isgraph, isgraph_l — test for a visible character
pthread_setschedprio — dynamic thread scheduling parameters access (REALTIME THREADS)
pthread_mutex_lock, pthread_mutex_trylock, pthread_mutex_unlock — lock and unlock a mutex
posix_trace_create, posix_trace_create_withlog, posix_trace_flush, posix_trace_shutdown — trace stream initialization, flush, and shutdown from a process (TRACING)
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