version 1.90.2.7, 2006/07/29 01:08:49
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version 1.90.2.9, 2006/07/29 15:54:07
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#if defined(PEGASUS_HAVE_PTHREADS) | #if defined(PEGASUS_HAVE_PTHREADS) |
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struct StartWrapperArg |
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{ |
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void *(PEGASUS_THREAD_CDECL * start) (void *); |
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void *arg; |
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}; |
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extern "C" void *_start_wrapper(void *arg_) | extern "C" void *_start_wrapper(void *arg_) |
{ | { |
StartWrapperArg *arg = (StartWrapperArg *) arg_; | StartWrapperArg *arg = (StartWrapperArg *) arg_; |
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return return_value; | return return_value; |
} | } |
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void Thread::cancel() |
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{ |
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_cancelled = true; |
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pthread_cancel(_handle.thid.tt_handle()); |
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} |
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void Thread::test_cancel() |
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{ |
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#if defined(PEGASUS_PLATFORM_ZOS_ZSERIES_IBM) |
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pthread_testintr(); |
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#else |
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pthread_testcancel(); |
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#endif |
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} |
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Boolean Thread::is_cancelled(void) |
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{ |
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return _cancelled; |
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} |
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void Thread::thread_switch() |
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{ |
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#if defined(PEGASUS_PLATFORM_ZOS_ZSERIES_IBM) |
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pthread_yield(NULL); |
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#else |
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sched_yield(); |
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#endif |
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} |
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/* |
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ATTN: why are these missing on other platforms? |
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*/ |
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#if defined(PEGASUS_PLATFORM_LINUX_GENERIC_GNU) |
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void Thread::suspend() |
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{ |
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pthread_kill(_handle.thid.tt_handle(), SIGSTOP); |
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} |
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void Thread::resume() |
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{ |
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pthread_kill(_handle.thid.tt_handle(), SIGCONT); |
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} |
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#endif |
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void Thread::sleep(Uint32 msec) |
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{ |
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Threads::sleep(msec); |
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} |
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void Thread::join(void) |
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{ |
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if (!_is_detached && Threads::id(_handle.thid) != 0) |
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pthread_join(_handle.thid.tt_handle(), &_exit_code); |
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Threads::clear(_handle.thid); |
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} |
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void Thread::thread_init(void) |
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{ |
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#if defined(PEGASUS_PLATFORM_ZOS_ZSERIES_IBM) |
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pthread_setintr(PTHREAD_INTR_ENABLE); |
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pthread_setintrtype(PTHREAD_INTR_ASYNCHRONOUS); |
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#else |
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pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL); |
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pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL); |
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#endif |
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_cancel_enabled = true; |
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} |
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void Thread::detach(void) |
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{ |
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_is_detached = true; |
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pthread_detach(_handle.thid.tt_handle()); |
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} |
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ThreadStatus Thread::run() |
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{ |
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StartWrapperArg *arg = new StartWrapperArg; |
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arg->start = _start; |
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arg->arg = this; |
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Threads::Type type = _is_detached ? Threads::DETACHED : Threads::JOINABLE; |
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int rc = Threads::create(_handle.thid, type, _start_wrapper, arg); |
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// On Linux distributions released prior 2005, the implementation of |
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// Native POSIX Thread Library returns ENOMEM instead of EAGAIN when |
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// there |
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// are no insufficient memory. Hence we are checking for both. See bug |
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// 386. |
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if ((rc == EAGAIN) || (rc == ENOMEM)) |
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{ |
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Threads::clear(_handle.thid); |
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delete arg; |
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return PEGASUS_THREAD_INSUFFICIENT_RESOURCES; |
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} |
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else if (rc != 0) |
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{ |
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Threads::clear(_handle.thid); |
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delete arg; |
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return PEGASUS_THREAD_SETUP_FAILURE; |
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} |
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return PEGASUS_THREAD_OK; |
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} |
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static sigset_t *block_signal_mask(sigset_t * sig) | static sigset_t *block_signal_mask(sigset_t * sig) |
{ | { |
sigemptyset(sig); | sigemptyset(sig); |
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#if defined(PEGASUS_HAVE_WINDOWS_THREADS) | #if defined(PEGASUS_HAVE_WINDOWS_THREADS) |
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ThreadStatus Thread::run(void) |
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{ |
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// Note: A Win32 thread ID is not the same thing as a pthread ID. |
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// Win32 threads have both a thread ID and a handle. The handle |
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// is used in the wait functions, etc. |
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// So _handle.thid is actually the thread handle. |
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unsigned threadid = 0; |
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ThreadType tt; |
