Date: Mon, 25 Apr 2005 21:19:12 +0800 From: "Mayank Kumar" <mayank@microsoft.com> To: <freebsd-current@freebsd.org> Subject: Query regarding thread safety of few libc stdio functions Message-ID: <3A5384BC2FBA4C488865F2275A036BFF027C1614@APS-MSG-01.southpacific.corp.microsoft.com>
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Hi All Recently I have been looking at few freebsd libc functions and I found That they were not thread safe. Can one of you please confirm. Following functions in freebsd libc are not thread safe:- 1: vsnprintf 2: vsprintf 3: vsscanf theere are many more. Functions like vfprintf are written as follows:- ------------- int ret; FLOCKFILE(fp); ret =3D __vfprintf(fp, fmt0, ap); FUNLOCKFILE(fp); return (ret); ---------------- Which ensures that they are thread safe. Why is the same case not followed for eg with vsnprintf or vsprintf Vsnprintf calls directly __vfprintf which is not thread safe. Hence How is there thready safey guranteed. Any help on this front Would be helpful. Thanks and regards Mayank
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