1 files changed, 12 insertions, 0 deletions

diff --git a/lib/libc/stdio/fclose.c b/lib/libc/stdio/fclose.c
index 8315c3cf41ea..be9210801b50 100644
--- a/lib/libc/stdio/fclose.c
+++ b/lib/libc/stdio/fclose.c
@@ -42,7 +42,12 @@ static char sccsid[] = "@(#)fclose.c	8.1 (Berkeley) 6/4/93";
 #include <stdio.h>
 #include <stdlib.h>
 #include "local.h"
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+#endif
 
+int
 fclose(fp)
 	register FILE *fp;
 {
@@ -52,6 +57,9 @@ fclose(fp)
 		errno = EBADF;
 		return (EOF);
 	}
+#ifdef _THREAD_SAFE
+	_thread_flockfile(fp,__FILE__,__LINE__);
+#endif
 	r = fp->_flags & __SWR ? __sflush(fp) : 0;
 	if (fp->_close != NULL && (*fp->_close)(fp->_cookie) < 0)
 		r = EOF;
@@ -61,7 +69,11 @@ fclose(fp)
 		FREEUB(fp);
 	if (HASLB(fp))
 		FREELB(fp);
+#ifdef _THREAD_SAFE
+	_thread_funlockfile(fp);
+#endif
 	fp->_flags = 0;		/* Release this FILE for reuse. */
+	fp->_file = -1;
 	fp->_r = fp->_w = 0;	/* Mess up if reaccessed. */
 	return (r);
 }