Проект OpenNet: MAN pthread_barrierattr_setpshared (3) Библиотечные вызовы (FreeBSD и Linux)

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pthread_barrierattr_setpshared (3)

>> pthread_barrierattr_setpshared (3) ( FreeBSD man: Библиотечные вызовы )

pthread_barrierattr_setpshared (3) ( POSIX man: Библиотечные вызовы )

BSD mandoc

NAME



pthread_barrierattr_destroy , pthread_barrierattr_getpshared

 
pthread_barrierattr_init , pthread_barrierattr_setpshared

 - manipulate a barrier attribute object

LIBRARY

Lb libpthread

SYNOPSIS

#include <pthread.h>
int pthread_barrierattr_destroy (pthread_barrierattr_t *attr);
int pthread_barrierattr_getpshared (const pthread_barrierattr_t *attr int *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 Fa attr with default attributes. The pthread_barrierattr_destroy ();
function will destroy Fa 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 Fa attr into the memory area pointed to by Fa pshared . The pthread_barrierattr_setpshared ();
function will set the process-shared attribute of Fa attr to the value specified in Fa pshared . The argument Fa 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 Er EINTR .

ERRORS

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

Bq Er EINVAL: The value specified by Fa attr is invalid.

The pthread_barrierattr_init ();
function will fail if:

Bq Er ENOMEM: Insufficient memory to initialize the barrier attribute object Fa attr .

The pthread_barrierattr_setpshared ();
function will fail if:

Bq Er EINVAL: The value specified in Fa pshared is not one of the allowed values.

HISTORY

The pthread_barrierattr_ (*);
functions first appeared in Lb libkse in Fx 5.2 , and in Lb libthr in Fx 5.3 .

BUGS

The implementation of barriers does not fully conform to St -p1003.2 because the process-shared attribute is ignored in Lb libthr , and in Lb libkse ; if any value other than PTHREAD_PROCESSES_PRIVATE is specified in a call to pthread_barrierattr_setpshared (,);
it will return Er EINVAL .