Avouid a race in atexit() handling by introducing a lock. Problem

originally reported by Gergely Kovacs; help from dhartmei@;
ok tedu@ millert@

1 files changed, 12 insertions, 1 deletions

diff --git a/src/lib/libc/include/thread_private.h b/src/lib/libc/include/thread_private.h
index 9fbadce008..5fbbf592a4 100644
--- a/src/lib/libc/include/thread_private.h
+++ b/src/lib/libc/include/thread_private.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: thread_private.h,v 1.17 2005/11/15 11:56:40 millert Exp $ */
+/* $OpenBSD: thread_private.h,v 1.18 2006/02/22 07:16:31 otto Exp $ */
 
 /* PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */
 
@@ -123,5 +123,16 @@ void	_thread_malloc_unlock(void);
                                                 _thread_malloc_init();\
                                 } while (0)
 
+void    _thread_atexit_lock(void);
+void    _thread_atexit_unlock(void);
+
+#define _ATEXIT_LOCK()          do {                                    \
+                                        if (__isthreaded)               \
+                                                _thread_atexit_lock();  \
+                                } while (0)
+#define _ATEXIT_UNLOCK()        do {                                    \
+                                        if (__isthreaded)               \
+                                                _thread_atexit_unlock();\
+                                } while (0)
 
 #endif /* _THREAD_PRIVATE_H_ */