Forum OpenACS Q&A: Re: carnage blender is live on aolserver 4 beta5

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Posted by Andrew Piskorski on
Hm, there still may be some form of race condtion even when properly locking the mutex from Tcl before destroying it, as in both the AOLserver 3.3+ad13 and 4.0beta4 C code, Ns_MutexDestroy calls NsLockFree(mPtr->lock)before calling Ns_MasterLock().

Also, the comment in Ns_MutexDestroy that, "Note this routine is almost never used as mutexes normally exists in memory until the process exits." is simply utterly wrong. Mutex destroy functionality is exposed via the Tcl API, and the Ns_MutexDestroy C function has absolutely no way to know about or implement any policy on when or why ns_mutexes are destroyed.