00005 // 00006 // Library: Foundation 00007 // Package: Threading 00008 // Module: Mutex 00009 // 00010 // Definition of the MutexImpl and FastMutexImpl classes for POSIX Threads. 00011 // 00012 // Copyright (c) 2004-2008, Applied Informatics Software Engineering GmbH. 00013 // and Contributors. 00014 // 00015 // Permission is hereby granted, free of charge, to any person or organization 00016 // obtaining a copy of the software and accompanying documentation covered by 00017 // this license (the "Software") to use, reproduce, display, distribute, 00018 // execute, and transmit the Software, and to prepare derivative works of the 00019 // Software, and to permit third-parties to whom the Software is furnished to 00020 // do so, all subject to the following: 00021 // 00022 // The copyright notices in the Software and this entire statement, including 00023 // the above license grant, this restriction and the following disclaimer, 00024 // must be included in all copies of the Software, in whole or in part, and 00025 // all derivative works of the Software, unless such copies or derivative 00026 // works are solely in the form of machine-executable object code generated by 00027 // a source language processor. 00028 // 00029 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00030 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00031 // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT 00032 // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE 00033 // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, 00034 // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 00035 // DEALINGS IN THE SOFTWARE. 00036 // 00037 00038 00039 #ifndef Foundation_Mutex_POSIX_INCLUDED 00040 #define Foundation_Mutex_POSIX_INCLUDED 00041 00042 00043 #include "Poco/Foundation.h" 00044 #include "Poco/Exception.h" 00045 #include <pthread.h> 00046 #include <errno.h> 00047 00048 00049 namespace Poco { 00050 00051 00052 class Foundation_API MutexImpl 00053 { 00054 protected: 00055 MutexImpl(); 00056 MutexImpl(bool fast); 00057 ~MutexImpl(); 00058 void lockImpl(); 00059 bool tryLockImpl(); 00060 bool tryLockImpl(long milliseconds); 00061 void unlockImpl(); 00062 00063 private: 00064 pthread_mutex_t _mutex; 00065 }; 00066 00067 00068 class Foundation_API FastMutexImpl: public MutexImpl 00069 { 00070 protected: 00071 FastMutexImpl(); 00072 ~FastMutexImpl(); 00073 }; 00074 00075 00076 // 00077 // inlines 00078 // 00079 inline void MutexImpl::lockImpl() 00080 { 00081 if (pthread_mutex_lock(&_mutex)) 00082 throw SystemException("cannot lock mutex"); 00083 } 00084 00085 00086 inline bool MutexImpl::tryLockImpl() 00087 { 00088 int rc = pthread_mutex_trylock(&_mutex); 00089 if (rc == 0) 00090 return true; 00091 else if (rc == EBUSY) 00092 return false; 00093 else 00094 throw SystemException("cannot lock mutex"); 00095 00096 } 00097 00098 00099 inline void MutexImpl::unlockImpl() 00100 { 00101 if (pthread_mutex_unlock(&_mutex)) 00102 throw SystemException("cannot unlock mutex"); 00103 } 00104 00105 00106 } // namespace Poco 00107 00108 00109 #endif // Foundation_Mutex_POSIX_INCLUDED