{"id":78289,"date":"2026-02-26T20:17:36","date_gmt":"2026-02-26T12:17:36","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/78289.html"},"modified":"2026-02-26T20:17:36","modified_gmt":"2026-02-26T12:17:36","slug":"linux%ef%bc%9a%e7%ba%bf%e7%a8%8b%e9%97%b4%e9%80%9a%e4%bf%a1","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/78289.html","title":{"rendered":"Linux\uff1a\u7ebf\u7a0b\u95f4\u901a\u4fe1"},"content":{"rendered":"

\u76ee\u5f55<\/p>\n

1.\u91cd\u8981\u6982\u5ff5<\/p>\n

2.\u7ebf\u7a0b\u95f4\u901a\u4fe1\u5b9e\u73b0\u65b9\u5f0f\u2014\u2014\u6700\u7b80\u5355\u7684\u65b9\u6cd5:\u5168\u5c40\u53d8\u91cf+\u9501（\u4e92\u65a5\u9501）<\/p>\n

3.\u539f\u5b50\u64cd\u4f5c<\/p>\n

4.\u4e92\u65a5\u9501（Mutex）<\/p>\n

4.1\u4e92\u65a5\u9501\u76f8\u5173\u6982\u5ff5<\/p>\n

4.2\u4e92\u65a5\u9501\u76f8\u5173\u51fd\u6570（pthread \u5e93）<\/p>\n

4.3\u4e92\u65a5\u9501\u4f7f\u7528\u6b65\u9aa4<\/p>\n

4.3.1\u5b9a\u4e49\u4e92\u65a5\u9501<\/p>\n

4.3.2\u521d\u59cb\u5316\u4e92\u65a5\u9501<\/p>\n

4.3.3\u52a0\u9501（\u8fdb\u5165\u4e34\u754c\u533a）<\/p>\n

4.3.4\u89e3\u9501（\u79bb\u5f00\u4e34\u754c\u533a）<\/p>\n

4.3.4\u9500\u6bc1\u4e92\u65a5\u9501<\/p>\n

4.3.4\u9500\u6bc1\u4e92\u5b9e\u6218\u6848\u4f8b<\/p>\n

5.\u9501\u5728\u4f7f\u7528\u65f6\u6bd4\u8f83\u5e38\u89c1\u7684\u95ee\u9898\u2014\u2014\u6b7b\u9501<\/p>\n

6.\u4fe1\u53f7\u91cf(Semaphore)<\/p>\n

6.1\u4fe1\u53f7\u91cf\u76f8\u5173\u6982\u5ff5<\/p>\n

6.2\u4fe1\u53f7\u91cf\u7684\u539f\u7406<\/p>\n

6.3\u4fe1\u53f7\u91cf\u76f8\u5173\u51fd\u6570（semaphore.h\u5e93）<\/p>\n

6.4\u4fe1\u53f7\u91cf\u7684\u4f7f\u7528\u6b65\u9aa4<\/p>\n

6.4.1\u5b9a\u4e49\u4fe1\u53f7\u91cf<\/p>\n

6.4.2\u00a0\u521d\u59cb\u5316\u4fe1\u53f7\u91cf<\/p>\n

6.4.3\u4fe1\u53f7\u91cf\u7684\u64cd\u4f5c\u2014\u2014\u7533\u8bf7\u8d44\u6e90<\/p>\n

6.4.4\u4fe1\u53f7\u91cf\u7684\u64cd\u4f5c\u2014\u2014\u91ca\u653e\u8d44\u6e90<\/p>\n

6.4.5\u9500\u6bc1\u4fe1\u53f7\u91cf<\/p>\n

6.4.6\u4fe1\u53f7\u91cf\u540c\u6b65\u5b9e\u6218\u793a\u4f8b<\/p>\n

\n

1.\u91cd\u8981\u6982\u5ff5<\/h2>\n

\u2460\u4e34\u754c\u8d44\u6e90\u200b：\u4e00\u6b21\u4ec5\u5141\u8bb8\u4e00\u4e2a\u4efb\u52a1（\u7ebf\u7a0b\/\u8fdb\u7a0b）\u8bbf\u95ee\u7684\u5171\u4eab\u8d44\u6e90（\u6bd4\u5982\u5168\u5c40\u53d8\u91cf\u3001\u6587\u4ef6\u3001\u786c\u4ef6\u8bbe\u5907）\u3002\u662f\u9700\u8981\u88ab\u4fdd\u62a4\u7684\u5bf9\u8c61<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u4f8b：\u552f\u4e00\u7684\u5751\u4f4d \/ \u5171\u4eab\u7684\u94f6\u884c\u8d26\u6237\u200b\/\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u4e2d\u7684\u5171\u4eab\u53d8\u91cf\u3001\u5171\u4eab\u6587\u4ef6\u3001\u5171\u4eab\u6570\u636e\u5e93\u8fde\u63a5\u3001\u5171\u4eab\u786c\u4ef6（\u5982\u6253\u5370\u673a）\u3002<\/p>\n<\/p>\n

