Function entry

examples/limit.c:44–84

* Entry point. */

 * Entry point.
 */
void entry(const void *addr)
{
    if (mutex_lock(&mutex) < 0)
    {
        if (errno == EOWNERDEAD)
        {
            fputs("thread died with lock\n", stderr);
            abort();
        }
        return;
    }

    // This uses tfind()/tsearch() to track instruction counts.
    // For more information, see the tsearch manpage (man tsearch).
    ENTRY key = {addr, 0}, *entry = NULL;
    void *node = tfind(&key, &TREE, compare);
    if (node == NULL)
    {
        entry = (ENTRY *)malloc(sizeof(ENTRY));
        if (entry == NULL)
        {
error_no_mem:
            fputs("failed to allocate memory\n", stderr);
            abort();
        }
        entry->addr  = addr;
        entry->count = 0;
        node = tsearch(entry, &TREE, compare);
        if (node == NULL)
            goto error_no_mem;
    }
    entry = *(ENTRY **)node;
    entry->count++;
    if (entry->count > limit)
    {
        fprintf(stderr, "limit=%zu reached @ addr=%p\n", limit, addr);
        abort();
    }

    mutex_unlock(&mutex);
}

/*
 * Init.