git-svn-id: svn://db.shs.com.ru/pip@4 12ceb7fc-bf1f-11e4-8940-5bc7170c53b5
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339
src/thread/pithread.cpp
Executable file
339
src/thread/pithread.cpp
Executable file
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/*
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PIP - Platform Independent Primitives
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Thread
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Copyright (C) 2014 Ivan Pelipenko peri4ko@gmail.com
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "pithread.h"
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#include "pisystemtests.h"
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/*! \class PIThread
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* \brief Thread class
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* \details This class allow you exec your code in separate thread.
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*
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* \section PIThread_sec0 Synopsis
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* Multithreading allow you to write program which will be executed
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* in several threads simultaneously. This trend allow you to use all
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* cores of modern processors, but there are many dangers.
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*
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* This class provide virtual functions \a begin(), \a run() and \a end(),
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* which describes start, execution and finish work of some process.
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* These functions executes in \b separate thread. When you execute
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* \a start(), %PIThread create separate system thread and sequentially
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* executes function \a begin(), \a run() and \a end(). You can
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* reimplement each function and write your own code to execute.
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* Scheme of functions executing:
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\code{.cpp}
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begin();
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event started();
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while (isRunning()) {
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run();
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ThreadFunc();
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msleep(timer_delay);
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}
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event stopped();
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end();
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\endcode
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* Unlike from directly using "pthread" or some similar you doesn`t need
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* to write your own main thread cycle and sleep at every cycle end.
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* %PIThread make it for you, and your job is to set sleep value from
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* contructor or when starting thread, and reimplement \a begin(), \a run()
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* and \a end() functions.
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*
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* \section PIThread_sec1 Using without subclassing
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* You can use %PIThread without subclassing by using "ThreadFunc" pointer
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* that can be set from constructor or by overloaded function \a start(ThreadFunc func, int timer_delay).
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* If "func" if not null this function will be executed as \a run(). ThreadFunc is any static
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* function with format void func(void * data). "Data" is custom data set from constructor or
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* with function \a setData(). \n Also you can connect to event \a started(), but
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* in this case you should to white your thread main cycle, because this event raised only one time.
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*
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* \section PIThread_sec2 Locking
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* %PIThread has inrternal mutex that can be locked and unlocked every \a run() if you set this flag
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* with function \a needLockRun(bool). Also you can access to this mutex by functions \a lock(), \a unlock()
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* and \a mutex(). Using this functions together with needLockRun(true) can guarantee one-thread access to
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* some data.
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*
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*/
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PIThread::PIThread(void * data, ThreadFunc func, bool startNow, int timer_delay): PIObject() {
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piMonitor.threads++;
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thread = 0;
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data_ = data;
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ret_func = func;
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terminating = running_ = lockRun = false;
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priority_ = piNormal;
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delay_ = timer_delay;
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if (startNow) start(timer_delay);
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}
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PIThread::PIThread(bool startNow, int timer_delay): PIObject() {
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piMonitor.threads++;
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thread = 0;
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ret_func = 0;
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terminating = running_ = lockRun = false;
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priority_ = piNormal;
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delay_ = timer_delay;
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if (startNow) start(timer_delay);
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}
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PIThread::~PIThread() {
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piMonitor.threads--;
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if (!running_ || thread == 0) return;
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#ifndef WINDOWS
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# ifdef ANDROID
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pthread_kill(thread, SIGSTOP);
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# else
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pthread_cancel(thread);
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# endif
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#else
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TerminateThread(thread, 0);
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CloseHandle(thread);
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#endif
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terminating = running_ = false;
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}
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bool PIThread::start(int timer_delay) {
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if (running_) return false;
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terminating = running_ = false;
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delay_ = timer_delay;
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#ifndef WINDOWS
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pthread_attr_t attr;
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pthread_attr_init(&attr);
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pthread_attr_setschedparam(&attr, &sparam);
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if (pthread_create(&thread, &attr, thread_function, this) == 0) {
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setPriority(priority_);
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running_ = true;
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return true;
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#else
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thread = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)thread_function, this, 0, 0);
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if (thread != 0) {
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setPriority(priority_);
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running_ = true;
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return true;
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#endif
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} else {
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thread = 0;
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piCoutObj << "Error: Can`t start new thread:" << errorString();
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}
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return false;
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}
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bool PIThread::startOnce() {
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if (running_) return false;
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terminating = running_ = false;
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#ifndef WINDOWS
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pthread_attr_t attr;
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pthread_attr_init(&attr);
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pthread_attr_setschedparam(&attr, &sparam);
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if (pthread_create(&thread, &attr, thread_function_once, this) == 0) {
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setPriority(priority_);
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running_ = true;
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return true;
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#else
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thread = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)thread_function_once, this, 0, 0);
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if (thread != 0) {
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setPriority(priority_);
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running_ = true;
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return false;
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#endif
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} else {
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thread = 0;
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piCoutObj << "Error: Can`t start new thread:" << errorString();
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}
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return false;
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}
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void PIThread::terminate() {
