RtOpenSemaphore
RtOpenSemaphore returns a handle of an existing named semaphore object.
Syntax
HANDLE RtOpenSemaphore( DWORD dwDesiredAccess, BOOL bInheritHandle, LPCTSTR lpName );
Parameters
DesiredAccess
Ignored.
bInheritHandle
This must be FALSE.
lpName
A pointer to a null-terminated string that names the semaphore to be opened. Name comparisons are case-sensitive.
Return Value
A handle to the semaphore object if the function succeeds, NULL if the function fails
To get extended error information, call GetLastError.
Remarks
RtOpenSemaphore enables multiple processes to open handles of the same semaphore object. The function succeeds only if some process has already created the semaphore by using RtCreateSemaphore. The calling process can use the returned handle in any function that requires a handle of a semaphore object, such as a wait function, subject to the limitations of the access specified in DesiredAccess.
Use RtCloseHandle to close the handle. The system closes the handle automatically when the process terminates. The semaphore object is destroyed when its last handle has been closed.
Requirements
Minimum Supported Version | RTX64 2013 |
Header | Rtapi.h |
Library | RtApi.lib (Windows), Rtx_Rtss.lib (RTSS) |
See Also: