feat(concurrentqueue): add compat.concurrentqueue 1.0.5 - #278
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moodycamel::ConcurrentQueue — the lock-free MPMC queue, plus its blocking
sibling and a flat C API over both. Shape B (header-only): the three public
headers sit at the tarball root, so `include_dirs = {"*"}` plus an anchor TU
is the package; consumers write `#include <concurrentqueue.h>` exactly as
upstream's README shows.
The one compilable optional component — `c_api/`'s two extern "C" wrapper
TUs — sits behind a default-off `c-api` feature (the compat.cjson `utils`
precedent). Windows needs `MOODYCAMEL_STATIC` on BOTH sides: the header
defaults to `__declspec(dllimport)`, which is wrong for the package's own
TUs (they define the functions, and `cflags` never reaches a .cpp — hence
`cxxflags`) and for a static-archive consumer (hence the feature's
interface `defines`). The macro is only read under `#ifdef _WIN32`, so
defining it everywhere is inert on linux/macos. Verified in the emitted
compile_commands.json that all four TUs carry it.
Tests: tests/examples/concurrentqueue asserts FIFO order, bulk round-trips,
move-only elements, a blocking consumer that REALLY waits (empty-queue
wait_dequeue_timed must burn its 50ms timeout), and a 4x4 MPMC race checked
for exact-once delivery. tests/examples/concurrentqueue-c-api consumes the
feature and round-trips integers through the void* C API. Both members
register in the workspace manifest.
Verified locally with mcpp 2026.8.27.1 (CI pins 2026.8.27.2; the release
CDN times out from this host): both members green from cold; the gate is
real — a TU referencing moodycamel_cq_create against the default build
fails to LINK (undefined reference), and the default build's object dir
holds the anchor alone. No CN mirror: no GITCODE_TOKEN on this host, so the
descriptor uses the plain-string upstream url fallback and the descriptor
catalog entry lands in docs/descriptor-examples.md (+ zh), per the post-mcpplibs#277
README layout.
Co-Authored-By: Claude <noreply@anthropic.com>
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moodycamel::ConcurrentQueue1.0.5(cameron314/concurrentqueue)为 compat.concurrentqueue。concurrentqueue.h/blockingconcurrentqueue.h/lightweightsemaphore.h)都在 tarball 根,include_dirs = {"*"}+ anchor TU 即整包;消费者按上游 README 的写法#include <concurrentqueue.h>。c-api(默认关闭) —— 包里唯一可编译的可选组件:c_api/的两个extern "C"封装 TU(compat.cjsonutils先例)。tests/、benchmarks/自带main(),lib 目标不能收(对象会急切进入消费者链接)。MOODYCAMEL_STATIC双侧声明 —— C API 头未被告知时按__declspec(dllimport)声明,对包自身 TU(要定义函数;cflags到不了.cpp,故用cxxflags)与静态库消费者(feature 的接口defines)都不成立。宏只在#ifdef _WIN32内被读,linux/macos 上无效。{"BSD-2-Clause", "BSL-1.0"}。GITCODE_TOKEN,按回退方案用纯字符串 upstream url,mcpp-res/concurrentqueue留待维护者补充;mirror-cn-reachable对纯字符串 url 无新校验项。4d6368a27492d86011fde5ca0cf386dce7c49cd425aa3d9b063ca6ec373a6ef3(连算两次一致)。测试成员
tests/examples/concurrentqueue:单线程 FIFO、bulk 往返、ProducerToken、move-only 元素、阻塞消费者(空队列wait_dequeue_timed必须真的等满 50ms)、4×4 MPMC 竞争下逐值「恰好一次」。tests/examples/concurrentqueue-c-api:长式声明features = ["c-api"],整数经void*往返校验和比对(cq 与 bcq 句柄都是void*,装错队列会在这里暴露)。验证
mcpp test -p concurrentqueue→ test result ok(冷启动)mcpp test -p concurrentqueue-c-api→ test result ok(独立重编,feature 生效)moodycamel_cq_create的 TU 链接默认构建对象报undefined reference;默认构建的包对象目录里只有 anchor,无任何c_api/*.o。mcpp xpkg parse);compile_commands.json确认-DMOODYCAMEL_STATIC到达全部四个 TU。设计文档:
.agents/docs/2026-08-29-add-concurrentqueue-plan.md。目录条目落在docs/descriptor-examples.md(+ zh)的「header-only (with features)」行 —— README 在 #277 后不再承载逐包目录。🤖 Generated with Claude Code