\u2461\u4e34\u754c\u533a（\u5373\u4e34\u754c\u4ee3\u7801）：\u8bbf\u95ee\u548c\u64cd\u4f5c\u4e34\u754c\u8d44\u6e90\u7684\u90a3\u6bb5\u4ee3\u7801\u3002\u200b\u3010\u4e34\u754c\u4ee3\u7801\u6216\u4e34\u754c\u533a\u4e0d\u53ef\u80fd\u540c\u65f6\u88abCPU\u4efb\u52a1\u6267\u884c\u3011<\/p>\n<\/p>\n

\u2462\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898：\u200b\u5f53\u591a\u4e2a\u7ebf\u7a0b\u672a\u53d7\u63a7\u5236\u5730\u5e76\u53d1\u8bbf\u95ee\u540c\u4e00\u4e34\u754c\u8d44\u6e90\u65f6，\u5bfc\u81f4\u7a0b\u5e8f\u7ed3\u679c\u4e0d\u53ef\u9884\u6d4b\u3001\u6570\u636e\u635f\u574f\u6216\u903b\u8f91\u9519\u8bef\u7684\u95ee\u9898\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u6bd4\u55bb：\u4e89\u62a2\u5f15\u53d1\u7684\u6df7\u4e71 \/ \u8d26\u6237\u91d1\u989d\u51fa\u9519\u200b<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u539f\u56e0：\u7ebf\u7a0b\u7684\u6267\u884c\u987a\u5e8f\u548c\u65f6\u673a\u7531\u64cd\u4f5c\u7cfb\u7edf\u8c03\u5ea6，\u5145\u6ee1\u4e0d\u786e\u5b9a\u6027\u3002<\/p>\n<\/p>\n

2.\u7ebf\u7a0b\u95f4\u901a\u4fe1\u5b9e\u73b0\u65b9\u5f0f\u2014\u2014\u6700\u7b80\u5355\u7684\u65b9\u6cd5:\u5168\u5c40\u53d8\u91cf+\u9501（\u4e92\u65a5\u9501）<\/span><\/h2>\n

1.\u4e00\u4e2a\u8fdb\u7a0b\u7a7a\u95f4\u5185\u90e8\u7684\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u6570\u636e\u6bb5\u548c\u5806\u533a，\u6240\u4ee5\u5168\u5c40\u53d8\u91cf\u3001\u9759\u6001\u53d8\u91cf\u3001\u5806\u533a\u7a7a\u95f4\u90fd\u662f\u5171\u4eab\u7684，\u53ef\u4ee5\u5229\u7528\u8fd9\u4e9b\u7a7a\u95f4\u901a\u4fe1 2.\u591a\u7ebf\u7a0b\u64cd\u4f5c\u5168\u5c40\u53d8\u91cf\u7a7a\u95f4\u65f6\u4f1a\u5f15\u5165\u8d44\u6e90\u7ade\u4e89<\/p>\n

3.\u591a\u7ebf\u7a0b\u8981\u907f\u514d\u5f15\u5165\u8d44\u6e90\u7ade\u4e89\u53ef\u4ee5\u901a\u8fc7\u52a0\u4e92\u65a5\u9501\u89e3\u51b3\u3010\u5e94\u7528\u5c42\u7f16\u7a0b\u7528\u4e92\u65a5\u9501，\u5185\u6838\u7f16\u7a0b\u7528\u5185\u65cb\u9501\u3011<\/p>\n

4.\u4e92\u65a5\u7684\u6838\u5fc3\u662f\u6392\u4ed6\u6027\u8bbf\u95ee：\u540c\u4e00\u65f6\u523b，\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u80fd\u64cd\u4f5c\u4e34\u754c\u8d44\u6e90\u3002<\/p>\n

3.\u539f\u5b50\u64cd\u4f5c<\/h2>\n

\u6982\u5ff5：\u4e0d\u4f1a\u88abCPU\u4efb\u52a1\u8c03\u5ea6\u6253\u65ad\u7684\u4e00\u6b21\u6700\u5c0f\u7684\u64cd\u4f5c\u79f0\u4e3a\u539f\u5b50\u64cd\u4f5c（\u5373\u4e00\u6b21\u673a\u5668\u7801）<\/p>\n

4.\u4e92\u65a5\u9501（Mutex）<\/h2>\n

4.1\u4e92\u65a5\u9501\u76f8\u5173\u6982\u5ff5<\/h3>\n

1.\u4e92\u65a5\u6982\u5ff5：\u4e92\u65a5\u7684\u6838\u5fc3\u662f\u6392\u4ed6\u6027\u8bbf\u95ee，\u4e3a\u907f\u514d\u591a\u7ebf\u7a0b\u8d44\u6e90\u7ade\u4e89，\u540c\u4e00\u5b8f\u89c2\u65f6\u523b，\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u80fd\u64cd\u4f5c\u4e34\u754c\u8d44\u6e90\u3002（\u4e92\u65a5\u9501，\u5219"\u8fd9\u628a\u9501\u53ea\u80fd\u4e00\u4e2a\u4eba\u7528"<\/span>）<\/p>\n

