====== OSA : OS_Squeue_Check ======
<color blue>**bool OS_Squeue_Check (squeue)**</color>\\ 
<color blue>**bool OS_Squeue_Check_I (squeue)**</color>\\ 
=== ===


Check if there is any message in queue of simple messages.

##[[en:osa:ref:appendix:configuration#System constants|OS_ENABLE_SQUEUE]]## constant must be defined in ##[[en:osa:ref:appendix:configuration|OSAcfg.h]]##.
<note>
For PIC16, message queues can be allocated only in **bank0** or **bank1**
</note>


=== Call allowed: ===
Everywhere


=== Parameters: ===
{| class = "fpl"
|-
|//''squeue''//
|Queue of simple messages descriptor. Variable of ##[[en:osa:ref:description:data_types#OST_SQUEUE|OST_SQUEUE]]## type.
|}


=== Returns: ===
{| class = "fpl"
|-
|//''false''//
| queue is empty
|-
|//''true''//
| there is at least one simple message in queue
|}


=== Example: ===
<code cpp>
OST_SQUEUE squeue;

void Task (void)
{
    OST_SMSG smsg;
    for (;;) {
        /*...*/
        if (OS_Squeue_Check (squeue)) {         // If simple message present
            OS_AcceptSQueue(squeue, smsg);      // then accept it
            /*...*/
        }
        /*...*/
    }
}
</code>


=== Old style name ===
<color gray>**OS_CheckQSMsg**</color>\\ 








=== See also ===
  * [[en:osa:ref:allservices:OS_Squeue_Create|OS_Squeue_Create]]

  * [[en:osa:ref:allservices:OS_Squeue_Send|OS_Squeue_Send]]
  * [[en:osa:ref:allservices:OS_Squeue_Send_TO|OS_Squeue_Send_TO]]
  * [[en:osa:ref:allservices:OS_Squeue_Send_Now|OS_Squeue_Send_Now]]


  * [[en:osa:ref:allservices:OS_Squeue_IsFull|OS_Squeue_IsFull]]

  * [[en:osa:ref:allservices:OS_Squeue_Wait|OS_Squeue_Wait]]
  * [[en:osa:ref:allservices:OS_Squeue_Wait_TO|OS_Squeue_Wait_TO]]

----
  * [[en:osa:ref:services:alphabetical|Alphabetical]]
  * [[en:osa:ref:services:brieflist|All services]]
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