bcb4e51a409d94ae670de96afb8483a4f7855294Stephan Bosch###############################################################################
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83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo Sirainen5039226 Whitebox animation causes Solaris desktop hang
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo SirainenThis problem is caused by a dead lock between java_vm and Xserver:
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo SirainenXserver is grabbed by java_vm and waiting for XUngrabServer, java_vm
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo Sirainenthought XUngrabServer was already sent and sends another dga lock
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo Sirainenrequest to Xserver and blocked on that request. Here is what happened:
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo Sirainenjava_vm threads calls XGrabServer and XUngrabServer and then
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo SirainenSolaris_DGA_GetLock, it seems no problem, but the current
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo SirainenXUngrabServer requires a XSync call after XUngrabServer in MT
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo Sirainenenvironment to make sure Xserver is ungrabbed *before* new lock
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo Sirainenrequests come in. Without this XSync, a dead lock may formed just like
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo Sirainen@@ -39,6 +39,9 @@ XUngrabServer (
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo Sirainen GetEmptyReq(UngrabServer, req);
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo Sirainen UnlockDisplay(dpy);
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo Sirainen SyncHandle();
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo Sirainen+ /* fix for bug 5039226: desktop hangs */
83942ac160cdfb922c3a2f29ddfae2a13ebf8b5dTimo Sirainen+ if (!dpy->synchandler)
e2a88d59c0d47d63ce1ad5b1fd95e487124a3fd4Timo Sirainen+ XSync(dpy, 0);