* libc/include/stdio.h (__SNLK): Define.

* libc/include/stdio_ext.h (FSETLOCKING_QUERY, FSETLOCKING_INTERNAL,
FSETLOCKING_BYCALLER): Define.
(__fsetlocking): Declare.
* libc/stdio/Makefile.am: Build fsetlocking.c.
* libc/stdio/Makefile.in: Regenerate.
* libc/stdio/fsetlocking.c: New file.
* libc/stdio/local.h (_newlib_flockfile_start): Make _flockfile
call dependent on __SNLK flag.
(_newlib_flockfile_exit, _newlib_flockfile_end): Ditto for
_funlockfile calls.
Define all locking macros as empty if __SINGLE_THREAD__.
* libc/stdio/stdio.tex: Include fsetlocking.def.

newlib/ChangeLog

@@ -1,3 +1,19 @@
+2014-12-15  Yaakov Selkowitz  <yselkowi@redhat.com>
+
+	* libc/include/stdio.h (__SNLK): Define.
+	* libc/include/stdio_ext.h (FSETLOCKING_QUERY, FSETLOCKING_INTERNAL,
+	FSETLOCKING_BYCALLER): Define.
+	(__fsetlocking): Declare.
+	* libc/stdio/Makefile.am: Build fsetlocking.c.
+	* libc/stdio/Makefile.in: Regenerate.
+	* libc/stdio/fsetlocking.c: New file.
+	* libc/stdio/local.h (_newlib_flockfile_start): Make _flockfile
+	call dependent on __SNLK flag.
+	(_newlib_flockfile_exit, _newlib_flockfile_end): Ditto for
+	_funlockfile calls.
+	Define all locking macros as empty if __SINGLE_THREAD__.
+	* libc/stdio/stdio.tex: Include fsetlocking.def.
+
 2014-12-15  Nick Hung  <nick@andestech.com>
 
 	* newlib/libc/include/machine/setjmp.h: Add FPU support.

newlib/libc/include/stdio.h

@@ -83,6 +83,7 @@ typedef _fpos64_t fpos64_t;
 #define	__SL64	0x8000		/* is 64-bit offset large file */
 
 /* _flags2 flags */
+#define	__SNLK  0x0001		/* stdio functions do not lock streams themselves */
 #define	__SWID	0x2000		/* true => stream orientation wide, false => byte, only valid if __SORD in _flags is true */
 
 /*

newlib/libc/include/stdio_ext.h

@@ -13,14 +13,18 @@
 
 #include <stdio.h>
 
+#define	FSETLOCKING_QUERY	0
+#define	FSETLOCKING_INTERNAL	1
+#define	FSETLOCKING_BYCALLER	2
+
 _BEGIN_STD_C
 
 void	 _EXFUN(__fpurge,(FILE *));
+int	 _EXFUN(__fsetlocking,(FILE *, int));
 
 /* TODO:
 
    void _flushlbf (void);
-   int __fsetlocking (FILE *__fp, int __type);
 */
 
 #ifdef  __GNUC__

newlib/libc/stdio/Makefile.am

@@ -146,6 +146,7 @@ ELIX_4_SOURCES = \
 	fpurge.c		\
 	fputwc.c		\
 	fputws.c		\
+	fsetlocking.c		\
 	funopen.c		\
 	fwide.c			\
 	fwprintf.c		\
@@ -357,6 +358,7 @@ CHEWOUT_FILES = \
 	fread.def		\
 	freopen.def		\
 	fseek.def		\
+	fsetlocking.def		\
 	fsetpos.def		\
 	ftell.def		\
 	funopen.def		\
@@ -433,6 +435,7 @@ $(lpfx)fputws.$(oext): local.h fvwrite.h
 $(lpfx)fread.$(oext): local.h
 $(lpfx)freopen.$(oext): local.h
 $(lpfx)fseek.$(oext): local.h
+$(lpfx)fsetlocking.$(oext): local.h
 $(lpfx)ftell.$(oext): local.h
 $(lpfx)funopen.$(oext): local.h
 $(lpfx)fvwrite.$(oext): local.h fvwrite.h

