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.
#define INCL_KBD USHORT rc = KbdSynch(IOWait); USHORT IOWait; /* Indicate if wait */ USHORT rc; /* return code */
EXTRN KbdSynch:FAR INCL_KBD EQU 1 PUSH WORD IOWait ;Indicate if wait CALL KbdSynch Returns WORD