Imported gcc-4.4.3

[msp430-gcc.git] / libstdc++-v3 / testsuite / performance / 27_io / filebuf_sgetn_unbuf.cc

diff --git a/libstdc++-v3/testsuite/performance/27_io/filebuf_sgetn_unbuf.cc b/libstdc++-v3/testsuite/performance/27_io/filebuf_sgetn_unbuf.cc
new file mode 100644 (file)
index 0000000..1eb3dc5
--- /dev/null
+++ b/libstdc++-v3/testsuite/performance/27_io/filebuf_sgetn_unbuf.cc
@@ -0,0 +1,85 @@
+// Copyright (C) 2004, 2005, 2006, 2007, 2009 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 3, 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 COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+
+#include <cstdio>
+#include <cstdlib>
+#include <fstream>
+#include <testsuite_performance.h>
+
+// libstdc++/11722
+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];
+  const char* name1 = "/usr/share/dict/words";
+  const char* name2 = "/usr/share/dict/linux.words";
+  const char* name = name1;
+
+  // C
+  FILE* file;
+  if (!(file = fopen(name, "r")))
+    {
+      name = name2;
+      if (!(file = fopen(name, "r")))
+       exit(1);
+    }
+  setvbuf(file, 0, _IONBF, 0);
+  start_counters(time, resource);
+  for (int i = 0; i < iterations; ++i)
+    if (fread(chunk, 1, chunksize, file) < chunksize)
+      fseek(file, 0, SEEK_SET);
+  stop_counters(time, resource);
+  fclose(file);
+  report_performance(__FILE__, "C", time, resource);
+  clear_counters(time, resource);
+
+  // C unlocked
+  file = fopen(name, "r");
+  setvbuf(file, 0, _IONBF, 0);
+  start_counters(time, resource);
+  for (int i = 0; i < iterations; ++i)
+    if (fread_unlocked(chunk, 1, chunksize, file) < chunksize)
+      fseek(file, 0, SEEK_SET);
+  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(name, ios_base::in);
+  start_counters(time, resource);
+  for (int i = 0; i < iterations; ++i)
+    if (buf.sgetn(chunk, chunksize) < chunksize)
+      buf.pubseekoff(0, ios::beg);
+  stop_counters(time, resource);
+  report_performance(__FILE__, "C++", time, resource);
+
+  delete [] chunk;
+
+  return 0;
+}