Operating Systems – CSCI 402 Ch 6: File Systems http://merlot.usc.edu/william/usc/ 43 321 0 Copyright ý . Operating Systems – CSCI 402 Memory Disk Disk 44 321 0 Copyright ý . Cheng resides on disk (or alternatives) survives software and hardware crashes (including loss of disk?) Quick, easy, and efficient satisfies needs of most applications how […]
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Operating Systems – CSCI 402 Modified Program int nprimes; // in bss region int *prime; // in bss region int main(int argc, char *argv[]) { // in stack int i; // in stack int current = 2; // in stack nprimes = atoi(argv[1]); prime = (int*)malloc(nprimes*sizeof(int)); prime[0] = current; for (i=1; i
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Functional Programming The key idea: Solving problems using functions But, don’t all programming languages allow you to write functions? Yes, but they provide only calls for functions and not a functional paradigm. What is the difference? 1 Functional Programming So, what is functional programming? • Like mathematical functions, the functions we write should depend only
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A Simple OS Structure Review of “Computer Organization” Address Space Operating Systems – CSCI 402 text (code) data dynamic (heap) stack x86 Processor Bus idx regs EIP ESP EBP … seg regs CS SS … gen regs EAX EBX … other flags … 32 A0-A31 32 D0-D31 RD WR LOCK INT interrupt enabled processor mode
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Operating Systems – CSCI 402 Intel x86: Subroutine Code (2) local variables (8 bytes) saved registers (empty) ebp eip args sub: pushl %ebp movl %esp, %ebp subl $8, %esp movl $1, -4(%ebp) movl $0, -8(%ebp) movl -4(%ebp), %ecx movl -8(%ebp), %eax beginloop: cmpl 12(%ebp), %eax jge endloop imull 8(%ebp), %ecx addl $1, %eax jmp beginloop
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Operating Systems – CSCI 402 5.2 Interrupts 32 321 0 Copyright ý . Systems – CSCI 402 Interrupt Handling – Overview Interrupt Handling Deferred Work Directed Processing APCs Signals Interrupts Threads Thread preemption 33 321 0 Copyright ý . Cheng 3) an interrupt handler running on the same processor that accesses the same data structure
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Operating Systems – CSCI 402 3.4 Linking & Loading Static Linking & Loading Shared Libraries 29 321 0 Copyright ý . Systems – CSCI 402 Remember This? eip args local variables saved registers ebp main: pushl %ebp movl %esp, %ebp pushl %esi pushl %edi subl $8, %esp … pushl $1 movl -12(%ebp), %eax pushl %eax
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In real life, “synchronization” means that you want to do things at the same time In computer science, “synchronization” could meant the above, OR, it means that you want to prevent do things at the same time 321 0 Operating Systems – CSCI 402 2.2.3 Synchronization 24 Copyright ý . Systems – CSCI 402 Mutual
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8/11/21 Hints for drawing an FSM. Consider Q6 in the tutorial: Construct a deterministic FSM that recognizes the set of all bit strings that contain the string 101. 1. See what the input values are – in this case 0 and 1. In the previous example, it is the alphabets 1 2. See what the
SOFT3410 Tutorial 7 Atomics You have a quiz today and we will look into atomics Question 1: Atomic Operations, Counting and Stacks As we have noted prior, race conditions occur when we have more than one thread mutating shared memory. Atomics actually allow us to deal with this situation by making the write visible to
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