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Fix aliasing problem in tst-sem11.

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This commit is contained in:
Ulrich Drepper 2009-10-30 09:35:20 -07:00
parent 3005703bb9
commit 9c04f7c155
2 changed files with 12 additions and 8 deletions
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2
nptl/ChangeLog
View File

@ -1,5 +1,7 @@
2009-10-30 Ulrich Drepper <drepper@redhat.com>
* tst-sem11.c (main): Rewrite to avoid aliasing problems.
[BZ #3270]
* allocatestack.c (__nptl_setxid): Perform the operation in multiple
steps to avoid races with creation and terminations.

18
nptl/tst-sem11.c
View File

@ -23,23 +23,25 @@ main (void)
{
int tries = 5;
pthread_t th;
sem_t s;
union
{
sem_t s;
struct new_sem ns;
} u;
again:
if (sem_init (&s, 0, 0) != 0)
if (sem_init (&u.s, 0, 0) != 0)
{
puts ("sem_init failed");
return 1;
}
struct new_sem *is = (struct new_sem *) &s;
if (is->nwaiters != 0)
if (u.ns.nwaiters != 0)
{
puts ("nwaiters not initialized");
return 1;
}
if (pthread_create (&th, NULL, tf, &s) != 0)
if (pthread_create (&th, NULL, tf, &u.s) != 0)
{
puts ("pthread_create failed");
return 1;
@ -62,11 +64,11 @@ main (void)
if (r != PTHREAD_CANCELED && --tries > 0)
{
/* Maybe we get the scheduling right the next time. */
sem_destroy (&s);
sem_destroy (&u.s);
goto again;
}
if (is->nwaiters != 0)
if (u.ns.nwaiters != 0)
{
puts ("nwaiters not reset");
return 1;