swiftlang/swift-corelibs-libdispatch

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The libdispatch Project, (a.k.a. Grand Central Dispatch), for concurrency on multicore hardware

Stars: 2.6k
Forks: 496
Open beginner issues: 0
Indexed issues: 72
Avg merge: 2d 6h
Merged PRs (30d): 3

Dominant language: C
License: Apache-2.0
Last GitHub push: Sep 2, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

Open All

72 open issues indexed

Version windows builds Open

Windows

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#950 · Opened Jul 21, 2026
Use-after-free in epoll muxnote bookkeeping under concurrent `FileHandle.readabilityHandler` teardown (Linux) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#949 · Opened Jul 10, 2026
DispatchData.init(bytesNoCopy:deallocator:) with anything other than Deallocator.custom crashes with SEGV_ACCERR Open

Difficulty 4/5 3-5 days Newbie friendliness 50/100

swiftlang/swift-corelibs-libdispatch#947 · 3 comments · Opened Jul 1, 2026
C++23 `<stdatomic.h>` is incompatible with libdispatch's `_Atomic` shim Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

swiftlang/swift-corelibs-libdispatch#940 · Opened Apr 27, 2026
MSVC ARM64 miscompile in libdispatch needs to be reverted with a fix Open

Windows

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#929 · Opened Feb 9, 2026
Is the content of the INSTALL.md file outdated? Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

swiftlang/swift-corelibs-libdispatch#928 · 1 comment · Opened Feb 5, 2026
Add a CODEOWNERS file to this repo Open

Difficulty 1/5 Under an hour Newbie friendliness 55/100

swiftlang/swift-corelibs-libdispatch#919 · Opened Jan 6, 2026
Add `Sendable` conformance to `DispatchWorkItemsFlags` and `DispatchQueue` Open

Difficulty 3/5 1-2 days Newbie friendliness 50/100

swiftlang/swift-corelibs-libdispatch#910 · 2 reactions · Opened Sep 17, 2025
libdispatch compiled without frame pointers in at least in Swift 6.2, 6.1 and 6.0 on x86_64 Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

swiftlang/swift-corelibs-libdispatch#909 · 2 comments · Opened Sep 17, 2025
class DispatchSerialQueue not available under Linux Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#848 · 1 comment · Opened Oct 9, 2024
`DispatchQoS` and `DispatchSpecificKey` should have consistent `Sendable` conformances between macOS and linux Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

swiftlang/swift-corelibs-libdispatch#847 · 1 comment · Opened Oct 1, 2024
`DispatchQueue.main` is not bound to main thread on Windows Open

Linux Windows

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#846 · 1 comment · 4 reactions · Opened Sep 20, 2024
bug: `DispatchSpecificKey` missing conditional `Sendable` annotation Open

Difficulty 2/5 1-3 hours Newbie friendliness 52/100

swiftlang/swift-corelibs-libdispatch#845 · Opened Sep 17, 2024
Occasional `swiftc` crash on Windows, "disposed a muxnote with an active thread" Open

Windows

Difficulty 4/5 3-5 days Newbie friendliness 32/100

swiftlang/swift-corelibs-libdispatch#844 · 1 comment · Opened Sep 16, 2024
Re-adding dispatch source for socket file descriptors results in reuse and incorrect update of dispatch_muxnote_t on Ubuntu, Android, and Windows Open

Android Linux Windows

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#833 · 5 comments · 1 reaction · Opened Jul 2, 2024
DispatchIO.read spinning while pipe is open on Windows Open

Windows

Difficulty 4/5 3-5 days Newbie friendliness 48/100

swiftlang/swift-corelibs-libdispatch#820 · 45 comments · 1 reaction · Opened Mar 6, 2024
Test dispatch_after flakiness Open

Windows

Difficulty 3/5 1-2 days Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#818 · Opened Feb 28, 2024
bug: There is no way to get current queue / current queue label under Linux Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

swiftlang/swift-corelibs-libdispatch#813 · 2 comments · Opened Feb 14, 2024
GitHub Releases Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-corelibs-libdispatch#800 · 12 comments · 1 reaction · Opened Nov 19, 2023
Implementing an alternative to Block_copy Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

swiftlang/swift-corelibs-libdispatch#795 · 1 reaction · Opened Jun 6, 2023
DispatchTime.distance(to:) is not implemented Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

swiftlang/swift-corelibs-libdispatch#786 · 1 reaction · Opened Apr 8, 2023
Linux: DispatchTimeInterval not Equatable Open

Linux

Difficulty 3/5 1-2 days Newbie friendliness 45/100

swiftlang/swift-corelibs-libdispatch#834 · 1 reaction · Opened Mar 23, 2023
Add `Sendable` conformances to thread-safe types Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#779 · 1 comment · 3 reactions · Opened Feb 9, 2023
[SR-15545] Linux: DispatchTime's advanced() is not implemented Open

bug Foundation libdispatch Linux

Difficulty 3/5 1-2 days Newbie friendliness 38/100

swiftlang/swift-corelibs-libdispatch#601 · 1 comment · 2 reactions · Opened Dec 1, 2021
[SR-15528] Can't convert DispatchQueue to dispatch_queue_t on Linux Open

bug libdispatch Linux Standard Library

Difficulty 3/5 1-2 days Newbie friendliness 52/100

swiftlang/swift-corelibs-libdispatch#602 · 1 comment · Opened Nov 28, 2021
[SR-13841] Perf Incorrectly Assigns Dispatch Calls Open

bug libdispatch

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-corelibs-libdispatch#608 · 1 comment · Opened Nov 10, 2020
[SR-13383] Windows, Dispatch crashes after network request timeout Open

bug Dispatch Foundation libdispatch Windows

Difficulty 4/5 3-5 days Newbie friendliness 45/100

swiftlang/swift-corelibs-libdispatch#609 · 5 comments · Opened Aug 12, 2020
[SR-13154] DispatchWorkItemFlags.barrier behavior on global queues documentation Open

libdispatch Task

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#610 · Opened Jul 6, 2020
[SR-11813] DispatchGroup not Equatable on Linux Open

bug libdispatch Linux

Difficulty 3/5 1-2 days Newbie friendliness 45/100

swiftlang/swift-corelibs-libdispatch#613 · 2 comments · Opened Nov 19, 2019
[SR-11647] Swift 5.1 on Linux: Regression in OperationQueue concurrency Open

