MFC: 279177
MFC: 279177

sfxge: assert event queue lock in event handlers

It is useful to highlight lock context.

Sponsored by:   Solarflare Communications, Inc.
Approved by:    gnn (mentor)

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase