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instance method
Fiber::SchedulerInterface#block
block(blocker, timeout = nil)
cont.c
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static VALUE
rb_fiber_scheduler_interface_block(VALUE self)
{
}
Invoked by methods like Thread.join, and by Mutex, to signify that current Fiber is blocked till further notice (e.g. unblock) or till timeout will pass.
blocker is what we are waiting on, informational only (for debugging and logging). There are no guarantees about its value.
Expected to return boolean, specifying whether the blocking operation was successful or not.