Add benchmark example (stress test for prediction overlay)

src/examples/Makefile.am

@@ -1,7 +1,7 @@
 AM_CPPFLAGS = $(protobuf_CFLAGS)
 AM_CXXFLAGS = $(WARNING_CXXFLAGS) $(PICKY_CXXFLAGS) -fno-default-inline -pipe
 
-noinst_PROGRAMS = encrypt decrypt ntester parse termemu
+noinst_PROGRAMS = encrypt decrypt ntester parse termemu benchmark
 
 encrypt_SOURCES = encrypt.cc
 encrypt_CPPFLAGS = -I$(srcdir)/../crypto
@@ -29,3 +29,14 @@ endif
 ntester_SOURCES = ntester.cc
 ntester_CPPFLAGS = -I$(srcdir)/../util -I$(srcdir)/../statesync -I$(srcdir)/../terminal -I$(srcdir)/../network -I$(srcdir)/../crypto -I../protobufs $(BOOST_CPPFLAGS)
 ntester_LDADD = ../statesync/libmoshstatesync.a ../terminal/libmoshterminal.a ../network/libmoshnetwork.a ../crypto/libmoshcrypto.a ../protobufs/libmoshprotos.a -lutil -lm $(BOOST_LDFLAGS) $(protobuf_LIBS)
+
+benchmark_SOURCES = benchmark.cc
+benchmark_CPPFLAGS = -I$(srcdir)/../util -I$(srcdir)/../statesync -I$(srcdir)/../terminal -I../protobufs -I$(srcdir)/../frontend -I$(srcdir)/../crypto $(BOOST_CPPFLAGS) -I$(srcdir)/../network
+benchmark_LDADD = ../frontend/terminaloverlay.o ../statesync/libmoshstatesync.a ../terminal/libmoshterminal.a ../protobufs/libmoshprotos.a ../network/libmoshnetwork.a ../crypto/libmoshcrypto.a -lutil -lm $(BOOST_LDFLAGS) $(protobuf_LIBS)
+if COND_THIRD_LIBSTDDJB
+  benchmark_CPPFLAGS += -I$(top_srcdir)/third/libstddjb
+  benchmark_LDADD += $(top_builddir)/third/libstddjb/libstddjb.a
+else
+  benchmark_CPPFLAGS += $(STDDJB_CPPFLAGS)
+  benchmark_LDADD += $(STDDJB_LDFLAGS)
+endif

src/examples/benchmark.cc

@@ -0,0 +1,96 @@
+/*
+    Mosh: the mobile shell
+    Copyright 2012 Keith Winstein
+
+    This program 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 of the License, or
+    (at your option) any later version.
+
+    This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "config.h"
+
+#include <errno.h>
+#include <locale.h>
+#include <string.h>
+#include <langinfo.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <poll.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <pwd.h>
+#include <signal.h>
+#include <time.h>
+#include <limits.h>
+
+#if HAVE_PTY_H
+#include <pty.h>
+#elif HAVE_UTIL_H
+#include <util.h>
+#endif
+
+extern "C" {
+#include "selfpipe.h"
+}
+
+#include "swrite.h"
+#include "completeterminal.h"
+#include "user.h"
+#include "terminaloverlay.h"
+
+const int ITERATIONS = 100000;
+
+int main( void )
+{
+  Terminal::Framebuffer local_framebuffer( 80, 24 );
+  Overlay::OverlayManager overlays;
+  Terminal::Display display( true );
+  Terminal::Complete local_terminal( 80, 24 );
+
+  /* Adopt native locale */
+  if ( NULL == setlocale( LC_ALL, "" ) ) {
+    perror( "setlocale" );
+    exit( 1 );
+  }
+
+  /* Verify locale calls for UTF-8 */
+  if ( strcmp( nl_langinfo( CODESET ), "UTF-8" ) != 0 ) {
+    fprintf( stderr, "mosh requires a UTF-8 locale.\n" );
+    exit( 1 );
+  }
+
+  for ( int i = 0; i < ITERATIONS; i++ ) {
+    /* type a character */
+    overlays.get_prediction_engine().new_user_byte( 'x', local_framebuffer );
+
+    /* fetch target state */
+    Terminal::Framebuffer new_state( local_terminal.get_fb() );
+
+    /* apply local overlays */
+    overlays.apply( new_state );
+
+    /* calculate minimal difference from where we are */
+    const string diff( display.new_frame( false,
+					  local_framebuffer,
+					  new_state ) );    
+
+    /* make sure to use diff */
+    if ( diff.size() > INT_MAX ) {
+      exit( 1 );
+    }
+
+    local_framebuffer = new_state;
+  }
+
+  return 0;
+}