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fuchsia / third_party / swift-corelibs-libdispatch / ae5c7460d4fc179ad0e2cac9b454be120634daa5
commitae5c7460d4fc179ad0e2cac9b454be120634daa5[log] [tgz]
authorDaniel Rodríguez Troitiño <danielrodriguez@fb.com>Wed Nov 07 12:04:29 2018 -0800
committerDaniel Rodríguez Troitiño <danielrodriguez@fb.com>Wed Nov 07 12:04:29 2018 -0800
tree0e491ece564d0e54de239d74b94fd17513bd05bd
parent64a12c6bb1a4a8ce0a4c63bbba80b3c7c1427b6a [diff]
Add string.h for memcpy in Data.swift.

In Data.swift the C function memcpy is used as part of _copyBytesHelper.
The function is defined in string.h, but that header is not referenced
directly by any of the headers in dispatch/ or by DispatchOverlayShims.h
in the compiler, which are the only two headers imported by the swift
file.

For some reason, this is working on Darwin and Ubuntu, probably because
some included header includes string.h or defines memcpy, avoiding the
problem. For those platforms that this already works, adding an extra
include should not affect them.
1 file changed
tree: 0e491ece564d0e54de239d74b94fd17513bd05bd
  1. cmake/
  2. dispatch/
  3. libdispatch.xcodeproj/
  4. man/
  5. os/
  6. private/
  7. resolver/
  8. src/
  9. tests/
  10. tools/
  11. xcodeconfig/
  12. xcodescripts/
  13. .gitignore
  14. .gitmodules
  15. .mailmap
  16. CMakeLists.txt
  17. CONTRIBUTING.md
  18. INSTALL.md
  19. LICENSE
  20. PATCHES
  21. README.md
  22. TESTING.md
README.md

Grand Central Dispatch

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.

Project Status

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:

  1. Develop a test suite for the Swift APIs of libdispatch.
  2. Enhance libdispatch as needed to support Swift language evolution and the needs of the other Core Libraries projects.

Build and Install

For detailed instructions on building and installing libdispatch, see INSTALL.md

Testing

For detailed instructions on testing libdispatch, see TESTING.md