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[pf3gnuchains/pf3gnuchains4x.git] / libiberty / fopen_unlocked.c

diff --git a/libiberty/fopen_unlocked.c b/libiberty/fopen_unlocked.c
index b193dfd..d1f78c4 100644 (file)
--- a/libiberty/fopen_unlocked.c
+++ b/libiberty/fopen_unlocked.c
@@ -1,5 +1,5 @@
 /* Implement fopen_unlocked and related functions.
-   Copyright (C) 2005 Free Software Foundation, Inc.
+   Copyright (C) 2005, 2011 Free Software Foundation, Inc.
    Written by Kaveh R. Ghazi <ghazi@caip.rutgers.edu>.
 
 This file is part of the libiberty library.
@@ -15,12 +15,29 @@ Library General Public License for more details.
 
 You should have received a copy of the GNU Library General Public
 License along with libiberty; see the file COPYING.LIB.  If
-not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
+not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
+Boston, MA 02110-1301, USA.  */
 
 /*
 
-@deftypefn Extension FILE * fopen_unlocked (const char *@var{path}, const char * @var{mode})
+@deftypefn Extension void unlock_stream (FILE * @var{stream})
+
+If the OS supports it, ensure that the supplied stream is setup to
+avoid any multi-threaded locking.  Otherwise leave the @code{FILE}
+pointer unchanged.  If the @var{stream} is @code{NULL} do nothing.
+
+@end deftypefn
+
+@deftypefn Extension void unlock_std_streams (void)
+
+If the OS supports it, ensure that the standard I/O streams,
+@code{stdin}, @code{stdout} and @code{stderr} are setup to avoid any
+multi-threaded locking.  Otherwise do nothing.
+
+@end deftypefn
+
+@deftypefn Extension {FILE *} fopen_unlocked (const char *@var{path}, @
+  const char * @var{mode})
 
 Opens and returns a @code{FILE} pointer via @code{fopen}.  If the
 operating system supports it, ensure that the stream is setup to avoid
@@ -29,7 +46,8 @@ unchanged.
 
 @end deftypefn
 
-@deftypefn Extension FILE * fdopen_unlocked (int @var{fildes}, const char * @var{mode})
+@deftypefn Extension {FILE *} fdopen_unlocked (int @var{fildes}, @
+  const char * @var{mode})
 
 Opens and returns a @code{FILE} pointer via @code{fdopen}.  If the
 operating system supports it, ensure that the stream is setup to avoid
@@ -38,7 +56,8 @@ unchanged.
 
 @end deftypefn
 
-@deftypefn Extension FILE * freopen_unlocked (const char * @var{path}, const char * @var{mode}, FILE * @var{stream})
+@deftypefn Extension {FILE *} freopen_unlocked (const char * @var{path}, @
+  const char * @var{mode}, FILE * @var{stream})
 
 Opens and returns a @code{FILE} pointer via @code{freopen}.  If the
 operating system supports it, ensure that the stream is setup to avoid
@@ -59,14 +78,37 @@ unchanged.
 
 #include "libiberty.h"
 
-FILE *
-fopen_unlocked (const char *path, const char *mode)            
+/* This is an inline helper function to consolidate attempts to unlock
+   a stream.  */
+
+static inline void
+unlock_1 (FILE *const fp ATTRIBUTE_UNUSED)
 {
-  FILE *const fp = fopen (path, mode);
 #if defined(HAVE___FSETLOCKING) && defined(FSETLOCKING_BYCALLER)
   if (fp)
     __fsetlocking (fp, FSETLOCKING_BYCALLER);
 #endif
+}
+
+void
+unlock_stream (FILE *fp)
+{
+  unlock_1 (fp);
+}
+
+void
+unlock_std_streams (void)
+{
+  unlock_1 (stdin);
+  unlock_1 (stdout);
+  unlock_1 (stderr);
+}
+
+FILE *
+fopen_unlocked (const char *path, const char *mode)            
+{
+  FILE *const fp = fopen (path, mode);
+  unlock_1 (fp);
   return fp;
 }
 
@@ -74,10 +116,7 @@ FILE *
 fdopen_unlocked (int fildes, const char *mode)
 {
   FILE *const fp = fdopen (fildes, mode);
-#if defined(HAVE___FSETLOCKING) && defined(FSETLOCKING_BYCALLER)
-  if (fp)
-    __fsetlocking (fp, FSETLOCKING_BYCALLER);
-#endif
+  unlock_1 (fp);
   return fp;
 }
 
@@ -85,9 +124,6 @@ FILE *
 freopen_unlocked (const char *path, const char *mode, FILE *stream)
 {
   FILE *const fp = freopen (path, mode, stream);
-#if defined(HAVE___FSETLOCKING) && defined(FSETLOCKING_BYCALLER)
-  if (fp)
-    __fsetlocking (fp, FSETLOCKING_BYCALLER);
-#endif
+  unlock_1 (fp);
   return fp;
 }