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RA. An Introduction to . std. ::atomic<T. >. and . the . C++. 11 Memory . M. odel. The ABC’s of Atomics. C++11 atomic operations library. Header . <atomic>. Atomic types. std. ::. atomic. <. P&H Chapter 2.11. Han Wang. CS 3410, Spring 2012. Computer Science. Cornell University. Shared Memory Multiprocessors. Shared Memory Multiprocessor (SMP). Typical (today): 2 – 4 . processor dies. David . Monismith. c. s550. Operating Systems. Bounded-Buffer or Producer-Consumer Problem. Involves two or more processes. In its simplest form we have:. 1 producer that creates data items and puts them in a buffer (a shared memory location). Ken . Birman. 1. Synchronization paradigms. We’ve looked at critical sections. Really, a form of locking. When one thread will access shared data, first it gets a kind of lock. This prevents other threads from accessing that data until the first one has finished. cs550. Operating Systems. David . Monismith. Deadlock. Four requirements for deadlock . Hold and wait - process holds resource while waiting for more resources . Mutual Exclusion - resource can't be shared. 2.15.1 . 10/18/13 . BASIC 09-0. 1. -ROSSD-SL. BASIC UNIT 9. RELEASE & REASSIGN RESOURCES. DRAFT ROSS Version . 2.15.1 . 10/18/13 . BASIC 09-0. 2. -ROSSD-SL. UNIT 9 OBJECTIVES. Hakim Weatherspoon. CS 3410, Spring 2012. Computer Science. Cornell University. P&H Chapter 2.11. Administrivia. Pizza . party: PA3 Games Night. Friday, April 27. th. , 5:00-7:00pm. Location: Upson . Deadlocks – Problems and Solutions. CS. . 111. Operating . Systems . Peter Reiher. . Outline. The deadlock problem. Approaches to handling the problem. Handling general synchronization bugs. Simplifying synchronization. Overview. Concurrent programming and race conditions. Mutual exclusion. Implementing mutual exclusion. Deadlocks, starvation, . livelock. 2. Concurrent Programming. Programming with two or more threads that cooperate to perform a common task. Hakim Weatherspoon. CS 3410, Spring 2012. Computer Science. Cornell University. P&H Chapter 2.11. Goals for Today. Synchronization. Threads and processes. Critical sections, race conditions, and . Lecture 10 Locks Scheduling Control: Mutex /Lock Basic pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; pthread_mutex_lock (&lock); x = x + 1; // or whatever your critical section is Lecture 10 Locks Scheduling Control: Mutex /Lock Basic pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; pthread_mutex_lock (&lock); x = x + 1; // or whatever your critical section is Lecture 13 Concurrency Bugs CV rules of thumb: Keep state in addition to CV’s Always do wait/signal with lock held Whenever you acquire a lock, recheck state Implementing Join with CV void thread_exit CS 3410, Spring 2011. Computer Science. Cornell University. P&H Chapter 2.11. Announcements. PA4 due . next. , Friday, May 13. th. Work in . pairs. Will not be able to use slip . days. Need . to schedule time for presentation May 16, 17, or .