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From: Jeremy F. <je...@go...> - 2003-12-11 04:51:28
|
While playing around with helgrind, I disabled the malloc replacement, so the test was working with the libc malloc/free. This immediately started reporting races. I had thought it was because glibc doesn't bother locking unless there are multiple threads, so it should be enough to set __libc_multiple_threads = 1. It turns out that the problem is a bit more insidious than that. What actually happens is that glibc's libpthread (either linuxthreads or NPTL) actually calls a function __libc_pthread_init(), passing a structure containing pointers to pthread functions. Rather than just calling, say, pthread_mutex_lock, malloc and friends look at this structure, and call the referenced function if it is non-NULL. It seems to me that these function pointers will always be NULL in the Valgrind case, and so glibc is doing a lot of stuff unlocked. It also seems quite hard to fix. Both NPTL and linuxthreads have different versions of __libc_pthread_init() and the pthreads function structure; for each version of libc, they compile their own versions in. We can't really do the same without being fragilely version dependent. This is the first thing which really makes me think that using native pthreads is a good idea... Hm. One point in our favour - it looks like it really is only malloc which uses this stuff. Perhaps our libpthread can arrange to wrap all the malloc calls with serialization, so it isn't a problem... J |