From 716dd31f7cf52d9772fd4ed687f9cdc921443a35 Mon Sep 17 00:00:00 2001 From: Luke Shumaker Date: Thu, 26 Jan 2023 12:23:15 -0700 Subject: Set up as a separate repo --- .golangci.yml | 56 ---- COPYING.apache-2.0.txt | 202 ------------ COPYING.gpl-2.0.txt | 339 --------------------- COPYING.gpl-3.0.txt | 674 ----------------------------------------- COPYING.txt | 38 --- LICENSE.gpl-2.0.txt | 339 +++++++++++++++++++++ LICENSE.txt | 16 + Makefile | 16 +- go.mod | 3 + lib/containers/syncmap.go | 53 ---- lib/containers/syncpool.go | 33 -- lib/containers/syncvalue.go | 67 ---- map.go | 53 ++++ pool.go | 33 ++ tools/.gitignore | 1 + tools/src/golangci-lint/go.mod | 2 +- value.go | 67 ++++ 17 files changed, 517 insertions(+), 1475 deletions(-) delete mode 100644 COPYING.apache-2.0.txt delete mode 100644 COPYING.gpl-2.0.txt delete mode 100644 COPYING.gpl-3.0.txt delete mode 100644 COPYING.txt create mode 100644 LICENSE.gpl-2.0.txt create mode 100644 LICENSE.txt create mode 100644 go.mod delete mode 100644 lib/containers/syncmap.go delete mode 100644 lib/containers/syncpool.go delete mode 100644 lib/containers/syncvalue.go create mode 100644 map.go create mode 100644 pool.go create mode 100644 tools/.gitignore create mode 100644 value.go diff --git a/.golangci.yml b/.golangci.yml index 355664f..d201869 100644 --- a/.golangci.yml +++ b/.golangci.yml @@ -24,87 +24,31 @@ linters: - ireturn # golangci-lint doesn't claim it doesn't, but it doesn't # Style - - godot - - lll - nlreturn - nonamedreturns # I name returns for godoc purposes. - wsl - # Complexity; sometimes code is just complex. - - cyclop - - funlen - - gocognit - - gocyclo - - maintidx - - nestif - - # Miscellaneous - - goerr113 # forbids fmt.Errorf(%w), which is just silly - - godox # I'm OK checking in to-be-completed tasks - # These are disabled not because I think they're bad, but because # they currently don't pass, and I haven't really evaluated them yet. - - exhaustive - - exhaustruct - - gochecknoglobals - - gochecknoinits - revive - - testpackage - - thelper - - varnamelen - - wrapcheck linters-settings: - errcheck: - exclude-functions: - - "git.lukeshu.com/btrfs-progs-ng/lib/textui.Fprintf" gci: sections: - standard - default - - prefix(git.lukeshu.com/btrfs-progs-ng) - gocritic: - disabled-checks: - - appendAssign gofmt: simplify: true - gomnd: - ignored-numbers: - - '2' - ignored-functions: - - 'binutil.NeedNBytes' - - 'textui.Tunable' - gomoddirectives: - replace-allow-list: - - github.com/jacobsa/fuse gosec: excludes: - G104 # duplicates errcheck - - G304 # this program opens arbitrary files nolintlint: require-explanation: true require-specific: true - allow-no-explanation: - - dupword stylecheck: checks: - "all" - - "-ST1003" # CONST_VAL names for consistency with other btrfs code - "-ST1000" # TODO: get this to pass - - "-ST1020" # TODO: get this to pass - - "-ST1021" # TODO: get this to pass - tagliatelle: - case: - use-field-name: true - rules: - json: pascal issues: exclude-use-default: false - exclude-rules: - # Ignore false positives that don't actually have any words. - - linters: [dupword] - source: "^[^a-zA-Z]*$" - # https://github.com/dominikh/go-tools/issues/1347 - - linters: [stylecheck] - text: '^ST1016: methods on the same type should have the same receiver name \(seen 1x "(a|dst)", \d+x "[^"]+"\)$' max-issues-per-linter: 0 max-same-issues: 0 diff --git a/COPYING.apache-2.0.txt b/COPYING.apache-2.0.txt deleted file mode 100644 index d645695..0000000 --- a/COPYING.apache-2.0.txt +++ /dev/null @@ -1,202 +0,0 @@ - - Apache License - Version 2.0, January 2004 - http://www.apache.org/licenses/ - - TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION - - 1. 