Setting the Stack Size

pthread_attr_setstacksize(3C) sets the thread stack size.

pthread_attr_setstacksize Syntax

int pthread_attr_setstacksize(pthread_attr_t *tattr, size_t size);

#include <pthread.h> 
#include <limits.h>
pthread_attr_t tattr; 
size_t size; 
int ret; 
size = (PTHREAD_STACK_MIN + 0x4000); 
/* setting a new size */ 
ret = pthread_attr_setstacksize(&tattr, size);

The size attribute defines the size of the stack (in bytes) that the system allocates. The size should not be less than the system-defined minimum stack size. See About Stacks for more information.

size contains the number of bytes for the stack that the new thread uses. If size is zero, a default size is used. In most cases, a zero value works best.

PTHREAD_STACK_MIN is the amount of stack space that is required to start a thread. This stack space does not take into consideration the threads routine requirements that are needed to execute application code.

Example 3–3 Example of Setting Stack Size

#include <pthread.h>
#include <limits.h>

pthread_attr_t tattr;
pthread_t tid;
int ret;

size_t size = PTHREAD_STACK_MIN + 0x4000;

/* initialized with default attributes */
ret = pthread_attr_init(&tattr);

/* setting the size of the stack also */
ret = pthread_attr_setstacksize(&tattr, size);

/* only size specified in tattr*/
ret = pthread_create(&tid, &tattr, start_routine, arg); 

pthread_attr_setstacksize Return Values

pthread_attr_setstacksize() 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.

EINVAL

Description:

The value of size is less than PTHREAD_STACK_MIN, or exceeds a system-imposed limit, or tattr is not valid.