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tt.handle = (HANDLE) _beginthreadex(NULL, 0, _start, this, 0, &threadid); |
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_handle.thid = tt; |
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if (Threads::id(_handle.thid) == 0) |
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{ |
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if (errno == EAGAIN) |
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{ |
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return PEGASUS_THREAD_INSUFFICIENT_RESOURCES; |
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} |
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else |
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{ |
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return PEGASUS_THREAD_SETUP_FAILURE; |
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} |
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} |
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return PEGASUS_THREAD_OK; |
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} |
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void Thread::cancel(void) |
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{ |
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_cancelled = true; |
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} |
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void Thread::test_cancel(void) |
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{ |
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if (_cancel_enabled && _cancelled) |
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{ |
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exit_self(0); |
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} |
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} |
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Boolean Thread::is_cancelled(void) |
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{ |
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return _cancelled; |
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} |
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void Thread::thread_switch(void) |
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{ |
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Sleep(0); |
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} |
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void Thread::sleep(Uint32 milliseconds) |
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{ |
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Sleep(milliseconds); |
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} |
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void Thread::join(void) |
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{ |
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if (Threads::id(_handle.thid) != 0) |
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{ |
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if (!_is_detached) |
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{ |
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if (!_cancelled) |
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{ |
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// Emulate the unix join api. Caller sleeps until thread is |
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// done. |
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WaitForSingleObject(_handle.thid.handle, INFINITE); |
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} |
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else |
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{ |
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// Currently this is the only way to ensure this code does |
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// not |
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// hang forever. |
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if (WaitForSingleObject(_handle.thid.handle, 10000) == |
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WAIT_TIMEOUT) |
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{ |
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TerminateThread(_handle.thid.handle, 0); |
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} |
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} |
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DWORD exit_code = 0; |
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GetExitCodeThread(_handle.thid.handle, &exit_code); |
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_exit_code = (ThreadReturnType) exit_code; |
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} |
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CloseHandle(_handle.thid.handle); |
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Threads::clear(_handle.thid); |
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} |
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} |
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void Thread::thread_init(void) |
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{ |
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_cancel_enabled = true; |
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} |
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void Thread::detach(void) |
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{ |
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_is_detached = true; |
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} |
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Thread::Thread(ThreadReturnType(PEGASUS_THREAD_CDECL * start) (void *), | Thread::Thread(ThreadReturnType(PEGASUS_THREAD_CDECL * start) (void *), |
void *parameter, | void *parameter, |
Boolean detached):_is_detached(detached), | Boolean detached):_is_detached(detached), |
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PEG_METHOD_EXIT(); | PEG_METHOD_EXIT(); |
} | } |
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/////////////////////////////////////////////////////////////////////////////// |
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// |
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// ThreadPool |
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// |
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/////////////////////////////////////////////////////////////////////////////// |
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ThreadPool::ThreadPool(Sint16 initialSize, |
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const char *key, |
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Sint16 minThreads, |
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Sint16 maxThreads, |
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struct timeval |
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&deallocateWait):_maxThreads(maxThreads), |
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_minThreads(minThreads), _currentThreads(0), _idleThreads(), |
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_runningThreads(), _dying(0) |
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{ |
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_deallocateWait.tv_sec = deallocateWait.tv_sec; |
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_deallocateWait.tv_usec = deallocateWait.tv_usec; |
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memset(_key, 0x00, 17); |
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if (key != 0) |
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{ |
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strncpy(_key, key, 16); |
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} |
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if ((_maxThreads > 0) && (_maxThreads < initialSize)) |
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{ |
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_maxThreads = initialSize; |
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} |
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if (_minThreads > initialSize) |
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{ |
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_minThreads = initialSize; |
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} |
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for (int i = 0; i < initialSize; i++) |
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{ |
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_addToIdleThreadsQueue(_initializeThread()); |
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} |
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} |
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ThreadPool::~ThreadPool() |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::~ThreadPool"); |
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try |
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{ |
