/**
* @brief Switches to the first thread on the runnable queue.
* @details The current thread is positioned in the ready list ahead of all
* threads having the same priority.
* @note Not a user function, it is meant to be invoked by the scheduler
* itself or from within the port layer.
*
* @special
*/
void chSchDoRescheduleAhead(void) {
thread_t *otp, *cp;
otp = currp;
/* Picks the first thread from the ready queue and makes it current.*/
setcurrp(queue_fifo_remove(&ch.rlist.r_queue));
#if defined(CH_CFG_IDLE_LEAVE_HOOK)
if (otp->p_prio == IDLEPRIO) {
CH_CFG_IDLE_LEAVE_HOOK();
}
#endif
currp->p_state = CH_STATE_CURRENT;
otp->p_state = CH_STATE_READY;
cp = (thread_t *)&ch.rlist.r_queue;
do {
cp = cp->p_next;
} while (cp->p_prio > otp->p_prio);
/* Insertion on p_prev.*/
otp->p_next = cp;
otp->p_prev = cp->p_prev;
otp->p_prev->p_next = cp->p_prev = otp;
chSysSwitch(currp, otp);
}
/**
* @brief Wakes up a thread.
* @details The thread is inserted into the ready list or immediately made
* running depending on its relative priority compared to the current
* thread.
* @pre The thread must not be already inserted in any list through its
* @p p_next and @p p_prev or list corruption would occur.
* @note It is equivalent to a @p chSchReadyI() followed by a
* @p chSchRescheduleS() but much more efficient.
* @note The function assumes that the current thread has the highest
* priority.
*
* @param[in] ntp the thread to be made ready
* @param[in] msg the wakeup message
*
* @sclass
*/
void chSchWakeupS(thread_t *ntp, msg_t msg) {
chDbgCheckClassS();
/* Storing the message to be retrieved by the target thread when it will
restart execution.*/
ntp->p_u.rdymsg = msg;
/* If the waken thread has a not-greater priority than the current
one then it is just inserted in the ready list else it made
running immediately and the invoking thread goes in the ready
list instead.*/
if (ntp->p_prio <= currp->p_prio) {
chSchReadyI(ntp);
}
else {
thread_t *otp = chSchReadyI(currp);
setcurrp(ntp);
#if defined(CH_CFG_IDLE_LEAVE_HOOK)
if (otp->p_prio == IDLEPRIO) {
CH_CFG_IDLE_LEAVE_HOOK();
}
#endif
ntp->p_state = CH_STATE_CURRENT;
chSysSwitch(ntp, otp);
}
}
void chSchDoRescheduleBehind(void) {
Thread *otp;
otp = currp;
/* Picks the first thread from the ready queue and makes it current.*/
setcurrp(fifo_remove(&rlist.r_queue));
currp->p_state = THD_STATE_CURRENT;
otp->p_preempt = CH_TIME_QUANTUM;
chSchReadyI(otp);
chSysSwitch(currp, otp);
}
void chSchGoSleepS(tstate_t newstate) {
Thread *otp;
chDbgCheckClassS();
(otp = currp)->p_state = newstate;
#if CH_TIME_QUANTUM > 0
rlist.r_preempt = CH_TIME_QUANTUM;
#endif
setcurrp(fifo_remove(&rlist.r_queue));
currp->p_state = THD_STATE_CURRENT;
chSysSwitch(currp, otp);
}
void chSchGoSleepS(tstate_t newstate) {
Thread *otp;
chDbgCheckClassS();
(otp = currp)->p_state = newstate;
#if CH_TIME_QUANTUM > 0
/* The thread is renouncing its remaining time slices so it will have a new
time quantum when it will wakeup.*/
otp->p_preempt = CH_TIME_QUANTUM;
#endif
setcurrp(fifo_remove(&rlist.r_queue));
currp->p_state = THD_STATE_CURRENT;
chSysSwitch(currp, otp);
}
void chSchWakeupS(Thread *ntp, msg_t msg) {
chDbgCheckClassS();
ntp->p_u.rdymsg = msg;
/* If the waken thread has a not-greater priority than the current
one then it is just inserted in the ready list else it made
running immediately and the invoking thread goes in the ready
list instead.*/
if (ntp->p_prio <= currp->p_prio)
chSchReadyI(ntp);
else {
Thread *otp = chSchReadyI(currp);
setcurrp(ntp);
ntp->p_state = THD_STATE_CURRENT;
chSysSwitch(ntp, otp);
}
}
/**
* @brief Switches to the first thread on the runnable queue.
* @details The current thread is positioned in the ready list behind all
* threads having the same priority. The thread regains its time
* quantum.
* @note Not a user function, it is meant to be invoked by the scheduler
* itself or from within the port layer.
*
* @special
*/
void chSchDoRescheduleBehind(void) {
thread_t *otp;
otp = currp;
/* Picks the first thread from the ready queue and makes it current.*/
setcurrp(queue_fifo_remove(&ch.rlist.r_queue));
#if defined(CH_CFG_IDLE_LEAVE_HOOK)
if (otp->p_prio == IDLEPRIO) {
CH_CFG_IDLE_LEAVE_HOOK();
}
#endif
currp->p_state = CH_STATE_CURRENT;
#if CH_CFG_TIME_QUANTUM > 0
otp->p_preempt = CH_CFG_TIME_QUANTUM;
#endif
chSchReadyI(otp);
chSysSwitch(currp, otp);
}
void chSchDoRescheduleAhead(void) {
Thread *otp, *cp;
otp = currp;
/* Picks the first thread from the ready queue and makes it current.*/
setcurrp(fifo_remove(&rlist.r_queue));
currp->p_state = THD_STATE_CURRENT;
otp->p_state = THD_STATE_READY;
cp = (Thread *)&rlist.r_queue;
do {
cp = cp->p_next;
} while (cp->p_prio > otp->p_prio);
/* Insertion on p_prev.*/
otp->p_next = cp;
otp->p_prev = cp->p_prev;
otp->p_prev->p_next = cp->p_prev = otp;
chSysSwitch(currp, otp);
}
/**
* @brief Puts the current thread to sleep into the specified state.
* @details The thread goes into a sleeping state. The possible
* @ref thread_states are defined into @p threads.h.
*
* @param[in] newstate the new thread state
*
* @sclass
*/
void chSchGoSleepS(tstate_t newstate) {
thread_t *otp;
chDbgCheckClassS();
(otp = currp)->p_state = newstate;
#if CH_CFG_TIME_QUANTUM > 0
/* The thread is renouncing its remaining time slices so it will have a new
time quantum when it will wakeup.*/
otp->p_preempt = CH_CFG_TIME_QUANTUM;
#endif
setcurrp(queue_fifo_remove(&ch.rlist.r_queue));
#if defined(CH_CFG_IDLE_ENTER_HOOK)
if (currp->p_prio == IDLEPRIO) {
CH_CFG_IDLE_ENTER_HOOK();
}
#endif
currp->p_state = CH_STATE_CURRENT;
chSysSwitch(currp, otp);
}
