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| author | Carlos O'Donell <carlos@systemhalted.org> | 2015-08-09 04:17:17 -0400 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2016-02-19 12:41:29 -0500 |
| commit | d615a47355699d29df01b28a120cef29c8a38091 (patch) | |
| tree | a60b5cd1dddc6bb30e409601dad08f09a601993b /nptl/pthread_create.c | |
| parent | 11fca9615fa7b98135d262066db5f4156dd72955 (diff) | |
| download | glibc-d615a47355699d29df01b28a120cef29c8a38091.tar.gz glibc-d615a47355699d29df01b28a120cef29c8a38091.tar.xz glibc-d615a47355699d29df01b28a120cef29c8a38091.zip | |
nptl: support thread stacks that grow up
Gentoo has been carrying this for all arches since 2.17. URL: http://bugs.gentoo.org/301642
Diffstat (limited to 'nptl/pthread_create.c')
| -rw-r--r-- | nptl/pthread_create.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index 5216041733..a834063ad5 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -427,12 +427,25 @@ START_THREAD_DEFN #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)) |