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// Set the dying flag so all thread know the destructor has been |
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// entered |
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_dying++; |
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Tracer::trace(TRC_THREAD, Tracer::LEVEL2, |
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"Cleaning up %d idle threads. ", _currentThreads.get()); |
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while (_currentThreads.get() > 0) |
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{ |
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Thread *thread = _idleThreads.remove_front(); |
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if (thread != 0) |
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{ |
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_cleanupThread(thread); |
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_currentThreads--; |
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} |
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else |
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{ |
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Threads::yield(); |
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} |
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} |
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} |
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catch(...) |
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{ |
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} |
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} |
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ThreadReturnType PEGASUS_THREAD_CDECL ThreadPool::_loop(void *parm) |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::_loop"); |
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try |
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{ |
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Thread *myself = (Thread *) parm; |
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PEGASUS_ASSERT(myself != 0); |
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// Set myself into thread specific storage |
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// This will allow code to get its own Thread |
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Thread::setCurrent(myself); |
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ThreadPool *pool = (ThreadPool *) myself->get_parm(); |
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PEGASUS_ASSERT(pool != 0); |
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Semaphore *sleep_sem = 0; |
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struct timeval *lastActivityTime = 0; |
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try |
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{ |
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sleep_sem = (Semaphore *) myself->reference_tsd("sleep sem"); |
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myself->dereference_tsd(); |
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PEGASUS_ASSERT(sleep_sem != 0); |
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lastActivityTime = |
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(struct timeval *) myself-> |
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reference_tsd("last activity time"); |
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myself->dereference_tsd(); |
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PEGASUS_ASSERT(lastActivityTime != 0); |
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} |
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catch(...) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: Failure getting sleep_sem or " |
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"lastActivityTime."); |
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PEGASUS_ASSERT(false); |
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pool->_idleThreads.remove(myself); |
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pool->_currentThreads--; |
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PEG_METHOD_EXIT(); |
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return ((ThreadReturnType) 1); |
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} |
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while (1) |
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{ |
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try |
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{ |
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sleep_sem->wait(); |
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} |
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catch(...) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: failure on sleep_sem->wait()."); |
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PEGASUS_ASSERT(false); |
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pool->_idleThreads.remove(myself); |
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pool->_currentThreads--; |
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PEG_METHOD_EXIT(); |
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return ((ThreadReturnType) 1); |
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} |
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// When we awaken we reside on the _runningThreads queue, not the |
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// _idleThreads queue. |
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ThreadReturnType(PEGASUS_THREAD_CDECL * work) (void *) = 0; |
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void *parm = 0; |
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Semaphore *blocking_sem = 0; |
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try |
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{ |
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work = (ThreadReturnType(PEGASUS_THREAD_CDECL *) (void *)) |
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myself->reference_tsd("work func"); |
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myself->dereference_tsd(); |
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parm = myself->reference_tsd("work parm"); |
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myself->dereference_tsd(); |
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blocking_sem = |
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(Semaphore *) myself->reference_tsd("blocking sem"); |
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myself->dereference_tsd(); |
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} |
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catch(...) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: Failure accessing work func, work parm, " |
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"or blocking sem."); |
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PEGASUS_ASSERT(false); |
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pool->_idleThreads.remove(myself); |
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pool->_currentThreads--; |
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PEG_METHOD_EXIT(); |
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return ((ThreadReturnType) 1); |
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} |
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if (work == 0) |
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{ |
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Tracer::trace(TRC_THREAD, Tracer::LEVEL4, |
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"ThreadPool::_loop: work func is 0, meaning we should exit."); |
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break; |
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} |
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Time::gettimeofday(lastActivityTime); |
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try |
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{ |
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PEG_TRACE_STRING(TRC_THREAD, Tracer::LEVEL4, |
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"Work starting."); |
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work(parm); |
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PEG_TRACE_STRING(TRC_THREAD, Tracer::LEVEL4, |
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"Work finished."); |
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} |
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catch(Exception & e) |
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{ |
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PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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String |
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("Exception from work in ThreadPool::_loop: ") |
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+ e.getMessage()); |
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} |