newlib/libc/stdio/Makefile.in

@@ -143,6 +143,7 @@ am__objects_2 = $(am__objects_1) lib_a-clearerr.$(OBJEXT) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	lib_a-fpurge.$(OBJEXT) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	lib_a-fputwc.$(OBJEXT) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	lib_a-fputws.$(OBJEXT) \
+@ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	lib_a-fsetlocking.$(OBJEXT) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	lib_a-funopen.$(OBJEXT) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	lib_a-fwide.$(OBJEXT) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	lib_a-fwprintf.$(OBJEXT) \
@@ -206,6 +207,7 @@ am__objects_8 = $(am__objects_7) clearerr.lo fclose.lo fdopen.lo \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	fpurge.lo \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	fputwc.lo \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	fputws.lo \
+@ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	fsetlocking.lo \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	funopen.lo \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	fwide.lo \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	fwprintf.lo \
@@ -514,6 +516,7 @@ GENERAL_SOURCES = \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	fpurge.c		\
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	fputwc.c		\
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	fputws.c		\
+@ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	fsetlocking.c		\
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	funopen.c		\
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	fwide.c			\
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	fwprintf.c		\
@@ -631,6 +634,7 @@ CHEWOUT_FILES = \
 	fread.def		\
 	freopen.def		\
 	fseek.def		\
+	fsetlocking.def		\
 	fsetpos.def		\
 	ftell.def		\
 	funopen.def		\
@@ -1355,6 +1359,12 @@ lib_a-fputws.o: fputws.c
 lib_a-fputws.obj: fputws.c
 	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-fputws.obj `if test -f 'fputws.c'; then $(CYGPATH_W) 'fputws.c'; else $(CYGPATH_W) '$(srcdir)/fputws.c'; fi`
 
+lib_a-fsetlocking.o: fsetlocking.c
+	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-fsetlocking.o `test -f 'fsetlocking.c' || echo '$(srcdir)/'`fsetlocking.c
+
+lib_a-fsetlocking.obj: fsetlocking.c
+	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-fsetlocking.obj `if test -f 'fsetlocking.c'; then $(CYGPATH_W) 'fsetlocking.c'; else $(CYGPATH_W) '$(srcdir)/fsetlocking.c'; fi`
+
 lib_a-funopen.o: funopen.c
 	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-funopen.o `test -f 'funopen.c' || echo '$(srcdir)/'`funopen.c
 
@@ -1772,6 +1782,7 @@ $(lpfx)fputws.$(oext): local.h fvwrite.h
 $(lpfx)fread.$(oext): local.h
 $(lpfx)freopen.$(oext): local.h
 $(lpfx)fseek.$(oext): local.h
+$(lpfx)fsetlocking.$(oext): local.h
 $(lpfx)ftell.$(oext): local.h
 $(lpfx)funopen.$(oext): local.h
 $(lpfx)fvwrite.$(oext): local.h fvwrite.h

