{"id":113604,"date":"2026-10-06T23:17:02","date_gmt":"2026-10-06T15:17:02","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/113604.html"},"modified":"2026-10-06T23:17:02","modified_gmt":"2026-10-06T15:17:02","slug":"%e6%89%8b%e5%86%99%e4%b8%80%e4%b8%aa%e7%ba%bf%e7%a8%8b%e6%b1%a0%ef%bc%9a%e4%bb%bb%e5%8a%a1%e9%98%9f%e5%88%97%e3%80%81%e5%b7%a5%e4%bd%9c%e7%ba%bf%e7%a8%8b%e4%b8%8e%e5%81%9c%e6%ad%a2%e9%a1%ba%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/113604.html","title":{"rendered":"\u624b\u5199\u4e00\u4e2a\u7ebf\u7a0b\u6c60\uff1a\u4efb\u52a1\u961f\u5217\u3001\u5de5\u4f5c\u7ebf\u7a0b\u4e0e\u505c\u6b62\u987a\u5e8f\u7684\u4e09\u4e2a\u8bbe\u8ba1\u70b9"},"content":{"rendered":"

\u6bcf\u4e2a\u4efb\u52a1 new \u4e00\u4e2a std::thread \u662f\u5e76\u53d1\u7f16\u7a0b\u91cc\u6700\u8d35\u7684\u5077\u61d2\u65b9\u5f0f：\u7ebf\u7a0b\u521b\u5efa\u8981\u8d70\u7cfb\u7edf\u8c03\u7528，\u6808\u7a7a\u95f4\u6309\u5146\u7b97，\u9500\u6bc1\u53c8\u8981\u518d\u6765\u4e00\u904d\u3002\u5f53\u4efb\u52a1\u672c\u8eab\u53ea\u6709\u51e0\u5fae\u79d2\u65f6，\u4f60\u82b1\u5728\u300c\u9020\u7ebf\u7a0b\u300d\u4e0a\u7684\u65f6\u95f4\u4f1a\u6bd4\u5e72\u6d3b\u591a\u51e0\u5341\u500d\u3002 \u7ebf\u7a0b\u6c60\u7684\u601d\u8def\u5f88\u6734\u7d20：\u7ebf\u7a0b\u53ea\u521b\u5efa\u4e00\u6b21，\u4efb\u52a1\u6392\u961f，\u8c01\u7a7a\u8c01\u53d6\u3002\u8fd9\u7bc7\u4ece\u96f6\u628a\u5b83\u5199\u51fa\u6765，\u7136\u540e\u628a\u4e09\u4e2a\u6700\u5bb9\u6613\u5199\u9519\u7684\u8bbe\u8ba1\u70b9\u8bb2\u900f\u3002<\/p>\n

1. \u5f15\u5b50：\u7b97\u4e00\u7b14\u7ebf\u7a0b\u7684\u8d26<\/h3>\n

\/\/ \u7247\u6bb5：\u6bcf\u4e2a\u4efb\u52a1\u4e00\u4e2a\u7ebf\u7a0b \u2014\u2014 \u53cd\u4f8b，\u4e0d\u8981\u8fd9\u4e48\u5199<\/span>
\nfor<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> 10000<\/span>;<\/span> ++<\/span>i)<\/span> {<\/span>
\n std::<\/span>thread<\/span>(<\/span>[<\/span>i]<\/span> {<\/span> do_something_small<\/span>(<\/span>i)<\/span>;<\/span> }<\/span>)<\/span>.<\/span>detach<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u4e00\u4e07\u6b21\u521b\u5efa + \u4e00\u4e07\u6b21\u9500\u6bc1<\/span>
\n}<\/span><\/p>\n

\u8fd9\u6bb5\u4ee3\u7801\u6709\u4e09\u4e2a\u95ee\u9898\u53e0\u5728\u4e00\u8d77：\u2460 \u7ebf\u7a0b\u6570\u4e0d\u53d7\u63a7，\u4efb\u52a1\u4e00\u591a\u76f4\u63a5\u628a\u7cfb\u7edf\u7ebf\u7a0b\u4e0a\u9650\u6253\u6ee1（std::system_error: Resource temporarily unavailable \u5c31\u662f\u8fd9\u4e48\u6765\u7684）；\u2461 \u521b\u5efa\/\u9500\u6bc1\u7684\u5f00\u9500\u548c\u4efb\u52a1\u91cf\u6210\u6b63\u6bd4，\u800c\u4e0d\u662f\u548c\u300c\u5cf0\u503c\u5e76\u53d1\u5ea6\u300d\u6210\u6b63\u6bd4；\u2462 \u62ff\u4e0d\u5230\u8fd4\u56de\u503c\u3001\u63a5\u4e0d\u4f4f\u5f02\u5e38（\u300astd::async\u3001future\u3001promise：\u5f02\u6b65\u4efb\u52a1\u7684\u8fd4\u56de\u503c\u3001\u5f02\u5e38\u4e0e\u4e09\u4e2a\u7ecf\u5178\u5751\u300b\u8bb2\u8fc7）\u3002<\/p>\n

\u8d26\u5927\u6982\u662f\u8fd9\u4e2a\u91cf\u7ea7：<\/p>\n\n\u64cd\u4f5c\u5927\u81f4\u91cf\u7ea7\u8bf4\u660e<\/tr>\n\n\n\n\n\n
\u521b\u5efa\/\u9500\u6bc1\u4e00\u4e2a\u7ebf\u7a0b<\/td>\n\u6570\u5341\u5fae\u79d2<\/td>\n\u5185\u6838\u6001\u64cd\u4f5c，\u542b\u6808\u6620\u5c04<\/td>\n<\/tr>\n
\u4e00\u6b21\u65e0\u7ade\u4e89\u7684 mutex \u52a0\u89e3\u9501<\/td>\n\u6570\u5341\u7eb3\u79d2<\/td>\n\u7528\u6237\u6001\u539f\u5b50\u64cd\u4f5c + \u5c11\u91cf\u6307\u4ee4<\/td>\n<\/tr>\n
\u4e00\u6b21 notify + \u5524\u9192<\/td>\n\u5fae\u79d2\u4ee5\u5185<\/td>\n\u6709\u7ade\u4e89\u65f6\u4f1a\u8d70 futex \u7cfb\u7edf\u8c03\u7528<\/td>\n<\/tr>\n
\u4e00\u4e2a\u300c\u5fae\u4e0d\u8db3\u9053\u300d\u7684\u4efb\u52a1\u672c\u8eab<\/td>\n\u53ef\u80fd\u53ea\u6709\u51e0\u5341\u7eb3\u79d2<\/td>\n\u5178\u578b\u5982\u52a0\u4e00\u6b21\u8ba1\u6570<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u7ed3\u8bba\u5f88\u6e05\u695a：\u4efb\u52a1\u8d8a\u77ed，\u7ebf\u7a0b\u6c60\u7684\u6536\u76ca\u8d8a\u5927\u3002\u4e09\u6761\u8def\u91cc，detach \u662f\u5931\u63a7，\u9010\u4efb\u52a1\u5efa\u7ebf\u7a0b\u662f\u6d6a\u8d39，\u7ebf\u7a0b\u6c60\u624d\u662f\u7a33\u6001\u3002<\/p>\n

\u5b98\u65b9\u6587\u6863：std::thread \u2014 cppreference \u00b7 std::condition_variable \u2014 cppreference<\/p>\n

2. \u7ed3\u6784\u957f\u4ec0\u4e48\u6837<\/h3>\n

\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n \u2502 ThreadPool \u2502
\n \u63d0\u4ea4\u4efb\u52a1 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25ba \u2502 enqueue(task) \u2502
\n （\u4efb\u610f\u7ebf\u7a0b\u90fd\u80fd\u8c03） \u2502 \u2502 \u2502
\n \u2502 \u25bc \u2460 \u52a0\u9501，\u628a\u4efb\u52a1\u63a8\u8fdb\u961f\u5217 \u2502
\n \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502
\n \u2502 \u2502 tasks_ : std::queue<…> \u2502 \u2502
\n \u2502 \u2502 [t3][t2][t1] \u2190 \u5148\u8fdb\u5148\u51fa \u2502 \u4efb\u52a1\u961f\u5217 \u2502
\n \u2502 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502
\n \u2502 \u2502 \u2461 \u89e3\u9501，\u518d notify_one \u2502
\n \u2502 \u25bc \u2502
\n \u2502 \u2554\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2557 \u2502
\n \u2502 \u2551 mutex_ + cv_ \u4fdd\u62a4\u961f\u5217\u4e0e\u6807\u5fd7 \u2551 \u2502
\n \u2502 \u255a\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u255d \u2502
\n \u2502 \u2502 \u2462 \u67d0\u4e00\u4e2a\u6b63\u5728 wait \u7684\u5de5\u4f5c\u7ebf\u7a0b\u88ab\u5524\u9192 \u2502
\n \u2502 \u25bc \u2502
\n \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502
\n \u2502 \u2502 worker 0 \u2502 \u2502 worker 1 \u2502 \u2502 worker 2 \u2502 … \u2502
\n \u2502 \u2502 \u5faa\u73af： \u2502 \u2502 \u5faa\u73af： \u2502 \u2502 \u5faa\u73af： \u2502 \u2502
\n \u2502 \u2502 \u7b49 \u2192 \u53d6 \u2502 \u2502 \u7b49 \u2192 \u53d6 \u2502 \u2502 \u7b49 \u2192 \u53d6 \u2502 \u2502
\n \u2502 \u2502 \u2192 \u6267\u884c \u2502 \u2502 \u2192 \u6267\u884c \u2502 \u2502 \u2192 \u6267\u884c \u2502 \u2502
\n \u2502 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502
\n \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
\n \u2191 \u7ebf\u7a0b\u53ea\u5728\u6784\u9020\u65f6\u521b\u5efa，\u4e4b\u540e\u88ab\u4efb\u52a1\u53cd\u590d\u590d\u7528<\/p>\n

