diff options
Diffstat (limited to 'src/chschd.c')
| -rw-r--r-- | src/chschd.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/src/chschd.c b/src/chschd.c index c3e0fbaed..c97eea1e8 100644 --- a/src/chschd.c +++ b/src/chschd.c @@ -146,20 +146,21 @@ msg_t chSchGoSleepTimeoutS(tstate_t newstate, systime_t time) { */ void chSchWakeupS(Thread *ntp, msg_t msg) { ntp->p_rdymsg = msg; - /* the woken thread has equal or lower priority than the running thread? */ if (ntp->p_prio <= currp->p_prio) - /* put the woken thread on the ready queue */ + /* the woken thread has equal or lower priority than the running thread */ chSchReadyI(ntp); - /* the woken thread has higher priority than the running thread */ else { - /* put the running thread on the ready queue */ + /* the woken thread has higher priority than the running thread and thus + * preempts the currently running thread. */ Thread *otp = currp; chSchReadyI(otp); + /* change the to-be-run thread to running state */ (currp = ntp)->p_state = PRCURR; #ifdef CH_USE_ROUNDROBIN rlist.r_preempt = CH_TIME_QUANTUM; #endif #ifdef CH_USE_TRACE + /* trace the context switch */ chDbgTrace(otp, ntp); #endif /* switch the thread context */ |