Use in memory user database to improve performance.

I found pinyin's performance is very low when system IO load is big. So
I let pinyin use im memory user database to improve the performance, and
write the database to the harddisk in 60 seconds or when engine exits.

BUG=none
TEST=manual

Review URL: http://codereview.appspot.com/3303041

1 files changed, 19 insertions, 0 deletions

diff --git a/src/PYMain.cc b/src/PYMain.cc
index 463ec2f..021201f 100644
--- a/src/PYMain.cc
+++ b/src/PYMain.cc
@@ -131,6 +131,21 @@ start_component (void)
     ibus_main ();
 }
 
+#include <signal.h>
+
+static void
+sigterm_cb (int sig)
+{
+    PY::Database::finalize ();
+    ::exit (EXIT_FAILURE);
+}
+
+static void
+atexit_cb (void)
+{
+    PY::Database::finalize ();
+}
+
 int
 main (gint argc, gchar **argv)
 {
@@ -148,6 +163,10 @@ main (gint argc, gchar **argv)
         exit (-1);
     }
 
+    ::signal (SIGTERM, sigterm_cb);
+    ::signal (SIGINT, sigterm_cb);
+    g_atexit (atexit_cb);
+
     start_component ();
     return 0;
 }