ucos源代码

/* ********************************************************************************************************* * uC/OS-II * The Real-Time Kernel * CORE FUNCTIONS * * (c) Copyright 1992-1998, Jean J. Labrosse, Plantation, FL * All Rights Reserved * * V2.00 * * File : OS_CORE.C * By : Jean J. Labrosse ********************************************************************************************************* */ #ifndef OS_MASTER_FILE #define OS_GLOBALS #include "includes.h" #endif /* ********************************************************************************************************* * LOCAL GLOBAL VARIABLES ********************************************************************************************************* */ static INT8U OSIntExitY; /* Variable used by 'OSIntExit' to prevent using locals */ static OS_STK OSTaskIdleStk[OS_TASK_IDLE_STK_SIZE]; /* Idle task stack */ #if OS_TASK_STAT_EN static OS_STK OSTaskStatStk[OS_TASK_STAT_STK_SIZE]; /* Statistics task stack */ #endif static OS_TCB OSTCBTbl[OS_MAX_TASKS + OS_N_SYS_TASKS]; /* Table of TCBs */ /*$PAGE*/ /* ********************************************************************************************************* * MAPPING TABLE TO MAP BIT POSITION TO BIT MASK * * Note: Index into table is desired bit position, 0..7 * Indexed value corresponds to bit mask ********************************************************************************************************* */ INT8U const OSMapTbl[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80}; /* ********************************************************************************************************* * PRIORITY RESOLUTION TABLE * * Note: Index into table is bit pattern to resolve highest priority * Indexed value corresponds to highest priority bit position (i.e. 0..7) ********************************************************************************************************* */ INT8U const OSUnMapTbl[] = { 0, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 7, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 6, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 5, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0, 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0 }; /*$PAGE*/ /* ********************************************************************************************************* * MAKE TASK READY TO RUN BASED ON EVENT OCCURING * * Description: This function is called by other uC/OS-II services and is used to ready a task that was * waiting for an event to occur. * * Arguments : pevent is a pointer to the event control block corresponding to the event. * * msg is a pointer to a message. This pointer is used by message oriented services * such as MAILBOXEs and QUEUEs. The pointer is not used when called by other * service functions. * * msk is a mask that is used to clear the status byte of the TCB. For example, * OSSemPost() will pass OS_STAT_SEM, OSMboxPost() will pass OS_STAT_MBOX etc. * * Returns : none * * Note : This function is INTERNAL to uC/OS-II and your application should not call it. ********************************************************************************************************* */ #if (OS_Q_EN && (OS_MAX_QS >= 2)) || OS_MBOX_EN || OS_SEM_EN void OSEventTaskRdy (OS_EVENT *pevent, void *msg, INT8U msk) { OS_TCB *ptcb; INT8U x; INT8U y; INT8U bitx; INT8U bity; INT8U prio; y = OSUnMapTbl[pevent->OSEventGrp]; /* Find highest prio. task waiting for message */ bity = OSMapTbl[y]; x = OSUnMapTbl[pevent->OSEventTbl[y]]; bitx = OSMapTbl[x]; prio = (INT8U)((y << 3) + x); /* Find priority of task getting the msg */ if ((pevent->OSEventTbl[y] &= ~bitx) == 0) { /* Remove this task from the waiting list */ pevent->OSEventGrp &= ~bity; } ptcb = OSTCBPrioTbl[prio]; /* Point to this task's OS_TCB */ ptcb->OSTCBDly = 0; /* Prevent OSTimeTick() from readying task */ ptcb->OSTCBEventPtr = (OS_EVENT *)0; /* Unlink ECB from this task */ #if (OS_Q_EN && (OS_MAX_QS >= 2)) || OS_MBOX_EN ptcb->OSTCBMsg = msg; /* Send message directly to waiting task */ #else msg = msg; /* Prevent compiler warning if not used */ #endif ptcb->OSTCBStat &= ~msk; /* Clear bit associated with event type */ if (ptcb->OSTCBStat == OS_STAT_RDY) { /* See if task is ready (could be susp'd) */ OSRdyGrp |= bity; /* Put task in the ready to run list */ OSRdyTbl[y] |= bitx; } } #endif /*$PAGE*/ /* ********************************************************************************************************* * MAKE TASK WAIT FOR EVENT TO OCCUR * * Description: This function is called by other uC/OS-II services to suspend a task because an event has * not occurred. * * Arguments : pevent is a pointer to the event control block for which the task will be waiting for. * * Returns : none * * Note : This function is INTERNAL to uC/OS-II and your application should not call it. ********************************************************************************************************* */ #if (OS_Q_EN && (OS_MAX_QS >= 2)) || OS_MBOX_EN || OS_SEM_EN void OSEventTaskWait (OS_EVENT *pevent) { OSTCBCur->OSTCBEventPtr = pevent; /* Store pointer to event control block in TCB */ if ((OSRdyTbl[OSTCBCur->OSTCBY] &= ~OSTCBCur->OSTCBBitX) == 0) { /* Task no longer ready */ OSRdyGrp &= ~OSTCBCur->OSTCBBitY; } pevent->OSEventTbl[OSTCBCur->OSTCBY] |= OSTCBCur->OSTCBBitX; /* Put task in waiting list */ pevent->OSEventGrp |= OSTCBCur->OSTCBBitY; } #endif /*$PAGE*/ /* ********************************************************************************************************* * MAKE TASK READY TO RUN BASED ON EVENT TIMEOUT * * Description: This function is called by other uC/OS-II services to make a task ready to run because a * timeout occurred. * * Arguments : pevent is a pointer to the event control block which is readying a task. * * Returns : none * * Note : This function is INTERNAL to uC/OS-II and your application should not call it. ***********