Hi,
The change in IvyClasspathContainer (asyncExec -> syncExec) may
unfortunately lead
to deadlock situations. If the main thread attempts to execute a job while
the resolve job
is already running, the main thread waits for the resolve job to finish.
The latter then
attempts to syncExec() into the main thread, which won't work.
Thread [Worker-4] (Suspended)
waiting for: RunnableLock (id=122)
Object.wait(long) line: not available [native method]
RunnableLock(Object).wait() line: 503
Synchronizer.syncExec(Runnable) line: 187
Display.syncExec(Runnable) line: 4330
IvyClasspathContainerImpl.setClasspathEntries(IClasspathEntry[])
line: 148
IvyClasspathContainerImpl.updateClasspathEntries(IClasspathEntry[]) line:
144
IvyClasspathResolver.postBatchResolve() line: 40
IvyResolveJob.doRun(IProgressMonitor) line: 263
IvyResolveJob.run(IProgressMonitor) line: 85
Worker.run() line: 54
Thread [main] (Suspended)
owns: RunnableLock (id=122)
waited by: Thread [Worker-4] (Suspended)
waiting for: Object (id=123)
Object.wait(long) line: not available [native method]
Object.wait() line: 503
ThreadJob.waitForRun(ThreadJob, IProgressMonitor, InternalJob,
Thread) line: 272
ThreadJob.joinRun(ThreadJob, IProgressMonitor) line: 199
ImplicitJobs.begin(ISchedulingRule, IProgressMonitor, boolean)
line: 92
JobManager.beginRule(ISchedulingRule, IProgressMonitor) line: 286
WorkManager.checkIn(ISchedulingRule, IProgressMonitor) line: 118
Workspace.prepareOperation(ISchedulingRule, IProgressMonitor)
line: 2282
Folder(Resource).refreshLocal(int, IProgressMonitor) line: 1655
ExternalFoldersManager.createLinkFolder(IPath, boolean, IProject,
IProgressMonitor) line: 155
ExternalFoldersManager.createLinkFolder(IPath, boolean,
IProgressMonitor) line: 145
ExternalFolderChange.updateExternalFoldersIfNecessary(boolean,
IProgressMonitor) line: 48
SetContainerOperation(ChangeClasspathOperation).classpathChanged(ClasspathChange,
boolean) line: 62
SetContainerOperation.executeOperation() line: 110
SetContainerOperation(JavaModelOperation).run(IProgressMonitor)
line: 728
Workspace.run(IWorkspaceRunnable, ISchedulingRule, int,
IProgressMonitor) line: 2344
SetContainerOperation(JavaModelOperation).runOperation(IProgressMonitor)
line: 793
JavaCore.setClasspathContainer(IPath, IJavaProject[],
IClasspathContainer[], IProgressMonitor) line: 4952
IvyClasspathContainerImpl.notifyUpdateClasspathEntries() line: 172
IvyClasspathContainerImpl$1.run() line: 162
RunnableLock.run() line: 35
Synchronizer.runAsyncMessages(boolean) line: 135
Display.runAsyncMessages(boolean) line: 3563
Display.readAndDispatch() line: 3212
...
I'm wondering why the IvyClasspathContainer (now Impl) needs to syncExec()
or asyncExec() at all.
Do you remember why it cannot update the classpath in the background
thread?
Thanks
Carsten
