RE: [platform-ui-dev] Issues with calling Display.syncExec() in plugin's

["Nick Edgar" <Nick_Edgar@xxxxxxxxxx>]

Aaron,

Technical questions and discussions about using eclipse and eclipse-based 
tools, and developing plug-in tools should be posted to the newsgroups. 
Mailing lists at eclipse.org are intended for use by developers actually 
working on or otherwise contributing to day-to-day development. 

I suggest posting to the eclipse.platform.swt newsgroup: 
http://eclipse.org/newsgroups/index.html.

Thanks,
Nick





"Levinson, Aaron N" <aaron.n.levinson@xxxxxxxxx>
Sent by: platform-ui-dev-admin@xxxxxxxxxxx
06/11/2003 02:22 PM
Please respond to platform-ui-dev
 
        To:     <platform-ui-dev@xxxxxxxxxxx>
        cc: 
        Subject:        RE: [platform-ui-dev] Issues with calling 
Display.syncExec() in plugin's shutdown() method


Hi all,

Well, soon after I sent this e-mail, I was examining the Display class,
and I came across the disposeExec() method.  This Display 'Exec' method
is barely mentioned in the documentation, unlike syncExec() and
asyncExec(), and it seems to do the job.  By passing the Runnable to
Display.getDefault().disposeExec(), the run() method of the Runnable is
now getting called while Eclipse is exiting, and Eclipse terminates
properly now.  I think that this is a proper use of disposeExec(), but
I'm not entirely certain of this from the sparse documentation.  Can
someone confirm/deny?

Thanks,
Aaron Levinson

-----Original Message-----
From: Levinson, Aaron N 
Sent: Wednesday, June 11, 2003 10:55 AM
To: platform-ui-dev@xxxxxxxxxxx
Subject: [platform-ui-dev] Issues with calling Display.syncExec() in
plugin's shutdown() method


Hi all,

I have been encountering difficulties in calling Display.syncExec()
within my plugin's shutdown() method.  Sometimes it works and returns
from Display.syncExec(), but other times, it never returns.  When this
happens, the call stack for the main Java thread is as follows:

Thread [main] (Suspended)
                 Object.wait(long) line: not available [native method]
                 RunnableLock(Object).wait() line: 426
                 Synchronizer.syncExec(Runnable) line: 145
                 Display.syncExec(Runnable) line: 2153
                 MyPlugin.shutdown() line: 243
                 PluginRegistry$2.run() line: 283
                 InternalPlatform.run(ISafeRunnable) line: 889
                 PluginRegistry$1.visit(IPluginDescriptor) line: 296
                 PluginRegistry.accept(IPluginVisitor, boolean) line: 55
                 PluginRegistry.shutdownPlugins() line: 299
                 PluginRegistry.shutdown(IProgressMonitor) line: 265
                 InternalPlatform.loaderShutdown() line: 520
                 NativeMethodAccessorImpl.invoke0(Method, Object, 
Object[]) line:
not available [native method]
                 NativeMethodAccessorImpl.invoke(Object, Object[]) line: 
39
                 DelegatingMethodAccessorImpl.invoke(Object, Object[]) 
line: 25
                 Method.invoke(Object, Object[]) line: 324
                 InternalBootLoader.shutdown() line: 979
                 InternalBootLoader.run(String, URL, String, String[], 
Runnable)
line: 850
                 BootLoader.run(String, URL, String, String[], Runnable) 
line:
461
                 NativeMethodAccessorImpl.invoke0(Method, Object, 
Object[]) line:
not available [native method]
                 NativeMethodAccessorImpl.invoke(Object, Object[]) line: 
39
[local variables unavailable]
                 DelegatingMethodAccessorImpl.invoke(Object, Object[]) 
line: 25
[local variables unavailable]
                 Method.invoke(Object, Object[]) line: 324 [local 
variables
unavailable]
                 Main.basicRun(String[]) line: 291
                 Main.run(String[]) line: 747
                 Main.main(String[]) line: 583

The only threads left running (at least on Windows) are three System
threads, in addition to the main application thread.

Is it okay to call Display.syncExec() from shutdown()?  If so, is there
any way to avoid the problems that I describe above?  Previously, I was
using Display.asyncExec(), but when doing this, sometimes the Runnable
was never run.  If it is not okay to use Display.syncExec(), what are my
alternatives?  What I would really like is some sort of preShutdown()
method in my plug-in, but shutdown() seems to be the only option.

Thanks for any help!

Aaron Levinson
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