\u56db\u4e2a\u96f6\u4ef6\u7f3a\u4e00\u4e0d\u53ef：\u4efb\u52a1\u961f\u5217（\u5b58\u653e\u5f85\u529e，std::queue \u7684 FIFO \u8bed\u4e49\u5929\u7136\u516c\u5e73）\u3001\u5de5\u4f5c\u7ebf\u7a0b\u6570\u7ec4（\u590d\u7528\u5b9e\u4f53）\u3001std::mutex（\u4fdd\u62a4\u961f\u5217\u548c\u505c\u6b62\u6807\u5fd7）\u3001std::condition_variable（\u8ba9\u7a7a\u95f2\u7ebf\u7a0b\u771f\u6b63\u7761\u7740，\u800c\u4e0d\u662f\u5fd9\u7b49\u70e7 CPU）\u3002<\/p>\n\n\u7ec4\u4ef6\u9009\u578b\u4e3a\u4ec0\u4e48<\/tr>\n\n\n\n\n\n\n
\u4efb\u52a1\u5bb9\u5668<\/td>\nstd::queue<std::function<void()>><\/td>\n\u9700\u8981 FIFO，\u4e14\u8981\u80fd\u88c5\u4efb\u610f\u53ef\u8c03\u7528\u5bf9\u8c61<\/td>\n<\/tr>\n
\u4efb\u52a1\u7c7b\u578b<\/td>\nstd::function<void()><\/td>\n\u62b9\u5e73 lambda \/ \u51fd\u6570\u6307\u9488 \/ \u4eff\u51fd\u6570\u7684\u7c7b\u578b\u5dee\u5f02<\/td>\n<\/tr>\n
\u540c\u6b65<\/td>\nstd::mutex + std::condition_variable<\/td>\n\u961f\u5217\u8981\u4e92\u65a5，\u7ebf\u7a0b\u8981\u80fd\u88ab\u9ad8\u6548\u5524\u9192<\/td>\n<\/tr>\n
\u505c\u6b62\u6807\u5fd7<\/td>\nbool + \u540c\u4e00\u628a\u9501\u4fdd\u62a4（\u6216 std::atomic<bool>）<\/td>\n\u88ab\u9501\u4fdd\u62a4\u65f6\u8bfb\u5199\u5929\u7136\u4e92\u65a5，\u4e0d\u5fc5\u518d\u591a\u4e00\u4e2a\u539f\u5b50\u91cf<\/td>\n<\/tr>\n
\u8fd4\u56de\u503c\u901a\u9053<\/td>\nstd::packaged_task<…> + std::future<…><\/td>\n\u8ba9 enqueue \u7684\u8c03\u7528\u65b9\u62ff\u5230\u7ed3\u679c\u548c\u5f02\u5e38<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

3. \u6700\u5c0f\u53ef\u7528\u7248\u672c：\u5148\u8dd1\u8d77\u6765<\/h3>\n

\u5148\u505a\u4e00\u7248 enqueue \u53ea\u6536 std::function<void()> \u7684，\u628a\u9aa8\u67b6\u8dd1\u901a：<\/p>\n

\/\/ pool_min.cpp \u2014 \u7f16\u8bd1: g++ -std=c++17 -Wall -O2 -pthread pool_min.cpp -o pool_min<\/span>
\n#<\/span>include<\/span> <atomic><\/span><\/span>
\n#<\/span>include<\/span> <condition_variable><\/span><\/span>
\n#<\/span>include<\/span> <cstdio><\/span><\/span>
\n#<\/span>include<\/span> <functional><\/span><\/span>
\n#<\/span>include<\/span> <mutex><\/span><\/span>
\n#<\/span>include<\/span> <queue><\/span><\/span>
\n#<\/span>include<\/span> <thread><\/span><\/span>
\n#<\/span>include<\/span> <utility><\/span><\/span>
\n#<\/span>include<\/span> <vector><\/span><\/span><\/p>\n

class<\/span> ThreadPool<\/span> {<\/span>
\npublic<\/span>:<\/span>
\n explicit<\/span> ThreadPool<\/span>(<\/span>std::<\/span>size_t workers)<\/span> {<\/span>
\n workers_.<\/span>reserve<\/span>(<\/span>workers)<\/span>;<\/span>
\n for<\/span> (<\/span>std::<\/span>size_t i =<\/span> 0<\/span>;<\/span> i <<\/span> workers;<\/span> ++<\/span>i)<\/span> {<\/span>
\n workers_.<\/span>emplace_back<\/span>(<\/span>[<\/span>this<\/span>]<\/span> {<\/span> worker_loop<\/span>(<\/span>)<\/span>;<\/span> }<\/span>)<\/span>;<\/span> \/\/ \u6784\u9020\u5373\u5f00\u5de5<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

~<\/span>ThreadPool<\/span>(<\/span>)<\/span> {<\/span> shutdown<\/span>(<\/span>)<\/span>;<\/span> }<\/span><\/p>\n

ThreadPool<\/span>(<\/span>const<\/span> ThreadPool&<\/span>)<\/span> =<\/span> delete<\/span>;<\/span> \/\/ \u7ebf\u7a0b\u4e0d\u53ef\u62f7\u8d1d，\u6c60\u4e5f\u4e0d\u8be5<\/span>
\n ThreadPool&<\/span> operator<\/span>=<\/span>(<\/span>const<\/span> ThreadPool&<\/span>)<\/span> =<\/span> delete<\/span>;<\/span><\/p>\n

void<\/span> enqueue<\/span>(<\/span>std::<\/span>function<<\/span>void<\/span>(<\/span>)<\/span>><\/span> task)<\/span> {<\/span>
\n {<\/span>
\n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>mutex_)<\/span>;<\/span>
\n tasks_.<\/span>push<\/span>(<\/span>std::<\/span>move<\/span>(<\/span>task)<\/span>)<\/span>;<\/span> \/\/ \u2460 \u6301\u9501\u6539\u961f\u5217<\/span>
\n }<\/span>
\n cv_.<\/span>notify_one<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u2461 \u89e3\u9501\u540e\u518d\u901a\u77e5<\/span>
\n }<\/span><\/p>\n

private<\/span>:<\/span>
\n void<\/span> shutdown<\/span>(<\/span>)<\/span> {<\/span>
\n {<\/span>
\n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>mutex_)<\/span>;<\/span>
\n stopping_ =<\/span> true<\/span>;<\/span> \/\/ \u2460 \u5148\u7f6e\u505c\u6b62\u6807\u5fd7（\u6301\u9501）<\/span>
\n }<\/span>
\n cv_.<\/span>notify_all<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u2461 \u518d\u5524\u9192\u6240\u6709\u7761\u7740\u7684\u7ebf\u7a0b<\/span>
\n for<\/span> (<\/span>auto<\/span>&<\/span> worker :<\/span> workers_)<\/span> {<\/span> \/\/ \u2462 \u6700\u540e join<\/span>
\n if<\/span> (<\/span>worker.<\/span>joinable<\/span>(<\/span>)<\/span>)<\/span> worker.<\/span>join<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

void<\/span> worker_loop<\/span>(<\/span>)<\/span> {<\/span>
\n for<\/span> (<\/span>;<\/span>;<\/span>)<\/span> {<\/span>
\n std::<\/span>function<<\/span>void<\/span>(<\/span>)<\/span>><\/span> task;<\/span>
\n {<\/span>
\n std::<\/span>unique_lock<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>mutex_)<\/span>;<\/span>
\n cv_.<\/span>wait<\/span>(<\/span>lock,<\/span> [<\/span>this<\/span>]<\/span> {<\/span> return<\/span> stopping_ ||<\/span> !<\/span>tasks_.<\/span>empty<\/span>(<\/span>)<\/span>;<\/span> }<\/span>)<\/span>;<\/span>
\n if<\/span> (<\/span>stopping_ &&<\/span> tasks_.<\/span>empty<\/span>(<\/span>)<\/span>)<\/span> return<\/span>;<\/span> \/\/ \u505c\u6b62\u4e14\u5df2\u6392\u7a7a \u2192 \u624d\u80fd\u9000\u51fa<\/span>
\n task =<\/span> std::<\/span>move<\/span>(<\/span>tasks_.<\/span>front<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n tasks_.<\/span>pop<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n task<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u2463 \u5fc5\u987b\u5728\u9501\u5916\u6267\u884c<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