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Of course, the commands you use may -be called something other than `show w' and `show c'; they could even be -mouse-clicks or menu items--whatever suits your program. - -You should also get your employer (if you work as a programmer) or your -school, if any, to sign a "copyright disclaimer" for the program, if -necessary. Here is a sample; alter the names: - - Yoyodyne, Inc., hereby disclaims all copyright interest in the program - `Gnomovision' (which makes passes at compilers) written by James Hacker. - - , 1 April 1989 - Ty Coon, President of Vice - -This General Public License does not permit incorporating your program into -proprietary programs. If your program is a subroutine library, you may -consider it more useful to permit linking proprietary applications with the -library. 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If your program is a subroutine library, you -may consider it more useful to permit linking proprietary applications with -the library. If this is what you want to do, use the GNU Lesser General -Public License instead of this License. But first, please read -. diff --git a/COPYING.txt b/COPYING.txt deleted file mode 100644 index d8b9862..0000000 --- a/COPYING.txt +++ /dev/null @@ -1,38 +0,0 @@ -btrfs-progs-ng - Better btrfs userspace tools -Copyright (C) 2022 Luke Shumaker - -This program is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 3 of the License, or (at -your option) any later version. Individual source files may be -available (at your option) under an alternative license. - -Most of the source code is licensed under the terms of the GNU General -Public License as published by the Free Software Foundation; either -version 2 of the License, or (at your option) any later version. A -small minority of the source code is licensed under the terms of the -Apache License, version 2.0. Refer to the "SPDX-License-Identifier" -comment in each file to see which license it is made available under. - - > The terms of the GNU General Public License version 2 and terms of - > the Apache License version 2.0 are contradictory--they cannot both - > be fulfilled at the same time; but the terms of the GNU General - > Public License version 3 and the Apache License version 2.0 are not - > contradictory and can be fulfilled at the same time. Because of - > this one must take the "or (at your option) any later version" on - > the General Public License and treat the combined work as being - > under the GNU General Public License version 3 or later. This is - > why the opening paragraph identified the program as being available - > under this version. - -This program is distributed in the hope that it will be useful, but -WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -General Public License for more details. - -Along with this program, you should have received a copy of the GNU -General Public License (in the COPYING.gpl-2.0.txt and -COPYING.gpl-3.0.txt files) and the Apache License (in the -COPYING.apache-2.0.txt file). If not, see - and -. diff --git a/LICENSE.gpl-2.0.txt b/LICENSE.gpl-2.0.txt new file mode 100644 index 0000000..d159169 --- /dev/null +++ b/LICENSE.gpl-2.0.txt @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. (Some other Free Software Foundation software is covered by +the GNU Lesser General Public License instead.) You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +this service if you wish), that you receive source code or can get it +if you want it, that you can change the software or use pieces of it +in new free programs; and that you know you can do these things. + + To protect your rights, we need to make restrictions that forbid +anyone to deny you these rights or to ask you to surrender the rights. +These restrictions translate to certain responsibilities for you if you +distribute copies of the software, or if you modify it. + + For example, if you distribute copies of such a program, whether +gratis or for a fee, you must give the recipients all the rights that +you have. 