diff options
Diffstat (limited to 'cpp/src/qpid/posix/EventChannelThreads.h')
-rw-r--r-- | cpp/src/qpid/posix/EventChannelThreads.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/cpp/src/qpid/posix/EventChannelThreads.h b/cpp/src/qpid/posix/EventChannelThreads.h new file mode 100644 index 0000000000..ae172ae752 --- /dev/null +++ b/cpp/src/qpid/posix/EventChannelThreads.h @@ -0,0 +1,92 @@ +#ifndef _posix_EventChannelThreads_h +#define _sys_EventChannelThreads_h + +/* + * + * Copyright (c) 2006 The Apache Software Foundation + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ +#include <vector> + +#include <qpid/Exception.h> +#include <qpid/sys/Time.h> +#include <qpid/sys/Monitor.h> +#include <qpid/sys/Thread.h> +#include <qpid/sys/AtomicCount.h> +#include "EventChannel.h" + +namespace qpid { +namespace sys { + +/** + Dynamic thread pool serving an EventChannel. + + Threads run a loop { e = getEvent(); e->dispatch(); } + The size of the thread pool is automatically adjusted to optimal size. +*/ +class EventChannelThreads : + public qpid::SharedObject<EventChannelThreads>, + public sys::Monitor, private sys::Runnable +{ + public: + /** Create the thread pool and start initial threads. */ + static EventChannelThreads::shared_ptr create( + EventChannel::shared_ptr channel + ); + + ~EventChannelThreads(); + + /** Post event to the underlying channel */ + void postEvent(Event& event) { channel->postEvent(event); } + + /** Post event to the underlying channel Must not be 0. */ + void postEvent(Event* event) { channel->postEvent(event); } + + /** + * Terminate all threads. + * + * Returns immediately, use join() to wait till all threads are + * shut down. + */ + void shutdown(); + + /** Wait for all threads to terminate. */ + void join(); + + private: + typedef std::vector<sys::Thread> Threads; + typedef enum { + RUNNING, TERMINATE_SENT, JOINING, SHUTDOWN + } State; + + EventChannelThreads(EventChannel::shared_ptr underlyingChannel); + void addThread(); + + void run(); + bool keepRunning(); + void adjustThreads(); + + EventChannel::shared_ptr channel; + Threads workers; + sys::AtomicCount nWaiting; + State state; + Event terminate; +}; + + +}} + + +#endif /*!_sys_EventChannelThreads_h*/ |