* Set preemption threshold for Preemption-Threshold Scheduling (PTS) * * Parameters: * tid: Target thread * threshold: Preemption threshold (must be <= thread priority) * old_threshold: Output parameter for previous threshold (can be NULL) * * Preemption Rule: Thread j can preempt thread i iff priority(j) < threshold(i) * * Constraints: * - threshold must be <= thread priority (n
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