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File: [Pegasus] / pegasus / src / Pegasus / Common / Mutex.h
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Revision: 1.9, Tue Oct 3 16:34:53 2006 UTC (17 years, 9 months ago) by kumpf Branch: MAIN CVS Tags: TASK-TASK-BUG4011_WinLocalConnect-branch-New-root, TASK-TASK-BUG4011_WinLocalConnect-branch-New-merged_out_to_branch, TASK-TASK-BUG4011_WinLocalConnect-branch-New-merged_out_from_trunk, TASK-TASK-BUG4011_WinLocalConnect-branch-New-merged_in_to_trunk, TASK-TASK-BUG4011_WinLocalConnect-branch-New-merged_in_from_branch, TASK-TASK-BUG4011_WinLocalConnect-branch-New-branch, TASK-PEP291_IPV6-root, TASK-PEP291_IPV6-branch, TASK-PEP286_PRIVILEGE_SEPARATION-root, TASK-PEP286_PRIVILEGE_SEPARATION-branch, TASK-PEP274_dacim-root, TASK-PEP274_dacim-merged_out_to_branch, TASK-PEP274_dacim-merged_out_from_trunk, TASK-PEP274_dacim-merged_in_to_trunk, TASK-PEP274_dacim-merged_in_from_branch, TASK-PEP274_dacim-branch, TASK-PEP268_SSLClientCertificatePropagation-root, TASK-PEP268_SSLClientCertificatePropagation-merged_out_to_branch, TASK-PEP268_SSLClientCertificatePropagation-merged_out_from_trunk, TASK-PEP268_SSLClientCertificatePropagation-merged_in_to_trunk, TASK-PEP268_SSLClientCertificatePropagation-merged_in_from_branch, TASK-PEP268_SSLClientCertificatePropagation-branch, TASK-PEP267_SLPReregistrationSupport-root, TASK-PEP267_SLPReregistrationSupport-merging_out_to_branch, TASK-PEP267_SLPReregistrationSupport-merging_out_from_trunk, TASK-PEP267_SLPReregistrationSupport-merged_out_to_branch, TASK-PEP267_SLPReregistrationSupport-merged_out_from_trunk, TASK-PEP267_SLPReregistrationSupport-merged_in_to_trunk, TASK-PEP267_SLPReregistrationSupport-merged_in_from_branch, TASK-PEP267_SLPReregistrationSupport-branch, TASK-Bugs5690_3913_RemoteCMPI-root, TASK-Bugs5690_3913_RemoteCMPI-merged_out_to_branch, TASK-Bugs5690_3913_RemoteCMPI-merged_out_from_trunk, TASK-Bugs5690_3913_RemoteCMPI-merged_in_to_trunk, TASK-Bugs5690_3913_RemoteCMPI-merged_in_from_branch, TASK-Bugs5690_3913_RemoteCMPI-branch, TASK-Bug2102_RCMPIWindows-root, TASK-Bug2102_RCMPIWindows-merged_out_to_branch, TASK-Bug2102_RCMPIWindows-merged_out_from_trunk, TASK-Bug2102_RCMPIWindows-merged_in_to_trunk, TASK-Bug2102_RCMPIWindows-merged_in_from_branch, TASK-Bug2102_RCMPIWindows-branch, TASK-Bug2102Final-root, TASK-Bug2102Final-merged_out_to_branch, TASK-Bug2102Final-merged_out_from_trunk, TASK-Bug2102Final-merged_in_to_trunk, TASK-Bug2102Final-merged_in_from_branch, TASK-Bug2102Final-branch, TASK-Bug2021_RemoteCMPIonWindows-root, TASK-Bug2021_RemoteCMPIonWindows-merged_out_to_branch, TASK-Bug2021_RemoteCMPIonWindows-merged_out_from_trunk, TASK-Bug2021_RemoteCMPIonWindows-merged_in_to_trunk, TASK-Bug2021_RemoteCMPIonWindows-merged_in_from_branch, TASK-Bug2021_RemoteCMPIonWindows-branch, TASK-Bug2021_RCMPIonWindows-root, TASK-Bug2021_RCMPIonWindows-merged_out_to_branch, TASK-Bug2021_RCMPIonWindows-merged_out_from_trunk, TASK-Bug2021_RCMPIonWindows-merged_in_to_trunk, TASK-Bug2021_RCMPIonWindows-merged_in_from_branch, TASK-Bug2021_RCMPIonWindows-branch, TASK-BUG7240-root, TASK-BUG7240-branch, TASK-BUG4011_WinLocalConnect-branch-New, RELEASE_2_6_3-RC2, RELEASE_2_6_3-RC1, RELEASE_2_6_3, RELEASE_2_6_2-RC1, RELEASE_2_6_2, RELEASE_2_6_1-RC1, RELEASE_2_6_1, RELEASE_2_6_0-RC1, RELEASE_2_6_0-FC, RELEASE_2_6_0, RELEASE_2_6-root, RELEASE_2_6-branch-clean, RELEASE_2_6-branch, PEP286_PRIVILEGE_SEPARATION_ROOT, PEP286_PRIVILEGE_SEPARATION_CODE_FREEZE, PEP286_PRIVILEGE_SEPARATION_BRANCH, PEP286_PRIVILEGE_SEPARATION_1 Changes since 1.8: +76 -0 lines BUG#: 5595 TITLE: Tracer Mutex is not fork safe DESCRIPTION: Control the status of the trace file mutex across fork() calls. |
