[pull] master from ruby:master#1179
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rb_postponed_job_trigger_for_ractor(h, running_ractor) runs a preregistered postponed job on running_ractor rather than on the caller's or the main Ractor: the handle's bit is set in a per-Ractor atomic mask and a POSTPONED_JOB interrupt is posted to the Ractor's running EC (or its main thread's EC before it starts running); whichever of the target's threads next checks interrupts drains the mask in rb_postponed_job_flush alongside the VM-global bitset. Delivery is trap-style lazy, like rb_postponed_job_trigger: * the target is not woken out of a blocking call (no unblock function); a blocked Ractor picks the job up at its next natural safepoint, * jobs targeted at a Ractor that exits before checking them are simply discarded with it, * across fork(2), jobs that targeted the forking Ractor survive into the child (it is the child's main Ractor now); jobs for any other Ractor are discarded. The function is internal (declared in vm_core.h) and exported only for ext/-test-/postponed_job for now; the first planned user is per-Ractor GC (handing a terminated Ractor's objspace over to the main Ractor by a main-targeted job). Promoting it to the public C API can be discussed separately.
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