f9b99e7eac
* gtk/ThreadNotify.cs: New file, used to notify invoke code in the main Gtk thread. svn path=/trunk/gtk-sharp/; revision=6712
89 lines
2 KiB
C#
89 lines
2 KiB
C#
//
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// ThreadNotify.cs: implements a notification for the thread running the Gtk main
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// loop from another thread
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//
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// Author:
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// Miguel de Icaza (miguel@ximian.com).
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//
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// (C) 2002 Ximian, Inc.
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//
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namespace Gtk {
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using System.Runtime.InteropServices;
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using System.Threading;
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using System;
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// <summary>
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// This delegate will be invoked on the main Gtk thread.
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// </summary>
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delegate void ReadyEvent ();
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/// <summary>
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/// Utility class to help writting multi-threaded Gtk applications
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/// </summary>
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/// <remarks>
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///
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public class ThreadNotify {
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//
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// DllImport functions from Gtk
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//
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[DllImport ("gtk-x11-2.0")]
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public static extern int gdk_input_add (int s, int cond, GdkInputFunction f, IntPtr data);
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public delegate void GdkInputFunction (IntPtr data, int source, int cond);
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//
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// Libc stuff
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//
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[DllImport ("libc.so.6")]
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public static extern int pipe (int [] fd);
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[DllImport ("libc.so.6")]
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public static extern unsafe int read (int fd, byte *b, int count);
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[DllImport ("libc.so.6")]
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public static extern unsafe int write (int fd, byte *b, int count);
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GdkInputFunction notify_pipe;
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int [] pipes;
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ReadyEvent re;
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/// <summary>
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/// The ReadyEvent delegate will be invoked on the current thread (which should
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/// be the Gtk thread) when another thread wakes us up by calling WakeupMain
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/// </summary>
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public ThreadNotify (ReadyEvent re)
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{
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notify_pipe = new GdkInputFunction (NotifyPipe);
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pipes = new int [2];
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pipe (pipes);
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gdk_input_add (pipes [0], 1, notify_pipe, (IntPtr) 0);
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this.re = re;
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}
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void NotifyPipe (IntPtr data, int source, int cond)
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{
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byte s;
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unsafe {
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read (pipes [0], &s, 1);
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}
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re ();
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}
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/// <summary>
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/// Invoke this function from a thread to call the `ReadyEvent'
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/// delegate provided in the constructor on the Main Gtk thread
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/// </summary>
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public void WakeupMain ()
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{
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unsafe {
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byte s;
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write (pipes [1], &s, 1);
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}
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}
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}
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}
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