mirror of https://gitee.com/bigwinds/arangodb
129 lines
3.2 KiB
C++
129 lines
3.2 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief tasks used to handle signals
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2004-2012 triagens GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is triAGENS GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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/// @author Achim Brandt
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/// @author Copyright 2008-2012, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "SignalTask.h"
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#include "Logger/Logger.h"
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#include "Basics/MutexLocker.h"
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#include "Scheduler/Scheduler.h"
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using namespace triagens::basics;
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using namespace triagens::rest;
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// -----------------------------------------------------------------------------
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// constructors and destructors
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// -----------------------------------------------------------------------------
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SignalTask::SignalTask ()
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: Task("SignalTask") {
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for (size_t i = 0; i < MAX_SIGNALS; ++i) {
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watcher[i] = 0;
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}
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}
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SignalTask::~SignalTask () {
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}
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// -----------------------------------------------------------------------------
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// public methods
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// -----------------------------------------------------------------------------
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bool SignalTask::addSignal (int signal) {
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MUTEX_LOCKER(changeLock);
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if (signals.size() >= MAX_SIGNALS) {
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LOGGER_ERROR << "maximal number of signals reached";
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return false;
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}
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else {
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if (scheduler != 0) {
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scheduler->unregisterTask(this);
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}
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signals.insert(signal);
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if (scheduler != 0) {
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scheduler->registerTask(this);
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}
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return true;
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}
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}
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// -----------------------------------------------------------------------------
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// Task methods
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// -----------------------------------------------------------------------------
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bool SignalTask::setup (Scheduler* scheduler, EventLoop loop) {
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this->scheduler = scheduler;
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this->loop = loop;
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size_t pos = 0;
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for (set<int>::iterator i = signals.begin(); i != signals.end() && pos < MAX_SIGNALS; ++i, ++pos) {
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watcher[pos] = scheduler->installSignalEvent(loop, this, *i);
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}
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return true;
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}
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void SignalTask::cleanup () {
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for (size_t pos = 0; pos < signals.size() && pos < MAX_SIGNALS; ++pos) {
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scheduler->uninstallEvent(watcher[pos]);
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watcher[pos] = 0;
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}
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}
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bool SignalTask::handleEvent (EventToken token, EventType revents) {
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bool result = true;
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if (revents & EVENT_SIGNAL) {
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for (size_t pos = 0; pos < signals.size() && pos < MAX_SIGNALS; ++pos) {
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if (token == watcher[pos]) {
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result = handleSignal();
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break;
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}
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}
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}
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return result;
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}
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bool SignalTask::needsMainEventLoop () const {
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return true;
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}
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