arcshift 0.4.2

Replacement for std::sync::Arc<T> that supports updating the value, with some caveats.
Documentation 
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/* file: mp.c */
#include <stdlib.h>
#include <pthread.h>
#include <stdatomic.h>
#include <stdbool.h>
#include <assert.h>

atomic_int x;
atomic_int y;

void *thread_1(void *unused)
{
    int yval = atomic_load_explicit(&y, memory_order_acquire);
    atomic_store_explicit(&x, yval, memory_order_release);
    return NULL;
}

void *thread_2(void *unused)
{
    int a = atomic_load_explicit(&x, memory_order_relaxed);
    atomic_store_explicit(&y, 1, memory_order_relaxed);
    assert(a != 1);
    return NULL;
}


int main()
{
    pthread_t t1, t2;

    if (pthread_create(&t1, NULL, thread_1, NULL))
            abort();
    if (pthread_create(&t2, NULL, thread_2, NULL))
            abort();

    return 0;
}