Extend this implementation with a function int getexact (counter *c) which always returns the globally exact value of the counter rather than an approximation. typedef struct_counter_t ( int 14 .) counter_ti value; pthread mutex t lock; void init (counter_tc) { c->value = 0; Pthread_mutex_init (4e->lock, NULL); 1 void increment (counter_tc) { Pthread_mutex_lock (6c->lock); e->value** Pthread_mutex_unlock (6c->lock); void decrement (counter_tc) ( Pthread_mut ex lock (4e->lock); C->value-- Pthread nutex_unlock (4e->lock); 1 1 int get (counter_t c) { Pthread nut ex lock (4e->lock); int re- e->value; Pthread_mutex_unlock (40->lock); return re Time (seconds) sn 10 x Precise O Approximate Threads
Extend this implementation with a function int getexact (counter *c) which always returns the globally exact value of the counter rather than an approximation. typedef struct_counter_t ( int 14 .) counter_ti value; pthread mutex t lock; void init (counter_tc) { c->value = 0; Pthread_mutex_init (4e->lock, NULL); 1 void increment (counter_tc) { Pthread_mutex_lock (6c->lock); e->value** Pthread_mutex_unlock (6c->lock); void decrement (counter_tc) ( Pthread_mut ex lock (4e->lock); C->value-- Pthread nutex_unlock (4e->lock); 1 1 int get (counter_t c) { Pthread nut ex lock (4e->lock); int re- e->value; Pthread_mutex_unlock (40->lock); return re Time (seconds) sn 10 x Precise O Approximate Threads
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text:Extend this implementation with a function int getexact (counter *c)
which always returns the globally exact value of the counter rather than an
approximation.
I typedef struct _counter_ti
int
pthread mutex_t lock;
value;
. I counter_ti
• void init (counter t c) {
c->value 0
Pthread mutex_init (sc->lock, NULL);
void increment (counter_t c) {
Pthread mutex_lock (se->lock);
e->value
Pthread mutex_unlock (6c->lock);
14
void decrement (counter_t c)
17
Pthread mutex_lock (6c->lock);
e->value--
Pthread mutex_unlock (se->lock);
* int get (counter_t c)(
Pthread nutex_lock (se->lock);
int re - c->value,
Pthread mutex_unlock (ke->lock):
return re;
15
x Precise
O Approximate
10
Threads
(spuooos) ou
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