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Ownership Types for Safe Programming Chandrasekhar Boyapati Laboratory for Computer Science Massachusetts Institute of Technology

Title: Preventing Encapsulation errors Subject: POPL 2003 Author: Chandra Boyapati Last modified by: Chandrasekhar Boyapati Created Date: 7/17/2002 10:50:18 PM

A Type System for Preventing Data Races and Deadlocks in the Java Virtual Machine Language Pratibha Permandla Michael Roberson Chandrasekhar Boyapati

Title: Preventing Upgrade Errors Subject: OOPLA 2003 Author: Barbara Liskov Last modified by: Chandrasekhar Boyapati Created Date: 10/24/2003 4:47:20 PM

A Parameterized Type System for Race-Free Java Programs Chandrasekhar Boyapati Martin Rinard Laboratory for Computer Science Massachusetts Institute of Technology

A Parameterized Type System for Race-Free Java Programs. Chandrasekhar Boyapati Martin Rinard ... Statically verifiable race-free program. a1 is locked before ...

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Ownership Types for Object Encapsulation. Authors: Chandrasekhar ... A brief digression: const. Consider the following C code: Produces following errors: ...

... least one access is a write No synchronization to separate accesses Avoiding Data Races Avoiding Data Races Associate locks with shared mutable data Acquire ...

Thread n holds Lock n, waits for Lock 1. Deadlocks in ... Threads must acquire locks in descending order of lock levels. Lock Level Based Partial Orders ...

Detecting Potential Deadlocks with Static Analysis and Run-Time Monitoring Rahul Agarwal, Liqiang Wang, Scott D. Stoller

Must update component C as well! Might not be obvious without sharing specification ... No aliases in heap data structures. Still must track lent aliases on the stack ...

EFFICIENT EXPLICIT-STATE MODEL CHECKING FOR PROGRAMS WITH DYNAMICALLY ALLOCATED DATA Marcelo d Amorim Ph.D. thesis committee: Gul Agha

Method Overriding Downcast. Experimental Results. No ... Supports OO features : class subtyping, method overriding, and downcast safety. Implementation ...

Type-Safe Multithreading in Cyclone Dan Grossman Cornell University TLDI 2003 18 Jan 2003 Cyclone + threads = ? Cyclone is a safe language at the C level Target ...

S, s - the program statement S is executed on input state s ... This led to 'spaghetti' code that was difficult to unravel, understand and maintain ...

Modular Unsoundness. Pointer-arithmetic corner cases. Accesses in assembly code. Function pointers ... Modular unsoundness. finds 53 races (or 25 after all filters) ...

Specification-Based Error Localization Brian Demsky Martin Rinard Laboratory for Computer Science Massachusetts Institute of Technology

A race condition occurs if two threads access a shared variable at the same time, ... 'String buffers are safe for use by multiple threads. ...

A Parameterized Type System for Race-Free Java ... require almost no programming overhead Outline Motivation ... game server stock quote server ...

does program behaves correctly for all inputs and all interleavings? very hard to ensure with testing. Bugs due to concurrency are insidious ...

Efficient Software Model Checking of Data Structure Properties. Paul T. Darga ... Many software model checkers. Verisoft, JPF, CMC, SLAM, Blast, Magic, ...

does program behaves correctly for ... GE Energy's Mike Unum. Race conditions ... Savage et al. 97 (Eraser tool) Cheng et al. 98. Choi et al. 02. int balance; ...

Component architecture for large-scale server-side computing ... CB5 Fields, methods, and statics of non-confined classes having confined type ...

... Model Checking of Soundness of Type Systems ... Proving type soundness is important. Becoming its own research area ... to a Soundness Proof: Progress ...

reverse. put. add. lookup. BinaryTree. HeapArray. LinkedList. TreeMap. HashSet. AVTree. methods checked for all inputs up to given size ...

Cyclone is a programming language and compiler. aimed at safe systems programming ... Designed and implemented Cyclone, a safe C-level. language ...

Memory Models: A Case for Rethinking Parallel Languages and Hardware Sarita Adve University of Illinois sadve@illinois.edu Acks: Mark Hill, Kourosh Gharachorloo ...

Monitoring the dynamic Web to respond to Continuous Queries. Sandeep ... Users register long ... NIAGARA (DeWitt and Naughton) Query evaluation and ...

Remaining parameters (if any) specify owners of fields, method parameters, return values, etc. ... requires clause for each method ...

Exponentially many behaviors: hard to detect, reproduce errors ... One of the accesses is a write. Unpredictable, undesirable program ...

Data race: one thread mutating some memory while another thread ... Guava (race-free Java, rigid local/shared distinction) Bug-finding tools (ESC/Java, Warlock, ...

Two threads concurrently access same data. At least one access is a write ... Problem: Locking is not enforced! Inadvertent programming errors... Our solution ...

Basic type system: Locks, thread-local objects. Object ownership. Type system. Type inference ... Necessary and sufficient to lock its root owner ...

Automated Testing Based on Java Predicates. Sarfraz Khurshid, MIT ... test input generation ... Korat automates specification-based testing ...

Verification of Programs with Inspector Methods. Bart Jacobs and Frank Piessens ... if o.inv is true, then 'o is valid'; otherwise 'o is mutable' ...

Title: PowerPoint Presentation Author: Scott Stoller Last modified by: stoller Created Date: 8/10/2004 6:42:28 PM Document presentation format: On-screen Show

Changing the algorithms and data structures in nodes making up a CFS system ... void insert (Sortable x) void insert (Sortable x, int x) Upgrade Requirements ...

Adam Pacholski. Top overall score. Jonathan Brown - 4 - 483 Exam 2 Other Awards ... T. Mowry, S. Goldstein. Penn St. M. Irwin, M. Kandemir. UCSD. B. Calder, ...

Static Deadlock Detection for Java Libraries Amy Williams, William Thies, and Michael D. Ernst Massachusetts Institute of Technology Deadlock Each deadlocked thread ...

He was noticed to be pale in color with multiple bruises on his legs. ... treatment with chemotherapy, brachytherapy, external radiation, and surgical excision. ...

mk-fun2 (var (succ (succ zero))) There is no name for 2! 27 ... var has type Name = expr. encoded as. 35. Consistency by Translation ...

Many websites allow users to receive email alerts or updated news on particular events ... CNN webpage shot on Apr 16. 6. Goal of this Paper ...

r e is equivalent to e r for all events e of other threads ... If two threads do not run concurrently, operations in one cannot race with ...

Goal: find client calls that deadlock library or verify that none exist ... PropertyChangeEvent event = new PropertyChangeEvent(source, 'beanContext' ...

bboards tech news business-page front-page. PL is uniquely ... Fancy types mean weird error messages and/or buggy compiler. Good news: 3 new research projects ...

... Jim (AT&T), Greg Morrisett, Michael Hicks, James Cheney, Yanling Wang (Cornell) ... Lack of memory safety means code cannot enforce modularity/abstractions: ...

... Semantics (Felleisen-style) Executable Logical ... Executable Felleisen-style Semantics ... ML-style syntax, but first-order except for some builtin functions ...

System.out.println(sum.re ',' sum.im); new. Polynomial evaluation. ISMM 2004 ... System.out.println(sum.re ',' sum.im); Adding create and remove statements ...

Method addListenerMethod = (Method) listeners.get(property); Execution trace information: ... closure = (Closure) methods.get(name); Execution trace information: ...

An unintended condition in a shared-memory, multi-threaded program in which: ... Models only thread fork construct. Other conditions model other constructs. t1. l1. l2 ...