2.\u4e92\u65a5\u9501\u4f7f\u7528\u65b9\u6cd5：\u914d\u5408\u8d44\u6e90\u4f7f\u7528，\u4f7f\u7528\u8d44\u6e90\u524d\u52a0\u9501，\u4f7f\u7528\u8d44\u6e90\u7ed3\u675f\u540e\u89e3\u9501<\/p>\n

3.\u52a0\u9501\u540e，\u65e0\u6cd5\u518d\u6b21\u52a0\u9501，\u5fc5\u987b\u963b\u585e\u7b49\u5f85\u89e3\u9501\u540e\u624d\u80fd\u7ee7\u7eed\u52a0\u9501<\/p>\n

4.2\u4e92\u65a5\u9501\u76f8\u5173\u51fd\u6570（pthread \u5e93）<\/h3>\n

\u76f8\u5173\u51fd\u6570\u3010\u51fd\u6570：\u5c31\u56db\u4e2a\u3011\u3010\u5e94\u7528：\u5c31\u4e00\u4e2a\u2014\u2014\u907f\u514d\u8d44\u6e90\u7ade\u4e89\u95ee\u9898\u3011<\/p>\n

\u4e92\u65a5\u9501\u7684\u521d\u59cb\u5316\u00a0 ：pthread_mutex_init<\/p>\n

\u4e92\u65a5\u9501\u7684\u9500\u6bc1\u00a0 \u00a0 \u00a0：pthread_mutex_destroy<\/p>\n

\u4e92\u65a5\u9501\u7684\u52a0\u9501\u00a0 \u00a0 \u00a0：pthread_mutex_lock<\/p>\n

\u4e92\u65a5\u9501\u7684\u89e3\u9501\u00a0 \u00a0 \u00a0：pthread_mutex_unlock<\/p>\n

pthread_mutex_init<\/p>\n

\u539f\u578b：int pthread_mutex_init(pthread_mutex_t *restrict mutex,const pthread_mutexattr_t*restrict attr); \u529f\u80fd:<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4e92\u65a5\u9501\u7684\u521d\u59cb\u5316 \u53c2\u6570: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mutex:\u4e92\u65a5\u9501\u7a7a\u95f4\u9996\u5730\u5740 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0attr:\u4e92\u65a5\u9501\u7684\u5c5e\u6027，\u9ed8\u8ba4\u4f20NULL<\/p>\n

\u8fd4\u56de\u503c: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6210\u529f\u8fd4\u56de0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5931\u8d25\u8fd4\u56de\u975e0<\/p>\n

pthread_mutex_destroy<\/p>\n

\u539f\u578b：int pthread_mutex_destroy(pthread_mutex_t *mutex); \u529f\u80fd:<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4e92\u65a5\u9501\u7684\u9500\u6bc1 \u53c2\u6570: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mutex:\u4e92\u65a5\u9501\u7a7a\u95f4\u9996\u5730\u5740<\/p>\n

\u8fd4\u56de\u503c: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6210\u529f\u8fd4\u56de0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5931\u8d25\u8fd4\u56de\u975e0<\/p>\n

pthread mutex_ lock<\/p>\n

\u539f\u578b：int pthread_mutex_lock(pthread_mutex_t *mutex); \u529f\u80fd:<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4e92\u65a5\u9501\u52a0\u9501<\/p>\n

    \n
  • \u7528\u6307\u5b9a\u7684\u4e92\u65a5\u9501\u5f00\u59cb\u52a0\u9501\u4ee3\u7801，\u6210\u529f\u5219\u8fdb\u5165\u4e34\u754c\u533a；\u5931\u8d25\u5219\u963b\u585e\u7b49\u5f85\u3002<\/li>\n
  • \u6ce8\u610f：\u52a0\u9501\u540e\u7684\u4ee3\u7801\u662f\u539f\u5b50\u64cd\u4f5c（\u7ebf\u7a0b\u8c03\u5ea6\u4e0d\u4f1a\u6253\u65ad\u8fd9\u6bb5\u4ee3\u7801）\u3002<\/li>\n<\/ul>\n

    \u53c2\u6570: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mutex:\u4e92\u65a5\u9501\u7a7a\u95f4\u9996\u5730\u5740<\/p>\n

    \u8fd4\u56de\u503c: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6210\u529f\u8fd4\u56de0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5931\u8d25\u8fd4\u56de\u975e0<\/p>\n

    pthread mutex_unlock<\/p>\n

    \u539f\u578b：int pthread_mutex_lock(pthread_mutex_t *mutex); \u529f\u80fd:<\/p>\n

    \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4e92\u65a5\u9501\u89e3\u9501<\/p>\n

      \n
    • \u5c06\u6307\u5b9a\u7684\u4e92\u65a5\u9501\u89e3\u9501，\u8ba9\u5176\u4ed6\u7ebf\u7a0b\u53ef\u4ee5\u7ade\u4e89\u3002\u89e3\u9501\u4e4b\u540e\u4ee3\u7801\u4e0d\u518d\u6392\u4ed6\u8bbf\u95ee\u3002<\/li>\n
    • \u6ce8\u610f：\u52a0\u9501\u548c\u89e3\u9501\u5fc5\u987b\u6210\u5bf9\u51fa\u73b0，\u4e14\u8981\u5728\u540c\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u6267\u884c\u3002<\/li>\n<\/ul>\n

