commit | ae5c7460d4fc179ad0e2cac9b454be120634daa5 | [log] [tgz] |
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author | Daniel Rodríguez Troitiño <danielrodriguez@fb.com> | Wed Nov 07 12:04:29 2018 -0800 |
committer | Daniel Rodríguez Troitiño <danielrodriguez@fb.com> | Wed Nov 07 12:04:29 2018 -0800 |
tree | 0e491ece564d0e54de239d74b94fd17513bd05bd | |
parent | 64a12c6bb1a4a8ce0a4c63bbba80b3c7c1427b6a [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.
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