248 lines
6.2 KiB
C
248 lines
6.2 KiB
C
/*
|
|
* Copyright (c) 2016-2017 Wind River Systems, Inc.
|
|
* Copyright (c) 2024 Intel Corporation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#ifndef ZEPHYR_KERNEL_INCLUDE_THREAD_H_
|
|
#define ZEPHYR_KERNEL_INCLUDE_THREAD_H_
|
|
|
|
#include <zephyr/kernel.h>
|
|
#include <kernel_internal.h>
|
|
#include <timeout_q.h>
|
|
|
|
|
|
#define Z_STATE_STR_DUMMY "dummy"
|
|
#define Z_STATE_STR_PENDING "pending"
|
|
#define Z_STATE_STR_PRESTART "prestart"
|
|
#define Z_STATE_STR_DEAD "dead"
|
|
#define Z_STATE_STR_SUSPENDED "suspended"
|
|
#define Z_STATE_STR_ABORTING "aborting"
|
|
#define Z_STATE_STR_SUSPENDING "suspending"
|
|
#define Z_STATE_STR_QUEUED "queued"
|
|
|
|
#ifdef CONFIG_THREAD_MONITOR
|
|
/* This lock protects the linked list of active threads; i.e. the
|
|
* initial _kernel.threads pointer and the linked list made up of
|
|
* thread->next_thread (until NULL)
|
|
*/
|
|
extern struct k_spinlock z_thread_monitor_lock;
|
|
#endif /* CONFIG_THREAD_MONITOR */
|
|
|
|
void idle(void *unused1, void *unused2, void *unused3);
|
|
|
|
/* clean up when a thread is aborted */
|
|
|
|
#if defined(CONFIG_THREAD_MONITOR)
|
|
void z_thread_monitor_exit(struct k_thread *thread);
|
|
#else
|
|
#define z_thread_monitor_exit(thread) \
|
|
do {/* nothing */ \
|
|
} while (false)
|
|
#endif /* CONFIG_THREAD_MONITOR */
|
|
|
|
|
|
static inline void thread_schedule_new(struct k_thread *thread, k_timeout_t delay)
|
|
{
|
|
#ifdef CONFIG_SYS_CLOCK_EXISTS
|
|
if (K_TIMEOUT_EQ(delay, K_NO_WAIT)) {
|
|
k_thread_start(thread);
|
|
} else {
|
|
z_add_thread_timeout(thread, delay);
|
|
}
|
|
#else
|
|
ARG_UNUSED(delay);
|
|
k_thread_start(thread);
|
|
#endif /* CONFIG_SYS_CLOCK_EXISTS */
|
|
}
|
|
|
|
static inline int thread_is_preemptible(struct k_thread *thread)
|
|
{
|
|
/* explanation in kernel_struct.h */
|
|
return thread->base.preempt <= _PREEMPT_THRESHOLD;
|
|
}
|
|
|
|
|
|
static inline int thread_is_metairq(struct k_thread *thread)
|
|
{
|
|
#if CONFIG_NUM_METAIRQ_PRIORITIES > 0
|
|
return (thread->base.prio - K_HIGHEST_THREAD_PRIO)
|
|
< CONFIG_NUM_METAIRQ_PRIORITIES;
|
|
#else
|
|
ARG_UNUSED(thread);
|
|
return 0;
|
|
#endif /* CONFIG_NUM_METAIRQ_PRIORITIES */
|
|
}
|
|
|
|
#if CONFIG_ASSERT
|
|
static inline bool is_thread_dummy(struct k_thread *thread)
|
|
{
|
|
return (thread->base.thread_state & _THREAD_DUMMY) != 0U;
|
|
}
|
|
#endif /* CONFIG_ASSERT */
|
|
|
|
|
|
static inline bool z_is_thread_suspended(struct k_thread *thread)
|
|
{
|
|
return (thread->base.thread_state & _THREAD_SUSPENDED) != 0U;
|
|
}
|
|
|
|
static inline bool z_is_thread_pending(struct k_thread *thread)
|
|
{
|
|
return (thread->base.thread_state & _THREAD_PENDING) != 0U;
|
|
}
|
|
|
|
static inline bool z_is_thread_prevented_from_running(struct k_thread *thread)
|
|
{
|
|
uint8_t state = thread->base.thread_state;
|
|
|
|
return (state & (_THREAD_PENDING | _THREAD_PRESTART | _THREAD_DEAD |
|
|
_THREAD_DUMMY | _THREAD_SUSPENDED)) != 0U;
|
|
|
|
}
|
|
|
|
static inline bool z_is_thread_timeout_active(struct k_thread *thread)
|
|
{
|
|
return !z_is_inactive_timeout(&thread->base.timeout);
|
|
}
|
|
|
|
static inline bool z_is_thread_ready(struct k_thread *thread)
|
|
{
|
|
return !((z_is_thread_prevented_from_running(thread)) != 0U ||
|
|
z_is_thread_timeout_active(thread));
|
|
}
|
|
|
|
static inline bool z_has_thread_started(struct k_thread *thread)
|
|
{
|
|
return (thread->base.thread_state & _THREAD_PRESTART) == 0U;
|
|
}
|
|
|
|
