Multi-Threading support in c11

Question

The new C11 standard provides a support for Multi-Threading.
My Questions are a bit diversified but definitely answerable.
I have had a look at the C11 n1570

Answer 1

Regarding What compilers provide support for the above mentioned features?

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Pelles C supports C11 . Creation of threads with Pelles C compiler example:

#include 
#include 

#define NUM_THREADS 7

static int threadData[NUM_THREADS];

int threadFunction(void * data) {
    printf("%d-th thread up\n", *(int*)data);
    return 0;
}

int main(void) {
    thrd_t threadId[NUM_THREADS];

    // init thread data
    for (int i=0; i < NUM_THREADS; ++i)
        threadData[i] = i;

    // start NUM_THREADS amount of threads
    for (int i=0; i < NUM_THREADS; ++i) {
        if (thrd_create(threadId+i, threadFunction, threadData+i) != thrd_success) {
            printf("%d-th thread create error\n", i);
            return 0;
        }
    }

    // wait until all threads terminates
    for (int i=0; i < NUM_THREADS; ++i)
        thrd_join(threadId[i], NULL);

    return 0;
}

EDIT: Eliminated thread shared data problem and problem of exiting from main() earlier than all threads terminates.