std::<\/span>mutex mutex_;<\/span>
\n std::<\/span>condition_variable cv_;<\/span>
\n std::<\/span>queue<<\/span>std::<\/span>function<<\/span>void<\/span>(<\/span>)<\/span>>><\/span> tasks_;<\/span>
\n std::<\/span>vector<<\/span>std::<\/span>thread><\/span> workers_;<\/span>
\n bool<\/span> stopping_{<\/span>false<\/span>}<\/span>;<\/span> \/\/ \u53d7 mutex_ \u4fdd\u62a4，\u65e0\u9700 atomic<\/span>
\n}<\/span>;<\/span><\/p>\n

int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n constexpr<\/span> int<\/span> kTasks =<\/span> 100<\/span>;<\/span>
\n std::<\/span>atomic<<\/span>int<\/span>><\/span> done{<\/span>0<\/span>}<\/span>;<\/span><\/p>\n

{<\/span>
\n ThreadPool pool<\/span>(<\/span>4<\/span>)<\/span>;<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> kTasks;<\/span> ++<\/span>i)<\/span> {<\/span>
\n pool.<\/span>enqueue<\/span>(<\/span>[<\/span>&<\/span>done]<\/span> {<\/span> done.<\/span>fetch_add<\/span>(<\/span>1<\/span>,<\/span> std::<\/span>memory_order_relaxed)<\/span>;<\/span> }<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span> \/\/ pool \u6790\u6784 \u2192 \u7b49\u6240\u6709\u5df2\u63d0\u4ea4\u4efb\u52a1\u8dd1\u5b8c<\/span><\/p>\n

std::<\/span>printf<\/span>(<\/span>"\u63d0\u4ea4 %d \u4e2a\u4efb\u52a1, \u5b8c\u6210 %d \u4e2a\\\\n"<\/span>,<\/span> kTasks,<\/span> done.<\/span>load<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u63d0\u4ea4 100 \u4e2a\u4efb\u52a1, \u5b8c\u6210 100 \u4e2a<\/p>\n

100 == 100 \u662f\u786e\u5b9a\u7684，\u548c 4 \u4e2a\u5de5\u4f5c\u7ebf\u7a0b\u8c01\u5148\u8c01\u540e\u65e0\u5173 \u2014\u2014 \u8fd9\u662f\u6790\u6784\u5fc5\u987b\u628a\u961f\u5217\u6392\u7a7a\u6362\u6765\u7684\u4fdd\u8bc1\u3002<\/p>\n

4. \u8bbe\u8ba1\u70b9 \u2460：\u8ba9\u8c03\u7528\u65b9\u62ff\u5230\u8fd4\u56de\u503c<\/h3>\n

\u4e0a\u9762\u7684 enqueue \u53ea\u80fd\u6536 void()，\u7528\u5b8c\u5c31\u662f\u300c\u6254\u51fa\u53bb\u4e0d\u95ee\u7ed3\u679c\u300d\u3002\u6807\u51c6\u505a\u6cd5\u662f\u628a\u5b83\u6539\u6210\u53ef\u53d8\u53c2\u6570\u6a21\u677f，\u5185\u90e8\u7528 std::packaged_task \u5305\u4e00\u5c42，\u8fd4\u56de std::future：<\/p>\n

\/\/ \u7247\u6bb5：enqueue \u7684\u6a21\u677f\u7248\u6838\u5fc3<\/span>
\ntemplate<\/span> <<\/span>typename<\/span> F<\/span>,<\/span> typename<\/span>.<\/span>.<\/span>.<\/span> Args><\/span>
\nauto<\/span> enqueue<\/span>(<\/span>F&&<\/span> func,<\/span> Args&&<\/span>.<\/span>.<\/span>.<\/span> args)<\/span>
\n -><\/span> std::<\/span>future<<\/span>std::<\/span>invoke_result_t<<\/span>F,<\/span> Args.<\/span>.<\/span>.<\/span>>><\/span> {<\/span>
\n using<\/span> Result =<\/span> std::<\/span>invoke_result_t<<\/span>F,<\/span> Args.<\/span>.<\/span>.<\/span>><\/span>;<\/span><\/p>\n

auto<\/span> bound =<\/span> std::<\/span>make_shared<\/span><<\/span>std::<\/span>packaged_task<<\/span>Result<\/span>(<\/span>)<\/span>>><\/span><\/span><\/span>(<\/span> \/\/ \u2460 \u5305\u8d77\u6765<\/span>
\n [<\/span>func =<\/span> std::<\/span>forward<\/span><<\/span>F><\/span><\/span><\/span>(<\/span>func)<\/span>,<\/span>
\n args =<\/span> std::<\/span>make_tuple<\/span>(<\/span>std::<\/span>forward<\/span><<\/span>Args><\/span><\/span><\/span>(<\/span>args)<\/span>.<\/span>.<\/span>.<\/span>)<\/span>]<\/span>(<\/span>)<\/span> mutable<\/span> -><\/span> Result {<\/span>
\n return<\/span> std::<\/span>apply<\/span>(<\/span>func,<\/span> std::<\/span>move<\/span>(<\/span>args)<\/span>)<\/span>;<\/span> \/\/ \u53c2\u6570\u4ece tuple \u91cc\u644a\u5f00<\/span>
\n }<\/span>)<\/span>;<\/span><\/p>\n

std::<\/span>future<<\/span>Result><\/span> result =<\/span> bound-><\/span>get_future<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u2461 \u5148\u53d6 future<\/span>
\n {<\/span>
\n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>mutex_)<\/span>;<\/span>
\n tasks_.<\/span>emplace<\/span>(<\/span>[<\/span>bound]<\/span> {<\/span> (<\/span>*<\/span>bound)<\/span>(<\/span>)<\/span>;<\/span> }<\/span>)<\/span>;<\/span> \/\/ \u2462 \u518d\u5165\u961f<\/span>
\n }<\/span>
\n cv_.<\/span>notify_one<\/span>(<\/span>)<\/span>;<\/span>
\n return<\/span> result;<\/span> \/\/ \u2463 \u628a\u901a\u9053\u4ea4\u7ed9\u8c03\u7528\u65b9<\/span>
\n}<\/span><\/p>\n

\u8fd9\u6bb5\u4ee3\u7801\u91cc\u6709\u56db\u4e2a\u5fc5\u987b\u8fd9\u4e48\u5199\u7684\u5730\u65b9，\u6bcf\u4e00\u4e2a\u90fd\u662f\u8e29\u51fa\u6765\u7684：<\/p>\n\n\u5199\u6cd5\u4e0d\u8fd9\u4e48\u5199\u4f1a\u600e\u6837<\/tr>\n\n\n\n\n\n
std::make_shared<std::packaged_task<…>><\/td>\npackaged_task \u53ea\u53ef\u79fb\u52a8，\u88c5\u4e0d\u8fdb std::function<void()>；\u7528 shared_ptr \u5305\u4e00\u5c42\u540e lambda \u53d8\u6210\u53ef\u62f7\u8d1d，\u95ee\u9898\u6d88\u5931<\/td>\n<\/tr>\n
std::make_tuple + std::apply \u800c\u4e0d\u662f std::bind<\/td>\nstd::bind \u4f1a\u4e22\u5931\u5f15\u7528\u4f20\u9012\u3001\u5bf9\u91cd\u8f7d\u51fd\u6570\u4e5f\u96be\u5904\u7406；\u6cdb\u578b lambda + apply \u662f C++17 \u7684\u76f4\u7403\u5199\u6cd5<\/td>\n<\/tr>\n
\u5148 get_future()，\u518d\u5165\u961f<\/td>\n\u987a\u5e8f\u53cd\u8fc7\u6765\u4f1a\u51fa\u73b0\u300c\u4efb\u52a1\u5df2\u88ab\u6267\u884c\u5b8c，future \u8fd8\u6ca1\u5efa\u300d\u7684\u7a97\u53e3（\u5c11\u6570\u5b9e\u73b0\u4f1a\u76f4\u63a5\u629b std::future_error）<\/td>\n<\/tr>\n
lambda \u6807 mutable<\/td>\n\u6355\u83b7\u8fdb\u6765\u7684 args \u662f\u6210\u5458，std::apply \u8981\u628a\u5b83\u79fb\u51fa\u53bb，\u4e0d\u6539 mutable \u7f16\u8bd1\u4e0d\u8fc7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\/\/ pool_future.cpp \u2014 \u7f16\u8bd1: g++ -std=c++17 -Wall -O2 -pthread pool_future.cpp -o pool_future<\/span>
\n#<\/span>include<\/span> <atomic><\/span><\/span>
\n#<\/span>include<\/span> <condition_variable><\/span><\/span>
\n#<\/span>include<\/span> <cstdio><\/span><\/span>
\n#<\/span>include<\/span> <functional><\/span><\/span>
\n#<\/span>include<\/span> <future><\/span><\/span>
\n#<\/span>include<\/span> <memory><\/span><\/span>
\n#<\/span>include<\/span> <mutex><\/span><\/span>
\n#<\/span>include<\/span> <queue><\/span><\/span>
\n#<\/span>include<\/span> <stdexcept><\/span><\/span>
\n#<\/span>include<\/span> <thread><\/span><\/span>
\n#<\/span>include<\/span> <tuple><\/span><\/span>
\n#<\/span>include<\/span> <type_traits><\/span><\/span>
\n#<\/span>include<\/span> <utility><\/span><\/span>
\n#<\/span>include<\/span> <vector><\/span><\/span><\/p>\n