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#if !defined(PEGASUS_OS_LSB) |
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catch(const exception & e) |
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{ |
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PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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String |
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("Exception from work in ThreadPool::_loop: ") |
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+ e.what()); |
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} |
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#endif |
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catch(...) |
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{ |
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PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"Unknown exception from work in ThreadPool::_loop."); |
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} |
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// put myself back onto the available list |
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try |
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{ |
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Time::gettimeofday(lastActivityTime); |
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if (blocking_sem != 0) |
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{ |
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blocking_sem->signal(); |
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} |
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pool->_runningThreads.remove(myself); |
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pool->_idleThreads.insert_front(myself); |
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} |
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catch(...) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::_loop: Adding thread to idle pool failed."); |
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PEGASUS_ASSERT(false); |
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pool->_currentThreads--; |
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PEG_METHOD_EXIT(); |
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return ((ThreadReturnType) 1); |
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} |
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} |
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} |
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catch(const Exception & e) |
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{ |
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PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"Caught exception: \"" + e.getMessage() + |
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"\". Exiting _loop."); |
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} |
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catch(...) |
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{ |
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PEG_TRACE_STRING(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"Caught unrecognized exception. Exiting _loop."); |
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} |
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PEG_METHOD_EXIT(); |
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return ((ThreadReturnType) 0); |
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} |
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ThreadStatus ThreadPool::allocate_and_awaken(void *parm, |
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ThreadReturnType |
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(PEGASUS_THREAD_CDECL * |
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work) (void *), |
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Semaphore * blocking) |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::allocate_and_awaken"); |
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// Allocate_and_awaken will not run if the _dying flag is set. |
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// Once the lock is acquired, ~ThreadPool will not change |
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// the value of _dying until the lock is released. |
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try |
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{ |
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if (_dying.get()) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::allocate_and_awaken: ThreadPool is dying(1)."); |
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return PEGASUS_THREAD_UNAVAILABLE; |
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} |
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struct timeval start; |
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Time::gettimeofday(&start); |
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Thread *th = 0; |
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th = _idleThreads.remove_front(); |
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if (th == 0) |
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{ |
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if ((_maxThreads == 0) || |
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(_currentThreads.get() < Uint32(_maxThreads))) |
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{ |
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th = _initializeThread(); |
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} |
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} |
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if (th == 0) |
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{ |
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// ATTN-DME-P3-20031103: This trace message should not be |
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// be labeled TRC_DISCARDED_DATA, because it does not |
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// necessarily imply that a failure has occurred. However, |
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// this label is being used temporarily to help isolate |
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// the cause of client timeout problems. |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::allocate_and_awaken: Insufficient resources: " |
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" pool = %s, running threads = %d, idle threads = %d", |
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_key, _runningThreads.size(), _idleThreads.size()); |
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return PEGASUS_THREAD_INSUFFICIENT_RESOURCES; |
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} |
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// initialize the thread data with the work function and parameters |
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Tracer::trace(TRC_THREAD, Tracer::LEVEL4, |
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"Initializing thread with work function and parameters: parm = %p", |
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parm); |
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th->delete_tsd("work func"); |
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th->put_tsd("work func", NULL, |
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sizeof (ThreadReturnType(PEGASUS_THREAD_CDECL *) |
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(void *)), (void *) work); |
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th->delete_tsd("work parm"); |
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th->put_tsd("work parm", NULL, sizeof (void *), parm); |
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th->delete_tsd("blocking sem"); |
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if (blocking != 0) |
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th->put_tsd("blocking sem", NULL, sizeof (Semaphore *), blocking); |
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// put the thread on the running list |
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_runningThreads.insert_front(th); |
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// signal the thread's sleep semaphore to awaken it |
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Semaphore *sleep_sem = (Semaphore *) th->reference_tsd("sleep sem"); |
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PEGASUS_ASSERT(sleep_sem != 0); |
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Tracer::trace(TRC_THREAD, Tracer::LEVEL4, "Signal thread to awaken"); |
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sleep_sem->signal(); |
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th->dereference_tsd(); |
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} |
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catch(...) |
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{ |
