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File: [Pegasus] / pegasus / src / Pegasus / Common / ReadWriteSem.h
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Revision: 1.3, Fri Nov 10 18:14:58 2006 UTC (17 years, 7 months ago) by kumpf Branch: MAIN CVS Tags: TASK-PEP286_PRIVILEGE_SEPARATION-root, TASK-PEP286_PRIVILEGE_SEPARATION-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-BUG7240-root, TASK-BUG7240-branch, 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 1.2: +1 -5 lines BUG#: 5840 TITLE: Common modules do not meet chksrc requirements DESCRIPTION: Remove tab characters and author names and shorten lines that are wider than 80 characters. |
//%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_ReadWriteSem_h #define Pegasus_ReadWriteSem_h #include <Pegasus/Common/Config.h> #include <Pegasus/Common/Linkage.h> #include <Pegasus/Common/Semaphore.h> #include <Pegasus/Common/Mutex.h> #include <Pegasus/Common/AtomicInt.h> #define PEG_SEM_READ 1 #define PEG_SEM_WRITE 2 PEGASUS_NAMESPACE_BEGIN //============================================================================== // // Select the read-write-lock implementation for your platform: // // PEGASUS_USE_POSIX_RWLOCK // PEGASUS_USE_SEMAPHORE_RWLOCK // //============================================================================== #if defined(PEGASUS_PLATFORM_AIX_RS_IBMCXX) # define PEGASUS_USE_POSIX_RWLOCK #elif defined(PEGASUS_PLATFORM_HPUX_ACC) # define PEGASUS_USE_POSIX_RWLOCK #elif defined(PEGASUS_PLATFORM_OS400_ISERIES_IBM) # define PEGASUS_USE_POSIX_RWLOCK #elif defined(PEGASUS_PLATFORM_SOLARIS_SPARC_CC) # define PEGASUS_USE_POSIX_RWLOCK #elif defined(PEGASUS_PLATFORM_TRU64_ALPHA_DECCXX) # define PEGASUS_USE_POSIX_RWLOCK #elif defined(PEGASUS_PLATFORM_ZOS_ZSERIES_IBM) # define PEGASUS_USE_POSIX_RWLOCK #elif defined(PEGASUS_PLATFORM_VMS_IA64_DECCXX) # define PEGASUS_USE_POSIX_RWLOCK #elif defined(PEGASUS_PLATFORM_VMS_ALPHA_DECCXX) # define PEGASUS_USE_POSIX_RWLOCK #elif defined(PEGASUS_PLATFORM_LINUX_X86_64_GNU) # define PEGASUS_USE_POSIX_RWLOCK #else # define PEGASUS_USE_SEMAPHORE_RWLOCK #endif //============================================================================== // // ReadWriteSemRep // //============================================================================== #ifdef PEGASUS_USE_POSIX_RWLOCK struct ReadWriteSemRep { pthread_rwlock_t rwlock; ThreadType owner; }; #endif /* PEGASUS_USE_POSIX_RWLOCK */ #ifdef PEGASUS_USE_SEMAPHORE_RWLOCK struct ReadWriteSemRep { Semaphore _rlock; Mutex _wlock; Mutex _internal_lock; ThreadType _owner; ReadWriteSemRep() : _rlock(10), _wlock(), _internal_lock(), _owner(Threads::self()) { } }; #endif /* PEGASUS_USE_POSIX_RWLOCK */ //============================================================================== // // ReadWriteSem // //============================================================================== class PEGASUS_COMMON_LINKAGE ReadWriteSem { public: ReadWriteSem(); ~ReadWriteSem(); // @exception Deadlock // @exception Permission // @exception WaitFailed inline void wait_read(ThreadType caller) { wait(PEG_SEM_READ, caller ); } // @exception Deadlock // @exception Permission // @exception WaitFailed inline void wait_write(ThreadType caller) { wait(PEG_SEM_WRITE, caller); } // @exception Deadlock // @exception Permission // @exception AlreadyLocked // @exception WaitFailed inline void try_wait_read(ThreadType caller) { try_wait(PEG_SEM_READ, caller); } // @exception Deadlock // @exception Permission // @exception AlreadyLocked // @exception WaitFailed inline void try_wait_write(ThreadType caller) { try_wait(PEG_SEM_WRITE, caller); } // @exception Deadlock // @exception Permission // @exception TimeOut // @exception WaitFailed inline void timed_wait_read(ThreadType caller, int milliseconds) { timed_wait(PEG_SEM_READ, caller, milliseconds); } // @exception Deadlock // @exception Permission // @exception TimeOut // @exception WaitFailed inline void timed_wait_write(ThreadType caller, int milliseconds) { timed_wait(PEG_SEM_WRITE, caller, milliseconds); } // @exception Permission inline void unlock_read(ThreadType caller) { unlock(PEG_SEM_READ, caller); } // @exception Permission inline void unlock_write(ThreadType caller) { unlock(PEG_SEM_WRITE, caller); } int read_count() const; int write_count() const; // @exception Deadlock // @exception Permission // @exception WaitFailed // @exception TooManyReaders void wait(Uint32 mode, ThreadType caller); // @exception Deadlock // @exception Permission // @exception WaitFailed // @exception TooManyReaders void try_wait(Uint32 mode, ThreadType caller); // @exception Timeout // @exception Deadlock // @exception Permission // @exception WaitFailed // @exception TooManyReaders void timed_wait(Uint32 mode, ThreadType caller, int milliseconds); // @exception Permission void unlock(Uint32 mode, ThreadType caller); private: AtomicInt _readers; AtomicInt _writers; ReadWriteSemRep _rwlock; friend void extricate_read_write(void *); }; //============================================================================== // // ReadLock // //============================================================================== class ReadLock { public: ReadLock(ReadWriteSem& rwsem) : _rwsem(rwsem) { _rwsem.wait_read(Threads::self()); } ~ReadLock() { _rwsem.unlock_read(Threads::self()); } private: ReadWriteSem & _rwsem; }; //============================================================================== // // WriteLock // //============================================================================== class WriteLock { public: WriteLock(ReadWriteSem& rwsem) : _rwsem(rwsem) { _rwsem.wait_write(Threads::self()); } ~WriteLock() { _rwsem.unlock_write(Threads::self()); } private: ReadWriteSem & _rwsem; }; PEGASUS_NAMESPACE_END #endif /* Pegasus_ReadWriteSem_h */
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