class<\/span> ThreadPool<\/span> {<\/span>
\npublic<\/span>:<\/span>
\n explicit<\/span> ThreadPool<\/span>(<\/span>std::<\/span>size_t workers)<\/span> {<\/span>
\n workers_.<\/span>reserve<\/span>(<\/span>workers)<\/span>;<\/span>
\n for<\/span> (<\/span>std::<\/span>size_t i =<\/span> 0<\/span>;<\/span> i <<\/span> workers;<\/span> ++<\/span>i)<\/span> {<\/span>
\n workers_.<\/span>emplace_back<\/span>(<\/span>[<\/span>this<\/span>]<\/span> {<\/span> worker_loop<\/span>(<\/span>)<\/span>;<\/span> }<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

~<\/span>ThreadPool<\/span>(<\/span>)<\/span> {<\/span> shutdown<\/span>(<\/span>)<\/span>;<\/span> }<\/span><\/p>\n

ThreadPool<\/span>(<\/span>const<\/span> ThreadPool&<\/span>)<\/span> =<\/span> delete<\/span>;<\/span>
\n ThreadPool&<\/span> operator<\/span>=<\/span>(<\/span>const<\/span> ThreadPool&<\/span>)<\/span> =<\/span> delete<\/span>;<\/span><\/p>\n

template<\/span> <<\/span>typename<\/span> F<\/span>,<\/span> typename<\/span>.<\/span>.<\/span>.<\/span> Args><\/span>
\n auto<\/span> enqueue<\/span>(<\/span>F&&<\/span> func,<\/span> Args&&<\/span>.<\/span>.<\/span>.<\/span> args)<\/span>
\n -><\/span> std::<\/span>future<<\/span>std::<\/span>invoke_result_t<<\/span>F,<\/span> Args.<\/span>.<\/span>.<\/span>>><\/span> {<\/span>
\n using<\/span> Result =<\/span> std::<\/span>invoke_result_t<<\/span>F,<\/span> Args.<\/span>.<\/span>.<\/span>><\/span>;<\/span><\/p>\n

auto<\/span> bound =<\/span> std::<\/span>make_shared<\/span><<\/span>std::<\/span>packaged_task<<\/span>Result<\/span>(<\/span>)<\/span>>><\/span><\/span><\/span>(<\/span>
\n [<\/span>func =<\/span> std::<\/span>forward<\/span><<\/span>F><\/span><\/span><\/span>(<\/span>func)<\/span>,<\/span>
\n args =<\/span> std::<\/span>make_tuple<\/span>(<\/span>std::<\/span>forward<\/span><<\/span>Args><\/span><\/span><\/span>(<\/span>args)<\/span>.<\/span>.<\/span>.<\/span>)<\/span>]<\/span>(<\/span>)<\/span> mutable<\/span> -><\/span> Result {<\/span>
\n return<\/span> std::<\/span>apply<\/span>(<\/span>func,<\/span> std::<\/span>move<\/span>(<\/span>args)<\/span>)<\/span>;<\/span>
\n }<\/span>)<\/span>;<\/span><\/p>\n

std::<\/span>future<<\/span>Result><\/span> result =<\/span> bound-><\/span>get_future<\/span>(<\/span>)<\/span>;<\/span>
\n {<\/span>
\n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>mutex_)<\/span>;<\/span>
\n tasks_.<\/span>emplace<\/span>(<\/span>[<\/span>bound]<\/span> {<\/span> (<\/span>*<\/span>bound)<\/span>(<\/span>)<\/span>;<\/span> }<\/span>)<\/span>;<\/span>
\n }<\/span>
\n cv_.<\/span>notify_one<\/span>(<\/span>)<\/span>;<\/span>
\n return<\/span> result;<\/span>
\n }<\/span><\/p>\n

private<\/span>:<\/span>
\n void<\/span> shutdown<\/span>(<\/span>)<\/span> {<\/span>
\n {<\/span>
\n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>mutex_)<\/span>;<\/span>
\n stopping_ =<\/span> true<\/span>;<\/span>
\n }<\/span>
\n cv_.<\/span>notify_all<\/span>(<\/span>)<\/span>;<\/span>
\n for<\/span> (<\/span>auto<\/span>&<\/span> worker :<\/span> workers_)<\/span> {<\/span>
\n if<\/span> (<\/span>worker.<\/span>joinable<\/span>(<\/span>)<\/span>)<\/span> worker.<\/span>join<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

void<\/span> worker_loop<\/span>(<\/span>)<\/span> {<\/span>
\n for<\/span> (<\/span>;<\/span>;<\/span>)<\/span> {<\/span>
\n std::<\/span>function<<\/span>void<\/span>(<\/span>)<\/span>><\/span> task;<\/span>
\n {<\/span>
\n std::<\/span>unique_lock<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>mutex_)<\/span>;<\/span>
\n cv_.<\/span>wait<\/span>(<\/span>lock,<\/span> [<\/span>this<\/span>]<\/span> {<\/span> return<\/span> stopping_ ||<\/span> !<\/span>tasks_.<\/span>empty<\/span>(<\/span>)<\/span>;<\/span> }<\/span>)<\/span>;<\/span>
\n if<\/span> (<\/span>stopping_ &&<\/span> tasks_.<\/span>empty<\/span>(<\/span>)<\/span>)<\/span> return<\/span>;<\/span>
\n task =<\/span> std::<\/span>move<\/span>(<\/span>tasks_.<\/span>front<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n tasks_.<\/span>pop<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n task<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span>
\n }<\/span><\/p>\n

std::<\/span>mutex mutex_;<\/span>
\n std::<\/span>condition_variable cv_;<\/span>
\n std::<\/span>queue<<\/span>std::<\/span>function<<\/span>void<\/span>(<\/span>)<\/span>>><\/span> tasks_;<\/span>
\n std::<\/span>vector<<\/span>std::<\/span>thread><\/span> workers_;<\/span>
\n bool<\/span> stopping_{<\/span>false<\/span>}<\/span>;<\/span>
\n}<\/span>;<\/span><\/p>\n

int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
\n ThreadPool pool<\/span>(<\/span>3<\/span>)<\/span>;<\/span><\/p>\n

std::<\/span>vector<<\/span>std::<\/span>future<<\/span>long<\/span> long<\/span>>><\/span> futures;<\/span>
\n futures.<\/span>reserve<\/span>(<\/span>10<\/span>)<\/span>;<\/span>
\n for<\/span> (<\/span>int<\/span> i =<\/span> 1<\/span>;<\/span> i <=<\/span> 10<\/span>;<\/span> ++<\/span>i)<\/span> {<\/span>
\n futures.<\/span>push_back<\/span>(<\/span>pool.<\/span>enqueue<\/span>(<\/span>[<\/span>]<\/span>(<\/span>int<\/span> x)<\/span> {<\/span> return<\/span> static_cast<\/span><<\/span>long<\/span> long<\/span>><\/span><\/span><\/span>(<\/span>x)<\/span> *<\/span> x;<\/span> }<\/span>,<\/span> i)<\/span>)<\/span>;<\/span>
\n }<\/span><\/p>\n

long<\/span> long<\/span> total =<\/span> 0<\/span>;<\/span>
\n for<\/span> (<\/span>auto<\/span>&<\/span> fut :<\/span> futures)<\/span> total +=<\/span> fut.<\/span>get<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u6bcf\u4e2a future \u53ea get \u4e00\u6b21<\/span>
\n std::<\/span>printf<\/span>(<\/span>"1..10 \u7684\u5e73\u65b9\u548c = %lld, \u671f\u671b = %d\\\\n"<\/span>,<\/span> total,<\/span> 385<\/span>)<\/span>;<\/span><\/p>\n

