Remove host_task object management - #2359
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View rendered docs @ https://intelpython.github.io/dpctl/pulls/2359/index.html |
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coverage: 75.044% (+0.09%) from 74.959% — feature/drop-host-task-object-management into master |
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ndgrigorian
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host_task object management to a thread pool based approachhost_task object management
Removed use of host_task that took the GIL and could free a USM allocation, so the task called sycl::free and destroyed a sycl::context inside the host_task. This is forbidden per the SYCL spec, and made dpctl unbuildable against AdaptiveCpp, which does not implement host_task. The releases are now deferred instead via a polling thread. Deprecates SyclQueue._submit_keep_args_alive in favor of SyclQueue.keep_args_alive, intended as a public method for keeping alive these Python objects in a way free of host_task. Also deprecates methods add_event_pair, num_host_task_events, and host_task_events on the SequentialOrderManager, while adding add_event, add_cleanup_event, and num_cleanup_events. _sycl_queue.pyx also gains an atexit hook to prevent crashes at process teardown.
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Inspired by comment in: AdaptiveCpp/AdaptiveCpp#1915
we move away from use of
host_task, which enables compatibility with AdaptiveCpp, and fixes long-standing undefined behavior of callingsycl::freefrom within ahost_task. Thehost_taskdecrementing the refcount would cause theUSMDeleterto be called in its scope, which is undefined behavior under the SYCL specInstead, we use a polling thread which checks for event completion, then decreases references