CLR FUNDAMENTALS in .NET framework

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2 CLR FUNDAMENTALS
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To increase the reliability of code, a code isolation (or separation) layer must exist This isolation layer needs to guarantee that code running within one isolation boundary cannot adversely affect another piece of code running in a different isolation layer If this guarantee was not met, one piece of badly behaved code could easily take down either other applications or the entire system In other words, this isolation layer exists to improve the stability and reliability of the system Windows implements this isolation mechanism through the notion of a process All executable code, data, and other resources are self contained within the process with limited access to other processes running on the system (unless enough privileges are held) NET applications also execute within the confines of a process for the same reason that native code applications do However, NET takes it one step further and introduces another logical-isolation layer called the application domain Figure 2-4 shows a high-level overview of the relationship between a process and application domains
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CLR Process Native Process System Domain Code Data Resources Etc MSIL Data Metadata Structures Etc Shared Domain MSIL Data Metadata Structures Etc Default Domain MSIL Data Metadata Structures Etc
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Figure 2-4 Processes and application domains
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Any given Windows process that hosts the CLR can have one or more application domains defined that contain the executable code, data, metadata structures, and resources In addition to the protection guarantees built in by the process, an application domain further introduces the following guarantees:
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Faulty code within an application domain cannot adversely affect code running in a different application domain within the same process Code running within an application domain cannot directly access resources in a different application domain Code-specific configurations can be configured on a per application domain basis For example, you can configure security-specific settings on a per application domain basis
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Quite often, the notion of an application domain is transparent to the application in the sense that most applications don t explicitly create any application domains Typically, the creation of new application domains is left to applications that require specific code be hosted within the same process, yet require a level of isolation To guarantee that the code being hosted doesn t take down other parts of the system, it is loaded into its own application domain For example, the Internet Information Server (IIS) can host multiple ASPNET pages, which can be configured to run in individual application domains within the same process For applications that do not explicitly create any application domains, the CLR (at load time) creates three application domains: system application domain, shared application domain, and the default application domain In other words, during runtime, the process hosting the CLR will always have at least three application domains (although non-explicitly created by the application itself) We can examine which application domains are present in a CLR-hosted process
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by using the native debuggers Let s start an instance of the 02simpleexe NET application under the debugger and use the dumpdomain command in the SOS debugger extension as illustrated in Listing 2-3 Listing 2-3 Using the dumpdomain command to show all application domains in 02simpleexe
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0:001> loadby sosdll mscorwks 0:001> !dumpdomain ----------------------------------------------System Domain: 7a3bc8b8 LowFrequencyHeap: 7a3bc8dc HighFrequencyHeap: 7a3bc934 StubHeap: 7a3bc98c Stage: OPEN Name: None ----------------------------------------------Shared Domain: 7a3bc560 LowFrequencyHeap: 7a3bc584 HighFrequencyHeap: 7a3bc5dc StubHeap: 7a3bc634 Stage: OPEN Name: None Assembly: 004647d0 ----------------------------------------------Domain 1: 0041fd40 LowFrequencyHeap: 0041fd64 HighFrequencyHeap: 0041fdbc StubHeap: 0041fe14 Stage: OPEN Name: 02Simpleexe Assembly: 004647d0 [C:\Windows\assembly\GAC_32\mscorlib\2000__b77a5c561934e089\mscorlibdll] ClassLoader: 00464868 SecurityDescriptor: 00458250 Module Name 790c2000 C:\Windows\assembly\GAC_32\mscorlib\2000__b77a5c561934e089\mscorlibdll Assembly: 0046d660 [C:\ADNDBin\02Simpleexe] ClassLoader: 0046d6f8 SecurityDescriptor: 0046d560 Module Name 003f2c3c C:\ADNDBin\02Simpleexe
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2 CLR FUNDAMENTALS
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As we can see from Listing 2-3, there are indeed three application domains in this process: System, Shared, and Domain 1 Domain 1 is the default domain and is named after the image itself (02simpleexe) The output for each of the application domains is described in the following list
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The pointer to the domain This pointer can be used as input to the dumpdomain command and it will limit output for the specified application domain only For example, if you issue the following command
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