X10 (programming language)

X10

Paradigm	Object-oriented
Designed by	Kemal Ebcioğlu, Vijay Saraswat, and Vivek Sarkar
Developer	IBM
First appeared	2004
Stable release	2.5.4 / December 21, 2015 (2015-12-21)
Typing discipline	Static, strong, safe, constrained
OS	IBM AIX, Linux, Mac OS X, Windows
License	Eclipse Public License 1.0
Filename extensions	.x10
Website	x10-lang.org
Influenced by
C++, Java

X10 is a programming language being developed by IBM at the Thomas J. Watson Research Center as part of the Productive, Easy-to-use, Reliable Computing System (PERCS) project funded by DARPA's High Productivity Computing Systems (HPCS) program. Its primary authors are Kemal Ebcioğlu, Vijay Saraswat, and Vivek Sarkar.

X10 is designed specifically for parallel computing using the partitioned global address space (PGAS) model. A computation is divided among a set of places, each of which holds some data and hosts one or more activities that operate on those data. It has a constrained type system for object-oriented programming, a form of dependent types. Other features include user-defined primitive struct types; globally distributed arrays, and structured and unstructured parallelism.

X10 uses the concept of parent and child relationships for activities to prevent the lock stalemate that can occur when two or more processes wait for each other to finish before they can complete. An activity may spawn one or more child activities, which may themselves have children. Children cannot wait for a parent to finish, but a parent can wait for a child using the finish command.

See also

• Chapel
• Coarray Fortran
• Concurrency
• Fortress
• Non-blocking algorithm
• Parallel programming model
• Unified Parallel C

External links

• Overview of PGAS languages
• Vivek Sarkar's X10 slides
• GPLed X10 prototype