PPT-1 Practical Lock/Unlock Pairing

for Concurrent Programs Hyoun Kyu Cho 1 Yin Wang 2 Hongwei Liao 1 Terence Kelly 2 St é phane Lafortune 1 Scott Mahlke 1 1 University of Michigan 2 HewlettPackard Labs. for Deterministic, Stable, and Reliable Threads. Heming Cui. , . Jiri. . Simsa. , Yi-Hong Lin, . Hao. Li, Ben Blum, . Xinan. . Xu. , . Junfeng. Yang, Garth Gibson, Randal Bryant. 1. Columbia University. Enter. one Contract Number that you Administer and . select. an Action.. Or, . choose. one or many contract numbers.. Lock Contract Number(s). Unlock Contract Number(s). The . Actions. you can select are:. CV. Last lecture. Controlling interrupts. Test . and set (atomic exchange). Compare and swap. Load linked . and . store conditional. Fetch and add . and . ticket locks. typedef. . struct. __. lock_t. David Ferry, Chris Gill. CSE 522S - Advanced Operating Systems. Washington University in St. Louis. St. Louis, MO 63143. 1. Linux is a Preemptive Kernel. The Linux kernel executes concurrently with itself:. David Ferry, Chris Gill. CSE 522S - Advanced Operating Systems. Washington University in St. Louis. St. Louis, MO 63143. 1. Linux is a Preemptive Kernel. The Linux kernel executes concurrently with itself:. Dept. of Computer Science. 15-415 - Database Applications. Concurrency Control, II. (R&G . ch. . 17). Faloutsos. SCS 15-415. 2. Review. DBMSs support . ACID Transaction semantics. .. Concurrency control and Crash Recovery are key components. David Ferry, Chris Gill. CSE . 422S . - . Operating Systems Organization. Washington University in St. Louis. St. Louis, MO 63143. 1. Linux is a Preemptive Kernel. In Linux, many activities may execute concurrently across. Concurrency. Threads. Locks. Condition Variables. Fixing atomicity violations and order violations. Semaphore. Semaphores . keep extra state, so users sometimes don’t. .. Unlike . CV, signal was not lost . 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 Automated Atomicity-Violation Fixing Guoliang Jin ,  Linhai  Song, Wei Zhang, Shan Lu, and Ben Liblit University of Wisconsin–Madison AFix 1 Multicore era is coming already here Programmers struggle class Lock {. Lock() {}. int locked = 0;. . ThreadQueue. q;. };. void Lock::lock() {. . intrDisable. ();. if (!locked) {. locked = 1;. } else {. . q.add. (. currentThread. Prof. . Moonzoo. Kim. CS KAIST. CS492B Analysis of Concurrent . Programs. 1. Bug Detection Techniques for Concurrent Programs. 1,000,000 LOC <. 100~1,000 LOC. Precision. rstest. . ConTest. . MetaL.