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On 24 Aug 2015 18:26, Samuel Thibault wrote: > Rich Felker, le Mon 24 Aug 2015 12:22:50 -0400, a Ãcrit : > > On Mon, Aug 24, 2015 at 05:38:16PM +0200, Samuel Thibault wrote: > > > Andreas Schwab, le Mon 24 Aug 2015 17:30:40 +0200, a Ãcrit : > > > > BZ #18853 shows how the use of the dummy pthread functions in libc can > > > > be harmful if dlopen brings in libpthread by dependency. > > > > > > I have to admit I've always wondered about this case, and never took > > > the time to report the issue, partly because I guessed people wouldn't > > > dlopen() while "owning" a mutex. This can be fixed by making the mutex > > > stubs really modify the mutex, possibly optimized into just not using > > > lock prefixes etc. > > > > > > Not having proper stubs in libc makes applications write their own stubs > > > (see libpthread-stubs in freedesktop for instance), which will suffer > > > from the same issue. > > > > I agree that removing them would be a bad idea, but why not just put > > the actual code (real locking) in the ones in libc.so? > > That would be simpler, yes. > > > (for programs doing dubious stuff to begin with) > > It's usually not programs which call pthread_mutex, but libraries which > want to be thread-safe without actually bringing the libpthread > dependencye. right, and a quick scan of packages i have installed on my system show a number utilizing that mechanism; many are "core" libs. like libxml2 and X11 packages, and a number of multimedia libs. i'm not sure deleting the stubs from glibc is a viable option. -mike
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