Problem 3. (Note: If any part of your answer comes from an AI system, you must cite the system you use and tell what the prompt was.) POSIX threads provides another useful synchro- nization mechanism, called a condition variable. Condition variables provide a solution for the same race condition we saw with processes sending signals to each other in the "ping-pong" example shown in lecture Wednesday 8 November. (See the code for that example, particularly the use of sigprocmask() and sigsuspend() in the await_event () function. The basic problem is how to keep notification that a condition has become true from arriving between the time a thread checks the condition (and finds it false) and the time it suspends execution. a. Read the man page for pthread_cond_wait (), focusing on the "DESCRIPTION" section. (Ignore timed waits and everything about "robust" mutexes.) What are the arguments to this function? b. What is the important precondition for pthread_cond_wait()? In other words, what must be true when a thread calls this function, or else undefined behavior results? c. Read the man page for pthread_cond_broadcast() (and pthread_cond_signal()). Does a thread need to hold a mutex lock when it calls signal or broadcast on the condition variable?
Problem 3. (Note: If any part of your answer comes from an AI system, you must cite the system you use and tell what the prompt was.) POSIX threads provides another useful synchro- nization mechanism, called a condition variable. Condition variables provide a solution for the same race condition we saw with processes sending signals to each other in the "ping-pong" example shown in lecture Wednesday 8 November. (See the code for that example, particularly the use of sigprocmask() and sigsuspend() in the await_event () function. The basic problem is how to keep notification that a condition has become true from arriving between the time a thread checks the condition (and finds it false) and the time it suspends execution. a. Read the man page for pthread_cond_wait (), focusing on the "DESCRIPTION" section. (Ignore timed waits and everything about "robust" mutexes.) What are the arguments to this function? b. What is the important precondition for pthread_cond_wait()? In other words, what must be true when a thread calls this function, or else undefined behavior results? c. Read the man page for pthread_cond_broadcast() (and pthread_cond_signal()). Does a thread need to hold a mutex lock when it calls signal or broadcast on the condition variable?
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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