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To prevent this, we have made it clear that any +patent must be licensed for everyone's free use or not licensed at all. + + The precise terms and conditions for copying, distribution and +modification follow. + + GNU GENERAL PUBLIC LICENSE + TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION + + 0. This License applies to any program or other work which contains +a notice placed by the copyright holder saying it may be distributed +under the terms of this General Public License. The "Program", below, +refers to any such program or work, and a "work based on the Program" +means either the Program or any derivative work under copyright law: +that is to say, a work containing the Program or a portion of it, +either verbatim or with modifications and/or translated into another +language. (Hereinafter, translation is included without limitation in +the term "modification".) Each licensee is addressed as "you". + +Activities other than copying, distribution and modification are not +covered by this License; they are outside its scope. The act of +running the Program is not restricted, and the output from the Program +is covered only if its contents constitute a work based on the +Program (independent of having been made by running the Program). +Whether that is true depends on what the Program does. + + 1. You may copy and distribute verbatim copies of the Program's +source code as you receive it, in any medium, provided that you +conspicuously and appropriately publish on each copy an appropriate +copyright notice and disclaimer of warranty; keep intact all the +notices that refer to this License and to the absence of any warranty; +and give any other recipients of the Program a copy of this License +along with the Program. + +You may charge a fee for the physical act of transferring a copy, and +you may at your option offer warranty protection in exchange for a fee. + + 2. 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But when you +distribute the same sections as part of a whole which is a work based +on the Program, the distribution of the whole must be on the terms of +this License, whose permissions for other licensees extend to the +entire whole, and thus to each and every part regardless of who wrote it. + +Thus, it is not the intent of this section to claim rights or contest +your rights to work written entirely by you; rather, the intent is to +exercise the right to control the distribution of derivative or +collective works based on the Program. + +In addition, mere aggregation of another work not based on the Program +with the Program (or with a work based on the Program) on a volume of +a storage or distribution medium does not bring the other work under +the scope of this License. + + 3. You may copy and distribute the Program (or a work based on it, +under Section 2) in object code or executable form under the terms of +Sections 1 and 2 above provided that you also do one of the following: + + a) Accompany it with the complete corresponding machine-readable + source code, which must be distributed under the terms of Sections + 1 and 2 above on a medium customarily used for software interchange; or, + + b) Accompany it with a written offer, valid for at least three + years, to give any third party, for a charge no more than your + cost of physically performing source distribution, a complete + machine-readable copy of the corresponding source code, to be + distributed under the terms of Sections 1 and 2 above on a medium + customarily used for software interchange; or, + + c) Accompany it with the information you received as to the offer + to distribute corresponding source code. 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The Free Software Foundation may publish revised and/or new versions +of the General Public License from time to time. Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. + +Each version is given a distinguishing version number. If the Program +specifies a version number of this License which applies to it and "any +later version", you have the option of following the terms and conditions +either of that version or of any later version published by the Free +Software Foundation. If the Program does not specify a version number of +this License, you may choose any version ever published by the Free Software +Foundation. + + 10. If you wish to incorporate parts of the Program into other free +programs whose distribution conditions are different, write to the author +to ask for permission. For software which is copyrighted by the Free +Software Foundation, write to the Free Software Foundation; we sometimes +make exceptions for this. Our decision will be guided by the two goals +of preserving the free status of all derivatives of our free software and +of promoting the sharing and reuse of software generally. + + NO WARRANTY + + 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY +FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN +OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES +PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED +OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS +TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE +PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, +REPAIR OR CORRECTION. + + 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR +REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING +OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED +TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY +YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER +PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE +POSSIBILITY OF SUCH DAMAGES. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/LICENSE.txt b/LICENSE.txt new file mode 100644 index 0000000..4581250 --- /dev/null +++ b/LICENSE.txt @@ -0,0 +1,16 @@ +typedsync - Type-safe synchronization primitives +Copyright (C) 2022-2023 Luke Shumaker + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; einther version 2 of the License, or (at +your option) any later version. + +This program is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +Along with this program, you should have received a copy of the GNU +General Public License (in the LICENSE.gpl-2.0.txt file). If not, see +. diff --git a/Makefile b/Makefile index c413091..1138bd3 100644 --- a/Makefile +++ b/Makefile @@ -1,4 +1,4 @@ -# Copyright (C) 2022 Luke Shumaker +# Copyright (C) 2022-2023 Luke Shumaker # # SPDX-License-Identifier: GPL-2.0-or-later @@ -18,26 +18,18 @@ lint: tools/bin/golangci-lint # generate -generate/files = COPYING.gpl-2.0.txt -generate/files += COPYING.gpl-3.0.txt -generate/files += COPYING.apache-2.0.txt +generate/files = LICENSE.gpl-2.0.txt generate: generate-clean - $(MAKE) -C lib/btrfs $(MAKE) $(generate/files) .PHONY: generate generate-clean: - $(MAKE) -C lib/btrfs clean rm -f $(generate/files) .PHONY: generate-clean -COPYING.gpl-2.0.txt: +LICENSE.gpl-2.0.txt: curl https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt > $@ -COPYING.gpl-3.0.txt: - curl https://www.gnu.org/licenses/gpl-3.0.txt > $@ -COPYING.apache-2.0.txt: - curl https://apache.org/licenses/LICENSE-2.0.txt > $@ # tools @@ -46,7 +38,7 @@ tools/bin/%: tools/src/%/pin.go tools/src/%/go.mod # go mod tidy -goversion = 1.19 +goversion = 1.18 go-mod-tidy: .PHONY: go-mod-tidy diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..bf43b51 --- /dev/null +++ b/go.mod @@ -0,0 +1,3 @@ +module git.lukeshu.com/go/typedsync + +go 1.18 diff --git a/lib/containers/syncmap.go b/lib/containers/syncmap.go deleted file mode 100644 index 74da4b3..0000000 --- a/lib/containers/syncmap.go +++ /dev/null @@ -1,53 +0,0 @@ -// Copyright (C) 2022-2023 Luke Shumaker -// -// SPDX-License-Identifier: GPL-2.0-or-later - -package containers - -import ( - "sync" -) - -type SyncMap[K comparable, V any] struct { - inner sync.Map -} - -func (m *SyncMap[K, V]) Delete(key K) { - m.inner.Delete(key) -} - -func (m *SyncMap[K, V]) Load(key K) (value V, ok bool) { - _value, ok := m.inner.Load(key) - if ok { - //nolint:forcetypeassert // Typed wrapper around untyped lib. - value = _value.