\/\/ \u4efb\u52a1\u5185\u90e8\u629b\u51fa\u7684\u5f02\u5e38，\u540c\u6837\u6cbf\u7740 future \u4f20\u56de\u8c03\u7528\u65b9<\/span>
\n std::<\/span>future<<\/span>int<\/span>><\/span> bad =<\/span> pool.<\/span>enqueue<\/span>(<\/span>[<\/span>]<\/span>(<\/span>)<\/span> -><\/span> int<\/span> {<\/span>
\n throw<\/span> std::<\/span>runtime_error<\/span>(<\/span>"\u4efb\u52a1\u5185\u90e8\u51fa\u9519"<\/span>)<\/span>;<\/span>
\n }<\/span>)<\/span>;<\/span>
\n try<\/span> {<\/span>
\n bad.<\/span>get<\/span>(<\/span>)<\/span>;<\/span>
\n }<\/span> catch<\/span> (<\/span>const<\/span> std::<\/span>runtime_error&<\/span> e)<\/span> {<\/span>
\n std::<\/span>printf<\/span>(<\/span>"\u6355\u83b7\u4efb\u52a1\u5f02\u5e38: %s\\\\n"<\/span>,<\/span> e.<\/span>what<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
\n }<\/span>
\n}<\/span><\/p>\n

1..10 \u7684\u5e73\u65b9\u548c = 385, \u671f\u671b = 385
\n\u6355\u83b7\u4efb\u52a1\u5f02\u5e38: \u4efb\u52a1\u5185\u90e8\u51fa\u9519<\/p>\n

\u6ce8\u610f\u6700\u540e\u90a3\u6bb5：\u7ebf\u7a0b\u6c60\u4e0d\u9700\u8981\u81ea\u5df1\u5199\u5f02\u5e38\u5904\u7406\u6846\u67b6，\u56e0\u4e3a packaged_task \u5df2\u7ecf\u628a\u300c\u5f02\u5e38\u5b58\u8fdb\u5171\u4eab\u72b6\u6001\u300d\u505a\u6389\u4e86（\u673a\u5236\u89c1\u300astd::async\u3001future\u3001promise：\u5f02\u6b65\u4efb\u52a1\u7684\u8fd4\u56de\u503c\u3001\u5f02\u5e38\u4e0e\u4e09\u4e2a\u7ecf\u5178\u5751\u300b）\u3002\u5de5\u4f5c\u7ebf\u7a0b\u53ea\u7ba1 task()，\u5f02\u5e38\u4e0d\u4f1a\u6f0f\u5230\u7ebf\u7a0b\u5916\u9762\u53bb\u89e6\u53d1 std::terminate\u3002<\/p>\n

\u5b98\u65b9\u6587\u6863：std::packaged_task \u2014 cppreference \u00b7 std::invoke_result \u2014 cppreference<\/p>\n

5. \u8bbe\u8ba1\u70b9 \u2461\u2462：\u505c\u6b62\u6807\u5fd7\u4e0e\u300c\u7f6e\u6807\u5fd7 \u2192 notify \u2192 join\u300d\u7684\u987a\u5e8f<\/h3>\n

\u505c\u6b62\u6807\u5fd7\u53ea\u6709\u4e24\u4e2a\u8981\u6c42：\u8bfb\u5b83\u548c\u5199\u5b83\u4e0d\u80fd\u6570\u636e\u7ade\u4e89\u3002\u4e24\u79cd\u5408\u6cd5\u505a\u6cd5：<\/p>\n\n\u505a\u6cd5\u505c\u6b62\u6807\u5fd7\u8bfb\u5199\u65f6\u7684\u9501\u8bc4\u4ef7<\/tr>\n\n\n\n
\u53d7\u9501\u4fdd\u62a4（\u8fd9\u91cc\u7528\u6cd5）<\/td>\nbool stopping_<\/td>\n\u5fc5\u987b\u6301 mutex_<\/td>\n\u961f\u5217\u64cd\u4f5c\u672c\u6765\u5c31\u8981\u6301\u9501，\u987a\u624b\u5c31\u4fdd\u62a4\u4e86，\u4e0d\u5f15\u5165\u989d\u5916\u539f\u5b50\u64cd\u4f5c<\/td>\n<\/tr>\n
\u72ec\u7acb\u539f\u5b50\u91cf<\/td>\nstd::atomic<bool><\/td>\n\u8bfb\u7528 acquire\u3001\u5199\u7528 release<\/td>\n\u9002\u5408\u300c\u505c\u6b62\u6807\u5fd7\u8981\u5728\u4e0d\u6301\u9501\u7684\u8def\u5f84\u4e0a\u9891\u7e41\u8bfb\u300d\u7684\u573a\u666f；\u8fd9\u91cc\u7528\u4e0d\u4e0a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5173\u952e\u5728\u6790\u6784\u7684\u987a\u5e8f，\u4e09\u6b65\u4e00\u6b65\u90fd\u4e0d\u80fd\u6362：<\/p>\n

~ThreadPool() \u7684\u6b63\u786e\u987a\u5e8f\u4e0e\u6bcf\u4e00\u6b65\u7684\u5fc5\u8981\u6027<\/p>\n

\u2460 { lock_guard lk(mutex_); stopping_ = true; } \u2190 \u7f6e\u6807\u5fd7\u5fc5\u987b\u5728\u9501\u5185
\n \u2502 \u56e0\u4e3a wait \u7684\u8c13\u8bcd\u8981\u8bfb\u5b83，\u5fc5\u987b\u548c\u961f\u5217\u72b6\u6001\u770b\u5230\u540c\u4e00\u4e2a\u300c\u5feb\u7167\u300d
\n \u2502
\n \u2461 cv_.notify_all(); \u2190 \u53eb\u9192\u6240\u6709\u4eba
\n \u2502 \u53ea\u7f6e\u6807\u5fd7\u4e0d\u901a\u77e5 \u2192 \u7ebf\u7a0b\u8fd8\u7761\u5728 wait \u4e0a，join \u4f1a\u6c38\u8fdc\u5361\u4f4f
\n \u2502 （\u9760\u865a\u5047\u5524\u9192"\u78b0\u5de7"\u9192\u6765\u7684\u90a3\u79cd\u4ee3\u7801\u4e0d\u80fd\u8981）
\n \u2502
\n \u2462 for (worker : workers_) worker.join(); \u2190 \u7b49\u6240\u6709\u4eba\u9000\u51fa
\n join \u5fc5\u987b\u5728 notify \u4e4b\u540e \u2192 \u7ebf\u7a0b\u4f1a\u5148\u5728\u5faa\u73af\u91cc\u628a\u961f\u5217\u6392\u7a7a\u518d\u9000\u51fa
\n \u53cd\u8fc7\u6765\u5148 join \u518d\u7f6e\u6807\u5fd7 \u2192 \u6b7b\u9501：\u7ebf\u7a0b\u7b49\u961f\u5217，join \u7b49\u7ebf\u7a0b<\/p>\n

\u4e09\u79cd\u5178\u578b\u5199\u9519\u7684\u540e\u679c：<\/p>\n\n\u9519\u8bef\u5199\u6cd5\u73b0\u8c61<\/tr>\n\n\n\n\n\n
\u5148 join \u518d\u7f6e stopping_<\/td>\n\u6b7b\u9501：\u5de5\u4f5c\u7ebf\u7a0b\u6c38\u8fdc\u7b49\u4e0d\u5230\u505c\u6b62\u6807\u5fd7，join \u6c38\u4e0d\u8fd4\u56de<\/td>\n<\/tr>\n
\u7f6e\u4e86\u6807\u5fd7\u4f46\u4e0d notify_all<\/td>\n\u5361\u4f4f：\u7761\u7740\u7684\u7ebf\u7a0b\u6536\u4e0d\u5230\u901a\u77e5，join \u6302\u4f4f<\/td>\n<\/tr>\n
worker_loop \u91cc\u5199\u6210 if (stopping_) return;<\/td>\n\u4e22\u4efb\u52a1：\u961f\u5217\u91cc\u8fd8\u6ca1\u8dd1\u7684\u4efb\u52a1\u88ab\u76f4\u63a5\u9057\u5f03<\/td>\n<\/tr>\n
\u7528 notify_one \u4ee3\u66ff notify_all<\/td>\n\u4e0d\u786e\u5b9a：\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u9192\u4e86，\u5176\u4f59\u6c38\u8fdc\u7761\u7740，join \u6302\u4f4f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u987a\u5e26\u4e00\u53e5 C++20：\u6807\u51c6\u65b0\u589e\u4e86 std::jthread，\u5b83\u5728\u6790\u6784\u65f6\u81ea\u52a8\u300c\u8bf7\u6c42\u505c\u6b62 + join\u300d（\u8d70 std::stop_token），\u628a\u4e0a\u9762\u8fd9\u4e09\u6b65\u505a\u6210\u4e86\u8bed\u8a00\u7ea7\u4fdd\u8bc1 \u2014\u2014 \u9700\u8981 C++20，\u4e14\u5b83\u89e3\u51b3\u7684\u662f\u300c\u4e00\u4e2a\u7ebf\u7a0b\u300d，\u6c60\u7684\u505c\u6b62\u903b\u8f91\u8fd8\u662f\u5f97\u81ea\u5df1\u5199\u3002<\/p>\n

