Add lock functions so that malloc and environment variable access are
thread safe. Add the compiler option "-o thread-safe" to use the full
version of newlib which is thread safe.
Note that this patch does NOT make file access thread safe.
Add the locks and flags necessary to make the IAR standard library
thread safe. These changes consist of:
-Add compiler flag "--guard_calls" to ensure C++ function-static
variables with dynamic initializers are initialized in a
thread safe manner
-Add the linker flag "--threaded_lib" so the thread safe version of
the standard library is used
-Implement mutex functions required for IAR thread safety
-Create a set of stub functions in retarget.c for when the rtos is not present
Added an #ifndef directive to the __MBED_CMSIS_RTOS_CM and __CMSIS_RTOS macro definitions in order to prevent "Incompatible redefinition of macro" warnings from the online compiler.
- Allows threads to started separately from when they are declared,
avoiding the need to dynamically allocate threads at runtime.
- Allows multiple threads to join without forceful termination. Allowing
threads to synchronize on cleanup.
Steven Cooreman
Martin Kojtal
Christopher Haster
Russ Butler
Neil Thiessen
Russ Butler
Mihail Stoyanov