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2021-09-26Fix potential hang when joining threads.Samuel Williams
If the thread termination invokes user code after `th->status` becomes `THREAD_KILLED`, and the user unblock function causes that `th->status` to become something else (e.g. `THREAD_RUNNING`), threads waiting in `thread_join_sleep` will hang forever. We move the unblock function call to before the thread status is updated, and allow threads to join as soon as `th->value` becomes defined. This reverts commit 6505c77501f1924571b2fe620c5c7b31ede0cd22.
2021-09-26Wake up join list within thread EC context. (#4471)Samuel Williams
* Wake up join list within thread EC context. * Consume items from join list so that they are not re-executed. If `rb_fiber_scheduler_unblock` raises an exception, it can result in a segfault if `rb_threadptr_join_list_wakeup` is not within a valid EC. This change moves `rb_threadptr_join_list_wakeup` into the thread's top level EC which initially caused an infinite loop because on exception will retry. We explicitly remove items from the thread's join list to avoid this situation. * Verify the required scheduler interface. * Test several scheduler hooks methods with broken `unblock` implementation.
2020-12-09Add support for non-blocking `Process.wait`.Samuel Williams
Notes: Merged: https://github.com/ruby/ruby/pull/3853
2020-11-08Urgent notification pipe has same lifetime as scheduler.Samuel Williams
Notes: Merged: https://github.com/ruby/ruby/pull/3743
2020-11-08Defer `kernel_sleep` to `block` to avoid exiting the event loop when ↵Samuel Williams
duration is nil. Notes: Merged: https://github.com/ruby/ruby/pull/3743
2020-10-01Raise an exception if the scheduler was already closed.Samuel Williams
Notes: Merged: https://github.com/ruby/ruby/pull/3612
2020-09-24test/fiber/scheduler.rb: Prevent "instance variable @urgent not initialized"Yusuke Endoh
2020-09-21Simplify the implementation of Scheduler#blockBenoit Daloze
* This shows block() with a timeout is similar to #kernel_sleep and also does not need to change `@blocking`.
2020-09-21Make `Thread#join` non-blocking.Samuel Williams
Notes: Merged: https://github.com/ruby/ruby/pull/3558
2020-09-21When setting current thread scheduler to nil, invoke `#close`.Samuel Williams
Notes: Merged: https://github.com/ruby/ruby/pull/3557
2020-09-17Add missing goto found;Benoit Daloze
* To still remove the lock from the Thread's list of acquired locks. * Also to not wake up other waiters and preserve blocking behavior.
2020-09-17Document the various scheduler hooksBenoit Daloze
2020-09-17Call scheduler.block instead of scheduler.kernel_sleep for blocking ↵Benoit Daloze
Queue/SizedQueue operations * scheduler.unblock was already already called before but with no corresponding scheduler.block * add test that Queue#pop makes the scheduler wait until it gets an element.
2020-09-17Rename scheduler.{mutex_lock,mutex_unlock} to {block,unblock}Benoit Daloze
* Move #kernel_sleep next to #block as it is similar
2020-09-17Use a similar pattern for waiting and readyBenoit Daloze
2020-09-16Add a note at the top of the test schedulerBenoit Daloze
2020-09-14Add support for ConditionVariable.Samuel Williams
Notes: Merged: https://github.com/ruby/ruby/pull/3434
2020-09-14Improve handling of urgent notification pipe.Samuel Williams
Notes: Merged: https://github.com/ruby/ruby/pull/3434
2020-09-14Make Mutex per-Fiber instead of per-ThreadBenoit Daloze
* Enables Mutex to be used as synchronization between multiple Fibers of the same Thread. * With a Fiber scheduler we can yield to another Fiber on contended Mutex#lock instead of blocking the entire thread. * This also makes the behavior of Mutex consistent across CRuby, JRuby and TruffleRuby. * [Feature #16792] Notes: Merged: https://github.com/ruby/ruby/pull/3434
2020-09-14Standardised scheduler interface.Samuel Williams
Notes: Merged: https://github.com/ruby/ruby/pull/3434
2020-09-14Simplify bitmasks for IO events.Samuel Williams
Notes: Merged: https://github.com/ruby/ruby/pull/3434
2020-07-20Improve consistency of tests.Samuel Williams
Notes: Merged: https://github.com/ruby/ruby/pull/3323
2020-05-15Move `test/scheduler` -> `test/fiber` [Bug #16892][ruby-core:98366].Samuel Williams
Notes: Merged: https://github.com/ruby/ruby/pull/3110
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