\u5b98\u65b9\u6587\u6863：std::jthread \u2014 cppreference（C++20，\u6790\u6784\u81ea\u52a8 join，\u5bf9\u6bd4\u770b\u66f4\u6e05\u695a RAII \u8be5\u505a\u4ec0\u4e48）<\/p>\n

6. \u8bbe\u8ba1\u70b9 \u2463：\u4efb\u52a1\u5fc5\u987b\u5728\u9501\u5916\u6267\u884c<\/h3>\n

worker_loop \u91cc task() \u90a3\u884c\u5982\u679c\u5728 lock \u7684\u4f5c\u7528\u57df\u5185\u8c03\u7528，\u4f1a\u51fa\u4e24\u4e2a\u95ee\u9898：<\/p>\n

  • \u4efb\u52a1\u91cc\u518d enqueue \u5c31\u6b7b\u9501：\u5b83\u8981\u62ff\u540c\u4e00\u628a mutex_，\u800c\u9501\u6b63\u88ab\u8fd9\u4e2a\u7ebf\u7a0b\u81ea\u5df1\u63e1\u7740，\u6807\u51c6\u5e93\u7684 std::mutex \u4e0d\u53ef\u91cd\u5165；<\/li>\n
  • \u5e76\u884c\u5ea6\u5f52\u96f6：\u6240\u6709\u5de5\u4f5c\u7ebf\u7a0b\u4e32\u5728\u300c\u6301\u9501\u6267\u884c\u4efb\u52a1\u300d\u4e0a，\u6c60\u9000\u5316\u6210\u5355\u7ebf\u7a0b，condition_variable \u767d\u642d\u3002<\/li>\n

    \u6240\u4ee5\u6807\u51c6\u59ff\u52bf\u662f\u53ea\u5728\u4e34\u754c\u533a\u91cc\u300c\u53d6\u4efb\u52a1\u300d，\u51fa\u4e86\u82b1\u62ec\u53f7\u518d\u6267\u884c：<\/p>\n

    \u4e34\u754c\u533a\u5c3d\u53ef\u80fd\u77ed：\u53ea\u5305\u4f4f\u300c\u961f\u5217\u72b6\u6001\u300d\u7684\u8bfb\u5199<\/p>\n

    \u250c\u2500\u2500 \u6301\u9501 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n \u2502 \u68c0\u67e5\u8c13\u8bcd（stopping_ \/ \u961f\u5217） \u2502
    \n \u2502 \u53d6\u8d70\u4e00\u4e2a\u4efb\u52a1 \u2502
    \n \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
    \n \u250c\u2500\u2500 \u4e0d\u6301\u9501 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n \u2502 task() \u2190 \u8017\u65f6\u5168\u5728\u8fd9\u91cc \u2502
    \n \u2502 \u4efb\u52a1\u91cc\u53ef\u4ee5\u518d enqueue \u2502
    \n \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

    \u5b98\u65b9\u6587\u6863：C++ Core Guidelines \u00b7 \u5e76\u53d1\u7ae0\u8282（CP.20 \u300c\u7528 RAII \u800c\u4e0d\u662f\u88f8 lock\/unlock\u300d\u3001CP.43 \u300c\u4e34\u754c\u533a\u5f00\u5f97\u8d8a\u5c0f\u8d8a\u597d\u300d）<\/p>\n

    7. \u5b8c\u6574\u793a\u4f8b：200 \u4e2a\u4efb\u52a1 + \u6790\u6784\u6392\u7a7a\u9a8c\u8bc1<\/h3>\n

    \u628a\u4e0a\u9762\u7684\u8bbe\u8ba1\u5408\u8d77\u6765，\u8dd1\u4e00\u4e2a\u5e26\u516c\u5f0f\u6838\u5bf9\u7684\u5b8c\u6574\u7a0b\u5e8f：<\/p>\n

    \/\/ pool_sum.cpp \u2014 \u7f16\u8bd1: g++ -std=c++17 -Wall -O2 -pthread pool_sum.cpp -o pool_sum<\/span>
    \n#<\/span>include<\/span> <atomic><\/span><\/span>
    \n#<\/span>include<\/span> <condition_variable><\/span><\/span>
    \n#<\/span>include<\/span> <cstdio><\/span><\/span>
    \n#<\/span>include<\/span> <functional><\/span><\/span>
    \n#<\/span>include<\/span> <future><\/span><\/span>
    \n#<\/span>include<\/span> <memory><\/span><\/span>
    \n#<\/span>include<\/span> <mutex><\/span><\/span>
    \n#<\/span>include<\/span> <queue><\/span><\/span>
    \n#<\/span>include<\/span> <stdexcept><\/span><\/span>
    \n#<\/span>include<\/span> <thread><\/span><\/span>
    \n#<\/span>include<\/span> <tuple><\/span><\/span>
    \n#<\/span>include<\/span> <type_traits><\/span><\/span>
    \n#<\/span>include<\/span> <utility><\/span><\/span>
    \n#<\/span>include<\/span> <vector><\/span><\/span><\/p>\n

    class<\/span> ThreadPool<\/span> {<\/span>
    \npublic<\/span>:<\/span>
    \n explicit<\/span> ThreadPool<\/span>(<\/span>std::<\/span>size_t workers)<\/span> {<\/span>
    \n workers_.<\/span>reserve<\/span>(<\/span>workers)<\/span>;<\/span>
    \n for<\/span> (<\/span>std::<\/span>size_t i =<\/span> 0<\/span>;<\/span> i <<\/span> workers;<\/span> ++<\/span>i)<\/span> {<\/span>
    \n workers_.<\/span>emplace_back<\/span>(<\/span>[<\/span>this<\/span>]<\/span> {<\/span> worker_loop<\/span>(<\/span>)<\/span>;<\/span> }<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    ~<\/span>ThreadPool<\/span>(<\/span>)<\/span> {<\/span> shutdown<\/span>(<\/span>)<\/span>;<\/span> }<\/span><\/p>\n

    ThreadPool<\/span>(<\/span>const<\/span> ThreadPool&<\/span>)<\/span> =<\/span> delete<\/span>;<\/span>
    \n ThreadPool&<\/span> operator<\/span>=<\/span>(<\/span>const<\/span> ThreadPool&<\/span>)<\/span> =<\/span> delete<\/span>;<\/span><\/p>\n

    template<\/span> <<\/span>typename<\/span> F<\/span>,<\/span> typename<\/span>.<\/span>.<\/span>.<\/span> Args><\/span>
    \n auto<\/span> enqueue<\/span>(<\/span>F&&<\/span> func,<\/span> Args&&<\/span>.<\/span>.<\/span>.<\/span> args)<\/span>
    \n -><\/span> std::<\/span>future<<\/span>std::<\/span>invoke_result_t<<\/span>F,<\/span> Args.<\/span>.<\/span>.<\/span>>><\/span> {<\/span>
    \n using<\/span> Result =<\/span> std::<\/span>invoke_result_t<<\/span>F,<\/span> Args.<\/span>.<\/span>.<\/span>><\/span>;<\/span><\/p>\n

    auto<\/span> bound =<\/span> std::<\/span>make_shared<\/span><<\/span>std::<\/span>packaged_task<<\/span>Result<\/span>(<\/span>)<\/span>>><\/span><\/span><\/span>(<\/span>
    \n [<\/span>func =<\/span> std::<\/span>forward<\/span><<\/span>F><\/span><\/span><\/span>(<\/span>func)<\/span>,<\/span>
    \n args =<\/span> std::<\/span>make_tuple<\/span>(<\/span>std::<\/span>forward<\/span><<\/span>Args><\/span><\/span><\/span>(<\/span>args)<\/span>.<\/span>.<\/span>.<\/span>)<\/span>]<\/span>(<\/span>)<\/span> mutable<\/span> -><\/span> Result {<\/span>
    \n return<\/span> std::<\/span>apply<\/span>(<\/span>func,<\/span> std::<\/span>move<\/span>(<\/span>args)<\/span>)<\/span>;<\/span>
    \n }<\/span>)<\/span>;<\/span><\/p>\n

