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Chapter 4
#define
OS_CRITICAL_ENTER()
{
CPU_CRITICAL_ENTER();
OSSchedLockNestingCtr++;
CPU_CRITICAL_EXIT();
}
#define
#define
OS_CRITICAL_EXIT()
OS_CRITICAL_EXIT_NO_SCHED()
{
}
{
CPU_CRITICAL_ENTER();
OSSchedLockNestingCtr--;
if (OSSchedLockNestingCtr == (OS_NESTING_CTR)0) {
CPU_CRITICAL_EXIT();
OSSched();
} else {
CPU_CRITICAL_EXIT();
}
CPU_CRITICAL_ENTER();
OSSchedLockNestingCtr--;
CPU_CRITICAL_EXIT();
}
Listing 4-2 Critical section code – Locking the Scheduler
4-2-1 MEASURING SCHEDULER LOCK TIME
μC/OS-III provides facilities to measure the amount of time the scheduler is locked. This is done
by setting the configuration constant OS_CFG_SCHED_LOCK_TIME_MEAS_EN to 1 in OS_CFG.H .
The measurement is started each time the scheduler is locked and ends when the scheduler
is unlocked. The measurement keeps track of two values: a global scheduler lock time, and
a per-task scheduler lock time. It is therefore possible to know how long each task locks the
scheduler allowing the user to better optimize code.
The per-task scheduler lock time is saved in the task’s OS_TCB during a context switch (see
OSTaskSwHook() in OS_CPU_C.C and described in Chapter 8, “Context Switching” on
page 147).
The unit of measure for the measured time is in CPU_TS (timestamp) units so it is necessary to
find the resolution of the timer used to measure the timestamps. For example, if the timer used
for the timestamp is incremented at 1 MHz then the resolution of CPU_TS is 1 microsecond.
72
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