      \u53c2\u6570: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0mutex:\u4e92\u65a5\u9501\u7a7a\u95f4\u9996\u5730\u5740<\/p>\n

      \u8fd4\u56de\u503c: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6210\u529f\u8fd4\u56de0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5931\u8d25\u8fd4\u56de\u975e0<\/p>\n

      4.3\u4e92\u65a5\u9501\u4f7f\u7528\u6b65\u9aa4<\/h3>\n

      Linux\u00a0\u4e0b\u7528 pthread_mutex_t \u5b9e\u73b0\u4e92\u65a5\u9501，\u6b65\u9aa4\u662f：\u5b9a\u4e49\u2192\u521d\u59cb\u5316\u2192\u52a0\u9501\u2192\u89e3\u9501\u2192\u9500\u6bc1\u3002<\/p>\n

      4.3.1\u5b9a\u4e49\u4e92\u65a5\u9501<\/h4>\n

      #include <pthread.h>
      \n\/\/ \u5b9a\u4e49\u5168\u5c40\/\u5171\u4eab\u7684\u4e92\u65a5\u9501
      \npthread_mutex_t lock; <\/p>\n

      4.3.2\u521d\u59cb\u5316\u4e92\u65a5\u9501<\/h4>\n

      \/\/ \u793a\u4f8b
      \npthread_mutex_init(&lock, NULL); <\/p>\n

      4.3.3\u52a0\u9501（\u8fdb\u5165\u4e34\u754c\u533a）<\/h4>\n

      \/\/ \u793a\u4f8b
      \npthread_mutex_lock(&lock); <\/p>\n

      4.3.4\u89e3\u9501（\u79bb\u5f00\u4e34\u754c\u533a）<\/h4>\n

      \/\/ \u793a\u4f8b
      \npthread_mutex_unlock(&lock); <\/p>\n

      4.3.4\u9500\u6bc1\u4e92\u65a5\u9501<\/h4>\n

      \/\/ \u793a\u4f8b
      \npthread_mutex_destroy(&lock); <\/p>\n

      4.3.4\u9500\u6bc1\u4e92\u5b9e\u6218\u6848\u4f8b<\/h4>\n

      #include <stdio.h>
      \n#include <stdlib.h> \/\/ \u7528\u4e8e\u7ed9\u6307\u9488\u7f6e\u7a7a
      \n#include <string.h>
      \n#include <pthread.h> \/\/\u7528\u4e8e\u7ebf\u7a0b\u76f8\u5173\u51fd\u6570<\/p>\n

      int Num = 0;
      \npthread_mutex_t lock;<\/p>\n

      void* threadfun1(void* arg)
      \n{
      \n printf("\u7ebf\u7a0b\u5f00\u59cb\u6267\u884c（TID：%#x）\\\\n",(unsigned int)pthread_self());\/\/%#x:\u5341\u516d\u8fdb\u5236\u6570，\u5c0f\u5199\u5b57\u6bcd，\u5e76\u81ea\u52a8\u6dfb\u52a0 0x\u524d\u7f00\u3002<\/p>\n

      while(1) \/\/\u6b7b\u5faa\u73af\u662f\u4e3a\u4e86\u9632\u6b62\u8fdb\u7a0b\u7ed3\u675f，\u56e0\u4e3a\u8fdb\u7a0b\u4e0d\u5728\u7ebf\u7a0b\u4e5f\u4e0d\u5728
      \n {
      \n pthread_mutex_lock(&lock);
      \n Num = 100;
      \n printf("Num = %d\\\\n",Num);
      \n pthread_mutex_unlock(&lock);
      \n }
      \n return NULL;
      \n}<\/p>\n

      void* threadfun2(void* arg)
      \n{
      \n printf("\u7ebf\u7a0b\u5f00\u59cb\u6267\u884c（TID：%#x）\\\\n",(unsigned int)pthread_self());\/\/%#x:\u5341\u516d\u8fdb\u5236\u6570，\u5c0f\u5199\u5b57\u6bcd，\u5e76\u81ea\u52a8\u6dfb\u52a0 0x\u524d\u7f00\u3002<\/p>\n

      while(1) \/\/\u6b7b\u5faa\u73af\u662f\u4e3a\u4e86\u9632\u6b62\u8fdb\u7a0b\u7ed3\u675f，\u56e0\u4e3a\u8fdb\u7a0b\u4e0d\u5728\u7ebf\u7a0b\u4e5f\u4e0d\u5728
      \n {
      \n pthread_mutex_lock(&lock);
      \n Num = 200;
      \n printf("Num = %d\\\\n",Num);
      \n pthread_mutex_unlock(&lock);
      \n }
      \n return NULL;
      \n}<\/p>\n

