Add FILE locking stubs for libc.

Change the FILE locking to support kernel threads when linked with
libpthread (which you haven't see yet). This requires that libc become
thread-safe and thread-aware, testing __isthreaded before attempting
to do lock/unlock calls. The impact on non-threaded programs is minor.
This change works with libc_r, so it's the best compromise.

1 files changed, 4 insertions, 11 deletions

diff --git a/lib/libc/stdio/rewind.c b/lib/libc/stdio/rewind.c
index f6609d6..c95adc7 100644
--- a/lib/libc/stdio/rewind.c
+++ b/lib/libc/stdio/rewind.c
@@ -39,27 +39,20 @@
 static char sccsid[] = "@(#)rewind.c	8.1 (Berkeley) 6/4/93";
 #endif
 static const char rcsid[] =
-		"$Id$";
+		"$Id: rewind.c,v 1.5 1997/02/22 15:02:24 peter Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <errno.h>
 #include <stdio.h>
-#ifdef _THREAD_SAFE
-#include <pthread.h>
-#include "pthread_private.h"
-#endif
+#include "libc_private.h"
 
 void
 rewind(fp)
 	register FILE *fp;
 {
-#ifdef _THREAD_SAFE
-	_thread_flockfile(fp,__FILE__,__LINE__);
-#endif
+	FLOCKFILE(fp);
 	(void) fseek(fp, 0L, SEEK_SET);
 	clearerr(fp);
-#ifdef _THREAD_SAFE
-	_thread_funlockfile(fp);
-#endif
+	FUNLOCKFILE(fp);
 	errno = 0;      /* not required, but seems reasonable */
 }