Smarter poll interval

2011-02-06 01:48:57 -05:00
parent fd0a2f06ae
commit 1b48d7f0c9
1 changed files with 13 additions and 3 deletions
@@ -135,7 +135,7 @@ int main( int argc, char *argv[] )
  return 0;
 }

-void tick( Terminal::Emulator *e )
+bool tick( Terminal::Emulator *e )
 {
  static bool initialized = false;
  static struct timeval last_time;
@@ -155,7 +155,11 @@ void tick( Terminal::Emulator *e )
    swrite( STDOUT_FILENO, update.c_str() );
    initialized = true;
    last_time = this_time;
+
+    return true;
  }
+
+  return false;
 }

 void emulate_terminal( int fd, int debug_fd )
@@ -204,8 +208,10 @@ void emulate_terminal( int fd, int debug_fd )

  swrite( STDOUT_FILENO, terminal.open().c_str() );

+  int poll_timeout = -1;
+
  while ( 1 ) {
-    int active_fds = poll( pollfds, 3, 0.02 );
+    int active_fds = poll( pollfds, 3, poll_timeout );
    if ( active_fds < 0 ) {
      perror( "poll" );
      break;
@@ -245,7 +251,11 @@ void emulate_terminal( int fd, int debug_fd )
      break;
    }

-    tick( &terminal );
+    if ( tick( &terminal ) ) { /* there was a frame */
+      poll_timeout = -1;
+    } else {
+      poll_timeout = 20;
+    }
  }

  std::string update = terminal.new_frame();