On Saturday 21 October 2006 00:19, John Baldwin wrote: > jhb 2006-10-20 16:19:21 UTC > > FreeBSD src repository > > Modified files: > sys/kern kern_sig.c > Log: > Remove the check that prevented signals from being delivered to exiting > processes. It was originally added back when support for Linux threads > (and thus shared sigacts objects) was added, but no one knows why. My > guess is that at some point during the Linux threads patches, the sigacts > object was torn down during exit1(), so this check was added to prevent > a panic for that race. However, the stuff that was actually committed to > the tree doesn't teardown sigacts until wait() making the above race > moot. Re-allowing signals here lets one interrupt a NFS request during > process teardown (such as closing descriptors) on an interruptible mount. > > Requested by: kib (long time ago) > MFC after: 1 week > > Revision Changes Path > 1.333 +1 -3 src/sys/kern/kern_sig.c This commit opens a window that may cause memory leak, since we have signal queue in -CURRENT now, signal queue uses memory, before this change, the P_WEXIT will prevents new signal to be queued, after the flag is set in kern_exit, we call signqueue_flush to free memory. I think we should move sigqueue_flush down to a safe point where the PROC lock is no longer unlocked or move it to a place after p_state is set to PRS_ZOMBIE.
David Xu _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/cvs-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"
