[Bug 209233] [patch] pthread_suspend_all_np races with check_suspend
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Tue May 3 13:14:09 UTC 2016
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209233
Bug ID: 209233
Summary: [patch] pthread_suspend_all_np races with
check_suspend
Product: Base System
Version: 11.0-CURRENT
Hardware: Any
OS: Any
Status: New
Keywords: patch
Severity: Affects Some People
Priority: ---
Component: threads
Assignee: freebsd-threads at FreeBSD.org
Reporter: le277 at cam.ac.uk
Keywords: patch
Created attachment 169926
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=169926&action=edit
Patch to fix race
Currently the suspend all implementation in libthr only sets the NEED_SUSPEND
flag if a thread does not have the SUSPENDED flag set. However, that thread may
be in the process of resuming, and so its NEED_SUSPEND flag should always be
set if we wish a thread to stay suspended, even if already has the SUSPENDED
flag set.
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