RequestWakeupLatency function
[RequestWakeupLatency is available for use in the operating systems specified in the Requirements section. It may be altered or unavailable in subsequent versions.]
Has no effect and returns STATUS_NOT_SUPPORTED. This function is provided only for compatibility with earlier versions of Windows.
Windows Server 2008 and Windows Vista: Has no effect and always returns success.
Syntax
BOOL WINAPI RequestWakeupLatency( _In_ LATENCY_TIME latency );
Parameters
- latency [in]
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The latency requirement for the time is takes to wake the computer. This parameter can be one of the following values.
Value Meaning - LT_LOWEST_LATENCY
- 1
PowerSystemSleeping1 state (equivalent to ACPI state S0 and APM state Working).
- LT_DONT_CARE
- 0
Any latency (default).
Return value
The return value is nonzero.
Remarks
The system uses the wake-up latency requirement when choosing a sleeping state. The latency is not guaranteed because wake-up time is determined by the hardware design of the particular computer.
To cancel a latency request, call RequestWakeupLatency with LT_DONT_CARE.
Requirements
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Minimum supported client |
Windows XP [desktop apps only] |
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Minimum supported server |
Windows Server 2003 [desktop apps only] |
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Header |
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Library |
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DLL |
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See also