Enters the region associated with the service. If mutual exclusion is desired between the service thread and the SendMessage handler, the service thread and the SendMessage handler can make this call.
BOOLEAN EnterServiceRegion(
    LPSERVICEDESC lpServiceDescriptor
);
lpServiceDescriptor 
TRUE 
FALSE 
E_CONTEXT 0x0005 
E_EXIST 0x0006 
lpServiceDescriptor parameter is not a pointer to a valid SERVICEDESC structure. 
E_TYPE 0x8002 
E_NUC_BAD_BUF 0x80E2 
lpControlBuffer parameter is not a valid pointer. | Versions | Defined in | Include | Link to | 
|---|---|---|---|
| INtime 3.0 | intime/rt/include/rtserv.h | rtserv.h | rtserv.lib | 
RT Service system calls, ExitServiceRSegion SendMessage, SERVICEDESC