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630 lines
29 KiB
Plaintext
630 lines
29 KiB
Plaintext
/*
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*********************************************************************************************************
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* uC/OS-II
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* The Real-Time Kernel
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* SEMAPHORE MANAGEMENT
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*
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* (c) Copyright 1992-2007, Jean J. Labrosse, Weston, FL
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* All Rights Reserved
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*
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* File : OS_SEM.C
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* By : Jean J. Labrosse
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* Version : V2.85
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*
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* LICENSING TERMS:
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* ---------------
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* uC/OS-II is provided in source form for FREE evaluation, for educational use or for peaceful research.
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* If you plan on using uC/OS-II in a commercial product you need to contact Micriµm to properly license
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* its use in your product. We provide ALL the source code for your convenience and to help you experience
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* uC/OS-II. The fact that the source is provided does NOT mean that you can use it without paying a
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* licensing fee.
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*********************************************************************************************************
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*/
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#ifndef OS_MASTER_FILE
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#include <ucos_ii.h>
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#endif
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#if OS_SEM_EN > 0
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/*$PAGE*/
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/*
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*********************************************************************************************************
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* ACCEPT SEMAPHORE
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*
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* Description: This function checks the semaphore to see if a resource is available or, if an event
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* occurred. Unlike OSSemPend(), OSSemAccept() does not suspend the calling task if the
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* resource is not available or the event did not occur.
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*
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* Arguments : pevent is a pointer to the event control block
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*
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* Returns : > 0 if the resource is available or the event did not occur the semaphore is
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* decremented to obtain the resource.
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* == 0 if the resource is not available or the event did not occur or,
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* if 'pevent' is a NULL pointer or,
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* if you didn't pass a pointer to a semaphore
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*********************************************************************************************************
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*/
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#if OS_SEM_ACCEPT_EN > 0
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INT16U OSSemAccept (OS_EVENT *pevent)
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{
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INT16U cnt;
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#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
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OS_CPU_SR cpu_sr = 0;
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#endif
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#if OS_ARG_CHK_EN > 0
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if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
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return (0);
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}
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#endif
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if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
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return (0);
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}
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OS_ENTER_CRITICAL();
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cnt = pevent->OSEventCnt;
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if (cnt > 0) { /* See if resource is available */
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pevent->OSEventCnt--; /* Yes, decrement semaphore and notify caller */
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}
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OS_EXIT_CRITICAL();
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return (cnt); /* Return semaphore count */
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}
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#endif
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/*$PAGE*/
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/*
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*********************************************************************************************************
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* CREATE A SEMAPHORE
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*
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* Description: This function creates a semaphore.
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*
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* Arguments : cnt is the initial value for the semaphore. If the value is 0, no resource is
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* available (or no event has occurred). You initialize the semaphore to a
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* non-zero value to specify how many resources are available (e.g. if you have
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* 10 resources, you would initialize the semaphore to 10).
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*
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* Returns : != (void *)0 is a pointer to the event control block (OS_EVENT) associated with the
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* created semaphore
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* == (void *)0 if no event control blocks were available
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*********************************************************************************************************
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*/
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OS_EVENT *OSSemCreate (INT16U cnt)
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{
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OS_EVENT *pevent;
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#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
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OS_CPU_SR cpu_sr = 0;
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#endif
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if (OSIntNesting > 0) { /* See if called from ISR ... */
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return ((OS_EVENT *)0); /* ... can't CREATE from an ISR */
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}
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OS_ENTER_CRITICAL();
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pevent = OSEventFreeList; /* Get next free event control block */
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if (OSEventFreeList != (OS_EVENT *)0) { /* See if pool of free ECB pool was empty */
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OSEventFreeList = (OS_EVENT *)OSEventFreeList->OSEventPtr;
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}
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OS_EXIT_CRITICAL();
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if (pevent != (OS_EVENT *)0) { /* Get an event control block */
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pevent->OSEventType = OS_EVENT_TYPE_SEM;
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pevent->OSEventCnt = cnt; /* Set semaphore value */
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pevent->OSEventPtr = (void *)0; /* Unlink from ECB free list */
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#if OS_EVENT_NAME_SIZE > 1
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pevent->OSEventName[0] = '?'; /* Unknown name */
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pevent->OSEventName[1] = OS_ASCII_NUL;
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#endif
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OS_EventWaitListInit(pevent); /* Initialize to 'nobody waiting' on sem. */
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}
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return (pevent);
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}
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/*$PAGE*/
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/*
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*********************************************************************************************************
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* DELETE A SEMAPHORE
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*
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* Description: This function deletes a semaphore and readies all tasks pending on the semaphore.
