?? os_flag.c
字號:
flags_rdy = pgrp->OSFlagFlags & flags; /* Extract only the bits we want */
if (flags_rdy == flags) { /* Must match ALL the bits that we want */
if (consume == TRUE) { /* See if we need to consume the flags */
pgrp->OSFlagFlags &= ~flags_rdy; /* Clear ONLY the flags that we wanted */
}
OSTCBCur->OSTCBFlagsRdy = flags_rdy; /* Save flags that were ready */
OS_EXIT_CRITICAL(); /* Yes, condition met, return to caller */
*err = OS_NO_ERR;
return (flags_rdy);
} else { /* Block task until events occur or timeout */
OS_FlagBlock(pgrp, &node, flags, wait_type, timeout);
OS_EXIT_CRITICAL();
}
break;
case OS_FLAG_WAIT_SET_ANY:
flags_rdy = pgrp->OSFlagFlags & flags; /* Extract only the bits we want */
if (flags_rdy != (OS_FLAGS)0) { /* See if any flag set */
if (consume == TRUE) { /* See if we need to consume the flags */
pgrp->OSFlagFlags &= ~flags_rdy; /* Clear ONLY the flags that we got */
}
OSTCBCur->OSTCBFlagsRdy = flags_rdy; /* Save flags that were ready */
OS_EXIT_CRITICAL(); /* Yes, condition met, return to caller */
*err = OS_NO_ERR;
return (flags_rdy);
} else { /* Block task until events occur or timeout */
OS_FlagBlock(pgrp, &node, flags, wait_type, timeout);
OS_EXIT_CRITICAL();
}
break;
#if OS_FLAG_WAIT_CLR_EN > 0
case OS_FLAG_WAIT_CLR_ALL: /* See if all required flags are cleared */
flags_rdy = ~pgrp->OSFlagFlags & flags; /* Extract only the bits we want */
if (flags_rdy == flags) { /* Must match ALL the bits that we want */
if (consume == TRUE) { /* See if we need to consume the flags */
pgrp->OSFlagFlags |= flags_rdy; /* Set ONLY the flags that we wanted */
}
OSTCBCur->OSTCBFlagsRdy = flags_rdy; /* Save flags that were ready */
OS_EXIT_CRITICAL(); /* Yes, condition met, return to caller */
*err = OS_NO_ERR;
return (flags_rdy);
} else { /* Block task until events occur or timeout */
OS_FlagBlock(pgrp, &node, flags, wait_type, timeout);
OS_EXIT_CRITICAL();
}
break;
case OS_FLAG_WAIT_CLR_ANY:
flags_rdy = ~pgrp->OSFlagFlags & flags; /* Extract only the bits we want */
if (flags_rdy != (OS_FLAGS)0) { /* See if any flag cleared */
if (consume == TRUE) { /* See if we need to consume the flags */
pgrp->OSFlagFlags |= flags_rdy; /* Set ONLY the flags that we got */
}
OSTCBCur->OSTCBFlagsRdy = flags_rdy; /* Save flags that were ready */
OS_EXIT_CRITICAL(); /* Yes, condition met, return to caller */
*err = OS_NO_ERR;
return (flags_rdy);
} else { /* Block task until events occur or timeout */
OS_FlagBlock(pgrp, &node, flags, wait_type, timeout);
OS_EXIT_CRITICAL();
}
break;
#endif
default:
OS_EXIT_CRITICAL();
flags_rdy = (OS_FLAGS)0;
*err = OS_FLAG_ERR_WAIT_TYPE;
return (flags_rdy);
}
OS_Sched(); /* Find next HPT ready to run */
OS_ENTER_CRITICAL();
if (OSTCBCur->OSTCBStat & OS_STAT_FLAG) { /* Have we timed-out? */
OS_FlagUnlink(&node);
OSTCBCur->OSTCBStat = OS_STAT_RDY; /* Yes, make task ready-to-run */
OS_EXIT_CRITICAL();
flags_rdy = (OS_FLAGS)0;
*err = OS_TIMEOUT; /* Indicate that we timed-out waiting */