      int main(void)
      \n{
      \n int ret1 = 0;
      \n int ret2 = 0; <\/p>\n

      pthread_t tid1;
      \n pthread_t tid2;<\/p>\n

      pthread_mutex_init(&lock,NULL); \/\/\u4e0d\u914d\u7f6e，\u6240\u4ee5\u7f6e\u7a7a
      \n ret1 =pthread_create(&tid1,NULL,threadfun1,NULL);\/\/\u521b\u5efa\u7ebf\u7a0b1
      \n ret2 =pthread_create(&tid2,NULL,threadfun2,NULL);
      \n#if 1
      \n if(ret1 != 0 || ret2 != 0)
      \n {
      \n perror("fail to pthread_create");
      \n return -1;
      \n }
      \n#endif
      \n pthread_join(tid1,NULL);\/\/\u963b\u585e\u56de\u6536\u7ebf\u7a0b
      \n pthread_join(tid2,NULL);<\/p>\n

      pthread_mutex_destroy(&lock);\/\/\u9501\u7684\u9500\u6bc1<\/p>\n

      return 0;
      \n} <\/p>\n

      \u6ce8\u610f：<\/p>\n

      \u2460\u8981\u52a0\u9501\u5c31\u5fc5\u987b\u5404\u8fdb\u7a0b\u90fd\u52a0\u9501\u624d\u80fd\u5b9e\u73b0\u4f60\u60f3\u8981\u7684\u529f\u80fd（\u5426\u5219\u4f60\u633a\u5b88\u89c4\u77e9\u4e0a\u5395\u6240\u4e0a\u9501，\u4f46\u662f\u522b\u4eba\u4e0d\u5b88\u89c4\u77e9\u4e00\u811a\u628a\u95e8\u8e39\u5f00）<\/p>\n

      \u2461\u4e92\u65a5\u9501\u53ea\u80fd\u89e3\u51b3\u8d44\u6e90\u7ade\u4e89，\u4f46\u662f\u8c01\u5148\u7528\u8c01\u540e\u7528\u4e0d\u77e5\u9053（\u4e92\u65a5\u9501\u4e0d\u7b49\u4e8e\u540c\u6b65）<\/p>\n

      \u2462\u7b2c\u4e8c\u4e2a\u4eba\u53ea\u6709\u5f53\u7b2c\u4e00\u4e2a\u4eba\u89e3\u5b8c\u9501，\u4e14\u4efb\u52a1\u8c03\u5ea6\u521a\u597d\u5230\u8fbe\u7b2c\u4e8c\u4e2a\u4eba\u65f6，\u7b2c\u4e8c\u4e2a\u4eba\u624d\u80fd\u62ff\u5230\u9501<\/p>\n

      5.\u9501\u5728\u4f7f\u7528\u65f6\u6bd4\u8f83\u5e38\u89c1\u7684\u95ee\u9898\u2014\u2014\u6b7b\u9501<\/h2>\n

      \u6b7b\u9501\u7684\u7ecf\u5178\u793a\u4f8b（\u54f2\u5b66\u5bb6\u5c31\u9910\u95ee\u9898）<\/p>\n

      \/\/ 5\u4e2a\u54f2\u5b66\u5bb6，5\u652f\u7b77\u5b50（5\u628a\u9501）
      \n\/\/ \u6bcf\u4e2a\u54f2\u5b66\u5bb6\u9700\u8981\u540c\u65f6\u62ff\u8d77\u5de6\u53f3\u4e24\u652f\u7b77\u5b50\u624d\u80fd\u5403\u996d<\/p>\n

      \u54f2\u5b66\u5bb6A：\u62ff\u8d77\u5de6\u7b77\u5b50 \u2192 \u7b49\u5f85\u53f3\u7b77\u5b50（\u88abB\u62ff\u7740）
      \n\u54f2\u5b66\u5bb6B：\u62ff\u8d77\u5de6\u7b77\u5b50 \u2192 \u7b49\u5f85\u53f3\u7b77\u5b50（\u88abC\u62ff\u7740）
      \n\u54f2\u5b66\u5bb6C：\u62ff\u8d77\u5de6\u7b77\u5b50 \u2192 \u7b49\u5f85\u53f3\u7b77\u5b50（\u88abD\u62ff\u7740）
      \n\u54f2\u5b66\u5bb6D：\u62ff\u8d77\u5de6\u7b77\u5b50 \u2192 \u7b49\u5f85\u53f3\u7b77\u5b50（\u88abE\u62ff\u7740）
      \n\u54f2\u5b66\u5bb6E：\u62ff\u8d77\u5de6\u7b77\u5b50 \u2192 \u7b49\u5f85\u53f3\u7b77\u5b50（\u88abA\u62ff\u7740）\u2190 \u5f62\u6210\u5faa\u73af\u7b49\u5f85！ <\/p>\n

