Messages in this thread | | | Date | Fri, 07 Dec 2001 18:41:27 +0000 | From | Padraig Brady <> | Subject | Re: horrible disk thorughput on itanium |
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Linus Torvalds wrote:
> On Fri, 7 Dec 2001, Andi Kleen wrote: > >>Your proposals sound rather dangerous. They would silently break recompiled >>threaded programs that need the locking and don't use -D__REENTRANT >> > > No it wouldn't. > > Once you do a pthread_create(), the locking is there. > > Before you do a pthread_create(), it doesn't lock. > > What's the problem? Before you do a pthread_create(), you don't _NEED_ > locking, because there is only one thread that accesses the stdio data > structures. > > And there are no races - if there is only one thread, then another thread > couldn't be suddenly doing a pthread_create() during a stdio operations. > > Safe, and efficient. Yes, it adds a flag test or a indirect branch, but > considering that you avoid a serialized locking instruction, the > optimization sounds obvious. > > Linus
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