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

Attribute	Value	Result
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 Solaris time-sharing (TS) scheduling class.
guardsize	PAGESIZE	Stack overflow protection.

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Note –

The default value for the inheritsched attribute might change from PTHREAD_EXPLICIT_SCHED to PTHREAD_INHERIT_SCHED in a future 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.

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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.