site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Yes, please. A kernel race between kevent engine and the process state is really important to understand, especially if you have a test case. The hardest part of fixing a race is a solid test case. Godfrey PS. I've been waxing philosophical on race conditions for a while. The nature of a race condition is that it hides until you uncover it by changing the timing between a pair of threads, a classic case of "you milage may vary". (I've been exploring evolutionary metaphors for a while in which a programmer is the mutagens; sorry I can be a boring on this subject) On 2009-11-22, at 15:27 , Damien Sorresso wrote:

On Nov 21, 2009, at 8:23 PM, Dave Keck wrote:

...

For the archives:

After some stress testing, I've found that there is in fact a race between when kevent() reports that a process exited, and when waitpid() can successfully reap the process. Therefore, it is not safe to use the WNOHANG option with waitpid() and friends to reap a child process, after observing that the child process exited using kevent().

Could you file a bug on this and attach a test case? -- Damien Sorresso BSD Engineering Apple Inc.

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