{"id":10020689,"date":"2025-03-28T13:55:47","date_gmt":"2025-03-28T05:55:47","guid":{"rendered":"https:\/\/itmax.cn\/?p=10020689"},"modified":"2025-03-28T13:55:47","modified_gmt":"2025-03-28T05:55:47","slug":"%e9%94%81%e4%b8%8e%e6%97%a0%e9%94%81%e7%9a%84%e5%8d%9a%e5%bc%88%ef%bc%9a%e5%b9%b6%e5%8f%91%e7%bc%96%e7%a8%8b%e4%b8%ad%e7%9a%84%e6%80%a7%e8%83%bd%e4%b8%8e%e5%a4%8d%e6%9d%82%e6%80%a7%e6%9d%83%e8%a1%a1","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10020689","title":{"rendered":"\u9501\u4e0e\u65e0\u9501\u7684\u535a\u5f08\uff1a\u5e76\u53d1\u7f16\u7a0b\u4e2d\u7684\u6027\u80fd\u4e0e\u590d\u6742\u6027\u6743\u8861"},"content":{"rendered":"

\u6458\u8981<\/h2>\n

\u5728\u5e76\u53d1\u7f16\u7a0b\u4e2d\uff0c\u9501\u673a\u5236\u548c\u65e0\u9501\u7f16\u7a0b\u662f\u4e24\u79cd\u5e38\u89c1\u7684\u540c\u6b65\u624b\u6bb5\u3002\u9501\u673a\u5236\u901a\u8fc7\u4e92\u65a5\u9501\u3001\u8bfb\u5199\u9501\u7b49\u65b9\u5f0f\u786e\u4fdd\u7ebf\u7a0b\u5b89\u5168\uff0c\u4f46\u5bb9\u6613\u5f15\u53d1\u6b7b\u9501\u548c\u6027\u80fd\u74f6\u9888\u3002\u65e0\u9501\u7f16\u7a0b\u5219\u901a\u8fc7CAS\uff08Compare-And-Swap\uff09\u7b49\u539f\u5b50\u64cd\u4f5c\u5b9e\u73b0\u9ad8\u6548\u5e76\u53d1\uff0c\u4f46\u5b9e\u73b0\u590d\u6742\u3002\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8\u9501\u673a\u5236\u7684\u7c7b\u578b\u53ca\u5176\u9002\u7528\u573a\u666f\uff0c\u5206\u6790\u65e0\u9501\u7f16\u7a0b\u7684\u539f\u7406\u53ca\u5176\u4f18\u7f3a\u70b9\uff0c\u5e76\u63d0\u4f9b\u4ee3\u7801\u793a\u4f8b\u548c\u6027\u80fd\u5bf9\u6bd4\u3002<\/p>\n

\u5f15\u8a00<\/h2>\n

\u968f\u7740\u591a\u6838\u5904\u7406\u5668\u7684\u666e\u53ca\uff0c\u5e76\u53d1\u7f16\u7a0b\u6210\u4e3a\u63d0\u5347\u5e94\u7528\u6027\u80fd\u7684\u91cd\u8981\u624b\u6bb5\u3002\u7136\u800c\uff0c\u5e76\u53d1\u7f16\u7a0b\u4e2d\u7684\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u4e00\u76f4\u662f\u5f00\u53d1\u8005\u9762\u4e34\u7684\u6311\u6218\u3002\u9501\u673a\u5236\u901a\u8fc7\u9650\u5236\u8d44\u6e90\u7684\u8bbf\u95ee\u6765\u786e\u4fdd\u7ebf\u7a0b\u5b89\u5168\uff0c\u4f46\u5bb9\u6613\u5f15\u53d1\u6b7b\u9501\u548c\u6027\u80fd\u74f6\u9888\u3002\u65e0\u9501\u7f16\u7a0b\u901a\u8fc7\u539f\u5b50\u64cd\u4f5c\u5b9e\u73b0\u9ad8\u6548\u5e76\u53d1\uff0c\u4f46\u5b9e\u73b0\u590d\u6742\u4e14\u5bb9\u6613\u51fa\u9519\u3002\u672c\u6587\u5c06\u6df1\u5165\u63a2\u8ba8\u8fd9\u4e24\u79cd\u540c\u6b65\u624b\u6bb5\uff0c\u5e76\u63d0\u4f9b\u4ee3\u7801\u793a\u4f8b\u548c\u6027\u80fd\u5bf9\u6bd4\u3002<\/p>\n