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if (thread == 0) return;
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terminating = running_ = false;
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#ifndef WINDOWS
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# ifdef ANDROID
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pthread_kill(thread, SIGKILL);
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# else
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//pthread_kill(thread, SIGKILL);
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pthread_cancel(thread);
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# endif
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#else
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TerminateThread(thread, 0);
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CloseHandle(thread);
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#endif
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thread = 0;
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end();
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}
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void * PIThread::thread_function(void * t) {
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#ifndef WINDOWS
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# ifndef ANDROID
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pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, 0);
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pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, 0);
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# endif
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#else
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__PISetTimerResolution();
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#endif
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PIThread & ct = *((PIThread * )t);
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ct.running_ = true;
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if (ct.lockRun) ct.mutex_.lock();
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ct.begin();
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if (ct.lockRun) ct.mutex_.unlock();
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ct.started();
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while (!ct.terminating) {
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if (ct.lockRun) ct.mutex_.lock();
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ct.run();
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if (ct.ret_func != 0) ct.ret_func(ct.data_);
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if (ct.lockRun) ct.mutex_.unlock();
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if (ct.delay_ > 0) {
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ct.tmr_.reset();
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double sl(0.);
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while (1) {
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sl = piMind(ct.delay_ - ct.tmr_.elapsed_m(), 2.);
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if (sl <= 0.) break;
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piMSleep(sl);
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if (ct.terminating)
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break;
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}
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}
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}
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ct.stopped();
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if (ct.lockRun) ct.mutex_.lock();
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ct.end();
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if (ct.lockRun) ct.mutex_.unlock();
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ct.terminating = ct.running_ = false;
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//cout << "thread " << t << " exiting ... " << endl;
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#ifndef WINDOWS
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pthread_exit(0);
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#else
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ExitThread(0);
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#endif
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ct.thread = 0;
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return 0;
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}
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void * PIThread::thread_function_once(void * t) {
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#ifndef WINDOWS
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# ifndef ANDROID
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pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, 0);
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pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, 0);
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# endif
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#else
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__PISetTimerResolution();
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#endif
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PIThread & ct = *((PIThread * )t);
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ct.running_ = true;
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ct.begin();
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ct.started();
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if (ct.lockRun) ct.mutex_.lock();
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ct.run();
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if (ct.ret_func != 0) ct.ret_func(ct.data_);
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if (ct.lockRun) ct.mutex_.unlock();
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ct.stopped();
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ct.end();
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ct.terminating = ct.running_ = false;
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//cout << "thread " << t << " exiting ... " << endl;
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#ifndef WINDOWS
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pthread_exit(0);
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#else
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ExitThread(0);
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#endif
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ct.thread = 0;
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return 0;
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}
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int PIThread::priority2System(PIThread::Priority p) {
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switch (p) {
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# ifdef QNX
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case piLowerst: return 8;
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case piLow: return 9;
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case piNormal: return 10;
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case piHigh: return 11;
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case piHighest: return 12;
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# else
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# ifdef WINDOWS
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case piLowerst: return -2;
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case piLow: return -1;
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case piNormal: return 0;
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case piHigh: return 1;
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case piHighest: return 2;
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# else
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case piLowerst: return 2;
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case piLow: return 1;
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case piNormal: return 0;
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case piHigh: return -1;
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case piHighest: return -2;
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# endif
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# endif
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default: return 0;
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}
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return 0;
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}
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void PIThread::setPriority(PIThread::Priority prior) {
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priority_ = prior;
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#ifndef WINDOWS
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if (!running_ && thread != 0) return;
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pthread_getschedparam(thread, &policy_, &sparam);
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sparam.
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# ifndef LINUX
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sched_priority
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# else
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__sched_priority
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# endif
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= priority2System(priority_);
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pthread_setschedparam(thread, policy_, &sparam);
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#else
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if (!running_ && thread != 0) return;
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SetThreadPriority(thread, priority2System(priority_));
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#endif
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}
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bool PIThread::waitForFinish(int timeout_msecs) {
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if (!running_) return true;
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if (timeout_msecs < 0) {
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while (running_)
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msleep(1);
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return true;
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}
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tmf_.reset();
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while (running_ && tmf_.elapsed_m() < timeout_msecs)
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msleep(1);
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return tmf_.elapsed_m() < timeout_msecs;
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}
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bool PIThread::waitForStart(int timeout_msecs) {
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if (running_) return true;
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if (timeout_msecs < 0) {
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while (!running_)
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msleep(1);
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return true;
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}
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tms_.reset();
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while (!running_ && tms_.elapsed_m() < timeout_msecs)
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msleep(1);
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return tms_.elapsed_m() < timeout_msecs;
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}
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