    std::<\/span>future<<\/span>Result><\/span> result =<\/span> bound-><\/span>get_future<\/span>(<\/span>)<\/span>;<\/span>
    \n {<\/span>
    \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>mutex_)<\/span>;<\/span>
    \n tasks_.<\/span>emplace<\/span>(<\/span>[<\/span>bound]<\/span> {<\/span> (<\/span>*<\/span>bound)<\/span>(<\/span>)<\/span>;<\/span> }<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n cv_.<\/span>notify_one<\/span>(<\/span>)<\/span>;<\/span>
    \n return<\/span> result;<\/span>
    \n }<\/span><\/p>\n

    private<\/span>:<\/span>
    \n void<\/span> shutdown<\/span>(<\/span>)<\/span> {<\/span>
    \n {<\/span>
    \n std::<\/span>lock_guard<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>mutex_)<\/span>;<\/span>
    \n stopping_ =<\/span> true<\/span>;<\/span>
    \n }<\/span>
    \n cv_.<\/span>notify_all<\/span>(<\/span>)<\/span>;<\/span>
    \n for<\/span> (<\/span>auto<\/span>&<\/span> worker :<\/span> workers_)<\/span> {<\/span>
    \n if<\/span> (<\/span>worker.<\/span>joinable<\/span>(<\/span>)<\/span>)<\/span> worker.<\/span>join<\/span>(<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    void<\/span> worker_loop<\/span>(<\/span>)<\/span> {<\/span>
    \n for<\/span> (<\/span>;<\/span>;<\/span>)<\/span> {<\/span>
    \n std::<\/span>function<<\/span>void<\/span>(<\/span>)<\/span>><\/span> task;<\/span>
    \n {<\/span>
    \n std::<\/span>unique_lock<<\/span>std::<\/span>mutex><\/span> lock<\/span>(<\/span>mutex_)<\/span>;<\/span>
    \n cv_.<\/span>wait<\/span>(<\/span>lock,<\/span> [<\/span>this<\/span>]<\/span> {<\/span> return<\/span> stopping_ ||<\/span> !<\/span>tasks_.<\/span>empty<\/span>(<\/span>)<\/span>;<\/span> }<\/span>)<\/span>;<\/span>
    \n if<\/span> (<\/span>stopping_ &&<\/span> tasks_.<\/span>empty<\/span>(<\/span>)<\/span>)<\/span> return<\/span>;<\/span>
    \n task =<\/span> std::<\/span>move<\/span>(<\/span>tasks_.<\/span>front<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n tasks_.<\/span>pop<\/span>(<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n task<\/span>(<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span><\/p>\n

    std::<\/span>mutex mutex_;<\/span>
    \n std::<\/span>condition_variable cv_;<\/span>
    \n std::<\/span>queue<<\/span>std::<\/span>function<<\/span>void<\/span>(<\/span>)<\/span>>><\/span> tasks_;<\/span>
    \n std::<\/span>vector<<\/span>std::<\/span>thread><\/span> workers_;<\/span>
    \n bool<\/span> stopping_{<\/span>false<\/span>}<\/span>;<\/span>
    \n}<\/span>;<\/span><\/p>\n

    int<\/span> main<\/span>(<\/span>)<\/span> {<\/span>
    \n constexpr<\/span> int<\/span> kTasks =<\/span> 200<\/span>;<\/span>
    \n constexpr<\/span> long<\/span> long<\/span> kExpected =<\/span> 2686700LL<\/span>;<\/span> \/\/ 1\u00b2+2\u00b2+\u2026+200\u00b2 = 200\u00b7201\u00b7401\/6<\/span>
    \n std::<\/span>atomic<<\/span>int<\/span>><\/span> executed{<\/span>0<\/span>}<\/span>;<\/span><\/p>\n

    ThreadPool pool<\/span>(<\/span>4<\/span>)<\/span>;<\/span><\/p>\n

    std::<\/span>vector<<\/span>std::<\/span>future<<\/span>long<\/span> long<\/span>>><\/span> futures;<\/span>
    \n futures.<\/span>reserve<\/span>(<\/span>kTasks)<\/span>;<\/span>
    \n for<\/span> (<\/span>int<\/span> i =<\/span> 1<\/span>;<\/span> i <=<\/span> kTasks;<\/span> ++<\/span>i)<\/span> {<\/span>
    \n futures.<\/span>push_back<\/span>(<\/span>pool.<\/span>enqueue<\/span>(<\/span>[<\/span>&<\/span>executed]<\/span>(<\/span>int<\/span> x)<\/span> {<\/span>
    \n executed.<\/span>fetch_add<\/span>(<\/span>1<\/span>,<\/span> std::<\/span>memory_order_relaxed)<\/span>;<\/span>
    \n return<\/span> static_cast<\/span><<\/span>long<\/span> long<\/span>><\/span><\/span><\/span>(<\/span>x)<\/span> *<\/span> x;<\/span>
    \n }<\/span>,<\/span> i)<\/span>)<\/span>;<\/span>
    \n }<\/span><\/p>\n

    long<\/span> long<\/span> total =<\/span> 0<\/span>;<\/span>
    \n for<\/span> (<\/span>auto<\/span>&<\/span> fut :<\/span> futures)<\/span> total +=<\/span> fut.<\/span>get<\/span>(<\/span>)<\/span>;<\/span> \/\/ \u4e3b\u7ebf\u7a0b\u7b49\u6240\u6709\u7ed3\u679c，\u987a\u5e8f\u65e0\u5173<\/span><\/p>\n

    std::<\/span>printf<\/span>(<\/span>"\u4efb\u52a1\u6570 = %d, \u5b9e\u9645\u6267\u884c = %d\\\\n"<\/span>,<\/span> kTasks,<\/span> executed.<\/span>load<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n std::<\/span>printf<\/span>(<\/span>"\u5e73\u65b9\u548c = %lld, \u4e0e\u516c\u5f0f\u4e00\u81f4 = %d\\\\n"<\/span>,<\/span>
    \n total,<\/span> static_cast<\/span><<\/span>int<\/span>><\/span><\/span><\/span>(<\/span>total ==<\/span> kExpected)<\/span>)<\/span>;<\/span><\/p>\n

    {<\/span> \/\/ \u6790\u6784\u6392\u7a7a\u9a8c\u8bc1：\u6c60\u9500\u6bc1\u65f6\u961f\u5217\u91cc\u5269\u7684\u4efb\u52a1\u5fc5\u987b\u8dd1\u5b8c，\u4e00\u4e2a\u90fd\u4e0d\u80fd\u4e22<\/span>
    \n std::<\/span>atomic<<\/span>int<\/span>><\/span> drained{<\/span>0<\/span>}<\/span>;<\/span>
    \n {<\/span>
    \n ThreadPool inner<\/span>(<\/span>2<\/span>)<\/span>;<\/span>
    \n for<\/span> (<\/span>int<\/span> i =<\/span> 0<\/span>;<\/span> i <<\/span> 50<\/span>;<\/span> ++<\/span>i)<\/span> {<\/span>
    \n inner.<\/span>enqueue<\/span>(<\/span>[<\/span>&<\/span>drained]<\/span> {<\/span> drained.<\/span>fetch_add<\/span>(<\/span>1<\/span>,<\/span> std::<\/span>memory_order_relaxed)<\/span>;<\/span> }<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n }<\/span> \/\/ inner \u6790\u6784 \u2192 \u6392\u7a7a \u2192 \u7ebf\u7a0b\u9000\u51fa<\/span>
    \n std::<\/span>printf<\/span>(<\/span>"\u6790\u6784\u524d\u63d0\u4ea4 50 \u4e2a, \u6790\u6784\u540e\u5b8c\u6210 = %d\\\\n"<\/span>,<\/span> drained.<\/span>load<\/span>(<\/span>)<\/span>)<\/span>;<\/span>
    \n }<\/span>
    \n}<\/span><\/p>\n

    \u4efb\u52a1\u6570 = 200, \u5b9e\u9645\u6267\u884c = 200
    \n\u5e73\u65b9\u548c = 2686700, \u4e0e\u516c\u5f0f\u4e00\u81f4 = 1
    \n\u6790\u6784\u524d\u63d0\u4ea4 50 \u4e2a, \u6790\u6784\u540e\u5b8c\u6210 = 50<\/p>\n

    \u4e09\u4e2a\u6570\u5b57\u5168\u90e8\u4e0e\u8c03\u5ea6\u987a\u5e8f\u65e0\u5173：\u4efb\u52a1\u4e00\u4e2a\u4e0d\u591a\u4e00\u4e2a\u4e0d\u5c11（200 = 200\u300150 = 50，\u8bc1\u660e\u6790\u6784\u786e\u5b9e\u6392\u7a7a\u4e86\u961f\u5217），\u5e73\u65b9\u548c\u7b49\u4e8e\u516c\u5f0f\u503c（\u8bc1\u660e\u6bcf\u4e2a\u4efb\u52a1\u7684\u53c2\u6570\u90fd\u6b63\u786e\u9001\u5230\u4e86\u6267\u884c\u65b9）\u3002\u8fd9\u91cc\u523b\u610f\u53ea\u6253\u5370\u300c\u8ba1\u6570\u3001\u603b\u548c\u3001\u5e03\u5c14\u6838\u5bf9\u300d\u8fd9\u7c7b\u987a\u5e8f\u65e0\u5173\u7684\u7ed3\u679c\u3002\u5de5\u4f5c\u7ebf\u7a0b\u8c01\u5148\u8c01\u540e\u3001\u54ea\u4e2a\u7ebf\u7a0b\u8dd1\u4e86\u51e0\u4e2a\u4efb\u52a1，\u90fd\u4e0d\u5f71\u54cd\u8fd9\u4e09\u884c\u3002<\/p>\n

