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25 Thread Basics
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Note To keep the overall system running smoothly, a process cannot run in the Realtime priority
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class unless the user has the Increase Scheduling Priority privilege . Any user designated as an administrator or a power user has this privilege by default .
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Once you select a priority class, you should stop thinking about how your application relates to other applications and just concentrate on the threads within your application . Windows supports seven relative thread priorities: Idle, Lowest, Below Normal, Normal, Above Normal, Highest, and Time-Critical . These priorities are relative to the process s priority class . Again, Normal relative thread priority is the default, and it is therefore the most common . So, to summarize, your process is a member of a priority class and within that process you assign thread priorities that are relative to each other . You ll notice that I haven t said anything about priority levels 0 through 31 . Application developers never work with priority levels directly . Instead, the system maps the process s priority class and a thread s relative priority to a priority level . Table 25-1 shows how the process s priority class and the thread s relative priority maps to priority levels .
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TABLE 25-1
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How Process Priority Class and Relative Thread Priorities Map to Priority
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Levels
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Relative Thread Priority Idle
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Time-Critical Highest Above Normal Normal Below Normal Lowest Idle 15 6 5 4 3 2 1
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Process Priority Class Below Normal
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15 8 7 6 5 4 1
Normal
15 10 9 8 7 6 1
Above Normal
15 12 11 10 9 8 1
High
15 15 14 13 12 11 1
Realtime
31 26 25 24 23 22 16
For example, a Normal thread in a Normal process is assigned a priority level of 8 . Because most processes are of the Normal priority class and most threads are of Normal thread priority, most threads in the system have a priority level of 8 . If you have a Normal thread in a high-priority process, the thread will have a priority level of 13 . If you change the process s priority class to Idle, the thread s priority level becomes 4 . Remember that thread priorities are relative to the process s priority class . If you change a process s priority class, the thread s relative priority will not change, but its priority number will .
Part V
Threading
Notice that the table does not show any way for a thread to have a priority level of 0 . This is because the 0 priority is reserved for the zero page thread and the system does not allow any other thread to have a priority of 0 . Also, the following priority levels are not obtainable: 17, 18, 19, 20, 21, 27, 28, 29, or 30 . If you are writing a device driver that runs in kernel mode, you can obtain these levels; a user-mode application cannot . Also note that a thread in the Realtime priority class can t be below priority level 16 . Likewise, a thread in a priority class other than Realtime cannot be above 15 . Note The concept of a process priority class confuses some people . They think that this somehow means that Windows schedules processes . However, Windows never schedules processes; Windows only schedules threads . The process priority class is an abstract concept that Microsoft created to help you rationalize how your application compares with other running applications; it serves no other purpose .
Important It is best to lower a thread s priority instead of raising another thread s priority .
You would normally lower a thread s priority if that thread was going to execute a long-running compute-bound task like compiling code, spell checking, spreadsheet recalculations, etc . You would raise a thread s priority if the thread needs to respond to something very quickly and then run for a very short period of time and go back to its wait state . High-priority threads should be waiting for something most of their life so that they do not affect the responsiveness of the whole system . The Windows Explorer thread that responds to the user pressing the Windows key on the keyboard is an example of a high-priority thread . When the user presses this key, Windows Explorer preempts other lower-priority threads immediately and displays its menu . As the user navigates the menu, Windows Explorer s thread responds to each keystroke quickly, updates the menu, and then stops running until the user continues navigating the menu .
Normally, a process is assigned a priority class based on the process that starts it running . And most processes are started by Windows Explorer, which spawns all its child processes in the Normal priority class . Managed applications are not supposed to act as though they own their own processes; they are supposed to act as though they run in an AppDomain, so managed applications are not supposed to change their process s priority class because this would affect all code running in the process . For example, many ASP .NET applications run in a single process, with each application in its own AppDomain . The same is true for Silverlight applications, which run in an Internet browser process, and managed stored procedures, which run inside the Microsoft SQL Server process . On the other hand, your application can change the relative thread priority of its threads by setting Thread s Priority property, passing it one of the five values (Lowest, BelowNormal, Normal, AboveNormal, or Highest) defined in the ThreadPriority enumerated type . However, just as Windows has reserved the priority level 0 and the real-time range for itself, the CLR reserves the Idle and Time-Critical priority levels for itself . Today, the CLR has no threads that run at Idle priority level, but this could change in the future . However, the
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