Author: kib
Date: Sat Nov 11 12:16:19 2017
New Revision: 325712
URL: https://svnweb.freebsd.org/changeset/base/325712
Log:
MFC r325389:
C++17 requires quick_exit(3) to be async-signal safe.
Modified:
stable/11/lib/libc/stdlib/quick_exit.3
stable/11/lib/libc/stdlib/quick_exit.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/lib/libc/stdlib/quick_exit.3
==============================================================================
--- stable/11/lib/libc/stdlib/quick_exit.3 Sat Nov 11 12:12:26 2017
(r325711)
+++ stable/11/lib/libc/stdlib/quick_exit.3 Sat Nov 11 12:16:19 2017
(r325712)
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd December 13, 2014
+.Dd November 4, 2017
.Dt QUICK_EXIT 3
.Os
.Sh NAME
@@ -44,6 +44,17 @@ with
.Xr at_quick_exit 3
but not any C++ destructors or cleanup code registered with
.Xr atexit 3 .
+The
+.Xr stdio 3
+file buffers are not flushed.
+.Pp
+The function
+.Fn quick_exit
+is
+.Em async-signal safe
+when the functions registered with
+.Xr at_quick_exit 3
+are.
.Sh RETURN VALUES
The
.Fn quick_exit
Modified: stable/11/lib/libc/stdlib/quick_exit.c
==============================================================================
--- stable/11/lib/libc/stdlib/quick_exit.c Sat Nov 11 12:12:26 2017
(r325711)
+++ stable/11/lib/libc/stdlib/quick_exit.c Sat Nov 11 12:16:19 2017
(r325712)
@@ -26,6 +26,8 @@
* $FreeBSD$
*/
+#include <sys/types.h>
+#include <machine/atomic.h>
#include <stdlib.h>
#include <pthread.h>
@@ -60,6 +62,7 @@ at_quick_exit(void (*func)(void))
h->cleanup = func;
pthread_mutex_lock(&atexit_mutex);
h->next = handlers;
+ __compiler_membar();
handlers = h;
pthread_mutex_unlock(&atexit_mutex);
return (0);
@@ -74,7 +77,9 @@ quick_exit(int status)
* XXX: The C++ spec requires us to call std::terminate if there is an
* exception here.
*/
- for (h = handlers; NULL != h; h = h->next)
+ for (h = handlers; NULL != h; h = h->next) {
+ __compiler_membar();
h->cleanup();
+ }
_Exit(status);
}
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