    8. \u5ef6\u4f38\u9605\u8bfb<\/h3>\n
      \n
    • std::thread \u2014 cppreference \u2014\u2014 \u7ebf\u7a0b\u521b\u5efa\/\u9500\u6bc1\u7684\u6210\u672c\u4e0e join\/detach \u7684\u8bed\u4e49，\u7406\u89e3\u300c\u7ebf\u7a0b\u6c60\u7701\u7684\u662f\u4ec0\u4e48\u300d<\/li>\n
    • std::condition_variable \u2014 cppreference \u2014\u2014 wait(lock, pred) \u4e3a\u4ec0\u4e48\u5fc5\u987b\u662f\u8c13\u8bcd\u7248，\u662f worker_loop \u5199\u6cd5\u6b63\u786e\u6027\u7684\u4f9d\u636e<\/li>\n
    • std::packaged_task \u2014 cppreference \u2014\u2014 \u300c\u8fd4\u56de\u503c + \u5f02\u5e38\u300d\u901a\u9053\u7684\u5173\u952e\u96f6\u4ef6，\u6ce8\u610f\u5b83\u53ea\u53ef\u79fb\u52a8<\/li>\n
    • std::future \u2014 cppreference \u2014\u2014 \u8c03\u7528\u65b9\u62ff\u5230\u7684\u53e5\u67c4，get() \u4e00\u6b21\u6027\u6d88\u8d39<\/li>\n
    • std::invoke_result \u2014 cppreference \u2014\u2014 enqueue \u8fd4\u56de\u503c\u7c7b\u578b\u63a8\u5bfc\u7684\u51fa\u5904<\/li>\n
    • std::jthread \u2014 cppreference \u2014\u2014 C++20 \u7684\u300c\u6790\u6784\u81ea\u52a8 join\u300d，\u5bf9\u7167\u5b83\u7406\u89e3\u8fd9\u7bc7\u7684 shutdown() \u987a\u5e8f<\/li>\n
    • C++ Core Guidelines \u00b7 \u5e76\u53d1\u7ae0\u8282 \u2014\u2014 CP.20\/CP.43 \u7b49\u4e34\u754c\u533a\u4e0e\u9501\u7684\u89c4\u5219<\/li>\n<\/ul>\n

      \u672c\u77e5\u8bc6\u5e93\u5185\u7684\u76f8\u5173\u7bc7\u76ee：<\/p>\n

        \n
      • \u300astd::thread \u5165\u95e8：\u542f\u52a8\u3001join\u3001detach \u4e0e\u751f\u547d\u5468\u671f\u300b \u2014\u2014 std::thread \u6790\u6784\u524d\u5fc5\u987b join \u6216 detach<\/li>\n
      • \u300astd::async\u3001future\u3001promise：\u5f02\u6b65\u4efb\u52a1\u7684\u8fd4\u56de\u503c\u3001\u5f02\u5e38\u4e0e\u4e09\u4e2a\u7ecf\u5178\u5751\u300b \u2014\u2014 std::thread \u62ff\u4e0d\u5230\u8fd4\u56de\u503c\u3001\u4e5f\u4f20\u4e0d\u51fa\u5f02\u5e38<\/li>\n
      • \u300amutex \u4e0e lock_guard \/ unique_lock：\u5171\u4eab\u6570\u636e\u7684\u6b63\u786e\u52a0\u9501\u59ff\u52bf\u300b \u2014\u2014 \u591a\u4e2a\u7ebf\u7a0b\u6539\u540c\u4e00\u4e2a\u53d8\u91cf\u4f1a\u600e\u6837？\u8fd9\u7bc7\u5148\u8bb2\u6e05\u6570\u636e\u7ade\u4e89（\u8bfb-\u6539-\u5199\u88ab\u6253\u65ad）\u4e3a\u4ec0\u4e48\u8ba9\u7ed3\u679c\u968f\u673a<\/li>\n<\/ul>\n

        9. \u4e00\u53e5\u8bdd\u603b\u7ed3<\/h3>\n

        \u7ebf\u7a0b\u6c60 = \u4e00\u6b21\u521b\u5efa\u3001\u53cd\u590d\u590d\u7528：\u6784\u9020\u65f6\u8d77 N \u4e2a\u5de5\u4f5c\u7ebf\u7a0b，\u5404\u81ea\u5faa\u73af\u300c\u7b49\u4efb\u52a1 \u2192 \u6301\u9501\u53d6\u4efb\u52a1 \u2192 \u9501\u5916\u6267\u884c\u300d，\u4efb\u52a1\u961f\u5217\u7531 mutex \u4fdd\u62a4\u3001\u7531 condition_variable \u5524\u9192；enqueue \u7528\u53ef\u53d8\u53c2\u6570\u6a21\u677f + packaged_task + future \u628a\u8fd4\u56de\u503c\u548c\u5f02\u5e38\u9001\u56de\u8c03\u7528\u65b9；\u505c\u6b62\u65f6\u987a\u5e8f\u94c1\u5b9a\u662f\u300c\u6301\u9501\u7f6e\u6807\u5fd7 \u2192 notify_all \u2192 join\u300d，\u53cd\u4e86\u5c31\u662f\u6b7b\u9501\u6216\u4e22\u4efb\u52a1；\u6267\u884c\u4efb\u52a1\u4e00\u5b9a\u8981\u653e\u5728\u9501\u5916，\u5426\u5219\u4efb\u52a1\u91cc\u518d enqueue \u4f1a\u81ea\u9501\u3001\u5e76\u884c\u5ea6\u4e5f\u5f52\u96f6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

        \u6bcf\u4e2a\u4efb\u52a1 new \u4e00\u4e2a std::thread \u662f\u5e76\u53d1\u7f16\u7a0b\u91cc\u6700\u8d35\u7684\u5077\u61d2\u65b9\u5f0f：\u7ebf\u7a0b\u521b\u5efa\u8981\u8d70\u7cfb\u7edf\u8c03\u7528，\u6808\u7a7a\u95f4\u6309\u5146\u7b97，\u9500\u6bc1\u53c8\u8981\u518d\u6765\u4e00\u904d\u3002\u5f53\u4efb\u52a1\u672c\u8eab\u53ea\u6709\u51e0\u5fae\u79d2\u65f6，\u4f60\u82b1\u5728\u300c\u9020\u7ebf\u7a0b\u300d\u4e0a\u7684\u65f6\u95f4\u4f1a\u6bd4\u5e72\u6d3b\u591a\u51e0\u5341\u500d\u3002 \u7ebf\u7a0b\u6c60\u7684\u601d\u8def\u5f88\u6734\u7d20：\u7ebf\u7a0b\u53ea\u521b\u5efa\u4e00\u6b21，\u4efb\u52a1\u6392\u961f，\u8c01\u7a7a\u8c01\u53d6\u3002\u8fd9\u7bc7\u4ece\u96f6\u628a\u5b83\u5199\u51fa\u6765，\u7136\u540e\u628a\u4e09\u4e2a\u6700\u5bb9\u6613\u5199\u9519\u7684\u8bbe\u8ba1\u70b9\u8bb2\u900f\u3002
        \n1. \u5f15\u5b50：\u7b97\u4e00\u7b14\u7ebf\u7a0b\u7684\u8d26
        \n\/\/ \u7247\u6bb5&<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[12925,55,3169,56],"topic":[],"class_list":["post-113604","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-3169","tag-56"],"yoast_head":"\n\u624b\u5199\u4e00\u4e2a\u7ebf\u7a0b\u6c60\uff1a\u4efb\u52a1\u961f\u5217\u3001\u5de5\u4f5c\u7ebf\u7a0b\u4e0e\u505c\u6b62\u987a\u5e8f\u7684\u4e09\u4e2a\u8bbe\u8ba1\u70b9 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/113604.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u624b\u5199\u4e00\u4e2a\u7ebf\u7a0b\u6c60\uff1a\u4efb\u52a1\u961f\u5217\u3001\u5de5\u4f5c\u7ebf\u7a0b\u4e0e\u505c\u6b62\u987a\u5e8f\u7684\u4e09\u4e2a\u8bbe\u8ba1\u70b9 - 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