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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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CreateWaitableTimer
[New - Windows NT]
The CreateWaitableTimer function creates a "waitable" timer object.
HANDLE CreateWaitableTimer(
LPSECURITY_ATTRIBUTES lpTimerAttributes,
| // pointer to security attributes
| BOOL bManualReset,
| // flag for manual reset state
| LPCTSTR lpTimerName
| // pointer to timer object name
| );
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Parameters
lpTimerAttributes
Pointer to a SECURITY_ATTRIBUTES structure that specifies a security descriptor for the new timer object and
determines whether child processes can inherit the returned handle. If lpTimerAttributes is NULL, the timer object gets a default security descriptor and the handle
cannot be inherited.
bManualReset
Specifies the timer type. If bManualReset is TRUE, the timer is a manual-reset notification timer. Otherwise, the timer
is a synchronization timer.
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.
If the string specified in the lpTimerName parameter matches the name of an existing named timer object, the call
returns successfully and the GetLastError function returns ERROR_ALREADY_EXISTS.
If lpTimerName is NULL, the timer object is created without a name.
If lpTimerName matches the name of an existing event, semaphore, mutex, or file-mapping
object, the function fails and GetLastError returns ERROR_INVALID_HANDLE. This occurs because event, semaphore, mutex,
file-mapping, and waitable-timer objects share the same name space.
Return Values
If the function succeeds, the return value is a handle to the timer object. If
the named timer object exists before the function call, GetLastError returns ERROR_ALREADY_EXISTS. Otherwise, GetLastError returns zero.
If the function fails, the return value is NULL. To get extended error
information, call GetLastError.
Remarks
The handle returned by CreateWaitableTimer is created with the TIMER_ALL_ACCESS access right. This handle can be used in
any function that requires a handle to a timer object.
Any thread of the calling process can specify the timer object handle in a
call to one of the wait functions.
Multiple processes can have handles to the same timer object, enabling use of
the object for interprocess synchronization.
- A process created by the CreateProcess function can inherit a handle to a timer object if the lpTimerAttributes parameter of CreateWaitableTimer enables inheritance.
- A process can specify the timer object handle in a call to the DuplicateHandle function. The resulting handle can be used by another process.
- A process can specify the name of a timer object in a call to the OpenWaitableTimer or CreateWaitableTimer 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, DuplicateHandle, FILETIME, OpenWaitableTimer, SECURITY_ATTRIBUTES, SetWaitableTimer
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