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2000-12-31  Ulrich Drepper  <drepper@redhat.com>
	* manager.c (pthread_alloca_stack): Remove MAP_FIXED from mmap calls.
	(pthread_free): Always unmap the stack.  It's safe now that we don't
	use MAP_FIXED to allocate stacks.
This commit is contained in:
Ulrich Drepper
2001-01-01 04:49:02 +00:00
parent 1c566118b6
commit af8240ebcb
2 changed files with 8 additions and 14 deletions
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16
linuxthreads/manager.c
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@ -376,7 +376,7 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
map_addr = (caddr_t)((char *)(new_thread + 1) - stacksize / 2);
res_addr = mmap(map_addr, stacksize / 2,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (res_addr != map_addr)
{
/* Bad luck, this segment is already mapped. */
@ -388,7 +388,7 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
map_addr = (caddr_t)new_thread_bottom;
res_addr = mmap(map_addr, stacksize/2,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (res_addr != map_addr)
{
if (res_addr != MAP_FAILED)
@ -449,7 +449,7 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
map_addr = new_thread_bottom - guardsize;
res_addr = mmap(map_addr, stacksize + guardsize,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (res_addr != map_addr)
{
/* Bad luck, this segment is already mapped. */
@ -721,16 +721,8 @@ static void pthread_free(pthread_descr th)
guardaddr -= stacksize;
stacksize *= 2;
#endif
#if FLOATING_STACKS
/* Can unmap safely. */
/* Unmap the stack. */
munmap(guardaddr, stacksize + guardsize);
#else
/* 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
}
}