Contexts 3 5 3 – Fast Window Switcher System
- Contexts 3 5 3 – Fast Window Switcher System Installation
- Contexts 3 5 3 – Fast Window Switcher System Download
- Contexts 3 5 3 – Fast Window Switcher System Diagram
What is Context Switching in Operating System?
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. With CLI IP Changer you can change IP-specific settings on the Windows Commandline with a very fast to type syntax. It is designed for efficient (lazy) people.For example the command to set IP, Subnet, Gateway and DNS1: ip 192.168.1.100/24 g 1 d1 1. SystemContext Switches/sec counter reports system wide context switches. Thread(Total)Context Switches/sec counter reports the total number of context switches generated per second by all threads Context switch overhead is low but if you see a much higher number at the same time as% processor time spikes then you can start troubleshooting.
In the Operating System, there are cases when you have to bring back the process that is in the running state to some other state like ready state or wait/block state. If the running process wants to perform some I/O operation, then you have to remove the process from the running state and then put the process in the I/O queue. Sometimes, the process might be using a round-robin scheduling algorithm where after every fixed time quantum, the process has to come back to the ready state from the running state. So, these process switchings are done with the help of Context Switching. In this blog, we will learn about the concept of Context Switching in the Operating System and we will also learn about the advantages and disadvantages of Context Switching. So, let's get started.
What is Context Switching?
A context switching is a process that involves switching of the CPU from one process or task to another. In this phenomenon, the execution of the process that is present in the running state is suspended by the kernel and another process that is present in the ready state is executed by the CPU.
It is one of the essential features of the multitasking operating system. The processes are switched so fastly that it gives an illusion to the user that all the processes are being executed at the same time.
But the context switching process involved a number of steps that need to be followed. You can't directly switch a process from the running state to the ready state. You have to save the context of that process. If you are not saving the context of any process P then after some time, when the process P comes in the CPU for execution again, then the process will start executing from starting. But in reality, it should continue from that point where it left the CPU in its previous execution. So, the context of the process should be saved before putting any other process in the running state.
A context is the contents of a CPU's registers and program counter at any point in time. Context switching can happen due to the following reasons:
- When a process of high priority comes in the ready state. In this case, the execution of the running process should be stopped and the higher priority process should be given the CPU for execution.
- When an interruption occurs then the process in the running state should be stopped and the CPU should handle the interrupt before doing something else.
- When a transition between the user mode and kernel mode is required then you have to perform the context switching.
Steps involved in Context Switching
The process of context switching involves a number of steps. The following diagram depicts the process of context switching between the two processes P1 and P2.
In the above figure, you can see that initially, the process P1 is in the running state and the process P2 is in the ready state. Now, when some interruption occurs then you have to switch the process P1 from running to the ready state after saving the context and the process P2 from ready to running state. The following steps will be performed:
- Firstly, the context of the process P1 i.e. the process present in the running state will be saved in the Process Control Block of process P1 i.e. PCB1.
- Now, you have to move the PCB1 to the relevant queue i.e. ready queue, I/O queue, waiting queue, etc.
- From the ready state, select the new process that is to be executed i.e. the process P2.
- Now, update the Process Control Block of process P2 i.e. PCB2 by setting the process state to running. If the process P2 was earlier executed by the CPU, then you can get the position of last executed instruction so that you can resume the execution of P2.
- Similarly, if you want to execute the process P1 again, then you have to follow the same steps as mentioned above(from step 1 to 4).
For context switching to happen, two processes are at least required in general, and in the case of the round-robin algorithm, you can perform context switching with the help of one process only.
The time involved in the context switching of one process by other is called the Context Switching Time.
Advantage of Context Switching
Context switching is used to achieve multitasking i.e. multiprogramming with time-sharing(learn more about multitasking from here). Multitasking gives an illusion to the users that more than one process are being executed at the same time. But in reality, only one task is being executed at a particular instant of time by a processor. Here, the context switching is so fast that the user feels that the CPU is executing more than one task at the same time.
The disadvantage of Context Switching
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. During that time, there is no useful work done by the CPU from the user perspective. So, context switching is pure overhead in this condition.
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-->Windows Forms support was added to .NET Core in version 3.0. This article lists breaking changes for Windows Forms by the .NET version in which they were introduced. If you're upgrading a Windows Forms app from .NET Framework or from a previous version of .NET Core (3.0 or later), this article applies to you.