static inline bool z_is_thread_state_set(struct k_thread *thread, uint32_t state)
|
|
{
|
|
return (thread->base.thread_state & state) != 0U;
|
|
}
|
|
|
|
static inline bool z_is_thread_queued(struct k_thread *thread)
|
|
{
|
|
return z_is_thread_state_set(thread, _THREAD_QUEUED);
|
|
}
|
|
|
|
static inline void z_mark_thread_as_suspended(struct k_thread *thread)
|
|
{
|
|
thread->base.thread_state |= _THREAD_SUSPENDED;
|
|
|
|
SYS_PORT_TRACING_FUNC(k_thread, sched_suspend, thread);
|
|
}
|
|
|
|
static inline void z_mark_thread_as_not_suspended(struct k_thread *thread)
|
|
{
|
|
thread->base.thread_state &= ~_THREAD_SUSPENDED;
|
|
|
|
SYS_PORT_TRACING_FUNC(k_thread, sched_resume, thread);
|
|
}
|
|
|
|
static inline void z_mark_thread_as_started(struct k_thread *thread)
|
|
{
|
|
thread->base.thread_state &= ~_THREAD_PRESTART;
|
|
}
|
|
|
|
static inline void z_mark_thread_as_pending(struct k_thread *thread)
|
|
{
|
|
thread->base.thread_state |= _THREAD_PENDING;
|
|
}
|
|
|
|
static inline void z_mark_thread_as_not_pending(struct k_thread *thread)
|
|
{
|
|
thread->base.thread_state &= ~_THREAD_PENDING;
|
|
}
|
|
|
|
/*
|
|
* This function tags the current thread as essential to system operation.
|
|
* Exceptions raised by this thread will be treated as a fatal system error.
|
|
*/
|
|
static inline void z_thread_essential_set(struct k_thread *thread)
|
|
{
|
|
thread->base.user_options |= K_ESSENTIAL;
|
|
}
|
|
|
|
/*
|
|
* This function tags the current thread as not essential to system operation.
|
|
* Exceptions raised by this thread may be recoverable.
|
|
* (This is the default tag for a thread.)
|
|
*/
|
|
static inline void z_thread_essential_clear(struct k_thread *thread)
|
|
{
|
|
thread->base.user_options &= ~K_ESSENTIAL;
|
|
}
|
|
|
|
/*
|
|
* This routine indicates if the current thread is an essential system thread.
|
|
*
|
|
* Returns true if current thread is essential, false if it is not.
|
|
*/
|
|
static inline bool z_is_thread_essential(struct k_thread *thread)
|
|
{
|
|
return (thread->base.user_options & K_ESSENTIAL) == K_ESSENTIAL;
|
|
}
|
|
|
|
|
|
static ALWAYS_INLINE bool should_preempt(struct k_thread *thread,
|
|
int preempt_ok)
|
|
{
|
|
/* Preemption is OK if it's being explicitly allowed by
|
|
* software state (e.g. the thread called k_yield())
|
|
*/
|
|
if (preempt_ok != 0) {
|
|
return true;
|
|
}
|
|
|
|
__ASSERT(_current != NULL, "");
|
|
|
|
/* Or if we're pended/suspended/dummy (duh) */
|
|
if (z_is_thread_prevented_from_running(_current)) {
|
|
return true;
|
|
}
|
|
|
|
/* Edge case on ARM where a thread can be pended out of an
|
|
* interrupt handler before the "synchronous" swap starts
|
|
* context switching. Platforms with atomic swap can never
|
|
* hit this.
|
|
*/
|
|
if (IS_ENABLED(CONFIG_SWAP_NONATOMIC)
|
|
&& z_is_thread_timeout_active(thread)) {
|
|
return true;
|
|
}
|
|
|
|
/* Otherwise we have to be running a preemptible thread or
|
|
* switching to a metairq
|
|
*/
|
|
if (thread_is_preemptible(_current) || thread_is_metairq(thread)) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
|
|
static inline bool z_is_idle_thread_entry(void *entry_point)
|
|
{
|
|
return entry_point == idle;
|
|
}
|
|
|
|
static inline bool z_is_idle_thread_object(struct k_thread *thread)
|
|
{
|
|
#ifdef CONFIG_MULTITHREADING
|
|
#ifdef CONFIG_SMP
|
|
return thread->base.is_idle;
|
|
#else
|
|
return thread == &z_idle_threads[0];
|
|
#endif /* CONFIG_SMP */
|
|
#else
|
|
return false;
|
|
#endif /* CONFIG_MULTITHREADING */
|
|
}
|
|
|
|
|
|
#endif /* ZEPHYR_KERNEL_INCLUDE_THREAD_H_ */
|