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server: Avoid invalid memory access when thread is killed while in wake_up(). (Valgrind).

This commit is contained in:
Sebastian Lackner 2014-06-21 21:50:40 +02:00 committed by Alexandre Julliard
parent 3447567b42
commit 35e56fb042
1 changed files with 8 additions and 4 deletions
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10
server/thread.c
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@ -700,7 +700,7 @@ static int send_thread_wakeup( struct thread *thread, client_ptr_t cookie, int s
}
/* attempt to wake up a thread */
/* return >0 if OK, 0 if the wait condition is still not satisfied */
/* return >0 if OK, 0 if the wait condition is still not satisfied and -1 on error */
int wake_thread( struct thread *thread )
{
int signaled, count;
@ -714,8 +714,11 @@ int wake_thread( struct thread *thread )
if (debug_level) fprintf( stderr, "%04x: *wakeup* signaled=%d\n", thread->id, signaled );
end_wait( thread );
if (send_thread_wakeup( thread, cookie, signaled ) == -1) /* error */
{
if (!count) count = -1;
break;
}
}
return count;
}
@ -865,12 +868,13 @@ static timeout_t select_on( const select_op_t *select_op, data_size_t op_size, c
void wake_up( struct object *obj, int max )
{
struct list *ptr;
int ret;
LIST_FOR_EACH( ptr, &obj->wait_queue )
{
struct wait_queue_entry *entry = LIST_ENTRY( ptr, struct wait_queue_entry, entry );
if (!wake_thread( get_wait_queue_thread( entry ))) continue;
if (max && !--max) break;
if (!(ret = wake_thread( get_wait_queue_thread( entry )))) continue;
if (ret > 0 && max && !--max) break;
/* restart at the head of the list since a wake up can change the object wait queue */
ptr = &obj->wait_queue;
}