The implementation using select() limits file desciptors to FD_SETSIZE,
typically 1024 on Linux. This number is too low for some applications,
for example for the CA gateway.
Therefore, Linux builds use poll() instead.
This flag causes EPICS to call abort() on assertion failures rather than
suspend the executing thread. With the epicsThreadSuspendSelf() behavior,
an IOC can end up in a difficult to detect error state where one or more
threads has essentially crashed due to an assertion failure.
This also matches the C behavior of assert(3)
Save/restore dbAddr::pfield around callbacks to
avoid corruption if CB forgets to restore.
Need to peak at dbChannel.h during libCom build.
So generate dbCoreAPI.h early, and add extra
-I to source location when compiling dbTrapWrite.c
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
The call to setThreadName() is moved to avoid a race condition that
can happen with very short lived processes. If the process terminates
very quickly e.g. is a google test runner or the msi.exe command
called from a Makefile during a build, then very occasionally a
crash can occur during process termination if setThreadName() when called
from the newly created thread. This looks to be becauae the DLL it is
trying to call gets unloaded between it getting a handle to the DLL
and making the call. Moving the setThreadName() call to the creating
thread avoids this problem. The issue was only ever seen with statically
linked epics executables, I am unsure if the way a DLL based epics
program unloads might avoid this, or just make it less likely but
still possible. As mentioned above, the issue will only ever occur
to threads that are created during process termination and so would
not affect running IOCs
