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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| No
| Win32s
| No
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| WinNT
| Platform Notes
| None
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OpenWaitableTimer
[New - Windows NT]
The OpenWaitableTimer function returns a handle to an existing named "waitable" timer object.
HANDLE OpenWaitableTimer(
DWORD dwDesiredAccess,
| // access flag
| BOOL bInheritHandle,
| // inherit flag
| LPCTSTR lpTimerName
| // pointer to timer object name
| );
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Parameters
dwDesiredAccess
Specifies the requested access to the timer object. For systems that support
object security, the function fails if the security descriptor of the specified
object does not permit the requested access for the calling process.
This parameter can be any combination of the following values:
Value
| Meaning
| TIMER_ALL_ACCESS
| Specifies all possible access rights for the timer object.
| TIMER_MODIFY_STATE
| Enables use of the timer handle in the SetWaitableTimer and CancelWaitableTimer functions to modify the timer's state.
| SYNCHRONIZE
| Enables use of the timer handle in any of the wait functions to wait for the timer's state to be signaled.
|
bInheritHandle
Specifies whether the returned handle is inheritable. If TRUE, a process
created by the CreateProcess function can inherit the handle; otherwise, the handle cannot be inherited.
lpTimerName
Points to a null-terminated string specifying the name of the timer object.
The name is limited to MAX_PATH characters and can contain any character except
the backslash path-separator character (\). Name comparison is case sensitive.
Return Value
If the function succeeds, the return value is a handle to the timer object.
If the function fails, the return value is NULL. To get extended error
information, call GetLastError.
Remarks
The OpenWaitableTimer function enables multiple processes to open handles to the same timer object.
The function succeeds only if some process has already created the timer using
the CreateWaitableTimer function. The calling process can use the returned handle in any function
that requires the handle of a timer object, such as the wait functions, subject to the limitations of the access specified in the dwDesiredAccess parameter.
The returned handle can be duplicated by using the DuplicateHandle function. Use the CloseHandle function to close the handle. The system closes the handle automatically when
the process terminates. The timer object is destroyed when its last handle has
been closed.
See Also
CancelWaitableTimer, CloseHandle, CreateProcess, CreateWaitableTimer, DuplicateHandle, SetWaitableTimer
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