Add atomic load and store functions, and add barriers to the existing atomic
functions.
File currently has no explicit barriers - we don't support SMP, so don't
need CPU barriers.
But we do need to worry about compiler barriers - particularly if link time
optimisation is activated so that the compiler can see inside these
functions. The assembler or intrinsics that access PRIMASK for
enter/exit critical act as barriers, but LDREX, STREX and simple
volatile pointer loads and stores do not.
- Move macro definition to mbed_toolchain.h
- Remove double underscores from macro which are reserved.
- Fix macro for IAR until compiler flags to disable path are added again.
Existing ATParser is extended to use FileHandle. This essentially detaches
ATParser from previous tight binding with various implementations of serial
interfaces with buffering.
Now the ATParser uses only abstract FileHandle and doesn't really care about
the underlying implementation. Underneath, it could be a USB device type FileHandle
or a Serial device type FileHandle etc.
Some simplification steps were taken as the code provided opportunities to simplify
and optimize.
Kevin Bracey
Martin Kojtal
kegilbert
Michal Paszta
ccli8
Steven Cartmell
Vincent Coubard
Senthil Ramakrishnan
Chris Snow
Jimmy Brisson
Christopher Haster
Hasnain Virk