Fix the handle locking in stdio
Fix the handle locking in stdio to use flockfile/funlockfile
internally when and where required. Macros in <stdio.h> are updated
to automatically call the underlying functions when the process is
threaded to obtain the necessary locking. A private mutex is added
to protect __sglue, the internal list of FILE handles, and another
to protect the one-time initialization. Some routines in libc that
use getc() change to use getc_unlocked() as they're either protected
by their own lock or aren't thread-safe routines anyway.
Based on OpenBSD change by guenther@openbsd.org
http://www.mail-archive.com/source-changes@cvs.openbsd.org/msg01015.html
Bug: 3446659
Change-Id: Ie82116e358c541718d6709ec45ca6796be5a007b
diff --git a/libc/stdio/getc.c b/libc/stdio/getc.c
index cdd5722..16a5b1d 100644
--- a/libc/stdio/getc.c
+++ b/libc/stdio/getc.c
@@ -32,6 +32,7 @@
*/
#include <stdio.h>
+#include "local.h"
/*
* A subroutine version of the macro getc_unlocked.
@@ -54,8 +55,8 @@
{
int c;
- flockfile(fp);
+ FLOCKFILE(fp);
c = __sgetc(fp);
- funlockfile(fp);
+ FUNLOCKFILE(fp);
return (c);
}