{"id":9257,"date":"2024-04-23T01:07:34","date_gmt":"2024-04-22T17:07:34","guid":{"rendered":"\/?p=9257"},"modified":"2024-04-23T01:07:34","modified_gmt":"2024-04-22T17:07:34","slug":"semaphore%e5%92%8cboundedsemaphore","status":"publish","type":"post","link":"\/?p=9257","title":{"rendered":"Semaphore\u548cBoundedSemaphore"},"content":{"rendered":"

\u6982\u8ff0<\/h2>\n

\u5728Python\u7684asyncio<\/code>\u6a21\u5757\u4e2d\uff0cSemaphore<\/code>\uff08\u4fe1\u53f7\u91cf\uff09\u548cBoundedSemaphore<\/code>\uff08\u6709\u754c\u4fe1\u53f7\u91cf\uff09\u90fd\u7528\u4e8e\u63a7\u5236\u5728\u5f02\u6b65\u7f16\u7a0b\u4e2d\u5bf9\u5171\u4eab\u8d44\u6e90\u7684\u8bbf\u95ee\u3002\u5b83\u4eec\u901a\u8fc7\u9650\u5236\u540c\u65f6\u53ef\u4ee5\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u7684\u534f\u7a0b\u6570\u91cf\u6765\u7ba1\u7406\u5e76\u53d1\u3002<\/p>\n

    \n
  1. \n

    Semaphore\uff08\u4fe1\u53f7\u91cf\uff09<\/strong>\uff1a<\/p>\n

      \n
    • Semaphore<\/code>\u662fasyncio<\/code>\u4e2d\u7684\u4e00\u4e2a\u8ba1\u6570\u5668\uff0c\u7528\u4e8e\u8ddf\u8e2a\u5141\u8bb8\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u7684\u4efb\u52a1\u6570\u91cf\u3002\u5f53\u8ba1\u6570\u5668\u4e3a\u6b63\u65f6\uff0c\u5141\u8bb8\u8bbf\u95ee\u8d44\u6e90\uff1b\u5f53\u8ba1\u6570\u5668\u4e3a\u96f6\u65f6\uff0c\u8d44\u6e90\u88ab\u9501\u5b9a\uff0c\u5176\u4ed6\u4efb\u52a1\u9700\u8981\u7b49\u5f85\u91ca\u653e\u8d44\u6e90\u540e\u624d\u80fd\u8bbf\u95ee\u3002Semaphore\u7684\u8ba1\u6570\u5668\u5728\u521d\u59cb\u5316\u65f6\u88ab\u8bbe\u7f6e\u4e3a\u4e00\u4e2a\u975e\u8d1f\u6574\u6570\u3002\u5f53\u8ba1\u6570\u5668\u4e3a1\u65f6\uff0cSemaphore\u884c\u4e3a\u7c7b\u4f3c\u4e8eLock\uff08\u9501\uff09\uff0c\u5373\u53ea\u5141\u8bb8\u4e00\u4e2a\u4efb\u52a1\u8bbf\u95ee\u8d44\u6e90\uff1b\u5f53\u8ba1\u6570\u5668\u5927\u4e8e1\u65f6\uff0c\u5141\u8bb8\u591a\u4e2a\u4efb\u52a1\u540c\u65f6\u8bbf\u95ee\u8d44\u6e90\u3002<\/li>\n<\/ul>\n<\/li>\n
    • \n

      BoundedSemaphore\uff08\u6709\u754c\u4fe1\u53f7\u91cf\uff09<\/strong>\uff1a<\/p>\n

