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SubjectRe: horrible disk thorughput on itanium
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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