Consider the following multi-threaded C code. 1: /* Waits until bar ->n threads have called barrier 2: *before allowing any thread to continue 3: */ 4: void barrier (barrier_t * bar ) { 5: lock (& bar -> mutex); 6: bar -> count ++; 7: if (bar> count == bar ->n) { 8: bar -> count = 0; // reset barrier 9: cond_signal (& bar ->cv); 10: unlock (& bar -> mutex); 11: return; 12:] 13: while (bar -> count < bar ->n) { 14: cond wait (& bar ->cv, &bar -> mutex); 15: } Identify all bugs, if any exist. A. Lines 5, 10, and 16 B. Line 9 C. Lines 9 and 13 D. Line 13 E. No bugs
Consider the following multi-threaded C code. 1: /* Waits until bar ->n threads have called barrier 2: *before allowing any thread to continue 3: */ 4: void barrier (barrier_t * bar ) { 5: lock (& bar -> mutex); 6: bar -> count ++; 7: if (bar> count == bar ->n) { 8: bar -> count = 0; // reset barrier 9: cond_signal (& bar ->cv); 10: unlock (& bar -> mutex); 11: return; 12:] 13: while (bar -> count < bar ->n) { 14: cond wait (& bar ->cv, &bar -> mutex); 15: } Identify all bugs, if any exist. A. Lines 5, 10, and 16 B. Line 9 C. Lines 9 and 13 D. Line 13 E. No bugs
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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Can you help me with question 2
![Consider the following multi-threaded C code.
1: /* Waits until bar ->n threads have called barrier
2: *before allowing any thread to continue
3: */
4: void barrier (barrier_t * bar ) {
5: lock (& bar -> mutex);
6: bar -> count ++;
7: if (bar> count == bar ->n) {
8: bar -> count = 0; // reset barrier
9: cond_signal (& bar ->cv);
10: unlock (& bar -> mutex);
11: return;
12:]
13: while (bar -> count < bar ->n) {
14: cond wait (& bar ->cv, &bar -> mutex);
15: }](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7c7a9c2d-7e21-4f8b-b1a6-1c46011f548b%2F9e92477c-5549-4d62-b40e-16ee28c1ef65%2Fhnc2vyr_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Consider the following multi-threaded C code.
1: /* Waits until bar ->n threads have called barrier
2: *before allowing any thread to continue
3: */
4: void barrier (barrier_t * bar ) {
5: lock (& bar -> mutex);
6: bar -> count ++;
7: if (bar> count == bar ->n) {
8: bar -> count = 0; // reset barrier
9: cond_signal (& bar ->cv);
10: unlock (& bar -> mutex);
11: return;
12:]
13: while (bar -> count < bar ->n) {
14: cond wait (& bar ->cv, &bar -> mutex);
15: }
Transcribed Image Text:Identify all bugs, if any exist.
A. Lines 5, 10, and 16
B. Line 9
C. Lines 9 and 13
D. Line 13
E. No bugs
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