MouSynch

This call provides synchronous access for a mouse subsystem to the mouse device driver.

Syntax

MouSynch (IOWait)

Parameters

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.

Return Code

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.

Example Code

C Binding

#define INCL_MOU

USHORT  rc = MouSynch(IOWait);

USHORT           IOWait;        /* Indicate wait/no wait */

USHORT           rc;            /* return code */

MASM Binding

EXTRN  MouSynch:FAR
INCL_MOU            EQU 1

PUSH   WORD    IOWait        ;Indicate wait/no wait
CALL   MouSynch

Returns WORD