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*
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* Arguments : pevent is a pointer to the event control block associated with the desired
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* semaphore.
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*
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* opt determines delete options as follows:
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* opt == OS_DEL_NO_PEND Delete semaphore ONLY if no task pending
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* opt == OS_DEL_ALWAYS Deletes the semaphore even if tasks are waiting.
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* In this case, all the tasks pending will be readied.
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*
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* perr is a pointer to an error code that can contain one of the following values:
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* OS_ERR_NONE The call was successful and the semaphore was deleted
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* OS_ERR_DEL_ISR If you attempted to delete the semaphore from an ISR
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* OS_ERR_INVALID_OPT An invalid option was specified
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* OS_ERR_TASK_WAITING One or more tasks were waiting on the semaphore
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* OS_ERR_EVENT_TYPE If you didn't pass a pointer to a semaphore
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* OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer.
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*
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* Returns : pevent upon error
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* (OS_EVENT *)0 if the semaphore was successfully deleted.
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*
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* Note(s) : 1) This function must be used with care. Tasks that would normally expect the presence of
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* the semaphore MUST check the return code of OSSemPend().
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* 2) OSSemAccept() callers will not know that the intended semaphore has been deleted unless
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* they check 'pevent' to see that it's a NULL pointer.
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* 3) This call can potentially disable interrupts for a long time. The interrupt disable
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* time is directly proportional to the number of tasks waiting on the semaphore.
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* 4) Because ALL tasks pending on the semaphore will be readied, you MUST be careful in
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* applications where the semaphore is used for mutual exclusion because the resource(s)
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* will no longer be guarded by the semaphore.
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*********************************************************************************************************
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*/
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#if OS_SEM_DEL_EN > 0
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OS_EVENT *OSSemDel (OS_EVENT *pevent, INT8U opt, INT8U *perr)
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{
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BOOLEAN tasks_waiting;
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OS_EVENT *pevent_return;
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#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
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OS_CPU_SR cpu_sr = 0;
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#endif
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#if OS_ARG_CHK_EN > 0
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if (perr == (INT8U *)0) { /* Validate 'perr' */
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return (pevent);
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}
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if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
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*perr = OS_ERR_PEVENT_NULL;
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return (pevent);
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}
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#endif
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if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
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*perr = OS_ERR_EVENT_TYPE;
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return (pevent);
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}
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if (OSIntNesting > 0) { /* See if called from ISR ... */
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*perr = OS_ERR_DEL_ISR; /* ... can't DELETE from an ISR */
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return (pevent);
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}
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OS_ENTER_CRITICAL();
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if (pevent->OSEventGrp != 0) { /* See if any tasks waiting on semaphore */
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tasks_waiting = OS_TRUE; /* Yes */
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} else {
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tasks_waiting = OS_FALSE; /* No */
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}
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switch (opt) {
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case OS_DEL_NO_PEND: /* Delete semaphore only if no task waiting */
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if (tasks_waiting == OS_FALSE) {
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#if OS_EVENT_NAME_SIZE > 1
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pevent->OSEventName[0] = '?'; /* Unknown name */
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pevent->OSEventName[1] = OS_ASCII_NUL;
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#endif
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pevent->OSEventType = OS_EVENT_TYPE_UNUSED;
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pevent->OSEventPtr = OSEventFreeList; /* Return Event Control Block to free list */
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pevent->OSEventCnt = 0;
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OSEventFreeList = pevent; /* Get next free event control block */
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OS_EXIT_CRITICAL();
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*perr = OS_ERR_NONE;
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pevent_return = (OS_EVENT *)0; /* Semaphore has been deleted */
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} else {
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OS_EXIT_CRITICAL();
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*perr = OS_ERR_TASK_WAITING;
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pevent_return = pevent;
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}
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break;
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case OS_DEL_ALWAYS: /* Always delete the semaphore */
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while (pevent->OSEventGrp != 0) { /* Ready ALL tasks waiting for semaphore */
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(void)OS_EventTaskRdy(pevent, (void *)0, OS_STAT_SEM, OS_STAT_PEND_OK);
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}
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#if OS_EVENT_NAME_SIZE > 1
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pevent->OSEventName[0] = '?'; /* Unknown name */
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pevent->OSEventName[1] = OS_ASCII_NUL;
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#endif
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pevent->OSEventType = OS_EVENT_TYPE_UNUSED;
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pevent->OSEventPtr = OSEventFreeList; /* Return Event Control Block to free list */
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pevent->OSEventCnt = 0;
