The disadvantage of context switching is that it requires some time for context switching i.e. The context switching time. Time is required to save the context of one process that is in the running state and then getting the context of another process that is about to come in the running state. Nearly 10 years ago, I built systems running Windows NT 3.1 on a 90Mhz Pentium (yes, the original Pentium) that could display full resolution live NTSC video on the screen and sustain 10's of megabytes/second of I/O with external devices, all without a single realtime priority thread (yes, there was custom hardware and custom device drivers. Video editor enhancer v1 0 71. Today 8-7-2016, I put Screen Hunter on my new win 8.1, ( a new back up desk top ) Missed the free win 10 upgrade. Searched google, tried 3. When a processor becomes available, the system performs a context switch. The steps in a context switch are: Save the context of the thread that just finished executing. Place the thread that just finished executing at the end of the queue for its priority. Find the highest priority queue that contains ready threads. Remove the thread at the head of the queue, load its context,.
- Contexts 3 6 1 – Fast Window Switcher Systems Manual
- Contexts 3 6 1 – Fast Window Switcher Systems Diagram
- Contexts 3 6 1 – Fast Window Switcher Systems Wiring
This class is the event type class for context switch events.
The following syntax is simplified from MOF code.
Syntax
Members
The CSwitch class has these types of members:
Properties
The CSwitch class has these properties.
NewThreadId
Data type: uint32
Access type: Read-only
Qualifiers: WmiDataId(1), Format('x') Tune sweeper 4 22 29.
New thread ID after the switch.
NewThreadPriority
Data type: sint8
Access type: Read-only
Qualifiers: WmiDataId(3)
Thread priority of the new thread.
NewThreadWaitTime
Data type: uint32
Access type: Read-only
Qualifiers: WmiDataId(11), Format('x')
Wait time for the new thread.
OldThreadId
Data type: uint32
Access type: Read-only
Qualifiers: WmiDataId(2), Format('x')
Previous thread ID.
OldThreadPriority
Data type: sint8
Access type: Read-only
Qualifiers: WmiDataId(4)
Thread priority of the previous thread.
OldThreadState
Data type: sint8
Access type: Read-only
Qualifiers: WmiDataId(9)
State of the previous thread. The following are the possible state values:
Contexts 3 6 1 – Fast Window Switcher Systems Manual
State | Description |
---|---|
0 | Initialized |
1 | Ready |
2 | Running |
3 | Standby |
4 | Terminated |
5 | Waiting |
6 | Transition |
7 | DeferredReady (added for Windows Server 2003) |
OldThreadWaitIdealProcessor
Contexts 3 6 1 – Fast Window Switcher Systems Diagram
Data type: sint8
Access type: Read-only
Qualifiers: WmiDataId(10), Format('x')
Bettertouchtool 2 312 – customize multi touch trackpad gestures copy. Ideal wait time of the previous thread.
OldThreadWaitMode
Data type: sint8
Access type: Read-only
Qualifiers: WmiDataId(8)
Contexts 3 6 1 – Fast Window Switcher Systems Wiring
Wait mode for the previous thread. The following are the possible values:
State | Description |
---|---|
0 | KernelMode |
1 | UserMode |
OldThreadWaitReason
Data type: sint8
Access type: Read-only
Qualifiers: WmiDataId(7)
Wait reason for the previous thread. The following are the possible values:
State | Description |
---|---|
0 | Executive |
1 | FreePage |
2 | PageIn |
3 | PoolAllocation |
4 | DelayExecution |
5 | Suspended |
6 | UserRequest |
7 | WrExecutive |
8 | WrFreePage |
9 | WrPageIn |
10 | WrPoolAllocation |
11 | WrDelayExecution |
12 | WrSuspended |
13 | WrUserRequest |
14 | WrEventPair |
15 | WrQueue |
16 | WrLpcReceive |
17 | WrLpcReply |
18 | WrVirtualMemory |
19 | WrPageOut |
20 | WrRendezvous |
21 | WrKeyedEvent |
22 | WrTerminated |
23 | WrProcessInSwap |
24 | WrCpuRateControl |
25 | WrCalloutStack |
26 | WrKernel |
27 | WrResource |
28 | WrPushLock |
29 | WrMutex |
30 | WrQuantumEnd |
31 | WrDispatchInt |
32 | WrPreempted |
33 | WrYieldExecution |
34 | WrFastMutex |
35 | WrGuardedMutex |
36 | WrRundown |
37 | MaximumWaitReason |
PreviousCState
Data type: uint8
Access type: Read-only
Qualifiers: WmiDataId(5)
The index of the C-state that was last used by the processor. A value of 0 represents the lightest idle state with higher values representing deeper C-states.
Reserved
Data type: uint32
Access type: Read-only
Qualifiers: WmiDataId(12)
Reserved.
SpareByte
Data type: sint8
Access type: Read-only
Qualifiers: WmiDataId(6)
Not used.
Remarks
These events produce a high volume of events.
Requirements
Requirement | Value |
---|---|
Minimum supported client | Windows Vista [desktop apps only] |
Minimum supported server | Windows Server 2008 [desktop apps only] |