} else {
if (consume == TRUE) { /* See if we need to consume the flags */
switch (wait_type) {
case OS_FLAG_WAIT_SET_ALL:
case OS_FLAG_WAIT_SET_ANY: /* Clear ONLY the flags we got */
pgrp->OSFlagFlags &= ~OSTCBCur->OSTCBFlagsRdy;
flags_rdy = OSTCBCur->OSTCBFlagsRdy;
break;
#if OS_FLAG_WAIT_CLR_EN > 0
case OS_FLAG_WAIT_CLR_ALL:
case OS_FLAG_WAIT_CLR_ANY: /* Set ONLY the flags we got */
pgrp->OSFlagFlags |= OSTCBCur->OSTCBFlagsRdy;
flags_rdy = OSTCBCur->OSTCBFlagsRdy;
break;
#endif
default:
OS_EXIT_CRITICAL();
*err = OS_FLAG_ERR_WAIT_TYPE;
return ((OS_FLAGS)0);
}
}
OS_EXIT_CRITICAL();
*err = OS_NO_ERR; /* Event(s) must have occurred */
}
return (flags_rdy);
}
/*$PAGE*/
/*
*********************************************************************************************************
* GET FLAGS WHO CAUSED TASK TO BECOME READY
*
* Description: This function is called to obtain the flags that caused the task to become ready to run.
* In other words, this function allows you to tell "Who done it!".
*
* Arguments : None
*
* Returns : The flags that caused the task to be ready.
*
* Called from: Task ONLY
*********************************************************************************************************
*/
OS_FLAGS OSFlagPendGetFlagsRdy (void)
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
OS_FLAGS flags;
OS_ENTER_CRITICAL();
flags = OSTCBCur->OSTCBFlagsRdy;
OS_EXIT_CRITICAL();
return (flags);
}
/*$PAGE*/
/*
*********************************************************************************************************
* POST EVENT FLAG BIT(S)
*
* Description: This function is called to set or clear some bits in an event flag group. The bits to
* set or clear are specified by a 'bit mask'.
*
* Arguments : pgrp is a pointer to the desired event flag group.
*
* flags If 'opt' (see below) is OS_FLAG_SET, each bit that is set in 'flags' will
* set the corresponding bit in the event flag group. e.g. to set bits 0, 4
* and 5 you would set 'flags' to:
*
* 0x31 (note, bit 0 is least significant bit)
*
* If 'opt' (see below) is OS_FLAG_CLR, each bit that is set in 'flags' will
* CLEAR the corresponding bit in the event flag group. e.g. to clear bits 0,
* 4 and 5 you would specify 'flags' as:
*
* 0x31 (note, bit 0 is least significant bit)
*
* opt indicates whether the flags will be:
* set (OS_FLAG_SET) or
* cleared (OS_FLAG_CLR)
*
* err is a pointer to an error code and can be:
* OS_NO_ERR The call was successfull
* OS_FLAG_INVALID_PGRP You passed a NULL pointer
* OS_ERR_EVENT_TYPE You are not pointing to an event flag group
* OS_FLAG_INVALID_OPT You specified an invalid option
*
* Returns : the new value of the event flags bits that are still set.
*
* Called From: Task or ISR
*
* WARNING(s) : 1) The execution time of this function depends on the number of tasks waiting on the event
* flag group.
* 2) The amount of time interrupts are DISABLED depends on the number of tasks waiting on
* the event flag group.
