====== OSA : OS_Wait_TO ======
<color blue>**OS_Wait_TO (condition, timeout)**</color>\\ 
=== ===

{{osa:ref:attr_call_task.png|Allowed only in task}}{{osa:ref:attr_call_ct_sw.png|Switches context}}{{osa:ref:attr_call_to.png|Uses timer}}

Wait until //condition// is true. If timeout expires before this event occurs, then stop waiting with Timeout flag set (see ##[[en:osa:ref:allservices:OS_IsTimeout|OS_IsTimeout]]##)

=== Call allowed: ===
Only in task


=== Parameters: ===
{| class = "fpl"
|-
|//''condition''//
|Any boolean expression
|-
|//''timeout''//
|Time of waiting in system ticks - calling ##[[en:osa:ref:allservices:OS_Timer|OS_Timer]]## periods
|}


=== Returns: ===
{| class = "fpl"
|-
|//''timeout''//
|If timeout expired then system service ##[[en:osa:ref:allservices:OS_IsTimeout|OS_IsTimeout]]## will return **true**
|}


=== Example: ===
<code cpp>
void Task (void)
{
    for (;;) {
        /*...*/
        OS_Wait_TO(RB1 == 1, 50);  // Wait 50 ticks for RB1 == 1
        if (!OS_IsTimeout()) {
            //
            /*...*/
        }
        /*...*/
    }
}
</code>


=== Old style name ===

<color gray>**OS_WaitConditionTimeout**</color>\\ 






<color gray>**OS_Cond_Wait_TO**</color>\\ 








=== See also ===

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