Understanding Context Switching in Operating Systems
Explore the concept of context switching in operating systems, including processes, threads, hardware registers, and control blocks. Learn about practical examples in Linux and Windows environments for process management.
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Context Switch Process A Control Block Process B Control Block thread state Hardware Registers Threads Threads Core thread state A1 B1 A2 A3 R0 R1 SP RN SP A3 Stack B1 Stack CS 111 Lecture Notes: Threads, Processes, and Dispatching Slide 1
Context Switch Process A Control Block Process B Control Block thread state Hardware Registers Threads Threads Core thread state A1 B1 A2 A3 R0 R1 SP RN SP Saved Registers (all but SP) A3 Stack B1 Stack CS 111 Lecture Notes: Threads, Processes, and Dispatching Slide 2
Context Switch Process A Control Block Process B Control Block thread state Hardware Registers Threads Threads Core thread state A1 B1 A2 A3 R0 R1 SP RN SP SP A3 Stack B1 Stack CS 111 Lecture Notes: Threads, Processes, and Dispatching Slide 3
Context Switch Process A Control Block Process B Control Block thread state Hardware Registers Threads Threads Core thread state A1 B1 A2 A3 R0 R1 SP RN SP SP A3 Stack B1 Stack CS 111 Lecture Notes: Threads, Processes, and Dispatching Slide 4
Context Switch thread state Hardware Registers Threads Threads Core thread state A1 B1 A2 A3 R0 R1 RN SP Process A Control Block Process B Control Block SP A3 Stack B1 Stack CS 111 Lecture Notes: Threads, Processes, and Dispatching Slide 5
Linux Fork/Exec Example int pid = fork(); if (pid == 0) { execvp( ls , argv); } else { waitpid(pid, &status, options); }; Child process Parent process CS 111 Lecture Notes: Threads, Processes, and Dispatching Slide 6
Windows Process Creation BOOL CreateProcess( LPCTSTR lpApplicationName, LPTSTR lpCommandLine, LPSECURITY_ATTRIBUTES lpProcessAttributes, LPSECURITY_ATTRIBUTES lpThreadAttributes, BOOL bInheritHandles, DWORD dwCreationFlags, LPVOID lpEnvironment, LPCTSTR lpCurrentDirectory, LPSTARTUPINFO lpStartupInfo, LPPROCESS_INFORMATION lpProcessInformation ); WaitForSingleObject(lpProcessInformation->hProcess, INFINITE); CS 111 Lecture Notes: Threads, Processes, and Dispatching Slide 7
