Supported msync values: msync.raw, msync.ssb, msync.acq, msync.rel, msync.seq
Stores 'newval' to the memory referenced by 'val' if val is equal to 'equalTo'. This operation is both lock-free and atomic.
See Implementation
Supported msync values: msync.raw, msync.ssb, msync.acq, msync.rel, msync.seq