5.1Regression bug Foundation libdispatch

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#614 · 2 comments · Opened Oct 21, 2019
[SR-10813] DispatchWorkItem leak on armv7 Open

bug Leak libdispatch

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#616 · 1 comment · Opened May 31, 2019
[SR-10559] libdispatch fails to build with _FORTIFY_SOURCE=2 Open

bug libdispatch

Difficulty 2/5 1-3 hours Newbie friendliness 38/100

swiftlang/swift-corelibs-libdispatch#617 · 3 comments · Opened Apr 26, 2019
[SR-10319] sourcekit-lsp crashing when opening a swift package with VSC Open

bug libdispatch SourceKit-LSP

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-corelibs-libdispatch#618 · 5 comments · Opened Apr 5, 2019
[SR-10284] Missing submodule 'Dispatch' while building Apple Swift 5 master on PowerPC64LE Open

bug libdispatch

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-corelibs-libdispatch#619 · 1 comment · Opened Apr 3, 2019
[SR-9863] Libdispatch's semaphores mishandle exits due to signals Open

bug libdispatch

Difficulty 4/5 3-5 days Newbie friendliness 45/100

swiftlang/swift-corelibs-libdispatch#623 · 2 comments · Opened Feb 4, 2019
[SR-9631] Extend `dispatchPrecondition` with context parameters. Open

Improvement libdispatch

Difficulty 5/5 Over a week Newbie friendliness 32/100

swiftlang/swift-corelibs-libdispatch#626 · Opened Jan 10, 2019
[SR-9597] DispatchData.copyBytes allocates Open

bug libdispatch

Difficulty 5/5 Over a week Newbie friendliness 25/100

swiftlang/swift-corelibs-libdispatch#627 · 5 comments · Opened Jan 3, 2019
[SR-9384] Figure out why Foundation integration test for compiling on Linux with -static-stdlib fails Open

Foundation libdispatch Task

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-corelibs-libdispatch#628 · 13 comments · Opened Nov 30, 2018
[SR-9368] libdispatch_static unit tests are disabled Open

bug libdispatch

Difficulty 3/5 1-2 days Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#629 · 1 comment · Opened Nov 28, 2018
[SR-9347] XCTest and dispatch compiled with wrong linker settings [was: SwiftPM libBlocksRuntime.so.0 missing dependency] Open

bug libdispatch

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-corelibs-libdispatch#630 · 17 comments · Opened Nov 26, 2018
[SR-9330] DispatchSourceTimer schedule methods should document the default values Open

bug libdispatch

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

swiftlang/swift-corelibs-libdispatch#631 · 2 comments · Opened Nov 23, 2018
[SR-9329] Dispatch overlay desperately needs documentation Open

bug libdispatch

Difficulty 5/5 Over a week Newbie friendliness 25/100

swiftlang/swift-corelibs-libdispatch#632 · 2 comments · Opened Nov 23, 2018
[SR-9080] <unknown>:0: error: cannot load underlying module for 'Dispatch' Open

bug libdispatch

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-corelibs-libdispatch#642 · 10 comments · Opened Oct 25, 2018
[SR-9050] error: cannot load underlying module for 'Dispatch' Open

bug libdispatch

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-corelibs-libdispatch#643 · 4 comments · Opened Oct 20, 2018
[SR-8925] error when building libdispatch: unsupported compiler Open

bug CMake libdispatch Linux

Difficulty 4/5 3-5 days Newbie friendliness 30/100

swiftlang/swift-corelibs-libdispatch#646 · 4 comments · Opened Oct 5, 2018
[SR-7868] Data and DispatchData have subtly different signatures for enumerateBytes Open

bug Foundation libdispatch

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-corelibs-libdispatch#652 · 2 comments · Opened Jun 4, 2018
[SR-7724] libdispatch gets built twice on Linux when sourcekit is enabled Open

bug libdispatch

swiftlang/swift-corelibs-libdispatch#654 · 5 comments · 1 assignee · Opened May 18, 2018
[SR-7544] DispatchData.makeIterator allocates Open

bug libdispatch

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-corelibs-libdispatch#656 · 2 comments · Opened Apr 26, 2018
[SR-7316] libdispatch: DISPATCH_SOURCE_TYPE_DATA_* does not work with the epoll backend (linux) Open

bug libdispatch

Difficulty 4/5 3-5 days Newbie friendliness 38/100

swiftlang/swift-corelibs-libdispatch#658 · Opened Mar 31, 2018
[SR-7269] Explicitly declaring `import CDispatch` is required to use `NSEC_PER_SEC` on Linux. Open

bug libdispatch

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-corelibs-libdispatch#659 · 4 comments · 2 reactions · Opened Mar 24, 2018

swiftlang/swift-corelibs-libdispatch

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