2005-10-01 Ulrich Drepper <drepper@redhat.com>

            Jakub Jelinek  <jakub@redhat.com>

	* descr.h: Define SETXID_BIT and SETXID_BITMASK.  Adjust
	CANCEL_RESTMASK.
	(struct pthread): Move specific_used field to avoid padding.
	Add setxid_futex field.
	* init.c (sighandler_setxid): Reset setxid flag and release the
	setxid futex.
	* allocatestack.c (setxid_signal_thread): New function.  Broken
	out of the bodies of the two loops in __nptl_setxid.  For undetached
	threads check whether they are exiting and if yes, don't send a signal.
	(__nptl_setxid): Simplify loops by using setxid_signal_thread.
	* pthread_create.c (start_thread): For undetached threads, check
	whether setxid bit is set.  If yes, wait until signal has been
	processed.

	* allocatestack.c (STACK_VARIABLES): Initialize them.
	* pthread_create.c (__pthread_create_2_1): Initialize pd.

1 files changed, 12 insertions, 1 deletions

diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
index 122778bddf..f2f206be5a 100644
--- a/nptl/pthread_create.c
+++ b/nptl/pthread_create.c
@@ -314,6 +314,17 @@ start_thread (void *arg)
   if (IS_DETACHED (pd))
     /* Free the TCB.  */
     __free_tcb (pd);
+  else if (__builtin_expect (pd->cancelhandling & SETXID_BITMASK, 0))
+    {
+      /* Some other thread might call any of the setXid functions and expect
+	 us to reply.  In this case wait until we did that.  */
+      do
+	lll_futex_wait (&pd->setxid_futex, 0);
+      while (pd->cancelhandling & SETXID_BITMASK);
+
+      /* Reset the value so that the stack can be reused.  */
+      pd->setxid_futex = 0;
+    }
 
   /* We cannot call '_exit' here.  '_exit' will terminate the process.
 
@@ -354,7 +365,7 @@ __pthread_create_2_1 (newthread, attr, start_routine, arg)
        accessing far-away memory.  */
     iattr = &default_attr;
 
-  struct pthread *pd;
+  struct pthread *pd = NULL;
   int err = ALLOCATE_STACK (iattr, &pd);
   if (__builtin_expect (err != 0, 0))
     /* Something went wrong.  Maybe a parameter of the attributes is