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5039226 Whitebox animation causes Solaris desktop hang

This problem is caused by a dead lock between java_vm and Xserver:

Xserver is grabbed by java_vm and waiting for XUngrabServer, java_vm

thought XUngrabServer was already sent and sends another dga lock

request to Xserver and blocked on that request. Here is what happened:

java_vm threads calls XGrabServer and XUngrabServer and then

Solaris_DGA_GetLock, it seems no problem, but the current

XUngrabServer requires a XSync call after XUngrabServer in MT

environment to make sure Xserver is ungrabbed *before* new lock

requests come in. Without this XSync, a dead lock may formed just like

this case.

diff -urp -x '*~' -x '*.orig' src/UngrabSvr.c src/UngrabSvr.c

--- src/UngrabSvr.c 2008-10-07 10:18:18.000000000 -0700

+++ src/UngrabSvr.c 2009-04-08 00:18:04.825622000 -0700

@@ -41,6 +41,9 @@ XUngrabServer (

GetEmptyReq(UngrabServer, req);

UnlockDisplay(dpy);

SyncHandle();

+ /* fix for bug 5039226: desktop hangs */

+ if (!dpy->synchandler)

+ XSync(dpy, 0);

return 1;

}