      \u6982\u5ff5：\u6b7b\u9501\u662f\u4e24\u4e2a\u6216\u66f4\u591a \u8fdb\u7a0b\/\u7ebf\u7a0b \u5728\u6267\u884c\u8fc7\u7a0b\u4e2d，\u56e0\u7ade\u4e89\u5171\u4eab\u8d44\u6e90\u800c\u9020\u6210\u7684\u4e00\u79cd\u76f8\u4e92\u7b49\u5f85\u7684\u72b6\u6001\u3002\u82e5\u65e0\u5916\u529b\u5e72\u6d89，\u5b83\u4eec\u90fd\u5c06\u65e0\u6cd5\u7ee7\u7eed\u5411\u524d\u63a8\u8fdb\u3002<\/p>\n

      \u539f\u56e0：\u591a\u4efb\u52a1\u901a\u4fe1\u8fc7\u7a0b\u4e2d\u7531\u4e8e\u52a0\u9501\u5bfc\u81f4<\/p>\n<\/p>\n

      \u6b7b\u9501\u4ea7\u751f\u7684\u56db\u4e2a\u5145\u5206\u6761\u4ef6：<\/p>\n

      \u00a0 \u00a0 \u00a0 \u00a0 \u2460\u4e92\u65a5\u6761\u4ef6（\u8d44\u6e90\u4e00\u6b21\u53ea\u80fd\u4e00\u4e2a\u4eba\u7528，\u6211\u52a0\u95011\u4f60\u5c31\u4e0d\u80fd\u52a0\u95011\u4e86，\u4e00\u4e2a\u9501\u53ea\u80fd\u88ab\u4e00\u4e2a\u4eba\u5360\u7528）<\/p>\n

      \u00a0 \u00a0 \u00a0 \u00a0 \u2461\u4e0d\u53ef\u5265\u593a\u6761\u4ef6（\u8fdb\u7a0b\/\u7ebf\u7a0b\u5df2\u83b7\u5f97\u7684\u8d44\u6e90，\u5728\u672a\u4f7f\u7528\u5b8c\u4e4b\u524d\u4e0d\u80fd\u88ab\u5f3a\u5236\u5265\u593a\u3002\u4e0d\u80fd\u62a2\u522b\u4eba\u6b63\u5728\u7528\u7684\u8d44\u6e90）<\/p>\n

      \u00a0 \u00a0 \u00a0 \u00a0 \u2462\u8bf7\u6c42\u4fdd\u6301（\u62ff\u4e0d\u5230\u9501，\u963b\u585e\u7b49\u5f85，\u8fc7\u4e00\u6bb5\u65f6\u95f4\u7ee7\u7eed\u8bf7\u6c42\u62ff\u9501）<\/p>\n

      \u00a0 \u00a0 \u00a0 \u00a0 \u2463\u5faa\u73af\u7b49\u5f85（\u82e5\u5e72\u8fdb\u7a0b\u4e4b\u95f4\u5f62\u6210\u4e00\u79cd\u5934\u5c3e\u76f8\u63a5\u7684\u5faa\u73af\u7b49\u5f85\u94fe\u8d44\u6e90\u5173\u7cfb\u3002）<\/p>\n<\/p>\n

      \u89e3\u51b3\u6b7b\u9501（\u7834\u574f\u5145\u5206\u6761\u4ef6\u5373\u53ef，\u2460\u2461\u662f\u9501\u7684\u57fa\u672c\u7279\u6027，\u65e0\u6cd5\u7834\u574f，\u53ea\u80fd\u7834\u574f\u2462\u6216\u2463）：<\/p>\n

      \u00a0 \u00a0 \u00a0 \u00a0 \u2460\u7528pthread_mutex_trylock\u907f\u514d\u6c38\u4e45\u963b\u585e\u66ff\u4ee3pthread_mutex_lock\u3010\u4f5c\u7528：\u5c1d\u8bd5\u52a0\u9501，\u80fd\u52a0\u5c31\u52a0，\u52a0\u4e0d\u4e0a\u5c31\u4e0d\u52a0，\u8df3\u8fc7\u52a0\u9501\u8fd9\u91cc，\u800c\u53bb\u6267\u884c\u540e\u8fb9\u7a0b\u5e8f，\u9632\u6b62\u4e86\u7a0b\u5e8f\u5361\u6b7b\u3011\u3010\u539f\u7406：\u7834\u574f\u201c\u8bf7\u6c42\u4fdd\u6301\u201d\u6761\u4ef6\u3011<\/p>\n

      \/\/ \u4f7f\u7528pthread_mutex_trylock\u907f\u514d\u6c38\u4e45\u963b\u585e
      \nif (pthread_mutex_trylock(&lock) == 0) {
      \n \/\/ \u6210\u529f\u83b7\u5f97\u9501
      \n \/\/ … \u6267\u884c\u64cd\u4f5c
      \n pthread_mutex_unlock(&lock);
      \n} else {
      \n \/\/ \u83b7\u53d6\u5931\u8d25，\u6267\u884c\u66ff\u4ee3\u903b\u8f91\u6216\u7a0d\u540e\u91cd\u8bd5
      \n \/\/ \u4e0d\u4f1a\u963b\u585e\u5728\u8fd9\u91cc
      \n} <\/p>\n