The following breaking changes are documented on this page:
| Breaking change | Version introduced |
|---|---|
| Removed controls | 3.1 |
| CellFormatting event not raised if tooltip is shown | 3.1 |
| Control.DefaultFont changed to Segoe UI 9 pt | 3.0 |
| Modernization of the FolderBrowserDialog | 3.0 |
| SerializableAttribute removed from some Windows Forms types | 3.0 |
| AllowUpdateChildControlIndexForTabControls compatibility switch not supported | 3.0 |
| DomainUpDown.UseLegacyScrolling compatibility switch not supported | 3.0 |
| DoNotLoadLatestRichEditControl compatibility switch not supported | 3.0 |
| DoNotSupportSelectAllShortcutInMultilineTextBox compatibility switch not supported | 3.0 |
| DontSupportReentrantFilterMessage compatibility switch not supported | 3.0 |
| EnableVisualStyleValidation compatibility switch not supported | 3.0 |
| UseLegacyContextMenuStripSourceControlValue compatibility switch not supported | 3.0 |
| UseLegacyImages compatibility switch not supported | 3.0 |
.NET Core 3.1
Removed controls
Starting in .NET Core 3.1, some Windows Forms controls are no longer available.
Change description
Starting with .NET Core 3.1, various Windows Forms controls are no longer available. Replacement controls that have better design and support were introduced in .NET Framework 2.0. The deprecated controls were previously removed from designer toolboxes but were still available to be used.
The following types are no longer available:
Version introduced
3.1
Recommended action
Each removed control has a recommended replacement control. Refer to the following table:
| Removed control (API) | Recommended replacement | Associated APIs that are removed |
|---|---|---|
| ContextMenu | ContextMenuStrip | |
| DataGrid | DataGridView | DataGridCell, DataGridRow, DataGridTableCollection, DataGridColumnCollection, DataGridTableStyle, DataGridColumnStyle, DataGridLineStyle, DataGridParentRowsLabel, DataGridParentRowsLabelStyle, DataGridBoolColumn, DataGridTextBox, GridColumnStylesCollection, GridTableStylesCollection, HitTestType |
| MainMenu | MenuStrip | |
| Menu | ToolStripDropDown, ToolStripDropDownMenu | MenuItemCollection |
| MenuItem | ToolStripMenuItem | |
| ToolBar | ToolStrip | ToolBarAppearance |
| ToolBarButton | ToolStripButton | ToolBarButtonClickEventArgs, ToolBarButtonClickEventHandler, ToolBarButtonStyle, ToolBarTextAlign |
Category
Windows Forms
Affected APIs
CellFormatting event not raised if tooltip is shown
A DataGridView now shows a cell's text and error tooltips when hovered by a mouse and when selected via the keyboard. If a tooltip is shown, the DataGridView.CellFormatting event is not raised.
Change description
Prior to .NET Core 3.1, a DataGridView that had the ShowCellToolTips property set to true showed a tooltip for a cell's text and errors when the cell was hovered by a mouse. Tooltips were not shown when a cell was selected via the keyboard (for example, by using the Tab key, shortcut keys, or arrow navigation). If the user edited a cell, and then, while the DataGridView was still in edit mode, hovered over a cell that did not have the ToolTipText property set, a CellFormatting event was raised to format the cell's text for display in the cell.
To meet accessibility standards, starting in .NET Core 3.1, a DataGridView that has the ShowCellToolTips property set to true shows tooltips for a cell's text and errors not only when the cell is hovered, but also when it's selected via the keyboard. As a consequence of this change, the CellFormatting event is not raised when cells that don't have the ToolTipText property set are hovered while the DataGridView is in edit mode. The event is not raised because the content of the hovered cell is shown as a tooltip instead of being displayed in the cell.
Version introduced
3.1
Recommended action
Refactor any code that depends on the CellFormatting event while the DataGridView is in edit mode.
Category
Windows Forms
Affected APIs
None
.NET Core 3.0
Default control font changed to Segoe UI 9 pt
Change description
In .NET Framework, the Control.DefaultFont property was set to Microsoft Sans Serif 8 pt. The following image shows a window that uses the default font.
Starting in .NET Core 3.0, the default font is set to Segoe UI 9 pt (the same font as SystemFonts.MessageBoxFont). As a result of this change, forms and controls are sized about 27% larger to account for the larger size of the new default font. For example:
This change was made to align with Windows user experience (UX) guidelines.
Version introduced
3.0
Recommended action
Because of the change in the size of forms and controls, ensure that your application renders correctly.
To retain the original font, set your form's default font to Microsoft Sans Serif 8 pt. For example:
Category
- Windows Forms
Affected APIs
None.
Modernization of the FolderBrowserDialog
The FolderBrowserDialog control has changed in Windows Forms applications for .NET Core.
Change description
In the .NET Framework, Windows forms uses the following dialog for the FolderBrowserDialog control:
In .NET Core 3.0, Windows Forms uses a newer COM-based control that was introduced in Windows Vista:
Version introduced
3.0
Recommended action
The dialog will be upgraded automatically.