\u9501\u673a\u5236<\/h2>\n

\u4e92\u65a5\u9501\uff08Mutex\uff09<\/h3>\n

\u4e92\u65a5\u9501\u662f\u6700\u5e38\u89c1\u7684\u9501\u673a\u5236\uff0c\u7528\u4e8e\u4fdd\u62a4\u5171\u4eab\u8d44\u6e90\uff0c\u786e\u4fdd\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u4ee5\u8bbf\u95ee\u8be5\u8d44\u6e90\u3002<\/p>\n

\u9002\u7528\u573a\u666f<\/strong>\uff1a\u9002\u7528\u4e8e\u5bf9\u5171\u4eab\u8d44\u6e90\u7684\u72ec\u5360\u8bbf\u95ee\uff0c\u5982\u8ba1\u6570\u5668\u3001\u961f\u5217\u7b49\u3002<\/p>\n

\u4ee3\u7801\u793a\u4f8b<\/strong>\uff1a<\/p>\n

import threading\n\ncounter = 0\nlock = threading.Lock()\n\ndef increment():\n    global counter\n    for _ in range(100000):\n        lock.acquire()\n        counter += 1\n        lock.release()\n\nthreads = []\nfor i in range(10):\n    thread = threading.Thread(target=increment)\n    threads.append(thread)\n    thread.start()\n\nfor thread in threads:\n    thread.join()\n\nprint(f"Final counter value: {counter}")<\/code><\/pre>\n
\u8bfb\u5199\u9501\uff08ReadWrite Lock\uff09<\/h3>\n
\u8bfb\u5199\u9501\u5141\u8bb8\u591a\u4e2a\u8bfb\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\uff0c\u4f46\u5199\u7ebf\u7a0b\u72ec\u5360\u8bbf\u95ee\u3002<\/p>\n
\u9002\u7528\u573a\u666f<\/strong>\uff1a\u9002\u7528\u4e8e\u8bfb\u591a\u5199\u5c11\u7684\u573a\u666f\uff0c\u5982\u7f13\u5b58\u3001\u914d\u7f6e\u6587\u4ef6\u7b49\u3002<\/p>\n
\u4ee3\u7801\u793a\u4f8b<\/strong>\uff1a<\/p>\n
import threading\n\ndata = {}\nrw_lock = threading.RLock()\n\ndef read_data(key):\n    rw_lock.acquire()\n    try:\n        return data.get(key, None)\n    finally:\n        rw_lock.release()\n\ndef write_data(key, value):\n    rw_lock.acquire()\n    try:\n        data[key] = value\n    finally:\n        rw_lock.release()\n\n# Example usage\nwrite_data("foo", "bar")\nprint(read_data("foo"))<\/code><\/pre>\n
\u65e0\u9501\u7f16\u7a0b<\/h2>\n
CAS\uff08Compare-And-Swap\uff09<\/h3>\n
CAS\u662f\u4e00\u79cd\u539f\u5b50\u64cd\u4f5c\uff0c\u7528\u4e8e\u5b9e\u73b0\u65e0\u9501\u7f16\u7a0b\u3002\u5b83\u6bd4\u8f83\u5185\u5b58\u4e2d\u7684\u503c\u4e0e\u9884\u671f\u503c\uff0c\u5982\u679c\u76f8\u7b49\u5219\u66f4\u65b0\u4e3a\u65b0\u503c\u3002<\/p>\n
\u9002\u7528\u573a\u666f<\/strong>\uff1a\u9002\u7528\u4e8e\u9ad8\u5e76\u53d1\u573a\u666f\uff0c\u5982\u65e0\u9501\u961f\u5217\u3001\u65e0\u9501\u6808\u7b49\u3002<\/p>\n
\u4ee3\u7801\u793a\u4f8b<\/strong>\uff1a<\/p>\n
import threading\nimport ctypes\n\ndef cas(ptr, old, new):\n    return ctypes.c_int.from_address(ptr).value == old and \/\n           ctypes.c_int.from_address(ptr).value == new\n\ncounter = 0\ncounter_ptr = id(counter)\n\ndef increment():\n    global counter\n    for _ in range(100000):\n        while True:\n            old = counter\n            new = old + 1\n            if cas(counter_ptr, old, new):\n                break\n\nthreads = []\nfor i in range(10):\n    thread = threading.Thread(target=increment)\n    threads.append(thread)\n    thread.start()\n\nfor thread in threads:\n    thread.join()\n\nprint(f"Final counter value: {counter}")<\/code><\/pre>\n
\u6027\u80fd\u5bf9\u6bd4<\/h2>\n
\u6d4b\u8bd5\u73af\u5883<\/strong>\uff1a<\/p>\n