      \u00a0 \u00a0 \u00a0 \u00a0 \u2461\u6240\u6709\u7ebf\u7a0b\u52a0\u9501\u987a\u5e8f\u4fdd\u6301\u4e00\u81f4\u3010\u6700\u5b9e\u7528，\u80fd\u5f7b\u5e95\u9884\u9632\u6b7b\u9501，\u9884\u9632\u4f18\u4e8e\u68c0\u6d4b\u3011<\/span>（\u7ebf\u7a0b1\u662f\u5148\u52a0\u95011，\u518d\u52a0\u95012，\u90a3\u4e48\u7ebf\u7a0b2\u4e5f\u8981\u52a0\u95011，\u518d\u52a0\u95012\u3002\u5426\u5219\u5bfc\u81f4\u6b7b\u9501）<\/p>\n

      \u8f6f\u4ef6\u7f16\u7801\u4e2d，<\/span>\u963b\u585e\u4e00\u5b9a\u8981\u907f\u514d（\u4f7f\u7528\u5e26\u5ef6\u65f6\u6216\u5e26\u5c1d\u8bd5try\u7684\u51fd\u6570\u63a5\u53e3）<\/span>，\u56e0\u4e3a\u975e\u5e38\u5bb9\u6613\u5bfc\u81f4\u5361\u6b7b\u3002\u6216\u8005\u52a0\u4e0a\u8d85\u65f6\u9000\u51fa<\/span><\/p>\n<\/p>\n

      <\/h3>\n

      6.\u4fe1\u53f7\u91cf(Semaphore)<\/h2>\n

      6.1\u4fe1\u53f7\u91cf\u76f8\u5173\u6982\u5ff5<\/h3>\n

      \u4fe1\u53f7\u91cf\u7684\u6982\u5ff5：\u4fe1\u53f7\u91cf\u662f\u4e00\u4e2a\u8d44\u6e90，\u8d44\u6e90\u53ef\u4ee5\u521d\u59cb\u5316\u3001\u9500\u6bc1\u3001\u7533\u8bf7\u548c\u91ca\u653e<\/p>\n

      \u5982\u679c\u8d44\u6e90\u6570>0，\u5219\u7533\u8bf7\u8d44\u6e90\u662f\u8ba9\u8d44\u6e90\u6570-1<\/p>\n

      \u5982\u679c\u8d44\u6e90\u6570\u4e3a0，\u7533\u8bf7\u8d44\u6e90\u65f6\u5219\u4f1a\u963b\u585e\u7b49\u5f85，\u7b49\u5f85\u6709\u4eba\u91ca\u653e\u8d44\u6e90，\u624d\u80fd\u7533\u8bf7\u62ff\u5230\u8d44\u6e90<\/p>\n

      \u91ca\u653e\u4e0d\u4f1a\u963b\u5be8，\u8ba9\u8d44\u6e90\u6570+1<\/p>\n

      \u540c\u6b65\u4e0e\u5f02\u6b65<\/p>\n

      1.\u540c\u6b65:\u62e5\u6709\u4e25\u683c\u7684\u5148\u540e\u6267\u884c\u7684\u903b\u8f91\u987a\u5e8f\u5173\u9645 2.\u5f02\u6b65:\u4ee3\u7801\u6267\u884c\u6d41\u7a0b\u6ca1\u6709\u4efb\u4f55\u5173\u8054\u6027<\/p>\n

      \u4fe1\u53f7\u91cf\u5e94\u7528：\u2460\u4fe1\u53f7\u91cf\u53ef\u4ee5\u5b9e\u73b0\u591a\u7ebf\u7a0b\u95f4\u7684\u540c\u6b65（\u4fe1\u53f7\u91cf\u662f\u5b9e\u73b0\u540c\u6b65\u7684\u5de5\u5177），\u8ba9\u591a\u4e2a\u4efb\u52a1\u5177\u6709\u5148\u540e\u987a\u5e8f\u5173\u7cfb（\u4e0d\u4ec5\u53ef\u4ee5\u9632\u6b62\u8d44\u6e90\u7ade\u4e89，\u8fd8\u80fd\u8ba9\u591a\u4efb\u52a1\u6709\u4e25\u683c\u987a\u5e8f，\u6bd4\u4e92\u65a5\u9501\u66f4\u5f3a\u5927）<\/span>\u2461\u5b9e\u73b0\u591a\u529f\u80fd\u7684\u62c6\u5206，\u907f\u514d\u529f\u80fd\u95f4\u8026\u5408，\u4e00\u4e2a\u7ebf\u7a0b\u5b8c\u6210\u4e00\u4e2a\u6982\u5ff5<\/p>\n

      \u540c\u6b65\u4e0e\u4e92\u65a5\u7684\u5173\u7cfb:<\/p>\n

      \u540c\u6b65\u662f\u4e92\u65a5\u7684 \u201c\u7279\u4f8b\u201d：\u540c\u6b65\u4e0d\u4ec5\u8981\u6392\u4ed6\u8bbf\u95ee，\u8fd8\u8981\u63a7\u5236\u6267\u884c\u987a\u5e8f\u3002<\/p>\n

