This is the mail archive of the newlib@sourceware.org mailing list for the newlib project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [PATCH 19/20] unlocked stdio extensions



Index: libc/stdio/putwchar.c
===================================================================
RCS file: /cvs/src/src/newlib/libc/stdio/putwchar.c,v
retrieving revision 1.2
diff -u -p -r1.2 putwchar.c
--- libc/stdio/putwchar.c	12 Dec 2008 17:21:08 -0000	1.2
+++ libc/stdio/putwchar.c	17 Dec 2014 18:27:22 -0000
@@ -26,34 +26,65 @@
 
 /*
 FUNCTION
-<<putwchar>>---write a wide character to standard output
+<<putwchar>>, <<putwchar_unlocked>>---write a wide character to standard output
 
 INDEX
 	putwchar
 INDEX
+	putwchar_unlocked
+INDEX
 	_putwchar_r
+INDEX
+	_putwchar_unlocked_r
 
 ANSI_SYNOPSIS
 	#include <wchar.h>
 	wint_t putwchar(wchar_t <[wc]>);
 
+	#include <wchar.h>
+	wint_t putwchar_unlocked(wchar_t <[wc]>);
+
+	#include <wchar.h>
 	wint_t _putwchar_r(struct _reent *<[reent]>, wchar_t <[wc]>);
 
+	#include <wchar.h>
+	wint_t _putwchar_unlocked_r(struct _reent *<[reent]>, wchar_t <[wc]>);
+
 TRAD_SYNOPSIS
 	#include <wchar.h>
 	wint_t putwchar(<[wc]>)
 	wchar_t <[wc]>;
 
+	#include <wchar.h>
+	wint_t putwchar_unlocked(<[wc]>)
+	wchar_t <[wc]>;
+
+	#include <wchar.h>
 	wint_t _putwchar_r(<[reent]>, <[wc]>)
 	struct _reent *<[reent]>;
 	wchar_t <[wc]>;
 
+	#include <wchar.h>
+	wint_t _putwchar_unlocked_r(<[reent]>, <[wc]>)
+	struct _reent *<[reent]>;
+	wchar_t <[wc]>;
+
 DESCRIPTION
 The <<putwchar>> function or macro is the wide-character equivalent of
 the <<putchar>> function. It writes the wide character wc to stdout.
 
-The alternate function <<_putwchar_r>> is a reentrant version.  The
-extra argument <[reent]> is a pointer to a reentrancy structure.
+<<putwchar_unlocked>> is a non-thread-safe version of <<putwchar>>.
+<<putwchar_unlocked>> may only safely be used within a scope
+protected by flockfile() (or ftrylockfile()) and funlockfile().  This
+function may safely be used in a multi-threaded program if and only
+if they are called while the invoking thread owns the (FILE *)
+object, as is the case after a successful call to the flockfile() or
+ftrylockfile() functions.  If threads are disabled, then
+<<putwchar_unlocked>> is equivalent to <<putwchar>>.
+
+The alternate functions <<_putwchar_r>> and <<_putwchar_unlocked_r>> are
+reentrant versions of the above.  The extra argument <[reent]> is a pointer
+to a reentrancy structure.
 
 RETURNS
 If successful, <<putwchar>> returns its argument <[wc]>.  If an error
@@ -61,7 +92,9 @@ intervenes, the result is <<EOF>>.  You 
 query for errors.
 
 PORTABILITY
-C99
+<<putwchar>> is required by C99.
+
+<<putwchar_unlocked>> is a GNU extension.
 */
 
 #include <_ansi.h>
Index: libc/stdio/putwchar_u.c
===================================================================
RCS file: libc/stdio/putwchar_u.c
diff -N libc/stdio/putwchar_u.c
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ libc/stdio/putwchar_u.c	17 Dec 2014 18:27:22 -0000
@@ -0,0 +1,52 @@
+/*
+ * 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.
+ */
+
+#include <_ansi.h>
+#include <reent.h>
+#include <stdio.h>
+#include <wchar.h>
+#include "local.h"
+
+#undef putwchar_unlocked
+
+wint_t
+_DEFUN(_putwchar_unlocked_r, (ptr, wc),
+	struct _reent *ptr _AND
+	wchar_t wc)
+{
+  return _fputwc_unlocked_r (ptr, wc, stdout);
+}
+
+/*
+ * Synonym for fputwc_unlocked(wc, stdout).
+ */
+wint_t
+_DEFUN(putwchar_unlocked, (wc),
+	wchar_t wc)
+{
+  _REENT_SMALL_CHECK_INIT (_REENT);
+  return fputwc_unlocked (wc, stdout);
+}

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]