//%2006//////////////////////////////////////////////////////////////////////// // // Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development // Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems. // Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.; // IBM Corp.; EMC Corporation, The Open Group. // Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.; // IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group. // Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.; // EMC Corporation; VERITAS Software Corporation; The Open Group. // Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.; // EMC Corporation; Symantec Corporation; The Open Group. // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to // deal in the Software without restriction, including without limitation the // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or // sell copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. // //============================================================================== // //%///////////////////////////////////////////////////////////////////////////// #ifndef Pegasus_Mutex_h #define Pegasus_Mutex_h #include <Pegasus/Common/Config.h> #include <Pegasus/Common/Linkage.h> #include <Pegasus/Common/IPCExceptions.h> #include <Pegasus/Common/Magic.h> #include <Pegasus/Common/Threads.h> PEGASUS_NAMESPACE_BEGIN //============================================================================== // // MutexRep // //============================================================================== #if defined(PEGASUS_HAVE_PTHREADS) typedef pthread_mutex_t MutexType; inline void mutex_lock(MutexType* mutex) { pthread_mutex_lock(mutex); } inline void mutex_unlock(MutexType* mutex) { pthread_mutex_unlock(mutex); } struct MutexRep { pthread_mutex_t mutex; int count; }; # define PEGASUS_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER #endif #if defined(PEGASUS_HAVE_WINDOWS_THREADS) typedef HANDLE MutexType; inline void mutex_lock(MutexType* m) { WaitForSingleObject(*m, INFINITE); } inline void mutex_unlock(MutexType* m) { ReleaseMutex(*m); } struct MutexRep { MutexType handle; size_t count; }; # define PEGASUS_MUTEX_INITIALIZER (CreateMutex(NULL, FALSE, NULL)) #endif //============================================================================== // // Mutex // //============================================================================== class PEGASUS_COMMON_LINKAGE Mutex { public: enum RecursiveTag { RECURSIVE }; enum NonRecursiveTag { NON_RECURSIVE }; /** Default constructor creates a recursive mutex. */ Mutex(); /** Call as Mutex(Mutex::RECURSIVE) to create a recursive mutex. */ Mutex(RecursiveTag); /** Call as Mutex(Mutex::NON_RECURSIVE) to create a non-recursive mutex. */ Mutex(NonRecursiveTag); ~Mutex(); void lock(); void try_lock(); void timed_lock(Uint32 milliseconds); void unlock(); #if defined(PEGASUS_OS_LINUX) /** This method must only be called after a fork() to reset the mutex lock status in the new process. Any other use of this method is unsafe. */ void reinitialize(); #endif private: Mutex(const Mutex&); Mutex& operator=(const Mutex&); MutexRep _rep; Magic<0x57D11485> _magic; friend class Condition; }; //============================================================================== // // AutoMutex // //============================================================================== class PEGASUS_COMMON_LINKAGE AutoMutex { public: AutoMutex(Mutex& mutex) : _mutex(mutex) { _mutex.lock(); } ~AutoMutex() { _mutex.unlock(); } private: AutoMutex(); // Unimplemented AutoMutex(const AutoMutex& x); // Unimplemented AutoMutex& operator=(const AutoMutex& x); // Unimplemented Mutex& _mutex; }; //============================================================================== // // PEGASUS_FORK_SAFE_MUTEX // //============================================================================== // Use of this macro ensures that a static Mutex is not locked across a fork(). #if !defined(PEGASUS_HAVE_PTHREADS) || \ defined(PEGASUS_OS_ZOS) || \ defined(PEGASUS_OS_VMS) # define PEGASUS_FORK_SAFE_MUTEX(mutex) #elif defined(PEGASUS_OS_LINUX) # define PEGASUS_FORK_SAFE_MUTEX(mutex) \ class ForkSafeMutex ## mutex \ { \ public: \ ForkSafeMutex ## mutex() \ { \ pthread_atfork( \ 0, \ 0, \ _reinitializeMutex); \ } \ \ private: \ static void _reinitializeMutex() \ { \ mutex.reinitialize(); \ } \ }; \ \ static ForkSafeMutex ## mutex __forkSafeMutex ## mutex; #else # define PEGASUS_FORK_SAFE_MUTEX(mutex) \ class ForkSafeMutex ## mutex \ { \ public: \ ForkSafeMutex ## mutex() \ { \ pthread_atfork( \ _lockMutex, \ _unlockMutex, \ _unlockMutex); \ } \ \ private: \ static void _lockMutex() \ { \ mutex.lock(); \ } \ \ static void _unlockMutex() \ { \ mutex.unlock(); \ } \ }; \ \ static ForkSafeMutex ## mutex __forkSafeMutex ## mutex; #endif PEGASUS_NAMESPACE_END #endif /* Pegasus_Mutex_h */
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