`pthread_attr_getdetachstate.3p` ( 3 )

получить и установить атрибут detachstate (get and set the detachstate attribute)

Пролог (Prolog)

This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

Имя (Name)

pthread_attr_getdetachstate, pthread_attr_setdetachstate — get and set the detachstate attribute

Синопсис (Synopsis)

#include <pthread.h>

int pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate); int pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate);

Описание (Description)

The detachstate attribute controls whether the thread is created in a detached state. If the thread is created detached, then use of the ID of the newly created thread by the pthread_detach() or pthread_join() function is an error.

The pthread_attr_getdetachstate() and pthread_attr_setdetachstate() functions, respectively, shall get and set the detachstate attribute in the attr object.

For pthread_attr_getdetachstate(), detachstate shall be set to either PTHREAD_CREATE_DETACHED or PTHREAD_CREATE_JOINABLE.

For pthread_attr_setdetachstate(), the application shall set detachstate to either PTHREAD_CREATE_DETACHED or PTHREAD_CREATE_JOINABLE.

A value of PTHREAD_CREATE_DETACHED shall cause all threads created with attr to be in the detached state, whereas using a value of PTHREAD_CREATE_JOINABLE shall cause all threads created with attr to be in the joinable state. The default value of the detachstate attribute shall be PTHREAD_CREATE_JOINABLE.

The behavior is undefined if the value specified by the attr argument to pthread_attr_getdetachstate() or pthread_attr_setdetachstate() does not refer to an initialized thread attributes object.

Возвращаемое значение (Return value)

Upon successful completion, pthread_attr_getdetachstate() and pthread_attr_setdetachstate() shall return a value of 0; otherwise, an error number shall be returned to indicate the error.

The pthread_attr_getdetachstate() function stores the value of the detachstate attribute in detachstate if successful.

Ошибки (Error)

The pthread_attr_setdetachstate() function shall fail if:

EINVAL The value of detachstate was not valid

These functions shall not return an error code of [EINTR].

The following sections are informative.

Примеры (Examples)

Retrieving the detachstate Attribute
       This example shows how to obtain the detachstate attribute of a
       thread attribute object.

           #include <pthread.h>

           pthread_attr_t thread_attr;
           int            detachstate;
           int            rc;

           /* code initializing thread_attr */
           ...

           rc = pthread_attr_getdetachstate (&thread_attr, &detachstate);
           if (rc!=0) {
               /* handle error */
               ...
           }
           else {
               /* legal values for detachstate are:
                * PTHREAD_CREATE_DETACHED or PTHREAD_CREATE_JOINABLE
                */
                ...
           }

Использование в приложениях (Application usage)

None.

Обоснование (Rationale)

If an implementation detects that the value specified by the attr argument to pthread_attr_getdetachstate() or pthread_attr_setdetachstate() does not refer to an initialized thread attributes object, it is recommended that the function should fail and report an [EINVAL] error.

Будущие направления (Future directions)