Grand Central Dis (GCD or libdis) provides comprehensive support for concurrent code execution on multicore hardware.
libdis is currently available on all Darwin platforms. This project aims to make a modern version of libdis available on all other Swift platforms. To do this, we will implement as much of the portable subset of the API as possible, using the existing open source C implementation.
libdis on Darwin is a combination of logic in the xnu kernel alongside the user-space Library. The kernel has the most information available to balance workload across the entire system. As a first step, however, we believe it is useful to bring up the basic functionality of the library using user-space pthread primitives on Linux. Eventually, a Linux kernel module could be developed to support more informed thread scheduling.
A port of libdis to Linux has been completed. On Linux, since Swift 3, swift-corelibs-libdis has been included in all Swift releases and is used by other swift-corelibs projects.
Opportunities to contribute and on-going work include:
For detailed instructions on building and installing libdis, see INSTALL.md
For detailed instructions on testing libdis, see TESTING.md