| // 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 <cc++/buffer.h> |
| #include <cstdio> |
| |
| #ifdef CCXX_NAMESPACES |
| namespace ost { |
| #endif |
| |
| const size_t Buffer::timeout = ((size_t)(-1l)); |
| |
| #ifdef WIN32 |
| Buffer::Buffer(size_t capacity) : Mutex() |
| #else |
| Buffer::Buffer(size_t capacity) : Conditional() |
| #endif |
| { |
| #ifdef WIN32 |
| sem_head = ::CreateSemaphore((LPSECURITY_ATTRIBUTES)NULL, 0, MAX_SEM_VALUE, (LPCTSTR)NULL); |
| sem_tail = ::CreateSemaphore((LPSECURITY_ATTRIBUTES)NULL, (LONG)capacity, MAX_SEM_VALUE, (LPCTSTR)NULL); |
| #endif |
| _size = capacity; |
| _used = 0; |
| } |
| |
| Buffer::~Buffer() |
| { |
| #ifdef WIN32 |
| ::CloseHandle(sem_head); |
| ::CloseHandle(sem_tail); |
| #endif |
| } |
| |
| #ifdef WIN32 |
| |
| size_t Buffer::wait(void *buf, timeout_t timeout) |
| { |
| size_t rc; |
| |
| if(!timeout) |
| timeout = INFINITE; |
| if(Thread::waitThread(sem_head, timeout) != WAIT_OBJECT_0) |
| return Buffer::timeout; |
| enterMutex(); |
| rc = onWait(buf); |
| --_used; |
| leaveMutex(); |
| ::ReleaseSemaphore(sem_tail, 1, (LPLONG)NULL); |
| return rc; |
| } |
| |
| size_t Buffer::post(void *buf, timeout_t timeout) |
| { |
| size_t rc; |
| |
| if(!timeout) |
| timeout = INFINITE; |
| |
| if(Thread::waitThread(sem_tail, timeout) != WAIT_OBJECT_0) |
| return Buffer::timeout; |
| enterMutex(); |
| rc = onPost(buf); |
| ++_used; |
| leaveMutex(); |
| ::ReleaseSemaphore(sem_head, 1, (LPLONG)NULL); |
| return rc; |
| } |
| |
| #else |
| |
| size_t Buffer::wait(void *buf, timeout_t timeout) |
| { |
| size_t rc = 0; |
| enterMutex(); |
| while(!_used) { |
| if(!Conditional::wait(timeout, true)) { |
| leaveMutex(); |
| return Buffer::timeout; |
| } |
| } |
| rc = (ssize_t)onWait(buf); |
| --_used; |
| Conditional::signal(false); |
| leaveMutex(); |
| return rc; |
| } |
| |
| size_t Buffer::post(void *buf, timeout_t timeout) |
| { |
| size_t rc = 0; |
| |
| enterMutex(); |
| while(_used == _size) { |
| if(!Conditional::wait(timeout, true)) { |
| leaveMutex(); |
| return Buffer::timeout; |
| } |
| } |
| rc = (ssize_t)onPost(buf); |
| ++_used; |
| Conditional::signal(false); |
| leaveMutex(); |
| return rc; |
| } |
| |
| size_t Buffer::peek(void *buf) |
| { |
| size_t rc; |
| |
| enterMutex(); |
| if(!_used) { |
| leaveMutex(); |
| return 0; |
| } |
| rc = onPeek(buf); |
| leaveMutex(); |
| return rc; |
| } |
| |
| #endif |
| |
| bool Buffer::isValid(void) |
| { |
| return true; |
| } |
| |
| FixedBuffer::FixedBuffer(size_t capacity, size_t osize) : |
| Buffer(capacity) |
| { |
| objsize = osize; |
| buf = new char[capacity * objsize]; |
| |
| #ifdef CCXX_EXCEPTIONS |
| if(!buf && Thread::getException() == Thread::throwObject) |
| throw(this); |
| #ifdef COMMON_STD_EXCEPTION |
| else if(!buf && Thread::getException() == Thread::throwException) |
| throw(SyncException("fixed buffer failure")); |
