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Ian Lynagh authored
We only need to apply the write barrier to an MVar when it acquires a reference to live data; when the MVar is left empty in the case of a takeMVar/putMVar, we can save a memory reference. Patch from Edward Z. Yang.
5d9e686c
We only need to apply the write barrier to an MVar when it acquires a reference to live data; when the MVar is left empty in the case of a takeMVar/putMVar, we can save a memory reference. Patch from Edward Z. Yang.