More Concurrency Exercises and OpenMP Shuaiwen Concurrency and Synchronization Exercise 2 How many lines of output will it produce? Answer: 7 Q1(fork) 3 Q2 (sempahores) Consider the following program using semaphores . Which of the following execution order of sem_wait and sem_post are possible (W represent sem_wait, P represent sem_post)? (A) WPWWWP (B) WWPPWW (C) […]
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proc1( ) { pthread_mutex_lock(&m1); /* use object 1 */ pthread_mutex_lock(&m2); /* use objects 1 and 2 */ pthread_mutex_unlock(&m2); pthread_mutex_unlock(&m1); proc2( ) { pthread_mutex_lock(&m2); /* use object 2 */ pthread_mutex_lock(&m1); /* use objects 1 and 2 */ pthread_mutex_unlock(&m1); pthread_mutex_unlock(&m2); }} Graph representation (“wait-for” graph) for the entire process draw an arrow from a mutex you are
SOFT3410 Tutorial 2 Standard Library, Files and Function Pointers Question 1: Files We are able to access files on your system using the file api functions and types. The FILE type is a portable abstraction for interacting with files and streams on your system. Once opened, you can use functionslikefwrite, fgets, fread, fputs, …toreadorwrite. int
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7/13/21 COMP712 Programming Languages Lecture 1: Introduction Albert Yeap WT410 AUT University 2021 What is this course about? 1 COMP712: Programming Languages Your paper descriptor shows: • Foundations of programming languages • Principles of compilers and interpreters • Runtimes and virtual machines • Programming paradigms What make languages tick! 2 12 A programming language is
Operating Systems – CSCI 402 5.2 Interrupts 32 321 0 Copyright ý . Systems – CSCI 402 Interrupt Handling – Overview Interrupt Handling Deferred Work Directed Processing APCs Signals Interrupts Threads Thread preemption 33 321 0 Copyright ý . Cheng 3) an interrupt handler running on the same processor that accesses the same data structure
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SOFT3410 Tutorial 4 Measuring, Graphing and Techniques We will be looking into performance analysis of applications. We are mostly concerned with the cpu usage but we will check out memory usage. Question 1: Time Command To get a rough idea of the real time implications of our application, we can utilise a unix command to
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SOFT3410 Tutorial 7 Atomics You have a quiz today and we will look into atomics Question 1: Atomic Operations, Counting and Stacks As we have noted prior, race conditions occur when we have more than one thread mutating shared memory. Atomics actually allow us to deal with this situation by making the write visible to
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SOFT3410 Tutorial 3 Dynamic Memory and Data Structures Today’s lab will involve constructing a few common data structures and getting familiar with dynamic memory Question 1: Malloc and Free Unlike Java, C’s heap allocation is explicit and depends on standard library functions. The functions we will be using for heap allocation are malloc and free.
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Concurrency with Threads and Synchronization Shuaiwen Song Objectives • To learn what a thread is • Tounderstandthedifferencebetween processesand threads • To learn about programming with threads using the pthread library • Data Race and Race condition • Protecting shared resource: Synchronization, Atomic Operations, Immutable Data • Synchronization: Semaphores, Mutex, Conditional Variables, read-write locks, spin locks,
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SOFT3410 Tutorial 6 Synchronisation 1 Question 1: Shared Memory and Locking Below is an example of two threads accessing shared data. Compile this program and observe the final value. struct thread_data { int value; }; void* work1(void* arg) { struct thread_data* data = (struct thread_data*) arg; for(int i = 0; i < 10000; i++) {
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