GCC __transaction_atomic bomb

transaction_bomb.c

/* It will eat your memory 
* But if you insist, compile it with:

gcc -pthread -fgnu-tm  -mcx16 -o transaction_bomb transaction_bomb.c

*/

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>

#define ARRAY_SIZE 2
#define NUM_THREADS 2
#define MAX_COUNT 100000000

// Just used to send the index of the id
struct tdata {
    int tid;
};

int counter[ARRAY_SIZE];

void *count(void *ptr) {
    long i, max = MAX_COUNT/NUM_THREADS;
    int tid = ((struct tdata *) ptr)->tid;

    __transaction_atomic {
        while (!counter[tid]);
        counter[(tid + 1) % NUM_THREADS] = 1;
    }
    return;

}

int main (int argc, char *argv[]) {
    pthread_t threads[NUM_THREADS];
    int rc, i;
    struct tdata id[NUM_THREADS];

    for(i=0; i<NUM_THREADS; i++){
        id[i].tid = i;
        rc = pthread_create(&threads[i], NULL, count, (void *) &id[i]);
    }

    for(i=0; i<NUM_THREADS; i++){
        pthread_join(threads[i], NULL);
    }

    return 0;
}