Date: Tue, 07 Sep 2010 12:02:06 +0200 From: Alex Dupre <ale@FreeBSD.org> To: Alexander Pyhalov <alp@rsu.ru> Cc: freebsd-ports@freebsd.org Subject: Re: libthr and libc Message-ID: <4C860D9E.5030502@FreeBSD.org> In-Reply-To: <4C8600EE.4010000@rsu.ru> References: <4C8600EE.4010000@rsu.ru>
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Alexander Pyhalov ha scritto: > Can someone explain why this stubs are in libc? Why didn't linker just > throw a linking error? Simple explanation: the stubs are there because you can create a thread-safe library and use it in a single-threaded or multi-threaded program. Once linked to a multi-threaded program (with -pthread) the library gets access to the real libthr implementations of the pthread_* functions, while in the single-threaded program the library will use the libc stubs without affecting performance. If you encounter errors probably your program/libraries dynamically loads shared libraries that link with libthr and so you eventually call some pthread_* functions from libc and others from libthr. -- Alex Dupre
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