If you desire to retain the original dialog, set the FolderBrowserDialog.AutoUpgradeEnabled property to false before showing the dialog, as illustrated by the following code fragment:
Category
Windows Forms
Affected APIs
SerializableAttribute removed from some Windows Forms types
Contexts 3 5 3 – Fast Window Switcher System Installation
The SerializableAttribute has been removed from some Windows Forms classes that have no known binary serialization scenarios.
Change description
The following types are decorated with the SerializableAttribute in .NET Framework, but the attribute has been removed in .NET Core:
System.InvariantComparerSystem.ComponentModel.Design.Serialization.CodeDomComponentSerializationService.CodeDomSerializationStoreSystem.Resources.ResXNullRefSystem.Resources.ResXDataNodeSystem.Resources.ResXFileRefSystem.Windows.Forms.NativeMethods.MSOCRINFOSTRUCTSystem.Windows.Forms.NativeMethods.MSG
Historically, this serialization mechanism has had serious maintenance and security concerns. Maintaining SerializableAttribute on types means those types must be tested for version-to-version serialization changes and potentially framework-to-framework serialization changes. This makes it harder to evolve those types and can be costly to maintain. These types have no known binary serialization scenarios, which minimizes the impact of removing the attribute.
For more information, see Binary serialization.
Version introduced
3.0
Recommended action
Update any code that may depend on these types being marked as serializable.
Category
Windows Forms
Affected APIs
- None
AllowUpdateChildControlIndexForTabControls compatibility switch not supported
The Switch.System.Windows.Forms.AllowUpdateChildControlIndexForTabControls compatibility switch is supported in Windows Forms on .NET Framework 4.6 and later versions but is not supported on .NET Core or .NET 5.0 and later.
Change description
Contexts 3 5 3 – Fast Window Switcher System Download
In .NET Framework 4.6 and later versions, selecting a tab reorders its control collection. The Switch.System.Windows.Forms.AllowUpdateChildControlIndexForTabControls compatibility switch allows an application to skip this reordering when this behavior is undesirable.
In .NET Core and .NET 5.0 and later, the Switch.System.Windows.Forms.AllowUpdateChildControlIndexForTabControls switch is not supported.
Version introduced
3.0
Recommended action
Remove the switch. The switch is not supported, and no alternative functionality is available.
Category
Windows Forms
Affected APIs
- None
DomainUpDown.UseLegacyScrolling compatibility switch not supported
The Switch.System.Windows.Forms.DomainUpDown.UseLegacyScrolling compatibility switch, which was introduced in .NET Framework 4.7.1, is not supported in Windows Forms on .NET Core or .NET 5.0 and later.
Change description
Starting with .NET Framework 4.7.1, the Switch.System.Windows.Forms.DomainUpDown.UseLegacyScrolling compatibility switch allowed developers to opt-out of independent DomainUpDown.DownButton() and DomainUpDown.UpButton() actions. The switch restored the legacy behavior, in which the DomainUpDown.UpButton() is ignored if context text is present, and the developer is required to use DomainUpDown.DownButton() action on the control before the DomainUpDown.UpButton() action. For more information, see <AppContextSwitchOverrides> element.
In .NET Core and .NET 5.0 and later, the Switch.System.Windows.Forms.DomainUpDown.UseLegacyScrolling switch is not supported.
Version introduced
3.0
Recommended action
Remove the switch. The switch is not supported, and no alternative functionality is available.
Category
Windows Forms
Affected APIs
DoNotLoadLatestRichEditControl compatibility switch not supported
The Switch.System.Windows.Forms.UseLegacyImages compatibility switch, which was introduced in .NET Framework 4.7.1, is not supported in Windows Forms on .NET Core or .NET 5.0 and later.
Change description
In .NET Framework 4.6.2 and previous versions, the RichTextBox control instantiates the Win32 RichEdit control v3.0, and for applications that target .NET Framework 4.7.1, the RichTextBox control instantiates RichEdit v4.1 (in msftedit.dll). The Switch.System.Windows.Forms.DoNotLoadLatestRichEditControl compatibility switch was introduced to allow applications that target .NET Framework 4.7.1 and later versions to opt out of the new RichEdit v4.1 control and use the old RichEdit v3 control instead.
In .NET Core and .NET 5.0 and later versions, the Switch.System.Windows.Forms.DoNotLoadLatestRichEditControl switch is not supported. Only new versions of the RichTextBox control are supported.
Version introduced
3.0
Recommended action
Remove the switch. The switch is not supported, and no alternative functionality is available.
