4 files changed, 16 insertions, 0 deletions
diff --git a/newlib/libc/stdio/fclose.c b/newlib/libc/stdio/fclose.c
index b8cd51dc1..630cd4192 100644
--- a/newlib/libc/stdio/fclose.c
+++ b/newlib/libc/stdio/fclose.c
@@ -50,6 +50,7 @@ Required OS subroutines: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>,
 #include <stdio.h>
 #include <stdlib.h>
 #include "local.h"
+#include <sys/lock.h>
 
 /*
  * Close a file.
@@ -84,5 +85,9 @@ _DEFUN (fclose, (fp),
     FREELB (fp);
   fp->_flags = 0;		/* release this FILE for reuse */
   _funlockfile(fp);
+#ifndef __SINGLE_THREAD__
+  __lock_close_recursive (*(_LOCK_RECURSIVE_T *)&fp->_lock);
+#endif
+
   return (r);
 }
diff --git a/newlib/libc/stdio/findfp.c b/newlib/libc/stdio/findfp.c
index 2a907bb6d..efbb62561 100644
--- a/newlib/libc/stdio/findfp.c
+++ b/newlib/libc/stdio/findfp.c
@@ -114,6 +114,10 @@ found:
   fp->_ub._size = 0;
   fp->_lb._base = NULL;		/* no line buffer */
   fp->_lb._size = 0;
+#ifndef __SINGLE_THREAD__
+  memset (&fp->_lock, 0, sizeof(fp->_lock));
+#endif
+
   return fp;
 }
 
diff --git a/newlib/libc/stdio/freopen.c b/newlib/libc/stdio/freopen.c
index 9010adcf7..6d54789da 100644
--- a/newlib/libc/stdio/freopen.c
+++ b/newlib/libc/stdio/freopen.c
@@ -71,6 +71,7 @@ Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
 #include <fcntl.h>
 #include <stdlib.h>
 #include "local.h"
+#include <sys/lock.h>
 
 /*
  * Re-direct an existing, open (probably) file to some other file.
@@ -150,6 +151,9 @@ _DEFUN (_freopen_r, (ptr, file, mode, fp),
       fp->_flags = 0;		/* set it free */
       ptr->_errno = e;		/* restore in case _close clobbered */
       _funlockfile(fp);
+#ifndef __SINGLE_THREAD__
+      __lock_close_recursive (*(_LOCK_RECURSIVE_T *)&fp->_lock);
+#endif
       return NULL;
     }
 
diff --git a/newlib/libc/stdio/vfprintf.c b/newlib/libc/stdio/vfprintf.c
index 7015740e0..c13a7f70f 100644
--- a/newlib/libc/stdio/vfprintf.c
+++ b/newlib/libc/stdio/vfprintf.c
@@ -252,6 +252,9 @@ __sbprintf(fp, fmt, ap)
 	fake._bf._base = fake._p = buf;
 	fake._bf._size = fake._w = sizeof(buf);
 	fake._lbfsize = 0;	/* not actually used, but Just In Case */
+#ifndef __SINGLE_THREAD__
+	memset (&fake._lock, 0, sizeof(fake._lock));
+#endif
 
 	/* do the work, then copy any error status */
 	ret = VFPRINTF(&fake, fmt, ap);