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OSEventFreeList = pevent; /* Get next free event control block */
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OS_EXIT_CRITICAL();
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if (tasks_waiting == OS_TRUE) { /* Reschedule only if task(s) were waiting */
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OS_Sched(); /* Find highest priority task ready to run */
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}
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*perr = OS_ERR_NONE;
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pevent_return = (OS_EVENT *)0; /* Semaphore has been deleted */
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break;
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default:
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OS_EXIT_CRITICAL();
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*perr = OS_ERR_INVALID_OPT;
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pevent_return = pevent;
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break;
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}
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return (pevent_return);
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}
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#endif
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/*$PAGE*/
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/*
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*********************************************************************************************************
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* PEND ON SEMAPHORE
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*
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* Description: This function waits for a semaphore.
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*
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* Arguments : pevent is a pointer to the event control block associated with the desired
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* semaphore.
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*
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* timeout is an optional timeout period (in clock ticks). If non-zero, your task will
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* wait for the resource up to the amount of time specified by this argument.
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* If you specify 0, however, your task will wait forever at the specified
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* semaphore or, until the resource becomes available (or the event occurs).
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*
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* perr is a pointer to where an error message will be deposited. Possible error
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* messages are:
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*
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* OS_ERR_NONE The call was successful and your task owns the resource
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* or, the event you are waiting for occurred.
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* OS_ERR_TIMEOUT The semaphore was not received within the specified
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* 'timeout'.
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* OS_ERR_PEND_ABORT The wait on the semaphore was aborted.
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* OS_ERR_EVENT_TYPE If you didn't pass a pointer to a semaphore.
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* OS_ERR_PEND_ISR If you called this function from an ISR and the result
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* would lead to a suspension.
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* OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer.
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* OS_ERR_PEND_LOCKED If you called this function when the scheduler is locked
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*
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* Returns : none
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*********************************************************************************************************
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*/
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void OSSemPend (OS_EVENT *pevent, INT16U timeout, INT8U *perr)
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{
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INT8U pend_stat;
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#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
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OS_CPU_SR cpu_sr = 0;
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#endif
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#if OS_ARG_CHK_EN > 0
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if (perr == (INT8U *)0) { /* Validate 'perr' */
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return;
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}
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if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
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*perr = OS_ERR_PEVENT_NULL;
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return;
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}
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#endif
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if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
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*perr = OS_ERR_EVENT_TYPE;
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return;
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}
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if (OSIntNesting > 0) { /* See if called from ISR ... */
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*perr = OS_ERR_PEND_ISR; /* ... can't PEND from an ISR */
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return;
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}
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if (OSLockNesting > 0) { /* See if called with scheduler locked ... */
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*perr = OS_ERR_PEND_LOCKED; /* ... can't PEND when locked */
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return;
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}
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OS_ENTER_CRITICAL();
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if (pevent->OSEventCnt > 0) { /* If sem. is positive, resource available ... */
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pevent->OSEventCnt--; /* ... decrement semaphore only if positive. */
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OS_EXIT_CRITICAL();
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*perr = OS_ERR_NONE;
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return;
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}
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/* Otherwise, must wait until event occurs */
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OSTCBCur->OSTCBStat |= OS_STAT_SEM; /* Resource not available, pend on semaphore */
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OSTCBCur->OSTCBStatPend = OS_STAT_PEND_OK;
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OSTCBCur->OSTCBDly = timeout; /* Store pend timeout in TCB */
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OS_EventTaskWait(pevent); /* Suspend task until event or timeout occurs */
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OS_EXIT_CRITICAL();
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OS_Sched(); /* Find next highest priority task ready */
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OS_ENTER_CRITICAL();
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if (OSTCBCur->OSTCBStatPend != OS_STAT_PEND_OK) { /* See if we timed-out or aborted */
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pend_stat = OSTCBCur->OSTCBStatPend;
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OS_EventTOAbort(pevent);
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OS_EXIT_CRITICAL();
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switch (pend_stat) {
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case OS_STAT_PEND_TO:
