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befaee6dd8
Details: - Updated the non-tree openmp and pthreads barriers defined in bli_thrcomm_openmp.c and bli_thrcomm_pthreads.c to instead call a common implementation in bli_thrcomm.c, bli_thrcomm_barrier_atomic(). This new implementation goes through the same motions as the previous codes, but protects its loads and increments with GNU atomic built-ins. These atomic statements take memory ordering parameters that allow us to specify just enough constraints for the barrier to work as intended on weakly-ordered hardware. The prior implementation was only guaranteed to work on systems with strongly- ordered memory. (Thanks to Devin Matthews for suggesting this change and his crash-course in atomics and memory ordering.) - Removed 'volatile' from structs' barrier field declarations in bli_thrcomm_*.h. - Updated bli_thrcomm_pthread.? files to use renamed struct barrier fields consistent with that of the _openmp.? files. - Updated other bli_thrcomm_* files to rename "communicator" variables to simply "comm".