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version 1.1.2.6, 2006/07/28 21:19:53
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version 1.1.2.12, 2006/08/04 18:58:08
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| #include "ReadWriteSem.h" | #include "ReadWriteSem.h" |
| #include "Time.h" | #include "Time.h" |
| #include "PegasusAssert.h" | #include "PegasusAssert.h" |
| |
#include "Threads.h" |
| | |
| PEGASUS_NAMESPACE_BEGIN | PEGASUS_NAMESPACE_BEGIN |
| |
|
| //============================================================================== | //============================================================================== |
| // | // |
| // PEGASUS_USE_POSIX_RWLOCK | // PEGASUS_USE_POSIX_RWLOCK |
| // | // |
| //============================================================================== | //============================================================================== |
| |
|
| #ifdef PEGASUS_USE_POSIX_RWLOCK | #ifdef PEGASUS_USE_POSIX_RWLOCK |
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| ReadWriteSem::ReadWriteSem():_readers(0), _writers(0) | ReadWriteSem::ReadWriteSem():_readers(0), _writers(0) |
| { | { |
| pthread_rwlock_init(&_rwlock.rwlock, NULL); | pthread_rwlock_init(&_rwlock.rwlock, NULL); |
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| void ReadWriteSem::timed_wait(Uint32 mode, | void ReadWriteSem::timed_wait(Uint32 mode, |
| ThreadType caller, int milliseconds) | ThreadType caller, int milliseconds) |
| { | { |
| int errorcode = 0, timeout; |
int errorcode = 0, timeout = 0; |
| struct timeval now, finish, remaining; | struct timeval now, finish, remaining; |
| Uint32 usec; | Uint32 usec; |
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| int ReadWriteSem::read_count() const | int ReadWriteSem::read_count() const |
| { | { |
| #if defined(PEGASUS_PLATFORM_LINUX_GENERIC_GNU) |
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| PEGASUS_ASSERT(_readers.get() == _rwlock.rwlock.__rw_readers); |
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| #endif |
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| return (_readers.get()); | return (_readers.get()); |
| } | } |
| | |
| int ReadWriteSem::write_count() const | int ReadWriteSem::write_count() const |
| { | { |
| #if defined(PEGASUS_PLATFORM_LINUX_GENERIC_GNU) |
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| if (_rwlock.rwlock.__rw_writer != NULL) |
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| { |
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| PEGASUS_ASSERT(_writers.get() == 1); |
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| } |
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| #endif |
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| return (_writers.get()); | return (_writers.get()); |
| } | } |
| | |
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| // 2) I do not hold the write lock | // 2) I do not hold the write lock |
| // 3) I am not using a reader slot | // 3) I am not using a reader slot |
| | |
| |
#if 0 |
| void extricate_read_write(void *parm) | void extricate_read_write(void *parm) |
| { | { |
| ReadWriteSem *rws = (ReadWriteSem *) parm; | ReadWriteSem *rws = (ReadWriteSem *) parm; |
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| if (Threads::equal(rws->_rwlock._internal_lock.get_owner(), myself)) | if (Threads::equal(rws->_rwlock._internal_lock.get_owner(), myself)) |
| rws->_rwlock._internal_lock.unlock(); | rws->_rwlock._internal_lock.unlock(); |
| } | } |
| |
#endif |
| | |
| | |
| ReadWriteSem::ReadWriteSem():_readers(0), _writers(0), _rwlock() | ReadWriteSem::ReadWriteSem():_readers(0), _writers(0), _rwlock() |
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| // lock everyone out of this object | // lock everyone out of this object |
| try | try |
| { | { |
| _rwlock._internal_lock.lock(Threads::self()); |
_rwlock._internal_lock.lock(); |
| } | } |
| catch(Deadlock & d) |
catch(Deadlock &) |
| { | { |
| d = d; // no problem - we own the lock, which is |
// no problem - we own the lock, which is what we want |
| // what we want |
|
| } | } |
| catch(IPCException &) | catch(IPCException &) |
| { | { |
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| void ReadWriteSem::timed_wait(Uint32 mode, ThreadType caller, | void ReadWriteSem::timed_wait(Uint32 mode, ThreadType caller, |
| int milliseconds) | int milliseconds) |
| { | { |
| |
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| //----------------------------------------------------------------- | //----------------------------------------------------------------- |
| // Lock this object to maintain integrity while we decide | // Lock this object to maintain integrity while we decide |
| // exactly what to do next. | // exactly what to do next. |
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| | |
| // cleanup stack frame | // cleanup stack frame |
| { | { |
| |
// Threads::cleanup_push(extricate_read_write, this); |
| Threads::cleanup_push(extricate_read_write, this); |
|
| | |
| try | try |
| { | { |
| if (milliseconds == 0) | if (milliseconds == 0) |
| _rwlock._internal_lock.try_lock(Threads::self()); |
_rwlock._internal_lock.try_lock(); |
| else if (milliseconds == -1) | else if (milliseconds == -1) |
| _rwlock._internal_lock.lock(Threads::self()); |
_rwlock._internal_lock.lock(); |
| else | else |
| _rwlock._internal_lock.timed_lock(milliseconds, |
_rwlock._internal_lock.timed_lock(milliseconds); |
| Threads::self()); |
|
| } | } |
| catch(const IPCException & e) | catch(const IPCException & e) |
| { | { |
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|
| { | { |
| try | try |
| { | { |
| _rwlock._wlock.try_lock(Threads::self()); |
_rwlock._wlock.try_lock(); |
| } | } |
| catch(IPCException & e) | catch(IPCException & e) |
| { | { |
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|
| { | { |
| try | try |
| { | { |
| _rwlock._wlock.lock(Threads::self()); |
_rwlock._wlock.lock(); |
| } | } |
| catch(const IPCException & e) | catch(const IPCException & e) |
| { | { |
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|
| { | { |
| try | try |
| { | { |
| _rwlock._wlock.timed_lock(milliseconds, Threads::self()); |
_rwlock._wlock.timed_lock(milliseconds); |
| } | } |
| catch(const IPCException & e) | catch(const IPCException & e) |
| { | { |
Return to
ReadWriteSem.cpp
CVS log
Up to [Pegasus] / pegasus / src / Pegasus / Common