(V) - } - return value, ok -} - -func (m *SyncMap[K, V]) LoadAndDelete(key K) (value V, loaded bool) { - _value, ok := m.inner.LoadAndDelete(key) - if ok { - //nolint:forcetypeassert // Typed wrapper around untyped lib. - value = _value.(V) - } - return value, ok -} - -func (m *SyncMap[K, V]) LoadOrStore(key K, value V) (actual V, loaded bool) { - _actual, loaded := m.inner.LoadOrStore(key, value) - //nolint:forcetypeassert // Typed wrapper around untyped lib. - actual = _actual.(V) - return actual, loaded -} - -func (m *SyncMap[K, V]) Range(f func(key K, value V) bool) { - m.inner.Range(func(key, value any) bool { - //nolint:forcetypeassert // Typed wrapper around untyped lib. - return f(key.(K), value.(V)) - }) -} - -func (m *SyncMap[K, V]) Store(key K, value V) { - m.inner.Store(key, value) -} diff --git a/lib/containers/syncpool.go b/lib/containers/syncpool.go deleted file mode 100644 index cb5398d..0000000 --- a/lib/containers/syncpool.go +++ /dev/null @@ -1,33 +0,0 @@ -// Copyright (C) 2022-2023 Luke Shumaker -// -// SPDX-License-Identifier: GPL-2.0-or-later - -package containers - -import ( - "sync" -) - -type SyncPool[T any] struct { - New func() T - - inner sync.Pool -} - -func (p *SyncPool[T]) Get() (val T, ok bool) { - _val := p.inner.Get() - switch { - case _val != nil: - //nolint:forcetypeassert // Typed wrapper around untyped lib. - return _val.(T), true - case p.New != nil: - return p.New(), true - default: - var zero T - return zero, false - } -} - -func (p *SyncPool[T]) Put(val T) { - p.inner.Put(val) -} diff --git a/lib/containers/syncvalue.go b/lib/containers/syncvalue.go deleted file mode 100644 index 160db3c..0000000 --- a/lib/containers/syncvalue.go +++ /dev/null @@ -1,67 +0,0 @@ -// Copyright (C) 2022-2023 Luke Shumaker -// -// SPDX-License-Identifier: GPL-2.0-or-later - -package containers - -import ( - "sync" -) - -// SyncValue is a typed equivalent of sync/atomic.Value. -// -// It is not actually a wrapper around sync/atomic.Value for -// allocation-performance reasons. -type SyncValue[T comparable] struct { - mu sync.Mutex - ok bool - val T -} - -// This uses a dumb mutex-based solution because -// -// 1. Performance is good enough, because in the fast-path mutexes -// use the same compare-and-swap as sync/atomic.Value; and because -// all of these methods are short we're unlikely to hit the -// mutex's slow path. -// -// 2. We could use sync/atomic.Pointer[T], which by itself would have -// the same performance characteristics as sync/atomic.Value but -// without the benefit of runtime_procPin()/runtime_procUnpin(). -// We want to avoid that because it means we're doing an -// allocation for every store/swap; avoiding that is our whole -// reason for not just wraping sync/atomic.Value. So then we'd -// want to use a SyncPool to reuse allocations; but (1) that adds -// more sync-overhead, and (2) it also gets trickier because we'd -// have to be careful about not adding a pointer back to the pool -// when load has grabbed the pointer but not yet dereferenced it. - -func (v *SyncValue[T]) Load() (val T, ok bool) { - v.mu.Lock() - defer v.mu.Unlock() - return v.val, v.ok -} - -func (v *SyncValue[T]) Store(val T) { - v.mu.Lock() - defer v.mu.Unlock() - v.val, v.ok = val, true -} - -func (v *SyncValue[T]) Swap(newV T) (oldV T, oldOK bool) { - v.mu.Lock() - defer v.mu.Unlock() - oldV, oldOK = v.val, v.ok - v.val, v.ok = newV, true - return -} - -func (v *SyncValue[T]) CompareAndSwap(oldV, newV T) (swapped bool) { - v.mu.Lock() - defer v.mu.Unlock() - if !v.ok || v.val != oldV { - return false - } - v.val = newV - return true -} diff --git a/map.go b/map.go new file mode 100644 index 0000000..5b53748 --- /dev/null +++ b/map.go @@ -0,0 +1,53 @@ +// Copyright (C) 2022-2023 Luke Shumaker +// +// SPDX-License-Identifier: GPL-2.0-or-later + +package typedsync + +import ( + "sync" +) + +type Map[K comparable, V any] struct { + inner sync.Map +} + +func (m *Map[K, V]) Delete(key K) { + m.inner.Delete(key) +} + +func (m *Map[K, V]) Load(key K) (value V, ok bool) { + _value, ok := m.inner.Load(key) + if ok { + //nolint:forcetypeassert // Typed wrapper around untyped lib. + value = _value.