Consider the following code (with line numbers): ! typedef struct lock_t (int flag; ) lock_t; void init (lock_t mutex) ( 11 12 13 15 // 0-> lock is available, 1 -> held mutex->flag = 0; void lock (lock_t *mutex) ( while (mutex->flag == 1) // TEST the flag ; // spin-wait (do nothing) mutex->flag = 1; // now SET it! } void unlock (lock_t mutex) ( mutex->flag = 0; This code is defective in that it allows two threads to enter a critical section at the same time. Please give me a sequence of operations where this might occur.

Consider the following code (with line numbers): ! typedef struct lock_t (int flag; ) lock_t; void init (lock_t mutex) ( 11 12 13 15 // 0-> lock is available, 1 -> held mutex->flag = 0; void lock (lock_t *mutex) ( while (mutex->flag == 1) // TEST the flag ; // spin-wait (do nothing) mutex->flag = 1; // now SET it! } void unlock (lock_t mutex) ( mutex->flag = 0; This code is defective in that it allows two threads to enter a critical section at the same time. Please give me a sequence of operations where this might occur.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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In the C programming language, if all function prototypes are listed at the top of your code, outside and above all functions, you do not need to worry about the order of the function definitions within the code. True False
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