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default:
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*perr = OS_ERR_TIMEOUT; /* Indicate that didn't get event within TO */
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break;
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case OS_STAT_PEND_ABORT:
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*perr = OS_ERR_PEND_ABORT; /* Indicate that we aborted */
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break;
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}
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return;
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}
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OSTCBCur->OSTCBEventPtr = (OS_EVENT *)0;
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OS_EXIT_CRITICAL();
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*perr = OS_ERR_NONE;
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}
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/*$PAGE*/
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/*
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*********************************************************************************************************
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* ABORT WAITING ON A SEMAPHORE
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*
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* Description: This function aborts & readies any tasks currently waiting on a semaphore. This function
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* should be used to fault-abort the wait on the semaphore, rather than to normally signal
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* the semaphore via OSSemPost().
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*
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* Arguments : pevent is a pointer to the event control block associated with the desired
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* semaphore.
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*
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* opt determines the type of ABORT performed:
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* OS_PEND_OPT_NONE ABORT wait for a single task (HPT) waiting on the
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* semaphore
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* OS_PEND_OPT_BROADCAST ABORT wait for ALL tasks that are waiting on the
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* semaphore
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*
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* perr is a pointer to where an error message will be deposited. Possible error
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* messages are:
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*
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* OS_ERR_NONE No tasks were waiting on the semaphore.
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* OS_ERR_PEND_ABORT At least one task waiting on the semaphore was readied
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* and informed of the aborted wait; check return value
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* for the number of tasks whose wait on the semaphore
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* was aborted.
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* OS_ERR_EVENT_TYPE If you didn't pass a pointer to a semaphore.
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* OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer.
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*
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* Returns : == 0 if no tasks were waiting on the semaphore, or upon error.
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* > 0 if one or more tasks waiting on the semaphore are now readied and informed.
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*********************************************************************************************************
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*/
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#if OS_SEM_PEND_ABORT_EN > 0
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INT8U OSSemPendAbort (OS_EVENT *pevent, INT8U opt, INT8U *perr)
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{
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INT8U nbr_tasks;
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#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
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OS_CPU_SR cpu_sr = 0;
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#endif
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#if OS_ARG_CHK_EN > 0
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if (perr == (INT8U *)0) { /* Validate 'perr' */
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return (0);
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}
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if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
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*perr = OS_ERR_PEVENT_NULL;
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return (0);
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}
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#endif
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if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
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*perr = OS_ERR_EVENT_TYPE;
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return (0);
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}
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OS_ENTER_CRITICAL();
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if (pevent->OSEventGrp != 0) { /* See if any task waiting on semaphore? */
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nbr_tasks = 0;
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switch (opt) {
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case OS_PEND_OPT_BROADCAST: /* Do we need to abort ALL waiting tasks? */
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while (pevent->OSEventGrp != 0) { /* Yes, ready ALL tasks waiting on semaphore */
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(void)OS_EventTaskRdy(pevent, (void *)0, OS_STAT_SEM, OS_STAT_PEND_ABORT);
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nbr_tasks++;
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}
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break;
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case OS_PEND_OPT_NONE: /* No, ready HPT waiting on semaphore */
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default:
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(void)OS_EventTaskRdy(pevent, (void *)0, OS_STAT_SEM, OS_STAT_PEND_ABORT);
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nbr_tasks++;
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break;
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}
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OS_EXIT_CRITICAL();
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OS_Sched(); /* Find HPT ready to run */
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*perr = OS_ERR_PEND_ABORT;
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return (nbr_tasks);
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}
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OS_EXIT_CRITICAL();
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*perr = OS_ERR_NONE;
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return (0); /* No tasks waiting on semaphore */
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}
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#endif
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/*$PAGE*/
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/*
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*********************************************************************************************************
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* POST TO A SEMAPHORE
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*
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* Description: This function signals a semaphore
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*
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* Arguments : pevent is a pointer to the event control block associated with the desired
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* semaphore.
