Unknown option: "-3" Unix manual page for pthread_mutex_destroy. (host=minya system=Darwin)
PTHREAD_MUTEX_DESTROY(3) BSD Library Functions Manual PTHREAD_MUTEX_DESTROY(3)

NAME
     pthread_mutex_destroy -- free resources allocated for a mutex

SYNOPSIS
     #include <pthread.h>

     int
     pthread_mutex_destroy(pthread_mutex_t *mutex);

DESCRIPTION
     The pthread_mutex_destroy() function frees the resources allocated for
     mutex.

RETURN VALUES
     If successful, pthread_mutex_destroy() will return zero, otherwise an
     error number will be returned to indicate the error.

ERRORS
     The pthread_mutex_destroy() function will fail if:

     [EINVAL]           The value specified by mutex is invalid.

     [EBUSY]            Mutex is locked.

SEE ALSO
     pthread_mutex_init(3), pthread_mutex_lock(3), pthread_mutex_trylock(3),
     pthread_mutex_unlock(3)

STANDARDS
     The pthread_mutex_destroy() function conforms to ISO/IEC 9945-1:1996
     (``POSIX.1'').

BSD                              July 29, 1998                             BSD