?? os_flag.c
字號:
#if OS_ARG_CHK_EN > 0
if (perr == (INT8U *)0) { /* Validate 'perr' */
return (pgrp);
}
if (pgrp == (OS_FLAG_GRP *)0) { /* Validate 'pgrp' */
*perr = OS_ERR_FLAG_INVALID_PGRP;
return (pgrp);
}
#endif
if (OSIntNesting > 0) { /* See if called from ISR ... */
*perr = OS_ERR_DEL_ISR; /* ... can't DELETE from an ISR */
return (pgrp);
}
if (pgrp->OSFlagType != OS_EVENT_TYPE_FLAG) { /* Validate event group type */
*perr = OS_ERR_EVENT_TYPE;
return (pgrp);
}
OS_ENTER_CRITICAL();
if (pgrp->OSFlagWaitList != (void *)0) { /* See if any tasks waiting on event flags */
tasks_waiting = OS_TRUE; /* Yes */
} else {
tasks_waiting = OS_FALSE; /* No */
}
switch (opt) {
case OS_DEL_NO_PEND: /* Delete group if no task waiting */
if (tasks_waiting == OS_FALSE) {
#if OS_FLAG_NAME_SIZE > 1
pgrp->OSFlagName[0] = '?'; /* Unknown name */
pgrp->OSFlagName[1] = OS_ASCII_NUL;
#endif
pgrp->OSFlagType = OS_EVENT_TYPE_UNUSED;
pgrp->OSFlagWaitList = (void *)OSFlagFreeList; /* Return group to free list */
pgrp->OSFlagFlags = (OS_FLAGS)0;
OSFlagFreeList = pgrp;
OS_EXIT_CRITICAL();
*perr = OS_ERR_NONE;
pgrp_return = (OS_FLAG_GRP *)0; /* Event Flag Group has been deleted */
} else {
OS_EXIT_CRITICAL();
*perr = OS_ERR_TASK_WAITING;
pgrp_return = pgrp;
}
break;
case OS_DEL_ALWAYS: /* Always delete the event flag group */
pnode = (OS_FLAG_NODE *)pgrp->OSFlagWaitList;
while (pnode != (OS_FLAG_NODE *)0) { /* Ready ALL tasks waiting for flags */
(void)OS_FlagTaskRdy(pnode, (OS_FLAGS)0);
pnode = (OS_FLAG_NODE *)pnode->OSFlagNodeNext;
}
#if OS_FLAG_NAME_SIZE > 1
pgrp->OSFlagName[0] = '?'; /* Unknown name */
pgrp->OSFlagName[1] = OS_ASCII_NUL;
#endif
pgrp->OSFlagType = OS_EVENT_TYPE_UNUSED;
pgrp->OSFlagWaitList = (void *)OSFlagFreeList;/* Return group to free list */
pgrp->OSFlagFlags = (OS_FLAGS)0;
OSFlagFreeList = pgrp;
OS_EXIT_CRITICAL();
if (tasks_waiting == OS_TRUE) { /* Reschedule only if task(s) were waiting */
OS_Sched(); /* Find highest priority task ready to run */
}
*perr = OS_ERR_NONE;
pgrp_return = (OS_FLAG_GRP *)0; /* Event Flag Group has been deleted */
break;
default:
OS_EXIT_CRITICAL();
*perr = OS_ERR_INVALID_OPT;
pgrp_return = pgrp;
break;
}
return (pgrp_return);
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
* GET THE NAME OF AN EVENT FLAG GROUP
*
* Description: This function is used to obtain the name assigned to an event flag group
*
* Arguments : pgrp is a pointer to the event flag group.
*
* pname is a pointer to an ASCII string that will receive the name of the event flag
* group. The string must be able to hold at least OS_FLAG_NAME_SIZE characters.
