_tolower — transliterate uppercase characters to lowercase
pthread_mutexattr_getpshared, pthread_mutexattr_setpshared — get and set the process-shared attribute
posix_trace_attr_destroy, posix_trace_attr_init — destroy and initialize the trace stream attributes object (TRACING)
pthread_rwlock_trywrlock, pthread_rwlock_wrlock — lock a read-write lock object for writing
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