PPT-CMPT 225 Memory and C++ Pointers

Outline C objects and memory C primitive types and memory Note primitive types int long float double char January 2010 Greg Mori 2 Dynamic Memory Example from cmpt2252stack Java. MODIFIED2013 Louisiana Applicationsaresubjectrevisionand acceptable) 9643AvenueSuite121BatonRouge,708091433(225)9256291(225)9256292 MODIFIED2013SectionPersonalInformation Opentheappropriateapplication MPI and C-Language Seminars 2010. Seminar . Plan (1/3). Aim:. Introduce the ‘C’ Programming Language.. Plan to cover:. Basic C, and programming techniques needed for HPC coursework.. C-bindings for the Message Passing Interface (MPI).. We’ll talk about today. Pointers. Arrays. Strings. Classes. “new” operator. Pointers. Stores the memory address where the data is stored. int. * . numberPointer. ;. Can access the data that is pointed to with *. CSE 2451. Rong. Shi. Language comparison. C has pointers. Java has references. C++ has pointers . and . references. Pointers. Values of variables are stored in memory, at a particular location. A location is identified and referenced with an address. Phase: Design. Janice Regan, 2008. 2. Map of design phase. DESIGN. HIGH LEVEL. DESIGN. Modularization. User Interface. Module Interfaces. Data. . Persistance. Subsystem. User Manual. architecture. Arrays. Pointers and Dynamic Memory. Pointer: is the memory address of a variable. Memory address: at byte level. Example:. The integer . i. is located at . m. emory address 990.. Pointer Variables. C. ++ . Memory Ordering Issues. Maged Michael. Facebook NY. Dagstuhl. , 21-25 November 2016. Maged . Michael. , Hazard Pointers: Safe Memory Reclamation for Lock-Free . Objects..  . IEEE Transactions on Parallel and Distributed Systems. CSC215. Lecture. Outline. Pointer to Pointer. Pointer Array. Strings Array. Multidimensional Array. void Pointers. Incomplete Types. Pointer to Function . Array vs. Pointer. #include <stdio.h>. 1. Pointers in Wonderland. The name of the song is called ‘. Haddock’s Eyes’.” . “Oh, that’s the name of the song, is it?” Alice said, trying to feel interested. “No, you don’t understand,” the Knight said, looking a little vexed. “That’s what the name of the song is . . Operating Systems. Processes. Multiprogramming. When multiple programs share the same processor . An example of . pseudoparallelism. Processes share processor (each get a short turn) so that in a perceptible length of time it appears processes run in parallel . . Mutual Exclusion. © Janice Regan, CMPT 300, 2007-2016 . 1. Implementation. Now we have the basic ideas we need. How do we actually implement mutual exclusion?. There are several approaches. Interrupt disabling. Define wild pointers. See how wild pointers caus. e problems. Sometimes you’re lucky; other times, you’re not…. Review the steps for avoiding wild pointers. Wild pointers. Uninitialized local or member variables can cause problems. The Desired Brand Effect Stand Out in a Saturated Market with a Timeless Brand Objectives. Determine the running time of simple algorithms. Best case. Average case. Worst case. Profile algorithms. Understand O notation's mathematical basis. Use O notation to measure running time.