On Friday, August 30, 2013 9:30:09 am George Liaskos wrote: > Would it be feasible to change the default for 10? > > There is a lot of code that depends on the following behavior: > > void* address = shmat(shmkey, NULL /* desired address */, 0 /* flags */); > // Here we mark the shared memory for deletion. Since we attached it in the > // line above, it doesn't actually get deleted but, if we crash, this means > // that the kernel will automatically clean it up for us. > shmctl(shmkey, IPC_RMID, 0); > if (address == kInvalidAddress) > return NULL; > > The above snip is from Google Chrome, under FreeBSD with the current > defaults that memory becomes unusable. If you don't follow that route > it becomes extremely difficult to cleanup especially in a beast like > Chrome. > > From what I understand PC-BSD defaults to 1, OpenBSD and Linux also > allow this behavior. > > Am I missing something obvious here? It seems to me that the pragmatic > approach is to change this. Hmm, I can see why that is useful though it seems to violate POSIX. This claims that IPC_RMID should delete the segment immediately (which does not seem useful): http://pubs.opengroup.org/onlinepubs/007904975/functions/shmctl.html -- John BaldwinReceived on Fri Aug 30 2013 - 19:16:07 UTC
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