(V) + } + return value, ok +} + +func (m *Map[K, V]) LoadAndDelete(key K) (value V, loaded bool) { + _value, ok := m.inner.LoadAndDelete(key) + if ok { + //nolint:forcetypeassert // Typed wrapper around untyped lib. + value = _value.(V) + } + return value, ok +} + +func (m *Map[K, V]) LoadOrStore(key K, value V) (actual V, loaded bool) { + _actual, loaded := m.inner.LoadOrStore(key, value) + //nolint:forcetypeassert // Typed wrapper around untyped lib. + actual = _actual.(V) + return actual, loaded +} + +func (m *Map[K, V]) Range(f func(key K, value V) bool) { + m.inner.Range(func(key, value any) bool { + //nolint:forcetypeassert // Typed wrapper around untyped lib. + return f(key.(K), value.(V)) + }) +} + +func (m *Map[K, V]) Store(key K, value V) { + m.inner.Store(key, value) +} diff --git a/pool.go b/pool.go new file mode 100644 index 0000000..c196085 --- /dev/null +++ b/pool.go @@ -0,0 +1,33 @@ +// Copyright (C) 2022-2023 Luke Shumaker +// +// SPDX-License-Identifier: GPL-2.0-or-later + +package typedsync + +import ( + "sync" +) + +type Pool[T any] struct { + New func() T + + inner sync.Pool +} + +func (p *Pool[T]) Get() (val T, ok bool) { + _val := p.inner.Get() + switch { + case _val != nil: + //nolint:forcetypeassert // Typed wrapper around untyped lib. + return _val.(T), true + case p.New != nil: + return p.New(), true + default: + var zero T + return zero, false + } +} + +func (p *Pool[T]) Put(val T) { + p.inner.Put(val) +} diff --git a/tools/.gitignore b/tools/.gitignore new file mode 100644 index 0000000..ae3c172 --- /dev/null +++ b/tools/.gitignore @@ -0,0 +1 @@ +/bin/ diff --git a/tools/src/golangci-lint/go.mod b/tools/src/golangci-lint/go.mod index 118cee8..6461446 100644 --- a/tools/src/golangci-lint/go.mod +++ b/tools/src/golangci-lint/go.mod @@ -1,6 +1,6 @@ module local -go 1.19 +go 1.18 require github.com/golangci/golangci-lint v1.50.1 diff --git a/value.go b/value.go new file mode 100644 index 0000000..99c8876 --- /dev/null +++ b/value.go @@ -0,0 +1,67 @@ +// Copyright (C) 2022-2023 Luke Shumaker +// +// SPDX-License-Identifier: GPL-2.0-or-later + +package typedsync + +import ( + "sync" +) + +// Value is a typed equivalent of sync/atomic.Value. +// +// It is not actually a wrapper around sync/atomic.Value for +// allocation-performance reasons. +type Value[T comparable] struct { + mu sync.Mutex + ok bool + val T +} + +// This uses a dumb mutex-based solution because +// +// 1. Performance is good enough, because in the fast-path mutexes +// use the same compare-and-swap as sync/atomic.Value; and because +// all of these methods are short we're unlikely to hit the +// mutex's slow path. +// +// 2. We could use sync/atomic.Pointer[T], which by itself would have +// the same performance characteristics as sync/atomic.Value but +// without the benefit of runtime_procPin()/runtime_procUnpin(). +// We want to avoid that because it means we're doing an +// allocation for every store/swap; avoiding that is our whole +// reason for not just wraping sync/atomic.Value. So then we'd +// want to use a Pool to reuse allocations; but (1) that adds more +// sync-overhead, and (2) it also gets trickier because we'd have +// to be careful about not adding a pointer back to the pool when +// load has grabbed the pointer but not yet dereferenced it. + +func (v *Value[T]) Load() (val T, ok bool) { + v.mu.Lock() + defer v.mu.Unlock() + return v.val, v.ok +} + +func (v *Value[T]) Store(val T) { + v.mu.Lock() + defer v.mu.Unlock() + v.val, v.ok = val, true +} + +func (v *Value[T]) Swap(newV T) (oldV T, oldOK bool) { + v.mu.Lock() + defer v.mu.Unlock() + oldV, oldOK = v.val, v.ok + v.val, v.ok = newV, true + return +} + +func (v *Value[T]) CompareAndSwap(oldV, newV T) (swapped bool) { + v.mu.Lock() + defer v.mu.Unlock() + if !v.ok || v.val != oldV { + return false + } + v.val = newV + return true +} -- cgit v1.2.3-54-g00ecf