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PTHREAD_BARRIERATT... DragonFly Library Functions Manual PTHREAD_BARRIERATT...


NAME

     pthread_barrierattr_destroy, pthread_barrierattr_getpshared,
     pthread_barrierattr_init, pthread_barrierattr_setpshared -- manipulate a
     barrier attribute object


LIBRARY

     POSIX Threads Library (libpthread, -lpthread)


SYNOPSIS

     #include <pthread.h>

     int
     pthread_barrierattr_destroy(pthread_barrierattr_t *attr);

     int
     pthread_barrierattr_getpshared(const pthread_barrierattr_t * restrict attr,
         int * restrict pshared);

     int
     pthread_barrierattr_init(pthread_barrierattr_t *attr);

     int
     pthread_barrierattr_setpshared(pthread_barrierattr_t *attr, int pshared);


DESCRIPTION

     The pthread_barrierattr_init() function will initialize attr with default
     attributes.  The pthread_barrierattr_destroy() function will destroy attr
     and release any resources that may have been allocated on its behalf.

     The pthread_barrierattr_getpshared() function will put the value of the
     process-shared attribute from attr into the memory area pointed to by
     pshared.  The pthread_barrierattr_setpshared() function will set the
     process-shared attribute of attr to the value specified in pshared.  The
     argument pshared may have one of the following values:

     PTHREAD_PROCESS_PRIVATE  The barrier object it is attached to may only be
                              accessed by threads in the same process as the
                              one that created the object.

     PTHREAD_PROCESS_SHARED   The barrier object it is attached to may be
                              accessed by threads in processes other than the
                              one that created the object.


RETURN VALUES

     If successful, all these functions will return zero.  Otherwise, an error
     number will be returned to indicate the error.

     None of these functions will return EINTR.


ERRORS

     The pthread_barrierattr_destroy(), pthread_barrierattr_getpshared() and
     pthread_barrierattr_setpshared() functions may fail if:

     [EINVAL]           The value specified by attr is invalid.

     The pthread_barrierattr_init() function will fail if:

     [ENOMEM]           Insufficient memory to initialize the barrier
                        attribute object attr.

     The pthread_barrierattr_setpshared() function will fail if:

     [EINVAL]           The value specified in pshared is not one of the
                        allowed values.


SEE ALSO

     pthread_barrier_destroy(3), pthread_barrier_init(3),
     pthread_barrier_wait(3)


BUGS

     The implementation of barriers does not fully conform to IEEE Std 1003.2
     (``POSIX.2'') because the process-shared attribute is ignored; if any
     value other than PTHREAD_PROCESS_PRIVATE is specified in a call to
     pthread_barrierattr_setpshared(), it will return EINVAL.

DragonFly 5.1                  February 22, 2018                 DragonFly 5.1

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