Bug #1137

- Fixed bug #1137, which caused file locks to be non-blocking (thanks to Steve
  Rader).

src/Context.cpp

@@ -538,6 +538,7 @@ void Context::shadow ()
               " rc.detection:off"   +  // No need to determine terminal size
               " rc.color:off"       +  // Color off by default
               " rc.gc:off "         +  // GC off, to reduce headaches
+              " rc.locking:off"     +  // No file locking
               " rc:" + rcfile + " " +  // Use specified rc file
               command               +  // User specified command
               " >"                  +  // Capture

src/TDB2.cpp

@@ -210,7 +210,7 @@ void TF2::commit ()
       if (_file.open ())
       {
         if (context.config.getBoolean ("locking"))
-          _file.lock ();
+          _file.waitForLock ();
 
         // Write out all the added tasks.
         std::vector <Task>::iterator task;
@@ -333,7 +333,7 @@ void TF2::load_lines ()
   if (_file.open ())
   {
     if (context.config.getBoolean ("locking"))
-      _file.lock ();
+      _file.waitForLock ();
 
     _file.read (_lines);
     _loaded_lines = true;