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*
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* Returns : OS_ERR_NONE The call was successful and the semaphore was signaled.
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* OS_ERR_SEM_OVF If the semaphore count exceeded its limit. In other words, you have
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* signalled the semaphore more often than you waited on it with either
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* OSSemAccept() or OSSemPend().
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* OS_ERR_EVENT_TYPE If you didn't pass a pointer to a semaphore
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* OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer.
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*********************************************************************************************************
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*/
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INT8U OSSemPost (OS_EVENT *pevent)
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{
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#if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
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OS_CPU_SR cpu_sr = 0;
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#endif
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#if OS_ARG_CHK_EN > 0
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if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
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return (OS_ERR_PEVENT_NULL);
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}
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#endif
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if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
|
||
return (OS_ERR_EVENT_TYPE);
|
||
}
|
||
OS_ENTER_CRITICAL();
|
||
if (pevent->OSEventGrp != 0) { /* See if any task waiting for semaphore */
|
||
/* Ready HPT waiting on event */
|
||
(void)OS_EventTaskRdy(pevent, (void *)0, OS_STAT_SEM, OS_STAT_PEND_OK);
|
||
OS_EXIT_CRITICAL();
|
||
OS_Sched(); /* Find HPT ready to run */
|
||
return (OS_ERR_NONE);
|
||
}
|
||
if (pevent->OSEventCnt < 65535u) { /* Make sure semaphore will not overflow */
|
||
pevent->OSEventCnt++; /* Increment semaphore count to register event */
|
||
OS_EXIT_CRITICAL();
|
||
return (OS_ERR_NONE);
|
||
}
|
||
OS_EXIT_CRITICAL(); /* Semaphore value has reached its maximum */
|
||
return (OS_ERR_SEM_OVF);
|
||
}
|
||
|
||
/*$PAGE*/
|
||
/*
|
||
*********************************************************************************************************
|
||
* QUERY A SEMAPHORE
|
||
*
|
||
* Description: This function obtains information about a semaphore
|
||
*
|
||
* Arguments : pevent is a pointer to the event control block associated with the desired
|
||
* semaphore
|
||
*
|
||
* p_sem_data is a pointer to a structure that will contain information about the
|
||
* semaphore.
|
||
*
|
||
* Returns : OS_ERR_NONE The call was successful and the message was sent
|
||
* OS_ERR_EVENT_TYPE If you are attempting to obtain data from a non semaphore.
|
||
* OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer.