*********************************************************************************************************
*/
OS_FLAGS OSFlagPost (OS_FLAG_GRP *pgrp, OS_FLAGS flags, INT8U opt, INT8U *err)
{
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr;
#endif
OS_FLAG_NODE *pnode;
BOOLEAN sched;
OS_FLAGS flags_cur;
OS_FLAGS flags_rdy;
BOOLEAN rdy;
#if OS_ARG_CHK_EN > 0
if (pgrp == (OS_FLAG_GRP *)0) { /* Validate 'pgrp' */
*err = OS_FLAG_INVALID_PGRP;
return ((OS_FLAGS)0);
}
#endif
if (pgrp->OSFlagType != OS_EVENT_TYPE_FLAG) { /* Make sure we are pointing to an event flag grp */
*err = OS_ERR_EVENT_TYPE;
return ((OS_FLAGS)0);
}
/*$PAGE*/
OS_ENTER_CRITICAL();
switch (opt) {
case OS_FLAG_CLR:
pgrp->OSFlagFlags &= ~flags; /* Clear the flags specified in the group */
break;
case OS_FLAG_SET:
pgrp->OSFlagFlags |= flags; /* Set the flags specified in the group */
break;
default:
OS_EXIT_CRITICAL(); /* INVALID option */
*err = OS_FLAG_INVALID_OPT;
return ((OS_FLAGS)0);
}
sched = FALSE; /* Indicate that we don't need rescheduling */
pnode = (OS_FLAG_NODE *)pgrp->OSFlagWaitList;
while (pnode != (OS_FLAG_NODE *)0) { /* Go through all tasks waiting on event flag(s) */
switch (pnode->OSFlagNodeWaitType) {
case OS_FLAG_WAIT_SET_ALL: /* See if all req. flags are set for current node */
flags_rdy = pgrp->OSFlagFlags & pnode->OSFlagNodeFlags;
if (flags_rdy == pnode->OSFlagNodeFlags) {
rdy = OS_FlagTaskRdy(pnode, flags_rdy); /* Make task RTR, event(s) Rx'd */
if (rdy == TRUE) {
sched = TRUE; /* When done we will reschedule */
}
}
break;
case OS_FLAG_WAIT_SET_ANY: /* See if any flag set */
flags_rdy = pgrp->OSFlagFlags & pnode->OSFlagNodeFlags;
if (flags_rdy != (OS_FLAGS)0) {
rdy = OS_FlagTaskRdy(pnode, flags_rdy); /* Make task RTR, event(s) Rx'd */
if (rdy == TRUE) {
sched = TRUE; /* When done we will reschedule */
}
}
break;
#if OS_FLAG_WAIT_CLR_EN > 0
case OS_FLAG_WAIT_CLR_ALL: /* See if all req. flags are set for current node */
flags_rdy = ~pgrp->OSFlagFlags & pnode->OSFlagNodeFlags;
if (flags_rdy == pnode->OSFlagNodeFlags) {
rdy = OS_FlagTaskRdy(pnode, flags_rdy); /* Make task RTR, event(s) Rx'd */
if (rdy == TRUE) {
sched = TRUE; /* When done we will reschedule */
}
}
break;
case OS_FLAG_WAIT_CLR_ANY: /* See if any flag set */
flags_rdy = ~pgrp->OSFlagFlags & pnode->OSFlagNodeFlags;
if (flags_rdy != (OS_FLAGS)0) {
rdy = OS_FlagTaskRdy(pnode, flags_rdy); /* Make task RTR, event(s) Rx'd */
if (rdy == TRUE) {
sched = TRUE; /* When done we will reschedule */
}
}
break;
#endif
default:
OS_EXIT_CRITICAL();
*err = OS_FLAG_ERR_WAIT_TYPE;
return ((OS_FLAGS)0);
}
pnode = (OS_FLAG_NODE *)pnode->OSFlagNodeNext; /* Point to next task waiting for event flag(s) */
}
OS_EXIT_CRITICAL();
if (sched == TRUE) {
OS_Sched();
}
OS_ENTER_CRITICAL();
flags_cur = pgrp->OSFlagFlags;
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