filebuf_sputn_unbuf.cc: New, adapted from libstdc++/11378.

2004-04-04  Paolo Carlini  <pcarlini@suse.de>
	    Petur Runolfsson  <peturr02@ru.is>

	* testsuite/performance/27_io/filebuf_sputn_unbuf.cc: New,
	adapted from libstdc++/11378.

Co-Authored-By: Petur Runolfsson <peturr02@ru.is>

From-SVN: r80398

libstdc++-v3/ChangeLog

+2004-04-04  Paolo Carlini  <pcarlini@suse.de>
+	    Petur Runolfsson  <peturr02@ru.is>
+
+	* testsuite/performance/27_io/filebuf_sputn_unbuf.cc: New,
+	adapted from libstdc++/11378.
+
 2004-04-03  Paolo Carlini  <pcarlini@suse.de>
 
 	* include/ext/mt_allocator.h (__mt_alloc<>::allocate): Factor out

libstdc++-v3/testsuite/performance/27_io/filebuf_sputn_unbuf.cc

+// Copyright (C) 2004 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+#include <cstdio>
+#include <fstream>
+#include <testsuite_performance.h>
+
+// libstdc++/11378
+int main()
+{
+  using namespace std;
+  using namespace __gnu_test;
+
+  time_counter time;
+  resource_counter resource;
+
+  const int iterations = 500000;
+  const int chunksize = 100;
+
+  char* chunk = new char[chunksize];
+
+  // C
+  FILE* file = fopen("tmp", "w+");
+  setvbuf(file, 0, _IONBF, 0);
+  start_counters(time, resource);
+  for (int i = 0; i < iterations; ++i)
+    fwrite(chunk, 1, chunksize, file);
+  stop_counters(time, resource);
+  fclose(file);
+  report_performance(__FILE__, "C", time, resource);
+  clear_counters(time, resource);
+
+  // C unlocked
+  file = fopen("tmp", "w+");
+  setvbuf(file, 0, _IONBF, 0);
+  start_counters(time, resource);
+  for (int i = 0; i < iterations; ++i)
+    fwrite_unlocked(chunk, 1, chunksize, file);
+  stop_counters(time, resource);
+  fclose(file);
+  report_performance(__FILE__, "C unlocked", time, resource);
+  clear_counters(time, resource);
+
+  // C++
+  filebuf buf;
+  buf.pubsetbuf(0, 0);
+  buf.open("tmp", ios_base::out | ios_base::in | ios_base::trunc);
+  start_counters(time, resource);
+  for (int i = 0; i < iterations; ++i)
+    buf.sputn(chunk, chunksize);
+  stop_counters(time, resource);
+  report_performance(__FILE__, "C++", time, resource);
+
+  unlink("tmp");
+  delete [] chunk;
+
+  return 0;
+}