osiii中OS_CRITICAL_ENTER和CPU_CRITICAL_ENTER关系

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osiii的系统函数中的临界代码有的用CPU_CRITICAL_ENTER();

有的用OS_CRITICAL_ENTER();

CPU_CRITICAL_ENTER是真的关掉中断而OS_CRITICAL_ENTER()

要看#define OS_CFG_ISR_POST_DEFERRED_EN 这个选项

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#if OS_CFG_ISR_POST_DEFERRED_EN > 0u /* Deferred ISR Posts ------------------------------ */
/* Lock the scheduler */
#define OS_CRITICAL_ENTER() \
do { \
CPU_CRITICAL_ENTER(); \
OSSchedLockNestingCtr++; \
if (OSSchedLockNestingCtr == 1u) { \
OS_SCHED_LOCK_TIME_MEAS_START(); \
} \
CPU_CRITICAL_EXIT(); \
} while (0)
/* Lock the scheduler but re-enable interrupts */
#define OS_CRITICAL_ENTER_CPU_EXIT() \
do { \
OSSchedLockNestingCtr++; \
\
if (OSSchedLockNestingCtr == 1u) { \
OS_SCHED_LOCK_TIME_MEAS_START(); \
} \
CPU_CRITICAL_EXIT(); \
} while (0)

/* Scheduling occurs only if an interrupt occurs */
#define OS_CRITICAL_EXIT() \
do { \
CPU_CRITICAL_ENTER(); \
OSSchedLockNestingCtr--; \
if (OSSchedLockNestingCtr == (OS_NESTING_CTR)0) { \
OS_SCHED_LOCK_TIME_MEAS_STOP(); \
if (OSIntQNbrEntries > (OS_OBJ_QTY)0) { \
CPU_CRITICAL_EXIT(); \
OS_Sched0(); \
} else { \
CPU_CRITICAL_EXIT(); \
} \
} else { \
CPU_CRITICAL_EXIT(); \
} \
} while (0)

#define OS_CRITICAL_EXIT_NO_SCHED() \
do { \
CPU_CRITICAL_ENTER(); \
OSSchedLockNestingCtr--; \
if (OSSchedLockNestingCtr == (OS_NESTING_CTR)0) { \
OS_SCHED_LOCK_TIME_MEAS_STOP(); \
} \
CPU_CRITICAL_EXIT(); \
} while (0)

#else /* Direct ISR Posts -------------------------------- */

#define OS_CRITICAL_ENTER() CPU_CRITICAL_ENTER()

#define OS_CRITICAL_ENTER_CPU_EXIT()

#define OS_CRITICAL_EXIT() CPU_CRITICAL_EXIT()

#define OS_CRITICAL_EXIT_NO_SCHED() CPU_CRITICAL_EXIT()

#endif

-------------------------------------------------------------------

void OS_CPU_SysTickHandler (void)
{
CPU_SR_ALLOC();
CPU_CRITICAL_ENTER();
OSIntNestingCtr++; /* Tell uC/OS-III that we are starting an ISR */
CPU_CRITICAL_EXIT();
OSTimeTick(); /* Call uC/OS-III's OSTimeTick() */
OSIntExit(); /* Tell uC/OS-III that we are leaving the ISR */
} 这里用的是CPU_CRITICAL_ENTER()真的关掉中断了

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在直接提交方式中，uC/OS-III 访问临界段时关中断。然而，在延
迟提交方式中，uC/OS-III 访问临界段时锁调度器。
在延迟提交方式中，访问中断队列时 uC/OS-III 还是需要关中断。然而，
这段关中断时间是非常短的且是相当固定的。

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