==== KbdSynch ====

**Bindings**: [[synch#C bindings|C]], [[synch#MASM bindings|MASM]]

This call synchronizes access from a keyboard subsystem to the keyboard device driver. 

KbdSynch (IOWait) 

//IOWait// (**USHORT**) - input 
Wait for the bond. Values are: 

^Value ^Definition ^
|0 |Indicates the requestor does not wait for access to the device driver. |
|1 |Indicates the requestor waits for access to the device driver. |

//rc// (**USHORT**) - return 
Return code descriptions are: 

|0 |NO_ERROR |
|121 |ERROR_SEM_TIMEOUT |

**Remarks**

//KbdSynch// blocks all other threads within a session until return from the subsystem to the router. To ensure proper synchronization, //KbdSynch// should be issued by a keyboard subsystem if it intends to issue a //DosDevIOCtl// or access dynamically shared data. //KbdSynch// does not protect globally shared data from threads in other sessions. 

=== C bindings ===

<code c>
#define INCL_KBD

USHORT  rc = KbdSynch(IOWait);

USHORT           IOWait;        /* Indicate if wait */

USHORT           rc;            /* return code */
</code>

=== MASM bindings ===

<code asm>
EXTRN  KbdSynch:FAR
INCL_KBD            EQU 1

PUSH   WORD    IOWait        ;Indicate if wait
CALL   KbdSynch

Returns WORD
</code>