diff options
| author | Carlos O'Donell <carlos@systemhalted.org> | 2013-08-16 14:57:59 -0400 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2014-02-08 09:21:06 -0500 |
| commit | a5760bbb50f3dbfd1e4051a54aae35060cdd639b (patch) | |
| tree | 87050392c0d80ee6b56edf4e945e144c9521a62a /nptl/pthread_create.c | |
| parent | 6a714e48586aa7f21d2eeef9195cee57c9ebaa60 (diff) | |
| download | glibc-a5760bbb50f3dbfd1e4051a54aae35060cdd639b.tar.gz glibc-a5760bbb50f3dbfd1e4051a54aae35060cdd639b.tar.xz glibc-a5760bbb50f3dbfd1e4051a54aae35060cdd639b.zip | |
nptl: support thread stacks that grow up
http://bugs.gentoo.org/301642
Diffstat (limited to 'nptl/pthread_create.c')
| -rw-r--r-- | nptl/pthread_create.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index 9d7f52f57e..72945cb3f6 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -401,13 +401,26 @@ start_thread (void *arg) #ifdef _STACK_GROWS_DOWN char *sp = CURRENT_STACK_FRAME; size_t freesize = (sp - (char *) pd->stackblock) & ~pagesize_m1; -#else -# error "to do" -#endif assert (freesize < pd->stackblock_size); if (freesize > PTHREAD_STACK_MIN) __madvise (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED); - +#else + /* Page aligned start of memory to free (higher than or equal + to current sp plus the minimum stack size). */ + void *freeblock = (void*)((size_t)(CURRENT_STACK_FRAME + + PTHREAD_STACK_MIN + + pagesize_m1) + & ~pagesize_m1); + char *free_end = (char *) (((uintptr_t) pd - pd->guardsize) & ~pagesize_m1); + /* Is there any space to free? */ + if (free_end > (char *)freeblock) + { + size_t freesize = (size_t)(free_end - (char *)freeblock); + assert (freesize < pd->stackblock_size); + __madvise (freeblock, freesize, MADV_DONTNEED); + } +#endif + /* If the thread is detached free the TCB. */ if (IS_DETACHED (pd)) /* Free the TCB. */ |