Function pthread_create

components/libc/posix/pthreads/pthread.c:388–506

* @brief Creates a new thread in a POSIX-compliant system. * * The `pthread_create` function initializes a new thread in the calling process. The new thread starts execution * by invoking the function specified by the `start` parameter. The thread runs concurrently with the calling thread. * * @param[out] pid * A pointer to a `pthread_t` object where the ID of the newly created thread will

 * @see pthread_join, pthread_exit, pthread_attr_init
 */
int pthread_create(pthread_t            *pid,
                   const pthread_attr_t *attr,
                   void *(*start)(void *), void *parameter)
{
    int ret = 0;
    void *stack;
    char name[RT_NAME_MAX];
    static rt_uint16_t pthread_number = 0;

    pthread_t pth_id;
    _pthread_data_t *ptd;

    /* pid shall be provided */
    RT_ASSERT(pid != RT_NULL);

    /* allocate posix thread data */
    pth_id = _pthread_data_create();
    if (pth_id == PTHREAD_NUM_MAX)
    {
        ret = ENOMEM;
        goto __exit;
    }
    /* get pthread data */
    ptd = _pthread_get_data(pth_id);

    RT_ASSERT(ptd != RT_NULL);

    if (attr != RT_NULL)
    {
        ptd->attr = *attr;
    }
    else
    {
        /* use default attribute */
        pthread_attr_init(&ptd->attr);
    }

    if (ptd->attr.stacksize == 0)
    {
        ret = EINVAL;
        goto __exit;
    }

    rt_snprintf(name, sizeof(name), "pth%02d", pthread_number ++);

    /* pthread is a static thread object */
    ptd->tid = (rt_thread_t) rt_malloc(sizeof(struct rt_thread));
    if (ptd->tid == RT_NULL)
    {
        ret = ENOMEM;
        goto __exit;
    }
    memset(ptd->tid, 0, sizeof(struct rt_thread));

    if (ptd->attr.detachstate == PTHREAD_CREATE_JOINABLE)
    {
        ptd->joinable_sem = rt_sem_create(name, 0, RT_IPC_FLAG_FIFO);
        if (ptd->joinable_sem == RT_NULL)