Move isOkToBlock tracking to osdThread.
Targets except vxworks can store this flag in epicsThreadOSD.
Continue to use TLS w/ vxWorks.
Note that setting of isOkToBlock for "main" thread becomes lazy.
Besides being deprecated in C++11 and removed in C++17, the intended use
case for this was always wrong, since std::unexpected() is called by the
C++ runtime when a function throws an exception that was not specified
in its "dynamic exception specification", which is different from an
exception thrown by user code which wasn't caught [1,2]. Using abort()
keeps the same behavior, but with the intended semantics.
We don't use std::abort() to simplify backwards compatibility.
[1] https://github.com/epics-base/epics-base/issues/343
[2] https://en.cppreference.com/w/cpp/error/unexpected
In some cases the license-identification header was missing,
so I added that as well. Replaced the remaining headers that
specifically identified "Versions 3.13.7 and higher".
Makefiles and the build system were deliberately excluded.
* lp-Com/use-monotonic:
VxWorks: Measure CPU time-base frequency if necessary
replace most internal getCurrent() -> getMonotonic()
dbScan periodic scan use monotonic time
monotonic adapt to regular time APIs
