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Simon Marlow authored
wakeupThreadOnCapbility() is used to signal another capability that there is a thread waiting to be added to its run queue. It adds the thread to the (locked) wakeup queue on the remote capability. In order to do this, it has to modify the TSO's link field, which has a write barrier. The write barrier might put the TSO on the mutable list, and the bug was that it was using the mutable list of the *target* capability, which we do not have exclusive access to. We should be using the current Capabilty's mutable list in this case.
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