This call provides synchronous access for a mouse subsystem to the mouse device driver.
MouSynch (IOWait)
IOWait (USHORT) - input Wait for access. The flag Word is defined as follows:
| Value | Definition |
|---|---|
| 0 | Control immediately returned to requestor. |
| 1 | Requestor waits until mouse device driver is free. |
rc (USHORT) - return Return code descriptions are:
| 0 | NO_ERROR |
| 121 | ERROR_SEM_TIMEOUT |
Remarks
MouSynch blocks all other threads within a session until the semaphore clears (returns from the subsystem to the router). To ensure proper synchronization, MouSynch should be issued by a mouse subsystem if it intends to access dynamically modifiable shared data for each session or if it intends to issue a DosDevIOCtl. MouSynch does not protect globally shared data from threads in other sessions.
#define INCL_MOU USHORT rc = MouSynch(IOWait); USHORT IOWait; /* Indicate wait/no wait */ USHORT rc; /* return code */
EXTRN MouSynch:FAR INCL_MOU EQU 1 PUSH WORD IOWait ;Indicate wait/no wait CALL MouSynch Returns WORD