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Fix callback_thread CPU overhead by using proper condition variable pattern
Replace broken hidapi_thread_cond_timedwait (which used a fixed absolute timestamp in the past, causing a spin loop) with hidapi_thread_cond_wait using the standard condition variable predicate pattern. - callback_thread: Use cond_wait with proper predicate loop for zero CPU overhead when idle and immediate response on events/shutdown - hid_libusb_hotplug_callback: Protect queue and signal under callback_thread.mutex to prevent lost wakeups - hotplug_thread: Lock mutex before signaling for clean shutdown Agent-Logs-Url: https://github.com/libusb/hidapi/sessions/a47a730b-fbb6-4042-9afb-00e5aa94817d Co-authored-by: Youw <5939659+Youw@users.noreply.github.com>
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