Consider the following code (with line numbers):1 typedef struct_lock_t (int flag; } lock_t;2467301115void init (lock_t *mutex) {}// 0-> lock is available, 1 -> heldmutex->flag = 0;void lock (lock_t *mutex) (while (mutex->flag == 1) // TEST the flag; // spin-wait (do nothing)mutex-> flag = 1;}void unlock (lock_t *mutex) {mutex->flag = 0;// now SET it!This code is defective in that it allows two threads to enter a criticalsection at the same time. Please give me a sequence of operationswhere this might occur.

Threads refer to the smallest unit of a process that can be scheduled for execution by the operating…

Consider the following code (with line numbers): 1 typedef struct void init (lock_t mutex) { 4 S " 11 12 } 15 lock_t(int flag; ) lock_t; 7 • void lock (lock_t mutex) ( } // 0-> lock is available, 1 -> held mutex->flag = 0; 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): 1 typedef struct void init (lock_t mutex) { 4 S " 11 12 } 15 lock_t(int flag; ) lock_t; 7 • void lock (lock_t mutex) ( } // 0-> lock is available, 1 -> held mutex->flag = 0; 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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Concept explainers

Concept of Pointer Parameter

Pointers are the special variable that stores the variable address, instead of storing the variable value. Pointer is a powerful feature of a programming language. A pointer is mostly used to save memory space and improve execution time.

Question

Consider the following code (with line numbers):
1 typedef struct_lock_t (int flag; } lock_t;
2
4
6
7
30
11
15
void init (lock_t *mutex) {
}
// 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;
}
void unlock (lock_t *mutex) {
mutex->flag = 0;
// now SET it!
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.

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