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4603324eb0
Details: - Defined and implemented a new pthread-like abstract datatype and API in bli_pthread.c. The new type, bli_pthread_switch_t, is similar to bli_pthread_once_t in some respects. The idea is that like a switch in your home that controls a light or ceiling fan, it can either be on or off. The switch starts in the off state. Moving from one state to the other (on to off; off to on) causes some action (i.e., a startup or shutdown function) to be executed. Trying to move from one state to the same state (on to on; off to off) is safe in that it results in no action. Unlike bli_pthread_once(), the API for bli_pthread_switch_t contains both _on() and _off() interfaces. Also, unlike the _once() function, the _on() and _off() functions return error codes so that the 'int' error code returned from the startup or shutdown functions may be passed back to the caller. Thanks to Devin Matthews for his input and feedback on this feature. - Replaced the previous implementation of bli_init_once() and bli_finalize_once() -- both of which used bli_pthread_once() -- with ones that rely upon bli_pthread_switch_on() and _switch_off(), respectively. This also required updating the return types of _init_apis() and _finalize_apis() to match the function pointer type required by bli_pthread_switch_on()/_switch_off(). - Comment updates.