| // Copyright (C) 1999-2005 Open Source Telecom Corporation. |
| // Copyright (C) 2006-2010 David Sugar, Tycho Softworks. |
| // |
| // This program is free software; you can redistribute it and/or modify |
| // it under the terms of the GNU General Public License as published by |
| // the Free Software Foundation; either version 2 of the License, or |
| // (at your option) any later version. |
| // |
| // This program is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| // |
| // You should have received a copy of the GNU General Public License |
| // along with this program; if not, write to the Free Software |
| // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| // |
| // As a special exception, you may use this file as part of a free software |
| // library without restriction. Specifically, if other files instantiate |
| // templates or use macros or inline functions from this file, or you compile |
| // this file and link it with other files to produce an executable, this |
| // file does not by itself cause the resulting executable to be covered by |
| // the GNU General Public License. This exception does not however |
| // invalidate any other reasons why the executable file might be covered by |
| // the GNU General Public License. |
| // |
| // This exception applies only to the code released under the name GNU |
| // Common C++. If you copy code from other releases into a copy of GNU |
| // Common C++, as the General Public License permits, the exception does |
| // not apply to the code that you add in this way. To avoid misleading |
| // anyone as to the status of such modified files, you must delete |
| // this exception notice from them. |
| // |
| // If you write modifications of your own for GNU Common C++, it is your choice |
| // whether to permit this exception to apply to your modifications. |
| // If you do not wish that, delete this exception notice. |
| // |
| |
| #include <cc++/config.h> |
| #include <cc++/export.h> |
| #include <cc++/exception.h> |
| #include <cc++/thread.h> |
| #include "private.h" |
| #include <cstdio> |
| #include <cstdlib> |
| |
| #ifdef CCXX_NAMESPACES |
| namespace ost { |
| #endif |
| |
| #ifndef WIN32 |
| |
| extern "C" { |
| #include <sys/types.h> |
| } |
| |
| #include <cerrno> |
| |
| Semaphore::Semaphore(unsigned resource) |
| { |
| pthread_mutexattr_t attr; |
| pthread_mutexattr_init(&attr); |
| pthread_mutex_init(&_mutex, &attr); |
| pthread_mutexattr_destroy(&attr); |
| if(pthread_cond_init(&_cond, NULL) && Thread::getException() == Thread::throwObject) |
| THROW(this); |
| |
| _count = resource; |
| _waiters = 0; |
| } |
| |
| Semaphore::~Semaphore() |
| { |
| // Unlock is needed to unlock the mutex in the case of a cancel during Semaphore::wait() |
| // see PTHREAD_COND_TIMEDWAIT(3P) |
| pthread_mutex_unlock(&_mutex); |
| pthread_cond_destroy(&_cond); |
| pthread_mutex_destroy(&_mutex); |
| } |
| |
| void Semaphore::force_unlock_after_cancellation() |
| { |
| pthread_mutex_unlock(&_mutex); |
| } |
| |
| bool Semaphore::wait(timeout_t timeout) |
| { |
| struct timespec ts; |
| bool flag = true; |
| int rc; |
| pthread_mutex_lock(&_mutex); |
| ++_waiters; |
| |
| if(_count) |
| goto exiting; |
| |
| if(!timeout) { |
| while(_count == 0) |
| pthread_cond_wait(&_cond, &_mutex); |
| goto exiting; |
| } |
| |
| getTimeout(&ts, timeout); |
| rc = pthread_cond_timedwait(&_cond, &_mutex, &ts); |
| if(rc == ETIMEDOUT || _count == 0) |
| flag = false; |
| |
| exiting: |
| --_waiters; |
| if(_count) |
| --_count; |
| pthread_mutex_unlock(&_mutex); |
| return flag; |
| } |
| |
| void Semaphore::post(void) |
| { |
| pthread_mutex_lock(&_mutex); |
| if(_waiters > 0) |
| pthread_cond_signal(&_cond); |
| ++_count; |
| pthread_mutex_unlock(&_mutex); |
| } |
| |
| #if 0 // stripped since only in posix |
| int Semaphore::getValue(void) |
| { |
| int value; |
| |
| pthread_mutex_lock(&_mutex); |
| value = _count; |
| pthread_mutex_unlock(&_mutex); |
| return value; |
| } |
| #endif |
| |
| #else |
| |
| Semaphore::Semaphore(unsigned resource) |
| { |
| semObject = ::CreateSemaphore((LPSECURITY_ATTRIBUTES)NULL, (LONG)resource, MAX_SEM_VALUE, (LPCTSTR)NULL); |
| } |
| |
| Semaphore::~Semaphore() |
| { |
| ::CloseHandle(semObject); |
| } |
| |
| bool Semaphore::wait(timeout_t timeout) |
| { |
| if(!timeout) |
| timeout = INFINITE; |
| |
| return Thread::waitThread(semObject, timeout) == WAIT_OBJECT_0; |
| } |
| |
| void Semaphore::post(void) |
| { |
| ::ReleaseSemaphore(semObject, 1, (LPLONG)NULL); |
| } |
| |
| |
| #endif //WIN32 |
| |
| #ifdef CCXX_NAMESPACES |
| } |
| #endif |
| |
| /** EMACS ** |
| * Local variables: |
| * mode: c++ |
| * c-basic-offset: 4 |
| * End: |
| */ |