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On Thu, 23 Sep 2004 10:15:12 -0700, Jim Wintermyre <email@hidden> wrote: >>On Wed, 22 Sep 2004 11:43:10 -0400, Peter S Lau <email@hidden> wrote: >>> Do I recall correctly that most (if all) of the file system API's are >>> now thread safe? >> >>The sync version of all the file API's that have both a sync and async >>version are thread safe. > > OK, but are synchronous file system calls *serialized* at the OS > level? i.e. if you call FSRead from one thread, if another thread > calls FSRead is it blocked until the first call completes? This is > still "thread-safe" but obviously has performance implications. While (ALL) file system calls are synchronous in the kernel and are serialized (via a FIFO command buffer) there is some intelligence to pre-fetch and combine pending I/O where there is a performance benefit. -- Enjoy, George Warner, Schizophrenic Optimization Scientist Apple Developer Technical Support (DTS) _______________________________________________ Do not post admin requests to the list. They will be ignored. Mt-smp mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: This email sent to email@hidden
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