WM SEM4

This message is sent or posted by an application.

Syntax

param1
    ULONG    flAccumBits; /* Semaphore value. */

param2
    ULONG    ulReserved1; /* Reserved value, should be 0. */

Parameters

flAccumBits (ULONG) - Input

Semaphore value. The semaphore values from all the WM_SEM4 messages posted to a queue, are accumulated by a logical-OR operation.

ulReserved1 (ULONG) - Input

Reserved value, should be 0.

Returns

ulReserved2 (ULONG) - returns

Reserved value, should be 0.

Remarks

If the message is posted, it is merged with any existing WM_SEM4 message on the queue by combining the two flAccumBits values using a logical-OR operation.

The WM_SEM4 messages are queued lower than any other type of message.

Default Processing

The default window procedure takes no action on this message, other than to set ulReserved1 to 0.