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Do not run tasks when their prerequisites fail #142

Merged
merged 1 commit into from
Jun 22, 2016
Merged

Do not run tasks when their prerequisites fail #142

merged 1 commit into from
Jun 22, 2016

Commits on Jun 22, 2016

  1. Do not run tasks when their prerequisites fail 

    If tasks A and B both depend on C, they race to grab the invocation
lock on C. If A wins, it sets @already_invoked and executes C while
holding the lock. When C completes, A releases the lock, B acquires it
and immediately returns since C is @already_invoked. Unfortunately,
this does not distinguish failed execution of C. Instead, if executing
C raises an exception for A, we want to raise the same exception in B
so it is aborted.
    @ptarjan
    ptarjan committed Jun 22, 2016
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