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[OpenBSD] signal() Man Page
[MKS] pthread_cancel() Man Page
[Open Group 2004] Threads Overview
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POS41-C. When a thread exit status is not of concern, pthread_detach() or an equivalent function must be used 50. POSIX (POS) POS45-C. Avoid memory leaks and clean up thread-specific data for a key by defining an explicit destructor