newlib/libc/stdio/fsetlocking.c

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2014 Red Hat, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+/*
+FUNCTION
+<<__fsetlocking>>---set or query locking mode on FILE stream
+
+INDEX
+	__fsetlocking
+
+ANSI_SYNOPSIS
+	#include <stdio.h>
+	#include <stdio_ext.h>
+	int __fsetlocking(FILE *<[fp]>, int <[type]>);
+
+DESCRIPTION
+This function sets how the stdio functions handle locking of FILE <[fp]>.
+The following values describe <[type]>:
+
+<<FSETLOCKING_INTERNAL>> is the default state, where stdio functions
+automatically lock and unlock the stream.
+
+<<FSETLOCKING_BYCALLER>> means that automatic locking in stdio functions
+is disabled. Applications which set this take all responsibility for file
+locking themselves.
+
+<<FSETLOCKING_QUERY>> returns the current locking mode without changing it.
+
+RETURNS
+<<__fsetlocking>> returns the current locking mode of <[fp]>.
+
+PORTABILITY
+This function originates from Solaris and is also provided by GNU libc.
+
+No supporting OS subroutines are required.
+*/
+
+#ifndef __rtems__
+
+#include <_ansi.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include "local.h"
+
+int
+_DEFUN(__fsetlocking, (fp, type),
+       FILE * fp _AND
+       int type)
+{
+  int result;
+  CHECK_INIT(_REENT, fp);
+  result = (fp->_flags2 & __SNLK) ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL;
+  switch (type)
+    {
+    case FSETLOCKING_BYCALLER:
+      fp->_flags2 |= __SNLK;
+      break;
+    case FSETLOCKING_INTERNAL:
+      fp->_flags2 &= ~__SNLK;
+      break;
+    case FSETLOCKING_QUERY:
+    default:
+      break;
+    }
+  return result;
+}
+
+#endif /* __rtems__ */

newlib/libc/stdio/local.h

@@ -68,16 +68,19 @@
 	{ \
 	  int __oldfpcancel; \
 	  pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &__oldfpcancel); \
-	  _flockfile (_fp)
+	  if (!(_fp->_flags2 & __SNLK)) \
+	    _flockfile (_fp)
 
 /* Exit from a stream oriented critical section prematurely: */
 # define _newlib_flockfile_exit(_fp) \
-	  _funlockfile (_fp); \
+	  if (!(_fp->_flags2 & __SNLK)) \
+	    _funlockfile (_fp); \
 	  pthread_setcancelstate (__oldfpcancel, &__oldfpcancel);
 
 /* End a stream oriented critical section: */
 # define _newlib_flockfile_end(_fp) \
-	  _funlockfile (_fp); \
+	  if (!(_fp->_flags2 & __SNLK)) \
+	    _funlockfile (_fp); \
 	  pthread_setcancelstate (__oldfpcancel, &__oldfpcancel); \
 	}
 
@@ -99,17 +102,20 @@
 	  pthread_setcancelstate (__oldsfpcancel, &__oldsfpcancel); \
 	}
 
-#else /* !_STDIO_WITH_THREAD_CANCELLATION_SUPPORT */
+#elif !defined(__SINGLE_THREAD__) /* !_STDIO_WITH_THREAD_CANCELLATION_SUPPORT */
 
 # define _newlib_flockfile_start(_fp) \
 	{ \
-		_flockfile(_fp)
+		if (!(_fp->_flags2 & __SNLK)) \
+		  _flockfile (_fp)
 
 # define _newlib_flockfile_exit(_fp) \
-		_funlockfile(_fp); \
+		if (!(_fp->_flags2 & __SNLK)) \
+		  _funlockfile(_fp); \
 
 # define _newlib_flockfile_end(_fp) \
-		_funlockfile(_fp); \
+		if (!(_fp->_flags2 & __SNLK)) \
+		  _funlockfile(_fp); \
 	}
 
 # define _newlib_sfp_lock_start() \
@@ -123,6 +129,15 @@
 		__sfp_lock_release (); \
 	}
 
+#else /* __SINGLE_THREAD__ */
+
+# define _newlib_flockfile_start(_fp)
+# define _newlib_flockfile_exit(_fp)
+# define _newlib_flockfile_end(_fp)
+# define _newlib_sfp_lock_start()
+# define _newlib_sfp_lock_exit()
+# define _newlib_sfp_lock_end()
+
 #endif /* _STDIO_WITH_THREAD_CANCELLATION_SUPPORT */
 
 extern u_char *_EXFUN(__sccl, (char *, u_char *fmt));

newlib/libc/stdio/stdio.tex

@@ -177,6 +177,9 @@ structure.
 @page
 @include stdio/fseek.def
 
+@page
+@include stdio/fsetlocking.def
+
 @page
 @include stdio/fsetpos.def