*
* perr is a pointer to an error code that can contain one of the following values:
*
* OS_ERR_NONE if the requested task is resumed
* OS_ERR_EVENT_TYPE if 'pevent' is not pointing to an event flag group
* OS_ERR_PNAME_NULL You passed a NULL pointer for 'pname'
* OS_ERR_FLAG_INVALID_PGRP if you passed a NULL pointer for 'pgrp'
* OS_ERR_NAME_GET_ISR if you called this function from an ISR
*
* Returns : The length of the string or 0 if the 'pgrp' is a NULL pointer.
*********************************************************************************************************
*/
#if OS_FLAG_NAME_SIZE > 1
INT8U OSFlagNameGet (OS_FLAG_GRP *pgrp, INT8U *pname, INT8U *perr)
{
INT8U len;
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr = 0;
#endif
#if OS_ARG_CHK_EN > 0
if (perr == (INT8U *)0) { /* Validate 'perr' */
return (0);
}
if (pgrp == (OS_FLAG_GRP *)0) { /* Is 'pgrp' a NULL pointer? */
*perr = OS_ERR_FLAG_INVALID_PGRP;
return (0);
}
if (pname == (INT8U *)0) { /* Is 'pname' a NULL pointer? */
*perr = OS_ERR_PNAME_NULL;
return (0);
}
#endif
if (OSIntNesting > 0) { /* See if trying to call from an ISR */
*perr = OS_ERR_NAME_GET_ISR;
return (0);
}
OS_ENTER_CRITICAL();
if (pgrp->OSFlagType != OS_EVENT_TYPE_FLAG) {
OS_EXIT_CRITICAL();
*perr = OS_ERR_EVENT_TYPE;
return (0);
}
len = OS_StrCopy(pname, pgrp->OSFlagName); /* Copy name from OS_FLAG_GRP */
OS_EXIT_CRITICAL();
*perr = OS_ERR_NONE;
return (len);
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
* ASSIGN A NAME TO AN EVENT FLAG GROUP
*
* Description: This function assigns a name to an event flag group.
*
* Arguments : pgrp is a pointer to the event flag group.
*
* pname is a pointer to an ASCII string that will be used as the name of the event flag
* group. The string must be able to hold at least OS_FLAG_NAME_SIZE characters.
*
* perr is a pointer to an error code that can contain one of the following values:
*
* OS_ERR_NONE if the requested task is resumed
* OS_ERR_EVENT_TYPE if 'pevent' is not pointing to an event flag group
* OS_ERR_PNAME_NULL You passed a NULL pointer for 'pname'
* OS_ERR_FLAG_INVALID_PGRP if you passed a NULL pointer for 'pgrp'
* OS_ERR_NAME_SET_ISR if you called this function from an ISR
*
* Returns : None
*********************************************************************************************************
*/
#if OS_FLAG_NAME_SIZE > 1
void OSFlagNameSet (OS_FLAG_GRP *pgrp, INT8U *pname, INT8U *perr)
{
INT8U len;
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr = 0;
#endif
#if OS_ARG_CHK_EN > 0
if (perr == (INT8U *)0) { /* Validate 'perr' */
return;
}
if (pgrp == (OS_FLAG_GRP *)0) { /* Is 'pgrp' a NULL pointer? */
*perr = OS_ERR_FLAG_INVALID_PGRP;
return;
}
if (pname == (INT8U *)0) { /* Is 'pname' a NULL pointer? */
*perr = OS_ERR_PNAME_NULL;
return;
}
#endif
if (OSIntNesting > 0) { /* See if trying to call from an ISR */
*perr = OS_ERR_NAME_SET_ISR;
return;
}
OS_ENTER_CRITICAL();
if (pgrp->OSFlagType != OS_EVENT_TYPE_FLAG) {
OS_EXIT_CRITICAL();
*perr = OS_ERR_EVENT_TYPE;
return;
}
len = OS_StrLen(pname); /* Can we fit the string in the storage area? */
if (len > (OS_FLAG_NAME_SIZE - 1)) { /* No */
OS_EXIT_CRITICAL();
*perr = OS_ERR_FLAG_NAME_TOO_LONG;
return;
}
(void)OS_StrCopy(pgrp->OSFlagName, pname); /* Yes, copy name from OS_FLAG_GRP */
OS_EXIT_CRITICAL();
*perr = OS_ERR_NONE;
return;
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
* WAIT ON AN EVENT FLAG GROUP
*
* Description: This function is called to wait for a combination of bits to be set in an event flag
* group. Your application can wait for ANY bit to be set or ALL bits to be set.
