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# SafeLibev.h

    00001 /*
    00002  *  Phusion Passenger - http://www.modrails.com/
    00003  *  Copyright (c) 2010 Phusion
    00004  *
    00005  *  "Phusion Passenger" is a trademark of Hongli Lai & Ninh Bui.
    00006  *
    00007  *  Permission is hereby granted, free of charge, to any person obtaining a copy
    00008  *  of this software and associated documentation files (the "Software"), to deal
    00009  *  in the Software without restriction, including without limitation the rights
    00010  *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    00011  *  copies of the Software, and to permit persons to whom the Software is
    00012  *  furnished to do so, subject to the following conditions:
    00013  *
    00014  *  The above copyright notice and this permission notice shall be included in
    00015  *  all copies or substantial portions of the Software.
    00016  *
    00017  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    00018  *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    00019  *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    00020  *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    00021  *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    00022  *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    00023  *  THE SOFTWARE.
    00024  */
    00025 #ifndef _PASSENGER_SAFE_LIBEV_H_
    00026 #define _PASSENGER_SAFE_LIBEV_H_
    00027
    00028 #include <ev++.h>
    00029 #include <vector>
    00030 #include <boost/thread.hpp>
    00031 #include <boost/function.hpp>
    00032 #include <boost/bind.hpp>
    00033
    00034 namespace Passenger {
    00035
    00036 using namespace std;
    00037 using namespace boost;
    00038
    00039
    00040 /**
    00041  * Class for thread-safely using libev.
    00042  */
    00043 class SafeLibev {
    00044 private:
    00045         typedef function<void ()> Callback;
    00046
    00047         struct ev_loop *loop;
    00048         pthread_t loopThread;
    00049         ev_async async;
    00050
    00051         boost::mutex syncher;
    00052         condition_variable cond;
    00053         vector<Callback> commands;
    00054
    00055         static void asyncHandler(EV_P_ ev_async *w, int revents) {
    00056                 SafeLibev *self = (SafeLibev *) w->data;
    00057                 unique_lock<boost::mutex> l(self->syncher);
    00058                 vector<Callback> commands = self->commands;
    00059                 self->commands.clear();
    00060                 l.unlock();
    00061
    00062                 vector<Callback>::const_iterator it, end = commands.end();
    00063                 for (it = commands.begin(); it != commands.end(); it++) {
    00064                         (*it)();
    00065                 }
    00066         }
    00067
    00068         template<typename Watcher>
    00069         void startWatcherAndNotify(Watcher *watcher, bool *done) {
    00070                 watcher->set(loop);
    00071                 watcher->start();
    00072                 unique_lock<boost::mutex> l(syncher);
    00073                 *done = true;
    00074                 cond.notify_all();
    00075         }
    00076
    00077         template<typename Watcher>
    00078         void stopWatcherAndNotify(Watcher *watcher, bool *done) {
    00079                 watcher->stop();
    00080                 unique_lock<boost::mutex> l(syncher);
    00081                 *done = true;
    00082                 cond.notify_all();
    00083         }
    00084
    00085 public:
    00086         SafeLibev(struct ev_loop *loop) {
    00087                 this->loop = loop;
    00088                 loopThread = pthread_self();
    00089                 ev_async_init(&async, asyncHandler);
    00090                 async.data = this;
    00091                 ev_async_start(loop, &async);
    00092         }
    00093
    00094         ~SafeLibev() {
    00095                 ev_async_stop(loop, &async);
    00096         }
    00097
    00098         struct ev_loop *getLoop() const {
    00099                 return loop;
    00100         }
    00101
    00102         template<typename Watcher>
    00103         void start(Watcher &watcher) {
    00104                 if (pthread_equal(pthread_self(), loopThread)) {
    00105                         watcher.set(loop);
    00106                         watcher.start();
    00107                 } else {
    00108                         unique_lock<boost::mutex> l(syncher);
    00109                         bool done = false;
    00110                         commands.push_back(boost::bind(&SafeLibev::startWatcherAndNotify<Watcher>,
    00111                                 this, &watcher, &done));
    00112                         ev_async_send(loop, &async);
    00113                         while (!done) {
    00114                                 cond.wait(l);
    00115                         }
    00116                 }
    00117         }
    00118
    00119         template<typename Watcher>
    00120         void stop(Watcher &watcher) {
    00121                 if (pthread_equal(pthread_self(), loopThread)) {
    00122                         watcher.stop();
    00123                 } else {
    00124                         unique_lock<boost::mutex> l(syncher);
    00125                         bool done = false;
    00126                         commands.push_back(boost::bind(&SafeLibev::stopWatcherAndNotify<Watcher>,
    00127                                 this, &watcher, &done));
    00128                         ev_async_send(loop, &async);
    00129                         while (!done) {
    00130                                 cond.wait(l);
    00131                         }
    00132                 }
    00133         }
    00134
    00135         void run(const Callback &callback) {
    00136                 if (pthread_equal(pthread_self(), loopThread)) {
    00137                         callback();
    00138                 } else {
    00139                         unique_lock<boost::mutex> l(syncher);
    00140                         commands.push_back(callback);
    00141                         ev_async_send(loop, &async);
    00142                 }
    00143         }
    00144 };
    00145
    00146
    00147 } // namespace Passenger
    00148
    00149 #endif /* _PASSENGER_SAFE_LIBEV_H_ */