ba1d7a6cec
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56227 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: msgqueue.h
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// Purpose: interface of wxMessageQueue<T>
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// Author: wxWidgets team
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// RCS-ID: $Id$
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// Licence: wxWindows license
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/////////////////////////////////////////////////////////////////////////////
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/**
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wxMessageQueue allows passing messages between threads.
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This class should be typically used to communicate between the main and worker
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threads. The main thread calls wxMessageQueue::Post and the worker thread
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calls wxMessageQueue::Receive.
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For this class a message is an object of arbitrary type T.
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Notice that often there is a some special message indicating that the thread
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should terminate as there is no other way to gracefully shutdown a thread
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waiting on the message queue.
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@nolibrary
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@category{misc}
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@see wxThread
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*/
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class wxMessageQueue<T>
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{
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public:
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/**
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Default and only constructor.
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Use wxMessageQueue::IsOk to check if the object was successfully initialized.
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*/
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wxMessageQueue();
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/**
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Returns @true if the object had been initialized successfully, @false
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if an error occurred.
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*/
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bool IsOk() const;
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/**
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Add a message to this queue and signal the threads waiting for messages
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(i.e. the threads which called wxMessageQueue::Receive or
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wxMessageQueue::ReceiveTimeout).
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This method is safe to call from multiple threads in parallel.
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*/
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wxMessageQueueError Post(T const& msg);
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/**
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Block until a message becomes available in the queue.
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Waits indefinitely long or until an error occurs.
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The message is returned in @a msg.
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*/
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wxMessageQueueError Receive(T& msg);
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/**
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Block until a message becomes available in the queue, but no more than
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@a timeout milliseconds has elapsed.
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If no message is available after @a timeout milliseconds then returns
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@b wxMSGQUEUE_TIMEOUT.
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If @a timeout is 0 then checks for any messages present in the queue
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and returns immediately without waiting.
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The message is returned in @a msg.
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*/
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wxMessageQueueError ReceiveTimeout(long timeout, T& msg);
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};
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