Category
Windows Forms
Affected APIs
DoNotSupportSelectAllShortcutInMultilineTextBox compatibility switch not supported
The Switch.System.Windows.Forms.DoNotSupportSelectAllShortcutInMultilineTextBox compatibility switch, which was introduced in .NET Framework 4.6.1, is not supported in Windows Forms on .NET Core and .NET 5.0 and later.
Change description
Starting with .NET Framework 4.6.1, selecting the Ctrl + A shortcut key in a TextBox control selected all text. In .NET Framework 4.6 and previous versions, selecting the Ctrl + A shortcut key failed to select all text if the Textbox.ShortcutsEnabled and TextBox.Multiline properties were both set to true. The Switch.System.Windows.Forms.DoNotSupportSelectAllShortcutInMultilineTextBox compatibility switch was introduced in .NET Framework 4.6.1 to retain the original behavior. For more information see TextBox.ProcessCmdKey.
In .NET Core and .NET 5.0 and later versions, the Switch.System.Windows.Forms.DoNotSupportSelectAllShortcutInMultilineTextBox switch is not supported.
Version introduced
3.0
Contexts 3 5 3 – Fast Window Switcher System Diagram
Recommended action
Remove the switch. The switch is not supported, and no alternative functionality is available.
Category
Windows Forms
Affected APIs
- None
DontSupportReentrantFilterMessage compatibility switch not supported
The Switch.System.Windows.Forms.DontSupportReentrantFilterMessage compatibility switch, which was introduced in .NET Framework 4.6.1, is not supported in Windows Forms on .NET Core and .NET 5.0 and later.
Change description
Starting with the .NET Framework 4.6.1, the Switch.System.Windows.Forms.DontSupportReentrantFilterMessage compatibility switch addresses possible IndexOutOfRangeException exceptions when the Application.FilterMessage message is called with a custom IMessageFilter.PreFilterMessage implementation. For more information, see Mitigation: Custom IMessageFilter.PreFilterMessage Implementations.
In .NET Core and .NET 5.0 and later, the Switch.System.Windows.Forms.DontSupportReentrantFilterMessage switch is not supported.
Version introduced
3.0
Recommended action
Remove the switch. The switch is not supported, and no alternative functionality is available.
Category
Windows Forms
Affected APIs
EnableVisualStyleValidation compatibility switch not supported
The Switch.System.Windows.Forms.EnableVisualStyleValidation compatibility switch is not supported in Windows Forms on .NET Core or .NET 5.0 and later.
Change description
In .NET Framework, the Switch.System.Windows.Forms.EnableVisualStyleValidation compatibility switch allowed an application to opt out of validation of visual styles supplied in a numeric form.
In .NET Core and .NET 5.0 and later, the Switch.System.Windows.Forms.EnableVisualStyleValidation switch is not supported.
Version introduced
3.0
Recommended action
Remove the switch. The switch is not supported, and no alternative functionality is available.
Category
Windows Forms
Affected APIs
- None
UseLegacyContextMenuStripSourceControlValue compatibility switch not supported
The Switch.System.Windows.Forms.UseLegacyContextMenuStripSourceControlValue compatibility switch, which was introduced in .NET Framework 4.7.2, is not supported in Windows Forms on .NET Core or .NET 5.0 and later.
Change description
Starting with .NET Framework 4.7.2, the Switch.System.Windows.Forms.UseLegacyContextMenuStripSourceControlValue compatibility switch allows the developer to opt out of the new behavior of the ContextMenuStrip.SourceControl property, which now returns a reference to the source control. The previous behavior of the property was to return null. For more information, see <AppContextSwitchOverrides> element.
In .NET Core and .NET 5.0 and later, the Switch.System.Windows.Forms.UseLegacyContextMenuStripSourceControlValue switch is not supported.
Version introduced
3.0
Recommended action
Remove the switch. The switch is not supported, and no alternative functionality is available.
Category
Windows Forms
Affected APIs
UseLegacyImages compatibility switch not supported
The Switch.System.Windows.Forms.UseLegacyImages compatibility switch, which was introduced in .NET Framework 4.8, is not supported in Windows Forms on .NET Core or .NET 5.0 and later.
Change description
Starting with .NET Framework 4.8, the Switch.System.Windows.Forms.UseLegacyImages compatibility switch addressed possible image scaling issues in ClickOnce scenarios in high DPI environments. When set to true, the switch allows the user to restore legacy image scaling on high DPI displays whose scale is set to greater than 100%. For more information, see .NET Framework 4.8 Release Notes on GitHub.
In .NET Core and .NET 5.0 and later, the Switch.System.Windows.Forms.UseLegacyImages switch is not supported.
Version introduced
3.0
Recommended action
Remove the switch. The switch is not supported, and no alternative functionality is available.
Category
Windows Forms
Affected APIs
- None