|author||Saleem Abdulrasool <email@example.com>||Wed Feb 21 15:36:08 2018 -0800|
|committer||Saleem Abdulrasool <firstname.lastname@example.org>||Wed Feb 21 15:37:41 2018 -0800|
dispatch: adjust for LLP64 environments LLP64 environments use a 32-bit long value. This would result in truncation as the `long` is used to transfer a pointer value here. Adjust the types accordingly. Since the width on LP64 environments is equivalent in this change, this should only impact LLP64 environments and be ABI stable otherwise.
Grand Central Dispatch (GCD or libdispatch) provides comprehensive support for concurrent code execution on multicore hardware.
libdispatch is currently available on all Darwin platforms. This project aims to make a modern version of libdispatch 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.
libdispatch 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 libdispatch to Linux has been completed. On Linux, since Swift 3, swift-corelibs-libdispatch 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 libdispatch, see INSTALL.md
For detailed instructions on testing libdispatch, see TESTING.md