cc -mt [ flag... ] file... -lpthread [ library... ] #include <pthread.h>
int pthread_attr_init(pthread_attr_t *attr);
int pthread_attr_destroy(pthread_attr_t *attr);
The function pthread_attr_init() initializes a thread attributes object attr with the default value for all of the individual attributes used by a given implementation.
The resulting attribute object (possibly modified by setting individual attribute values), when used by pthread_create(), defines the attributes of the thread created. A single attributes object can be used in multiple simultaneous calls to pthread_create().
The pthread_attr_init() function initializes a thread attributes object ( attr) with the default value for each attribute as follows:
| Attribute | Default Value | Meaning of Default |
| contentionscope | PTHREAD_SCOPE_PROCESS | resource competition within process |
| detachstate | PTHREAD_CREATE_JOINABLE | joinable by other threads |
| stackaddr | NULL | stack allocated by system |
| stacksize | NULL | 1 or 2 megabyte |
| priority | 0 | priority of the thread |
| policy | SCHED_OTHER | determined by system |
| inheritsched | PTHREAD_EXPLICIT_SCHED |
scheduling policy and parameters not inherited but explicitly defined by the attribute object
|
| guardsize | PAGESIZE |
size of guard area for a thread's created stack
|
The pthread_attr_destroy() function destroys a thread attributes object ( attr), which cannot be reused until it is reinitialized. An implementation may cause pthread_attr_destroy() to set attr to an implementation-dependent invalid value. The behavior of using the attribute after it has been destroyed is undefined.
Upon successful completion, pthread_attr_init() and pthread_attr_destroy() return a value of 0. Otherwise, an error number is returned to indicate the error.
The pthread_attr_init() function will fail if:
ENOMEM Insufficient memory exists to initialize the thread attributes object.
The pthread_attr_destroy() function may fail if:
EINVAL attr is invalid.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Standard |
| MT-Level | MT-Safe |
sysconf(3C), pthread_attr_getdetachstate(3C), pthread_attr_getguardsize(3C), pthread_attr_getinheritsched(3C), pthread_attr_getschedparam(3C), pthread_attr_getschedpolicy(3C), pthread_attr_getscope(3C), pthread_attr_getstackaddr(3C), pthread_attr_getstacksize(3C), pthread_attr_setdetachstate(3C), pthread_attr_setguardsize(3C), pthread_attr_setinheritsched(3C), pthread_attr_setschedparam(3C), pthread_attr_setschedpolicy(3C), pthread_attr_setscope(3C), pthread_attr_setstackaddr(3C), pthread_attr_setstacksize(3C), pthread_create(3C), attributes(5), standards(5)