More on Thread-Safe and Synchronization Strategies and Problems Shuaiwen Clarification from the previous lectures 2 Waitpid () What is the output of the program on the left? A. acbc B. bcac C. abcc D. bacc E. AorCorD void main() { if (fork() == 0) { printf(“a”); } else { printf(“b”); waitpid(-1, NULL, 0); } printf(“c”); […]
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10/6/21 The Parsing Process COMP712 Programming Languages AUT 1 A typical view of the compilation process: parsing Your Program Lexical Analyser Syntax Analyser What is generated? Symbol Table Parse Tree Tokens = terminal words 2 12 A typical view of the compilation process: parsing What happens next? Code generation Interpretation i.e walk the tree 3
COMP712 Tutorial #5: Lexical Analysis 1. Identify all the terminal words of Lisp in the following Lisp program. (defun funny (n) (cond ((zerop n) 1) ( t (* n (funny (1- n)))))) s.leftbracket, s.defun, s.rightbracket, s.cond, s.zerop, s.number, s.t, s.*, s.1-. 2. Why is it a good idea to pre-hash reserved words in the symbol
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Binary Representations Integers • High-level language program (in C) swap (int v[], int k) { int temp = v[k]; v[k] = v[k+1]; v[k+1] = temp; • Assembly language program (for MIPS) swap: sll $2, $5, 2 add $2, $4,$2 C compiler The Big Picture } lw $15, lw $16, sw $16, sw $15, jr $31
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along with what sort of access is allowed (i.e., the “what”) A security principal is normally a user or a group of users a file typically contains two pieces of information which user owns the file (uid) which group owns the file (gid) each running process can have several security principals associated with it for
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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 Ch 3: Basic Concepts http://merlot.usc.edu/william/usc/ 1 321 0 Copyright ý . ¡¯s Next? So far, we have talked about abstractions processes, files, threads stuff at the user level We are not ready to talk about the OS yet Next step is something in between Abstractions (processes, files, threads) context for
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7/13/21 COMP712 Programming Languages Lecture 1: Introduction Albert Yeap WT410 AUT University 2021 What is this course about? 1 COMP712: Programming Languages Your paper descriptor shows: • Foundations of programming languages • Principles of compilers and interpreters • Runtimes and virtual machines • Programming paradigms What make languages tick! 2 12 A programming language is
COMP273 McGill 1 Decisions in MIPS Assembly Language if else . .. Assembly in Matrix Reloaded COMP273 McGill 3 Assembly in Matrix Reloaded • • addi $s1, $s0, 4 lw $s6, 0($s1) these 2 are the same thing All instructions we’ve seen so far allow us to manipulate data. To build a computer we must
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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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