Initializing Attributes
Use pthread_attr_init(3C) to initialize object attributes to their default values.
The storage is allocated by the thread system during execution.
pthread_attr_init Syntax
int pthread_attr_init(pthread_attr_t *tattr);
#include <pthread.h>
pthread_attr_t tattr;
int ret;
/* initialize an attribute to the default value */
ret = pthread_attr_init(&tattr);
Table 3–1 shows the default values
for attributes (tattr).
Table 3-1 Default Attribute Values for tattr
| | |
|---|
scope
| PTHREAD_SCOPE_PROCESS
| New thread contends with other threads in the process.
|
detachstate
| PTHREAD_CREATE_JOINABLE
| Completion status and thread ID are preserved
after the thread exits.
|
stackaddr
| NULL
| New thread has system-allocated stack address.
|
stacksize
| 0
| New thread has system-defined stack size.
|
priority
| 0
| New thread has priority 0.
|
inheritsched
| PTHREAD_EXPLICIT_SCHED
| New thread does not inherit parent thread scheduling priority.
|
schedpolicy
| SCHED_OTHER
| New thread uses the traditional
Oracle Solaris time-sharing (TS) scheduling
class.
|
guardsize
| PAGESIZE
| Stack overflow protection.
|
|
Note - The default value for the inheritsched attribute
might change from PTHREAD_EXPLICIT_SCHED to PTHREAD_INHERIT_SCHED in a future Oracle
Solaris release. You should call pthread_attr_setinheritsched() to set the inheritsched attribute to
the value you want rather than accepting the default, in order to avoid any
potential problems caused by this change.
pthread_attr_init Return Values
pthread_attr_init() returns
zero after completing successfully. Any other return value indicates that
an error occurred. If the following condition occurs, the function fails and
returns the corresponding value.
ENOMEM
Description: Returned when not enough memory is allocated
to initialize the thread attributes object.