PTHREAD_MUTEX_INIT(3)  FreeBSD Library Functions Manual  PTHREAD_MUTEX_INIT(3)

NAME
     pthread_mutex_init - create a mutex

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <pthread.h>

     int
     pthread_mutex_init(pthread_mutex_t *restrict mutex,
         const pthread_mutexattr_t *restrict attr);

DESCRIPTION
     The pthread_mutex_init() function creates a new mutex, with attributes
     specified with attr.  If attr is NULL the default attributes are used.

RETURN VALUES
     If successful, pthread_mutex_init() will return zero and put the new
     mutex id into mutex, otherwise an error number will be returned to
     indicate the error.

ERRORS
     The pthread_mutex_init() function will fail if:

     [EINVAL]           The value specified by attr is invalid.

     [ENOMEM]           The process cannot allocate enough memory to create
                        another mutex.

SEE ALSO
     pthread_mutex_destroy(3), pthread_mutex_lock(3),
     pthread_mutex_trylock(3), pthread_mutex_unlock(3), pthread_mutexattr(3)

STANDARDS
     The pthread_mutex_init() function conforms to ISO/IEC 9945-1:1996
     ("POSIX.1").

FreeBSD 13.1-RELEASE-p6         August 17, 2018        FreeBSD 13.1-RELEASE-p6