| #endif |
| #endif |
| |
| head = tail = buf; |
| } |
| |
| FixedBuffer::~FixedBuffer() |
| { |
| if(buf) |
| delete[] buf; |
| } |
| |
| bool FixedBuffer::isValid(void) |
| { |
| if(head && tail) |
| return true; |
| |
| return false; |
| } |
| |
| #define MAXBUF (buf + (getSize() * objsize)) |
| |
| size_t FixedBuffer::onWait(void *data) |
| { |
| memcpy(data, head, objsize); |
| if((head += objsize) >= MAXBUF) |
| head = buf; |
| return objsize; |
| } |
| |
| size_t FixedBuffer::onPost(void *data) |
| { |
| memcpy(tail, data, objsize); |
| if((tail += objsize) >= MAXBUF) |
| tail = buf; |
| return objsize; |
| } |
| |
| size_t FixedBuffer::onPeek(void *data) |
| { |
| memcpy(data, head, objsize); |
| return objsize; |
| } |
| |
| ThreadQueue::ThreadQueue(const char *id, int pri, size_t stack) : |
| Mutex(), Thread(pri, stack), Semaphore(), name(id) |
| { |
| first = last = NULL; |
| started = false; |
| timeout = 0; |
| } |
| |
| ThreadQueue::~ThreadQueue() |
| { |
| data_t *data, *next; |
| if(started) { |
| started = false; |
| } |
| data = first; |
| while(data) { |
| next = data->next; |
| delete[] data; |
| data = next; |
| } |
| } |
| |
| void ThreadQueue::run(void) |
| { |
| bool posted; |
| data_t *prev; |
| started = true; |
| for(;;) { |
| posted = Semaphore::wait(timeout); |
| if(!posted) { |
| onTimer(); |
| if(!first) |
| continue; |
| } |
| if(!started) |
| sleep((timeout_t)~0); |
| startQueue(); |
| while(first) { |
| runQueue(first->data); |
| enterMutex(); |
| prev = first; |
| first = first->next; |
| delete[] prev; |
| if(!first) |
| last = NULL; |
| leaveMutex(); |
| if(first) |
| Semaphore::wait(); // demark semaphore |
| } |
| stopQueue(); |
| } |
| } |
| |
| void ThreadQueue::final() |
| { |
| #ifndef WIN32 |
| // Unlock is needed to unlock the mutex in the case of a cancel during Semaphore::wait() |
| // see PTHREAD_COND_TIMEDWAIT(3P) |
| Semaphore::force_unlock_after_cancellation(); |
| #endif |
| } |
| |
| void ThreadQueue::onTimer(void) |
| { |
| } |
| |
| void ThreadQueue::setTimer(timeout_t timed) |
| { |
| enterMutex(); |
| timeout = timed; |
| leaveMutex(); |
| if(!started) { |
| start(); |
| started = true; |
| } |
| else if(!first) |
| Semaphore::post(); |
| } |
| |
| void ThreadQueue::post(const void *dp, unsigned len) |
| { |
| data_t *data = (data_t *)new char[sizeof(data_t) + len]; |
| memcpy(data->data, dp, len); |
| data->len = len; |
| data->next = NULL; |
| enterMutex(); |
| if(!first) |
| first = data; |
| if(last) |
| last->next = data; |
| last = data; |
| if(!started) { |
| start(); |
| started = true; |
| } |
| leaveMutex(); |
| Semaphore::post(); |
| } |
| |
| void ThreadQueue::startQueue(void) |
| { |
| } |
| |
| void ThreadQueue::stopQueue(void) |
| { |
| } |
| |
| #ifdef CCXX_NAMESPACES |
| } |
| #endif |
| |
| /** EMACS ** |
| * Local variables: |
| * mode: c++ |
| * c-basic-offset: 4 |
| * End: |
| */ |