pub fn reset_executor_for_test()Expand description
Completely reset the global executor to a pristine state.
Clears all task slots, queues, deferred ops, flush/scheduler flags,
and injected ScheduleFlush/TimeSource. Call at the start
of every test to prevent cross-test state leakage.
Note that the signal schedule hook (installed by
init_flush_scheduler via std::sync::OnceLock) persists
across resets — the hook references the global [EXECUTOR]
thread-local, and this function re-initialises that same executor
in place rather than replacing it. This is correct behaviour:
after reset, signal notifications route to the freshly-cleared
global executor.
§Safety / usage
This function is intended only for testing. Calling it while the executor is processing tasks will silently drop all live futures and may cause panics or undefined behavior in running application code.