Function sys_thread_create

components/lwp/lwp_syscall.c:3238–3332

* @brief Creates a new thread. * * This system call creates a new thread within the calling process. The newly created * thread starts executing the function specified by the `arg` argument, which typically * contains the necessary arguments or function pointer for the thread's execution. * * @param[in] arg An array of arguments that will be passed to the function executed *

 *          are unavailable.
 */
rt_thread_t sys_thread_create(void *arg[])
{
    void *user_stack = 0;
    struct rt_lwp *lwp = 0;
    rt_thread_t thread = RT_NULL;
    int tid = 0;

    lwp = rt_thread_self()->lwp;
    lwp_ref_inc(lwp);
#ifdef ARCH_MM_MMU
    user_stack = lwp_map_user(lwp, 0, (size_t)arg[3], 0);
    if (!user_stack)
    {
        goto fail;
    }
    if ((tid = lwp_tid_get()) == 0)
    {
        goto fail;
    }
    thread = rt_thread_create((const char *)arg[0],
            _crt_thread_entry,
            (void *)arg[2],
            ALLOC_KERNEL_STACK_SIZE,
            (rt_uint8_t)(size_t)arg[4],
            (rt_uint32_t)(rt_size_t)arg[5]);
    if (!thread)
    {
        goto fail;
    }

#ifdef RT_USING_SMP
    RT_SCHED_CTX(thread).bind_cpu = lwp->bind_cpu;
#endif
    thread->cleanup = lwp_cleanup;
    thread->user_entry = (void (*)(void *))arg[1];
    thread->user_stack = (void *)user_stack;
    thread->user_stack_size = (rt_size_t)arg[3];
#else
    rt_uint32_t kstack_size = (rt_uint32_t)arg[7];
    if (kstack_size < ALLOC_KERNEL_STACK_SIZE_MIN)
    {
        /* When kstack size is 0, the default size of the kernel stack is used */
        kstack_size = kstack_size ? ALLOC_KERNEL_STACK_SIZE_MIN : ALLOC_KERNEL_STACK_SIZE;
    }
    else if (kstack_size > ALLOC_KERNEL_STACK_SIZE_MAX)
    {
        kstack_size = ALLOC_KERNEL_STACK_SIZE_MAX;
    }

    user_stack  = (void *)arg[3];
    if ((!user_stack) || ((rt_uint32_t)arg[6] == RT_NULL))
    {
        goto fail;
    }

    if ((tid = lwp_tid_get()) == 0)
    {
        goto fail;