        \n
      • BoundedSemaphore<\/code>\u662fasyncio<\/code>\u4e2d\u7684\u4e00\u79cd\u7279\u6b8a\u7c7b\u578b\u7684Semaphore\uff0c\u5b83\u6709\u4e00\u4e2a\u4e0a\u9650\u503c\u3002\u4e0e\u666e\u901a\u7684Semaphore\u4e0d\u540c\uff0cBoundedSemaphore\u7684\u8ba1\u6570\u5668\u5728\u521d\u59cb\u5316\u65f6\u88ab\u8bbe\u7f6e\u4e3a\u4e00\u4e2a\u975e\u8d1f\u6574\u6570\uff0c\u5e76\u4e14\u8fd8\u6709\u4e00\u4e2a\u4e0a\u9650\u503c\u3002\u5f53\u8ba1\u6570\u5668\u8fbe\u5230\u4e0a\u9650\u503c\u65f6\uff0c\u4efb\u4f55\u5c1d\u8bd5\u589e\u52a0\u8ba1\u6570\u5668\u7684\u64cd\u4f5c\u90fd\u4f1a\u88ab\u963b\u585e\uff0c\u76f4\u5230\u6709\u5176\u4ed6\u4efb\u52a1\u91ca\u653e\u4e86\u8d44\u6e90\u5e76\u5c06\u8ba1\u6570\u5668\u964d\u4f4e\u3002
        \n\u5728Python\u7684asyncio\u5e93\u4e2d\uff0cSemaphore\u548cBoundedSemaphore\u662f\u7528\u4e8e\u63a7\u5236\u5f02\u6b65\u4efb\u52a1\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u6216\u6267\u884c\u5173\u952e\u90e8\u5206\u7684\u540c\u6b65\u539f\u8bed\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

        Semaphore<\/h2>\n

        Semaphore\u662f\u4e00\u4e2a\u901a\u7528\u7684\u4fe1\u53f7\u91cf\uff0c\u5b83\u53ef\u4ee5\u6709\u4e00\u4e2a\u975e\u8d1f\u6574\u6570\u503c\uff0c\u8868\u793a\u53ef\u7528\u7684\u201c\u8bb8\u53ef\u201d\u6570\u91cf\u3002\u6bcf\u6b21\u4e00\u4e2a\u5f02\u6b65\u4efb\u52a1\u9700\u8981\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u65f6\uff0c\u5b83\u4f1a\u5c1d\u8bd5\u83b7\u53d6\u4e00\u4e2a\u8bb8\u53ef\uff1b\u5982\u679c\u8bb8\u53ef\u53ef\u7528\uff0c\u4efb\u52a1\u4f1a\u7ee7\u7eed\u6267\u884c\uff1b\u5982\u679c\u6ca1\u6709\u8bb8\u53ef\u53ef\u7528\uff0c\u4efb\u52a1\u4f1a\u7b49\u5f85\uff0c\u76f4\u5230\u6709\u8bb8\u53ef\u53ef\u7528\u3002<\/p>\n

        \u4f60\u53ef\u4ee5\u4f7f\u7528Semaphore\u6765\u9650\u5236\u5e76\u53d1\u6267\u884c\u7684\u4efb\u52a1\u6570\u91cf\uff0c\u5373\u4f7f\u8d44\u6e90\u662f\u65e0\u9650\u7684\u3002<\/p>\n

