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Lec26-TSL & Priority Inversion

Lec26-TSL & Priority Inversion - National University of...

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Operating System Operating System Spring 09 Spring 09 National University National University of Computer & Emerging Sciences of Computer & Emerging Sciences Lec26-TSL & Priority Inversion Lec26-TSL & Priority Inversion Prepared by Prepared by Uzma Maroof Uzma Maroof [email protected] [email protected]
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2 Reference Reference Modern Operating System Andrew S. Tanenbaum 2 nd edition 2.3 Interprocess communications Operating System Concepts Silberschatz 6 th Edition Chapter 7
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3 Hardware Solutions Hardware Solutions Disabling/Enabling Interrupts Fetch Next Instruction Execute Instruction Check for Interrupt: Process Interrupt Start Halt Decode Instruction No Interrupt Checking No Context Switching This solution is dangerous It will not work if we have multiple CPUs Since, the Disable Interrupt instruction will execute on only one CPU Rest of the CPUs, will continue checking the interrupts
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4 Software Lock Software Lock Process 1 1.while (FLAG == FALSE); 2.FLAG = FALSE; 4.FLAG = TRUE; 5.noncritical_section(); Process 2 1.while (FLAG == FALSE); 2.
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