Get the stack size and set the stack size of thread attribute in C

Last Updated : 22 Sep, 2017
Prerequisite : Multithreading Syntax : C 
// to get size of stack
int pthread_attr_getstacksize(const pthread_attr_t* restrict attr,
                                          size_t* restrict stacksize);

// to set size of stack
int pthread_attr_setstacksize(pthread_attr_t* attr, size_t stacksize);
. pthread_attr_getstacksize() : It is use for get threads stack size. The stacksize attribute gives the minimum stack size allocated to threads stack. When successfully run then it gives 0 otherwise gives any value. First argument - It takes pthread attribute. Second argument - It takes a variable and give the size of the thread attribute. pthread_attr_setstacksize() : It is use for set new threads stack size. The stacksize attribute gives the minimum stack size allocated to threads stack. When successfully run then it gives 0 otherwise if error gives any value. First argument - It takes pthread attribute. Second argument - It takes the size of new stack (In bytes)
C 
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

int main()
{

    // for takes the size of threads stack
    size_t stksize;

    // attribute declaration
    pthread_attr_t atr;

    // it gets the threads stack size and give 
    // value in stksize variable
    pthread_attr_getstacksize(&atr, &stksize);

    // print the current threads stack size
    printf("Current stack size - > %d\n", stksize);

    // then set the new threads stack size
    pthread_attr_setstacksize(&atr, 320000034);
    pthread_attr_getstacksize(&atr, &stksize);

    // print the new stack size
    printf("New stack size-> %d\n", stksize);
    return 0;
}
Output : 
Current stack size - > 4196464
New stack size-> 320000034
For compile use gcc program_name.c -lpthread
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