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2000-12-28  Wolfram Gloger  <wg@malloc.de>

	* malloc/malloc.c (MALLOC_COPY): Handle case if source and
	destination overlap.  Assume dest is always below source if
	overlapping.
This commit is contained in:
Ulrich Drepper
2000-12-31 07:39:50 +00:00
parent c77a447822
commit 09f5e1635a
5 changed files with 56 additions and 39 deletions
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33
linuxthreads/manager.c
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@ -418,7 +418,7 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
new_thread_bottom = (char *) map_addr + guardsize;
new_thread = ((pthread_descr) (new_thread_bottom + stacksize)) - 1;
# else
# else /* !FLOATING_STACKS */
if (attr != NULL)
{
guardsize = page_roundup (attr->__guardsize, granularity);
@ -696,23 +696,24 @@ static void pthread_free(pthread_descr th)
{
size_t guardsize = th->p_guardsize;
/* Free the stack and thread descriptor area */
char *guardaddr = th->p_guardaddr;
/* Guardaddr is always set, even if guardsize is 0. This allows
us to compute everything else. */
size_t stacksize = (char *)(th+1) - guardaddr - guardsize;
#ifdef NEED_SEPARATE_REGISTER_STACK
char *guardaddr = th->p_guardaddr;
/* We unmap exactly what we mapped, in case there was something
else in the same region. Guardaddr is always set, eve if
guardsize is 0. This allows us to compute everything else. */
size_t stacksize = (char *)(th+1) - guardaddr - guardsize;
/* Unmap the register stack, which is below guardaddr. */
munmap((caddr_t)(guardaddr-stacksize),
2 * stacksize + th->p_guardsize);
/* Take account of the register stack, which is below guardaddr. */
guardaddr -= stacksize;
stacksize *= 2;
#endif
#if FLOATING_STACKS
/* Can unmap safely. */
munmap(guardaddr, stacksize + guardsize);
#else
char *guardaddr = th->p_guardaddr;
/* We unmap exactly what we mapped, in case there was something
else in the same region. Guardaddr is always set, eve if
guardsize is 0. This allows us to compute everything else. */
size_t stacksize = (char *)(th+1) - guardaddr - guardsize;
munmap (guardaddr, stacksize + guardsize);
/* Only remap to PROT_NONE, so that the region is reserved in
case we map the stack again later. Avoid collision with
other mmap()s, in particular by malloc(). */
mmap(guardaddr, stacksize + guardsize, PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
#endif
}
}