version 1.1.2.1, 2006/07/27 23:11:52
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version 1.7.2.2, 2008/08/21 15:06:30
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// | // |
//============================================================================== | //============================================================================== |
// | // |
// Author: Mike Day (mdday@us.ibm.com) |
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// |
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// Reworked By: Mike Brasher (m.brasher@inovadevelopment.com) |
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// |
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//%///////////////////////////////////////////////////////////////////////////// | //%///////////////////////////////////////////////////////////////////////////// |
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#ifndef Pegasus_ReadWriteSem_h | #ifndef Pegasus_ReadWriteSem_h |
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#include <Pegasus/Common/Mutex.h> | #include <Pegasus/Common/Mutex.h> |
#include <Pegasus/Common/AtomicInt.h> | #include <Pegasus/Common/AtomicInt.h> |
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#define PEG_SEM_READ 1 |
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#define PEG_SEM_WRITE 2 |
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PEGASUS_NAMESPACE_BEGIN | PEGASUS_NAMESPACE_BEGIN |
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//============================================================================== | //============================================================================== |
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#if defined(PEGASUS_PLATFORM_AIX_RS_IBMCXX) | #if defined(PEGASUS_PLATFORM_AIX_RS_IBMCXX) |
# define PEGASUS_USE_POSIX_RWLOCK | # define PEGASUS_USE_POSIX_RWLOCK |
#elif defined(PEGASUS_PLATFORM_HPUX_ACC) |
#elif defined(PEGASUS_PLATFORM_PASE_ISERIES_IBMCXX) |
# define PEGASUS_USE_POSIX_RWLOCK | # define PEGASUS_USE_POSIX_RWLOCK |
#elif defined(PEGASUS_PLATFORM_OS400_ISERIES_IBM) |
#elif defined(PEGASUS_PLATFORM_HPUX_ACC) |
# define PEGASUS_USE_POSIX_RWLOCK | # define PEGASUS_USE_POSIX_RWLOCK |
#elif defined(PEGASUS_PLATFORM_SOLARIS_SPARC_CC) |
#elif defined(PEGASUS_OS_SOLARIS) |
# define PEGASUS_USE_POSIX_RWLOCK | # define PEGASUS_USE_POSIX_RWLOCK |
#elif defined(PEGASUS_PLATFORM_TRU64_ALPHA_DECCXX) | #elif defined(PEGASUS_PLATFORM_TRU64_ALPHA_DECCXX) |
# define PEGASUS_USE_POSIX_RWLOCK | # define PEGASUS_USE_POSIX_RWLOCK |
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# define PEGASUS_USE_POSIX_RWLOCK | # define PEGASUS_USE_POSIX_RWLOCK |
#elif defined(PEGASUS_PLATFORM_VMS_ALPHA_DECCXX) | #elif defined(PEGASUS_PLATFORM_VMS_ALPHA_DECCXX) |
# define PEGASUS_USE_POSIX_RWLOCK | # define PEGASUS_USE_POSIX_RWLOCK |
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#elif defined(PEGASUS_PLATFORM_LINUX_X86_64_GNU) |
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# define PEGASUS_USE_POSIX_RWLOCK |
#else | #else |
# define PEGASUS_USE_SEMAPHORE_RWLOCK | # define PEGASUS_USE_SEMAPHORE_RWLOCK |
#endif | #endif |
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struct ReadWriteSemRep | struct ReadWriteSemRep |
{ | { |
pthread_rwlock_t rwlock; | pthread_rwlock_t rwlock; |
pthread_t owner; |
ThreadType owner; |
}; | }; |
#endif /* PEGASUS_USE_POSIX_RWLOCK */ | #endif /* PEGASUS_USE_POSIX_RWLOCK */ |
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~ReadWriteSem(); | ~ReadWriteSem(); |
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// @exception Deadlock |
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// @exception Permission | // @exception Permission |
// @exception WaitFailed | // @exception WaitFailed |
inline void wait_read(ThreadType caller) | inline void wait_read(ThreadType caller) |
{ | { |
wait(PEG_SEM_READ, caller ); |
_wait(false, caller); |
} | } |
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// @exception Deadlock |
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// @exception Permission | // @exception Permission |
// @exception WaitFailed | // @exception WaitFailed |
inline void wait_write(ThreadType caller) | inline void wait_write(ThreadType caller) |
{ | { |
wait(PEG_SEM_WRITE, caller); |
_wait(true, caller); |
} |
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// @exception Deadlock |
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// @exception Permission |
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// @exception AlreadyLocked |
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// @exception WaitFailed |
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inline void try_wait_read(ThreadType caller) |
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{ |
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try_wait(PEG_SEM_READ, caller); |
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} |
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// @exception Deadlock |
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// @exception Permission |
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// @exception AlreadyLocked |
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// @exception WaitFailed |
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inline void try_wait_write(ThreadType caller) |
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{ |
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try_wait(PEG_SEM_WRITE, caller); |
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} |
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// @exception Deadlock |
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// @exception Permission |
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// @exception TimeOut |
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// @exception WaitFailed |
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inline void timed_wait_read(ThreadType caller, int milliseconds) |
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{ |
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timed_wait(PEG_SEM_READ, caller, milliseconds); |
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} |
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// @exception Deadlock |
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// @exception Permission |
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// @exception TimeOut |
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// @exception WaitFailed |
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inline void timed_wait_write(ThreadType caller, int milliseconds) |
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{ |
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timed_wait(PEG_SEM_WRITE, caller, milliseconds); |
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} | } |
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// @exception Permission | // @exception Permission |
inline void unlock_read(ThreadType caller) | inline void unlock_read(ThreadType caller) |
{ | { |
unlock(PEG_SEM_READ, caller); |
_unlock(false, caller); |
} | } |
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// @exception Permission | // @exception Permission |
inline void unlock_write(ThreadType caller) | inline void unlock_write(ThreadType caller) |
{ | { |
unlock(PEG_SEM_WRITE, caller); |
_unlock(true, caller); |
} | } |
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int read_count() const; | int read_count() const; |
int write_count() const; | int write_count() const; |
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// @exception Deadlock |
private: |
// @exception Permission |
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// @exception WaitFailed |
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// @exception TooManyReaders |
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void wait(Uint32 mode, ThreadType caller); |
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// @exception Deadlock |
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// @exception Permission |
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// @exception WaitFailed |
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// @exception TooManyReaders |
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void try_wait(Uint32 mode, ThreadType caller); |
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// @exception Timeout |
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// @exception Deadlock |
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// @exception Permission | // @exception Permission |
// @exception WaitFailed | // @exception WaitFailed |
// @exception TooManyReaders |
void _wait(Boolean writeLock, ThreadType caller); |
void timed_wait(Uint32 mode, ThreadType caller, int milliseconds); |
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// @exception Permission | // @exception Permission |
void unlock(Uint32 mode, ThreadType caller); |
void _unlock(Boolean writeLock, ThreadType caller); |
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private: |
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AtomicInt _readers; | AtomicInt _readers; |
AtomicInt _writers; | AtomicInt _writers; |
ReadWriteSemRep _rwlock; | ReadWriteSemRep _rwlock; |
friend void extricate_read_write(void *); |
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}; | }; |
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//============================================================================== | //============================================================================== |