Add ACPI subsystem mutex support, currently disabled.  This implements a private mutex we can use to wrap the ACPI subsystem proper.
Add ACPI subsystem mutex support, currently disabled.  This implements
a private mutex we can use to wrap the ACPI subsystem proper.

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