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Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
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"ThreadPool::allocate_and_awaken: Operation Failed."); |
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PEG_METHOD_EXIT(); |
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// ATTN: Error result has not yet been defined |
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return PEGASUS_THREAD_SETUP_FAILURE; |
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} |
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PEG_METHOD_EXIT(); |
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return PEGASUS_THREAD_OK; |
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} |
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// caller is responsible for only calling this routine during slack periods |
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// but should call it at least once per _deallocateWait interval. |
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Uint32 ThreadPool::cleanupIdleThreads() |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::cleanupIdleThreads"); |
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Uint32 numThreadsCleanedUp = 0; |
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Uint32 numIdleThreads = _idleThreads.size(); |
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for (Uint32 i = 0; i < numIdleThreads; i++) |
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{ |
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// Do not dip below the minimum thread count |
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if (_currentThreads.get() <= (Uint32) _minThreads) |
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{ |
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break; |
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} |
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Thread *thread = _idleThreads.remove_back(); |
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// If there are no more threads in the _idleThreads queue, we're |
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// done. |
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if (thread == 0) |
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{ |
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break; |
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} |
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struct timeval *lastActivityTime; |
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try |
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{ |
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lastActivityTime = |
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(struct timeval *) thread-> |
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try_reference_tsd("last activity time"); |
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PEGASUS_ASSERT(lastActivityTime != 0); |
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} |
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catch(...) |
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{ |
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PEGASUS_ASSERT(false); |
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_idleThreads.insert_back(thread); |
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break; |
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} |
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Boolean cleanupThisThread = |
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_timeIntervalExpired(lastActivityTime, &_deallocateWait); |
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thread->dereference_tsd(); |
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if (cleanupThisThread) |
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{ |
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_cleanupThread(thread); |
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_currentThreads--; |
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numThreadsCleanedUp++; |
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} |
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else |
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{ |
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_idleThreads.insert_front(thread); |
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} |
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} |
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PEG_METHOD_EXIT(); |
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return numThreadsCleanedUp; |
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} |
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void ThreadPool::_cleanupThread(Thread * thread) |
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{ |
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PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::cleanupThread"); |
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// Set the "work func" and "work parm" to 0 so _loop() knows to exit. |
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thread->delete_tsd("work func"); |
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thread->put_tsd("work func", 0, |
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sizeof (ThreadReturnType(PEGASUS_THREAD_CDECL *) |
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(void *)), (void *) 0); |
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thread->delete_tsd("work parm"); |
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thread->put_tsd("work parm", 0, sizeof (void *), 0); |
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// signal the thread's sleep semaphore to awaken it |
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Semaphore *sleep_sem = (Semaphore *) thread->reference_tsd("sleep sem"); |
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PEGASUS_ASSERT(sleep_sem != 0); |
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sleep_sem->signal(); |
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thread->dereference_tsd(); |
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thread->join(); |
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delete thread; |
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PEG_METHOD_EXIT(); |
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} |
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|
|
Boolean ThreadPool::_timeIntervalExpired(struct timeval *start, |
|
struct timeval *interval) |
|
{ |
|
// never time out if the interval is zero |
|
if (interval && (interval->tv_sec == 0) && (interval->tv_usec == 0)) |
|
{ |
|
return false; |
|
} |
|
|
|
struct timeval now, finish, remaining; |
|
Uint32 usec; |
|
Time::gettimeofday(&now); |
|
Time::gettimeofday(&remaining); // Avoid valgrind error |
|
|
|
finish.tv_sec = start->tv_sec + interval->tv_sec; |
|
usec = start->tv_usec + interval->tv_usec; |
|
finish.tv_sec += (usec / 1000000); |
|
usec %= 1000000; |
|
finish.tv_usec = usec; |
|
|
|
return (Time::subtract(&remaining, &finish, &now) != 0); |
|
} |
|
|
|
void ThreadPool::_deleteSemaphore(void *p) |
|
{ |
|
delete(Semaphore *) p; |
|
} |
|
|
|
Thread *ThreadPool::_initializeThread() |
|
{ |
|
PEG_METHOD_ENTER(TRC_THREAD, "ThreadPool::_initializeThread"); |
|
|
|
Thread *th = (Thread *) new Thread(_loop, this, false); |
|
|
|
// allocate a sleep semaphore and pass it in the thread context |
|
// initial count is zero, loop function will sleep until |
|
// we signal the semaphore |
|
Semaphore *sleep_sem = (Semaphore *) new Semaphore(0); |
|
th->put_tsd("sleep sem", &_deleteSemaphore, sizeof (Semaphore), |
|
(void *) sleep_sem); |
|
|
|
struct timeval *lastActivityTime = |
|
(struct timeval *)::operator new(sizeof (struct timeval)); |
|
Time::gettimeofday(lastActivityTime); |
|
|
|
th->put_tsd("last activity time", thread_data::default_delete, |
|
sizeof (struct timeval), (void *) lastActivityTime); |
|
// thread will enter _loop() and sleep on sleep_sem until we signal it |
|
|
|
if (th->run() != PEGASUS_THREAD_OK) |
|
{ |
|
Tracer::trace(TRC_THREAD, Tracer::LEVEL2, |
|
"Could not create thread. Error code is %d.", errno); |
|
delete th; |
|
return 0; |
|
} |
|
_currentThreads++; |
|
Threads::yield(); |
|
|
|
PEG_METHOD_EXIT(); |
|
return th; |
|
} |
|
|
|
void ThreadPool::_addToIdleThreadsQueue(Thread * th) |
|
{ |
|
if (th == 0) |
|
{ |
|
Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
|
"ThreadPool::_addToIdleThreadsQueue: Thread pointer is null."); |
|
throw NullPointer(); |
|
} |
|
|
|
try |
|
{ |
|
_idleThreads.insert_front(th); |
|
} |
|
catch(...) |
|
{ |
|
Tracer::trace(TRC_DISCARDED_DATA, Tracer::LEVEL2, |
|
"ThreadPool::_addToIdleThreadsQueue: _idleThreads.insert_front " |
|
"failed."); |
|
} |
|
} |
|
|
|
// ATTN: not sure where to put this! | // ATTN: not sure where to put this! |
#ifdef PEGASUS_ZOS_SECURITY | #ifdef PEGASUS_ZOS_SECURITY |
bool isEnhancedSecurity = 99; | bool isEnhancedSecurity = 99; |