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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 0 1 or 2 megabyte |
| priority 0 priority of the thread |
| policy SCHED_OTHER traditional time-sharing policy |
| inheritsched PTHREAD_INHERIT_SCHED |
| scheduling policy and parameters are inherited from the creating thread |
| 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 Committed |
| MT-Level MT-Safe |
| Standard See standards(5). |
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)