void _k_thread_single_start(struct k_thread *thread)
{
_mark_thread_as_started(thread);
if (_is_thread_ready(thread)) {
_add_thread_to_ready_q(thread);
}
}
static void start_thread(struct k_thread *thread)
{
int key = irq_lock(); /* protect kernel queues */
_mark_thread_as_started(thread);
if (_is_thread_ready(thread)) {
_add_thread_to_ready_q(thread);
if (_must_switch_threads()) {
_Swap(key);
return;
}
}
irq_unlock(key);
}
/**
*
* @brief Initializes kernel data structures
*
* This routine initializes various kernel data structures, including
* the init and idle threads and any architecture-specific initialization.
*
* Note that all fields of "_kernel" are set to zero on entry, which may
* be all the initialization many of them require.
*
* @return N/A
*/
static void prepare_multithreading(struct k_thread *dummy_thread)
{
#ifdef CONFIG_ARCH_HAS_CUSTOM_SWAP_TO_MAIN
ARG_UNUSED(dummy_thread);
#else
/*
* Initialize the current execution thread to permit a level of
* debugging output if an exception should happen during kernel
* initialization. However, don't waste effort initializing the
* fields of the dummy thread beyond those needed to identify it as a
* dummy thread.
*/
_current = dummy_thread;
dummy_thread->base.user_options = K_ESSENTIAL;
dummy_thread->base.thread_state = _THREAD_DUMMY;
#endif
/* _kernel.ready_q is all zeroes */
/*
* The interrupt library needs to be initialized early since a series
* of handlers are installed into the interrupt table to catch
* spurious interrupts. This must be performed before other kernel
* subsystems install bonafide handlers, or before hardware device
* drivers are initialized.
*/
_IntLibInit();
/* ready the init/main and idle threads */
for (int ii = 0; ii < K_NUM_PRIORITIES; ii++) {
sys_dlist_init(&_ready_q.q[ii]);
}
/*
* prime the cache with the main thread since:
*
* - the cache can never be NULL
* - the main thread will be the one to run first
* - no other thread is initialized yet and thus their priority fields
* contain garbage, which would prevent the cache loading algorithm
* to work as intended
*/
_ready_q.cache = _main_thread;
_new_thread(_main_thread, _main_stack,
MAIN_STACK_SIZE, _main, NULL, NULL, NULL,
CONFIG_MAIN_THREAD_PRIORITY, K_ESSENTIAL);
_mark_thread_as_started(_main_thread);
_add_thread_to_ready_q(_main_thread);
#ifdef CONFIG_MULTITHREADING
_new_thread(_idle_thread, _idle_stack,
IDLE_STACK_SIZE, idle, NULL, NULL, NULL,
K_LOWEST_THREAD_PRIO, K_ESSENTIAL);
_mark_thread_as_started(_idle_thread);
_add_thread_to_ready_q(_idle_thread);
#endif
initialize_timeouts();
/* perform any architecture-specific initialization */
kernel_arch_init();
}