        \u793a\u4f8b\uff1a<\/p>\n

        from asyncio import Semaphore, create_task, run  \n\nsem = Semaphore(3)  # \u6700\u591a\u5141\u8bb83\u4e2a\u4efb\u52a1\u540c\u65f6\u6267\u884c  \n\nasync def worker():  \n    async with sem:  \n        # \u6267\u884c\u67d0\u4e9b\u64cd\u4f5c  \n        print(f"Worker is running, current semaphore value: {sem._value}")  \n\nasync def main():  \n    tasks = [create_task(worker()) for _ in range(10)]  \n    await asyncio.gather(*tasks)  \n\nrun(main())<\/code><\/pre>\n
        BoundedSemaphore<\/h2>\n
        BoundedSemaphore\u662fSemaphore\u7684\u4e00\u4e2a\u7279\u6b8a\u7248\u672c\uff0c\u5b83\u6709\u4e00\u4e2a\u56fa\u5b9a\u7684\u6700\u5927\u503c\uff0c\u8868\u793a\u8bb8\u53ef\u7684\u603b\u6570\u3002\u5c1d\u8bd5\u521b\u5efa\u4e00\u4e2a\u8d85\u8fc7\u5176\u6700\u5927\u503c\u7684BoundedSemaphore\u4f1a\u5f15\u53d1ValueError\u3002<\/p>\n
        \u4f7f\u7528BoundedSemaphore\u53ef\u4ee5\u786e\u4fdd\u4f60\u4e0d\u4f1a\u610f\u5916\u5730\u521b\u5efa\u8fc7\u591a\u7684\u8bb8\u53ef\uff0c\u8fd9\u5728\u67d0\u4e9b\u573a\u666f\u4e2d\u53ef\u80fd\u662f\u6709\u7528\u7684\uff0c\u4f8b\u5982\uff0c\u5f53\u4f60\u6709\u4e00\u4e2a\u56fa\u5b9a\u6570\u91cf\u7684\u7269\u7406\u8d44\u6e90\uff08\u5982\u6570\u636e\u5e93\u8fde\u63a5\uff09\u5e76\u4e14\u4e0d\u60f3\u8d85\u51fa\u8fd9\u4e2a\u6570\u91cf\u65f6\u3002<\/p>\n
        \u793a\u4f8b\uff1a<\/p>\n
        from asyncio import BoundedSemaphore, create_task, run  \n\nsem = BoundedSemaphore(3)  # \u6700\u591a\u5141\u8bb83\u4e2a\u8bb8\u53ef  \n\nasync def worker():  \n    async with sem:  \n        # \u6267\u884c\u67d0\u4e9b\u64cd\u4f5c  \n        print(f"Worker is running, current semaphore value: {sem._value}")  \n\nasync def main():  \n    tasks = [create_task(worker()) for _ in range(10)]  \n    await asyncio.gather(*tasks)  \n\nrun(main())<\/code><\/pre>\n
        \u5728\u8fd9\u4e24\u4e2a\u793a\u4f8b\u4e2d\uff0c\u5c3d\u7ba1\u6211\u4eec\u521b\u5efa\u4e8610\u4e2a\u4efb\u52a1\uff0c\u4f46\u7531\u4e8eSemaphore\u6216BoundedSemaphore\u7684\u9650\u5236\uff0c\u6700\u591a\u53ea\u67093\u4e2a\u4efb\u52a1\u53ef\u4ee5\u540c\u65f6\u6267\u884c\u3002\u5176\u4ed6\u4efb\u52a1\u4f1a\u7b49\u5f85\uff0c\u76f4\u5230\u6709\u4efb\u52a1\u5b8c\u6210\u5e76\u91ca\u653e\u8bb8\u53ef\u3002<\/p>\n
        \u6ce8\u610f\uff1a\u5728\u5b9e\u9645\u4ee3\u7801\u4e2d\uff0c\u901a\u5e38\u4e0d\u5efa\u8bae\u76f4\u63a5\u8bbf\u95ee_value\u5c5e\u6027\u6765\u68c0\u67e5\u4fe1\u53f7\u91cf\u7684\u503c\uff0c\u56e0\u4e3a\u8fd9\u662f\u4e00\u4e2a\u5185\u90e8\u5b9e\u73b0\u7ec6\u8282\uff0c\u5e76\u53ef\u80fd\u5728\u672a\u6765\u7684\u7248\u672c\u4e2d\u53d1\u751f\u53d8\u5316\u3002\u8fd9\u91cc\u53ea\u662f\u4e3a\u4e86\u89e3\u91ca\u76ee\u7684\u800c\u4f7f\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
        \u6982\u8ff0 \u5728Python\u7684asyncio\u6a21\u5757\u4e2d\uff0cSemaphore\uff08\u4fe1\u53f7\u91cf\uff09\u548cBoundedSemaphore\uff08\u6709\u754c\u4fe1\u53f7\u91cf\uff09\u90fd\u7528\u4e8e\u63a7\u5236\u5728\u5f02\u6b65   \u2026 …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[268],"tags":[266],"_links":{"self":[{"href":"\/index.php?rest_route=\/wp\/v2\/posts\/9257"}],"collection":[{"href":"\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=9257"}],"version-history":[{"count":1,"href":"\/index.php?rest_route=\/wp\/v2\/posts\/9257\/revisions"}],"predecessor-version":[{"id":9258,"href":"\/index.php?rest_route=\/wp\/v2\/posts\/9257\/revisions\/9258"}],"wp:attachment":[{"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9257"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9257"},{"taxonomy":"post_tag","embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9257"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}