source: tools/busy.c @ 2c39855

#include <stdbool.h>
#include <stdlib.h>
#include <pthread.h>

struct S {
        int i, j, k, l, m, n;
};

void * CallingMalloc( void * arg __attribute__((unused)) ) {
        for ( volatile int i = 0; i < 10000; i += 1 ) {
                volatile int      * ip  = (volatile int      *)malloc( sizeof(   int  ) *   1 );
                volatile int      * aip = (volatile int      *)malloc( sizeof(   int  ) * 100 );
                volatile struct S * sp  = (volatile struct S *)malloc( sizeof(struct S) * 200 );

                sp->i = 0;
                sp->j = 1;
                sp->k = 2;
                sp->l = 3;
                sp->m = 4;
                sp->n = 5;
                for(int j = 0; j < 100; j++) {
                        aip[j] = j;
                }
                *ip = i;

                free( (void*)sp );
                free( (void*)aip );
                free( (void*)ip );
        }
        return NULL;
}

int main() {
    while(true) {
            pthread_t t[15];
            for(int i = 0; i < 15; i++) {
                    pthread_create( &t[i], NULL, CallingMalloc, NULL );
            }

            for(int i = 0; i < 15; i++) {
                    pthread_join( t[i], NULL );
            }
    }
}