|
||
* OS_ERR_PDATA_NULL If 'p_sem_data' is a NULL pointer
|
||
*********************************************************************************************************
|
||
*/
|
||
|
||
#if OS_SEM_QUERY_EN > 0
|
||
INT8U OSSemQuery (OS_EVENT *pevent, OS_SEM_DATA *p_sem_data)
|
||
{
|
||
#if OS_LOWEST_PRIO <= 63
|
||
INT8U *psrc;
|
||
INT8U *pdest;
|
||
#else
|
||
INT16U *psrc;
|
||
INT16U *pdest;
|
||
#endif
|
||
INT8U i;
|
||
#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 (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
|
||
return (OS_ERR_PEVENT_NULL);
|
||
}
|
||
if (p_sem_data == (OS_SEM_DATA *)0) { /* Validate 'p_sem_data' */
|
||
return (OS_ERR_PDATA_NULL);
|
||
}
|
||
#endif
|
||
if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
|
||
return (OS_ERR_EVENT_TYPE);
|
||
}
|
||
OS_ENTER_CRITICAL();
|
||
p_sem_data->OSEventGrp = pevent->OSEventGrp; /* Copy message mailbox wait list */
|
||
psrc = &pevent->OSEventTbl[0];
|
||
pdest = &p_sem_data->OSEventTbl[0];
|
||
for (i = 0; i < OS_EVENT_TBL_SIZE; i++) {
|
||
*pdest++ = *psrc++;
|
||
}
|
||
p_sem_data->OSCnt = pevent->OSEventCnt; /* Get semaphore count */
|
||
OS_EXIT_CRITICAL();
|
||
return (OS_ERR_NONE);
|
||
}
|
||
#endif /* OS_SEM_QUERY_EN */
|
||
|
||
/*$PAGE*/
|
||
/*
|
||
*********************************************************************************************************
|
||
* SET SEMAPHORE
|
||
*
|
||
* Description: This function sets the semaphore count to the value specified as an argument. Typically,
|
||
* this value would be 0.
|
||
*
|
||
* You would typically use this function when a semaphore is used as a signaling mechanism
|
||
* and, you want to reset the count value.
|
||
*
|
||
* Arguments : pevent is a pointer to the event control block
|
||
*
|
||
* cnt is the new value for the semaphore count. You would pass 0 to reset the
|
||
* semaphore count.
|
||
*
|
||
* perr is a pointer to an error code returned by the function as follows:
|
||
*
|
||
* OS_ERR_NONE The call was successful and the semaphore value was set.
|
||
* OS_ERR_EVENT_TYPE If you didn't pass a pointer to a semaphore.
|
||
* OS_ERR_PEVENT_NULL If 'pevent' is a NULL pointer.
|
||
* OS_ERR_TASK_WAITING If tasks are waiting on the semaphore.
|
||
*********************************************************************************************************
|
||
*/
|
||
|
||
#if OS_SEM_SET_EN > 0
|
||
void OSSemSet (OS_EVENT *pevent, INT16U cnt, INT8U *perr)
|
||
{
|
||
#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 (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
|
||
*perr = OS_ERR_PEVENT_NULL;
|
||
return;
|
||
}
|
||
#endif
|
||
if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
|
||
*perr = OS_ERR_EVENT_TYPE;
|
||
return;
|
||
}
|
||
OS_ENTER_CRITICAL();
|
||
*perr = OS_ERR_NONE;
|
||
if (pevent->OSEventCnt > 0) { /* See if semaphore already has a count */
|
||
pevent->OSEventCnt = cnt; /* Yes, set it to the new value specified. */
|
||
} else { /* No */
|
||
if (pevent->OSEventGrp == 0) { /* See if task(s) waiting? */
|
||
pevent->OSEventCnt = cnt; /* No, OK to set the value */
|
||
} else {
|
||
*perr = OS_ERR_TASK_WAITING;
|
||
}
|
||
}
|
||
OS_EXIT_CRITICAL();
|
||
}
|
||
#endif
|
||
|
||
// ïðîâåðêà çíà÷åíèÿ ñåìàôîðà
|
||
INT16U OSSemCheck (OS_EVENT *pevent)
|
||
{
|
||
INT16U cnt;
|
||
#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 (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
|
||
return (0);
|
||
}
|
||
#endif
|
||
if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
|
||
return (0);
|
||
}
|
||
OS_ENTER_CRITICAL();
|
||
cnt = pevent->OSEventCnt;
|
||
OS_EXIT_CRITICAL();
|
||
return (cnt); /* Return semaphore count */
|
||
}
|
||
|
||
#endif /* OS_SEM_EN */
|