pthread_attr(3) - NetBSD Manual Pages

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PTHREAD_ATTR(3)         NetBSD Library Functions Manual        PTHREAD_ATTR(3)


NAME

     pthread_attr_init, pthread_attr_destroy, pthread_attr_setdetachstate,
     pthread_attr_getdetachstate, pthread_attr_setschedparam,
     pthread_attr_getschedparam -- thread attribute operations


LIBRARY

     POSIX Threads Library (libpthread, -lpthread)


SYNOPSIS

     #include <pthread.h>

     int
     pthread_attr_init(pthread_attr_t *attr);

     int
     pthread_attr_destroy(pthread_attr_t *attr);

     int
     pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate);

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

     int
     pthread_attr_setschedparam(pthread_attr_t * restrict attr,
         const struct sched_param * restrict param);

     int
     pthread_attr_getschedparam(const pthread_attr_t * restrict attr,
         struct sched_param * restrict param);


DESCRIPTION

     Thread attributes are used to specify parameters to pthread_create().
     One attribute object can be used in multiple calls to pthread_create(),
     with or without modifications between calls.

     The pthread_attr_init() function initializes attr with all the default
     thread attributes.

     The pthread_attr_destroy() function destroys attr.

     The pthread_attr_set*() functions set the attribute that corresponds to
     each function name.

     The pthread_attr_get*() functions copy the value of the attribute that
     corresponds to each function name to the location pointed to by the sec-
     ond function parameter.

     The attribute parameters for the pthread_attr_setdetachstate() and
     pthread_attr_getdetachstate() are mutually exclusive and must be one of:

     PTHREAD_CREATE_JOINABLE
               The threads must explicitly be waited for using the
               pthread_join() function once they exit for their status to be
               received and their resources to be freed.  This is the default.

     PTHREAD_CREATE_DETACHED
               The thread's resources will automatically be freed once the
               thread exits, and the thread will not be joined.


RETURN VALUES

     If successful, these functions return 0.  Otherwise, an error number is
     returned to indicate the error.


ERRORS

     pthread_attr_init() shall fail if:

     [ENOMEM]           Out of memory.

     pthread_attr_destroy() may fail if:

     [EINVAL]           The value specified by attr is invalid.

     pthread_attr_setdetachstate() shall fail if:

     [EINVAL]           The value specified by detachstate is invalid.

     pthread_attr_setschedparam() may fail if:

     [EINVAL]           The value specified by attr is invalid.

     [ENOTSUP]          The value specified by param is invalid.


SEE ALSO

     pthread_create(3), pthread_join(3)


STANDARDS

     pthread_attr_init(), pthread_attr_destroy(),
     pthread_attr_setdetachstate(), pthread_attr_getdetachstate(),
     pthread_attr_setschedparam(), and pthread_attr_getschedparam() conform to
     ISO/IEC 9945-1:1996 (``POSIX.1'').

NetBSD 5.0.2                    March 21, 2007                    NetBSD 5.0.2