I have a question regarding LL/SC implementation in gem5. For example, if thread 1 performs a LL operation, it sets locked flag to context id. During SC operation, lock flag is cleared. It releases the lock using normal store and lock flag is cleared during any WB.
If another thread (id 2) tries to perform a LL operation, while thread 1 is in CR, it will set flag to its context id. The question I have is what will prevent thread 2 SC from succeeding while thread 1 is in CR. I am unable to find a condition that checks if another thread is executing CR. I would really appreciate if someone could clarify this for me. Thanks, Anusha
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