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How to hold my VB NT service until the CPU usage stop hitting 100%

Posted on 2003-11-27
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Last Modified: 2010-05-03
I have a NT service created with VB (using NTSRV.OCX) which do a TIFF to PNG conversion on a given directory.

There are several other services installed on the same Win2k server which also do some disk write operations and they will take up 100% CPU usage for about 10 seconds once every 5 minutes.

Now, is there a way to hold my NT service from running if the CPU usage hits 100%? Maybe I can use a loop to scan the CPU usage before I do my image conversion? Or maybe a If Then statement or While loop...
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Question by:8831
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EDDYKT earned 500 total points
ID: 9831405
You can set the prioity to low so that if the system is busy, your task will not run

ie

Const THREAD_BASE_PRIORITY_IDLE = -15
Const THREAD_BASE_PRIORITY_LOWRT = 15
Const THREAD_BASE_PRIORITY_MIN = -2
Const THREAD_BASE_PRIORITY_MAX = 2
Const THREAD_PRIORITY_LOWEST = THREAD_BASE_PRIORITY_MIN
Const THREAD_PRIORITY_HIGHEST = THREAD_BASE_PRIORITY_MAX
Const THREAD_PRIORITY_BELOW_NORMAL = (THREAD_PRIORITY_LOWEST + 1)
Const THREAD_PRIORITY_ABOVE_NORMAL = (THREAD_PRIORITY_HIGHEST - 1)
Const THREAD_PRIORITY_IDLE = THREAD_BASE_PRIORITY_IDLE
Const THREAD_PRIORITY_NORMAL = 0
Const THREAD_PRIORITY_TIME_CRITICAL = THREAD_BASE_PRIORITY_LOWRT
Const HIGH_PRIORITY_CLASS = &H80
Const IDLE_PRIORITY_CLASS = &H40
Const NORMAL_PRIORITY_CLASS = &H20
Const REALTIME_PRIORITY_CLASS = &H100
Private Declare Function SetThreadPriority Lib "kernel32" (ByVal hThread As Long, ByVal nPriority As Long) As Long
Private Declare Function SetPriorityClass Lib "kernel32" (ByVal hProcess As Long, ByVal dwPriorityClass As Long) As Long
Private Declare Function GetThreadPriority Lib "kernel32" (ByVal hThread As Long) As Long
Private Declare Function GetPriorityClass Lib "kernel32" (ByVal hProcess As Long) As Long
Private Declare Function GetCurrentThread Lib "kernel32" () As Long
Private Declare Function GetCurrentProcess Lib "kernel32" () As Long
Private Sub Form_Load()
    'KPD-Team 2000
    'URL: http://www.allapi.net/
    'E-Mail: KPDTeam@Allapi.net
    Dim hThread As Long, hProcess As Long
    'retrieve the current thread and process
    hThread = GetCurrentThread
    hProcess = GetCurrentProcess
    'set the new thread priority to "lowest"
    SetThreadPriority hThread, THREAD_PRIORITY_LOWEST
    'set the new priority class to "idle"
    SetPriorityClass hProcess, IDLE_PRIORITY_CLASS
    'print some results
    Me.AutoRedraw = True
    Me.Print "Current Thread Priority:" + Str$(GetThreadPriority(hThread))
    Me.Print "Current Priority Class:" + Str$(GetPriorityClass(hProcess))
End Sub
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