*
* Arguments : pgrp is a pointer to the desired event flag group.
*
* flags Is a bit pattern indicating which bit(s) (i.e. flags) you wish to wait for.
* The bits you want are specified by setting the corresponding bits in
* 'flags'. e.g. if your application wants to wait for bits 0 and 1 then
* 'flags' would contain 0x03.
*
* wait_type specifies whether you want ALL bits to be set or ANY of the bits to be set.
* You can specify the following argument:
*
* OS_FLAG_WAIT_CLR_ALL You will wait for ALL bits in 'mask' to be clear (0)
* OS_FLAG_WAIT_SET_ALL You will wait for ALL bits in 'mask' to be set (1)
* OS_FLAG_WAIT_CLR_ANY You will wait for ANY bit in 'mask' to be clear (0)
* OS_FLAG_WAIT_SET_ANY You will wait for ANY bit in 'mask' to be set (1)
*
* NOTE: Add OS_FLAG_CONSUME if you want the event flag to be 'consumed' by
* the call. Example, to wait for any flag in a group AND then clear
* the flags that are present, set 'wait_type' to:
*
* OS_FLAG_WAIT_SET_ANY + OS_FLAG_CONSUME
*
* timeout is an optional timeout (in clock ticks) that your task will wait for the
* desired bit combination. If you specify 0, however, your task will wait
* forever at the specified event flag group or, until a message arrives.
*
* perr is a pointer to an error code and can be:
* OS_ERR_NONE The desired bits have been set within the specified
* 'timeout'.
* OS_ERR_PEND_ISR If you tried to PEND from an ISR
* OS_ERR_FLAG_INVALID_PGRP If 'pgrp' is a NULL pointer.
* OS_ERR_EVENT_TYPE You are not pointing to an event flag group
* OS_ERR_TIMEOUT The bit(s) have not been set in the specified
* 'timeout'.
* OS_ERR_PEND_ABORT The wait on the flag was aborted.
* OS_ERR_FLAG_WAIT_TYPE You didn't specify a proper 'wait_type' argument.
*
* Returns : The flags in the event flag group that made the task ready or, 0 if a timeout or an error
* occurred.
*
* Called from: Task ONLY
*
* Note(s) : 1) IMPORTANT, the behavior of this function has changed from PREVIOUS versions. The
* function NOW returns the flags that were ready INSTEAD of the current state of the
* event flags.
*********************************************************************************************************
*/
OS_FLAGS OSFlagPend (OS_FLAG_GRP *pgrp, OS_FLAGS flags, INT8U wait_type, INT16U timeout, INT8U *perr)
{
OS_FLAG_NODE node;
OS_FLAGS flags_rdy;
INT8U result;
INT8U pend_stat;
BOOLEAN consume;
#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
OS_CPU_SR cpu_sr = 0;
#endif
#if OS_ARG_CHK_EN > 0
if (perr == (INT8U *)0) { /* Validate 'perr' */
return ((OS_FLAGS)0);
}
if (pgrp == (OS_FLAG_GRP *)0) { /* Validate 'pgrp' */
*perr = OS_ERR_FLAG_INVALID_PGRP;
return ((OS_FLAGS)0);
}
#endif
if (OSIntNesting > 0) { /* See if called from ISR ... */
*perr = OS_ERR_PEND_ISR; /* ... can't PEND from an ISR */
return ((OS_FLAGS)0);
}
if (OSLockNesting > 0) { /* See if called with scheduler locked ... */
*perr = OS_ERR_PEND_LOCKED; /* ... can't PEND when locked */
return ((OS_FLAGS)0);
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