/*$PAGE*/
/*
*********************************************************************************************************
*                                          PREVENT SCHEDULING
*                                           给调度器上锁
* Description: This function is used to prevent rescheduling to take place.  This allows your application
*              to prevent context switches until you are ready to permit context switching.
*本函数用于禁止任务调度，直到任务完成后调用给调度器开锁函数OSSchedUnlock()为止。调用OSSchedlock()的任务保持对CPU的控制权，尽管有个优先级更高的任务进入了就绪态。
* Arguments  : none
*
* Returns    : none
*
* Notes      : 1) You MUST invoke OSSchedLock() and OSSchedUnlock() in pair.  In other words, for every
*                 call to OSSchedLock() you MUST have a call to OSSchedUnlock().OSSchedlock()和OSSchedUnlock()必须成对使用。
*********************************************************************************************************
*/#if OS_SCHED_LOCK_EN > 0u                      /*允许生成OS_SCHED_LOCK()函数*/
void  OSSchedLock(void)
{
#if OS_CRITICAL_METHOD == 3u                     /* Allocate storage for CPU status register 给CPU状态寄存器分配存储空间*/OS_CPU_SR  cpu_sr = 0u;                        /*中断号为3*/
#endifif (OSRunning == OS_TRUE) {                  /* Make sure multitasking is running 有多个任务在等待 */OS_ENTER_CRITICAL();                    /*关闭中断*/if (OSIntNesting == 0u) {                /* Can't call from an ISR 没有中断，无法调用中断函数 */if (OSLockNesting < 255u) {          /* Prevent OSLockNesting from wrapping back to 0最大嵌套锁为255u*/OSLockNesting++;                 /* Increment lock nesting level 嵌套锁加1 */}}OS_EXIT_CRITICAL();                      /*开中断*/}
}
#endif/*$PAGE*/
/*
*********************************************************************************************************
*                                          ENABLE SCHEDULING
*                                           给调度器解锁
* Description: This function is used to re-allow rescheduling.
*该功能用来解禁任务调度
* Arguments  : none
*
* Returns    : none
*
* Notes      : 1) You MUST invoke OSSchedLock() and OSSchedUnlock() in pair.  In other words, for every
*                 call to OSSchedLock() you MUST have a call to OSSchedUnlock().
OSSchedlock()和OSSchedUnlock()必须成对使用，在使用OSSchedUnlock()函数之前必须使用OSSchedLock()函数
*********************************************************************************************************
*/#if OS_SCHED_LOCK_EN > 0u                                  /*允许生成OS_SCHED_LOCK()函数*/
void  OSSchedUnlock(void)                                   /*给调度器解锁函数*/
{
#if OS_CRITICAL_METHOD == 3u                               /* Allocate storage for CPU status register */OS_CPU_SR  cpu_sr = 0u;
#endifif (OSRunning == OS_TRUE) {                            /* Make sure multitasking is running有多个任务*/OS_ENTER_CRITICAL();                              /*关闭中断*/if (OSLockNesting > 0u) {                          /* Do not decrement if already 0 嵌套锁大于0*/OSLockNesting--;                               /* Decrement lock nesting level 嵌套锁减1*/if (OSLockNesting == 0u) {                     /* See if scheduler is enabled and ...将嵌套锁减1之后看此时嵌套锁的层数是否为0如果为0，调度管理器可用*/if (OSIntNesting == 0u) {                  /* ... not in an ISR若也没有中断嵌套，则可以进行任务的调度*/OS_EXIT_CRITICAL();                      /*开中断*/OS_Sched();                            /* See if a HPT is ready 进入任务调度*/}else {OS_EXIT_CRITICAL();                       /*退出中断*/}}else {OS_EXIT_CRITICAL();                         /*退出中断*/}}else {OS_EXIT_CRITICAL();                             /*退出中断*/}}
}
#endif