Joerg Sonnenberger 01ad902588 Autogen: Redo locking and state machine for fence handling and the worker pool ...

(1) All CV use must hold the corresponding mutex, otherwise race
conditions happen. This is mandated by the C++ standard.

(2) Introduce a separate CV for the thread waiting for other jobs to
finish before running a fence. This avoids waking up all other workers
blindly. Correctly wake that thread up when the processing of outstanding
jobs is done.

(3) Split the waiting for a fence to become runnable from a fence is
pending. This avoids problems if more than one fence can end up on the
queue. The thread that took a fence off the queue is responsible for
clearing the fence processing flag.

2020-05-21 16:17:36 -04:00

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