      \"\"<\/p>\n

      \u4e92\u65a5\u9501\u4e0e\u4fe1\u53f7\u91cf\u7684\u533a\u522b<\/p>\n

        \n
      • \u4e92\u65a5\u9501：\u52a0\u9501\u548c\u89e3\u9501\u662f\u540c\u4e00\u4e2a\u7ebf\u7a0b，\u4e34\u754c\u533a\u4ee3\u7801\u77ed\u5c0f\u7cbe\u608d，\u907f\u514d\u4f11\u7720\u3001\u5927\u8017\u65f6\u7684\u64cd\u4f5c<\/li>\n
      • \u4fe1\u53f7\u91cf：th1 \u91ca\u653e th2，th2 \u91ca\u653e th1\u3002\u7531\u7ebf\u7a0b\u4ea4\u53c9\u91ca\u653e\u3002\u53ef\u4ee5\u6709\u9002\u5f53\u4f11\u7720\u3001\u5c0f\u7684\u8017\u65f6\u64cd\u4f5c<\/li>\n<\/ul>\n

        6.2\u4fe1\u53f7\u91cf\u7684\u539f\u7406<\/h3>\n

        \u4fe1\u53f7\u91cf\u662f\u4e00\u4e2a\u6574\u6570 sem，\u901a\u8fc7 \u7533\u8bf7\u8d44\u6e90 \u548c \u91ca\u653e\u8d44\u6e90 \u5b9e\u73b0\u540c\u6b65：<\/p>\n

          \n
        • \u7533\u8bf7\u8d44\u6e90：sem–，\u82e5 sem<0 \u5219\u7ebf\u7a0b\u963b\u585e；<\/li>\n
        • \u91ca\u653e\u8d44\u6e90：sem++，\u82e5 sem<=0 \u5219\u5524\u9192\u4e00\u4e2a\u963b\u585e\u7684\u7ebf\u7a0b\u3002<\/li>\n<\/ul>\n

          6.3\u4fe1\u53f7\u91cf\u76f8\u5173\u51fd\u6570（semaphore.h\u5e93）<\/h3>\n

          \u76f8\u5173\u51fd\u6570\u3010\u51fd\u6570：\u5c31\u56db\u4e2a\u3011\u3010\u5e94\u7528：\u5c31\u4e00\u4e2a\u2014\u2014\u4f7f\u591a\u4e2a\u4efb\u52a1\u5177\u6709\u5148\u540e\u987a\u5e8f\u5173\u7cfb\u3011<\/p>\n

          \u521d\u59cb\u5316\u8d44\u6e90 : sem_init\u00a0 \u00a0 \u00a0 \u00a0<\/p>\n

          \u9500\u6bc1\u8d44\u6e90\u00a0 \u00a0 :\u00a0 sem_destroy \u7533\u8bf7\u8d44\u6e90\u00a0: sem_wait \u91ca\u653e\u8d44\u6e90\u00a0 \u00a0：sem_post\u00a0 \u00a0 \u00a0 \u00a0<\/p>\n

          sem_init<\/p>\n

          \u539f\u578b：int sem_init(sem_t *sem, int pshared, unsigned int value); \u529f\u80fd:<\/p>\n

          \u00a0 \u00a0 \u00a0 \u00a0 \u5bf9\u4fe1\u53f7\u91cf\u521d\u59cb\u5316 \u53c2\u6570:<\/p>\n

          \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0sem:\u4fe1\u53f7\u91cf\u7a7a\u95f4\u9996\u5730\u5740<\/p>\n

          \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0pshared:\u4fe1\u53f7\u91cf\u7684\u4f5c\u7528\u57df\u7ebf\u7a0b\u95f4\u5171\u4eab \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a00\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u7ebf\u7a0b\u95f4\u5171\u4eab \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u975e0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8fdb\u7a0b\u95f4\u5171\u4eab \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0value:\u4fe1\u53f7\u91cf\u7684\u521d\u59cb\u503c（\u5982 0 \u8868\u793a \u201c\u65e0\u8d44\u6e90\u201d，1 \u8868\u793a \u201c\u6709 1 \u4e2a\u8d44\u6e90\u201d）<\/p>\n

          \u8fd4\u56de\u503c: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6210\u529f\u8fd4\u56de0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5931\u8d25\u8fd4\u56de\u975e0<\/p>\n

          sem_destory<\/p>\n

          \u539f\u578b：int sem_destory(sem_t *sem); \u529f\u80fd:<\/p>\n

          \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u4f7f\u7528\u5b8c\u6bd5\u5c06\u6307\u5b9a\u7684\u4fe1\u53f7\u91cf\u9500\u6bc1\u3002 \u53c2\u6570: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0sem:\u4fe1\u53f7\u91cf\u7a7a\u95f4\u9996\u5730\u5740<\/p>\n

          \u8fd4\u56de\u503c: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6210\u529f\u8fd4\u56de0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5931\u8d25\u8fd4\u56de\u975e0<\/p>\n

          sem_wait<\/p>\n

          \u539f\u578b：int sem_wait(sem_t *sem); \u529f\u80fd:<\/p>\n

          \u00a0 \u00a0 \u00a0 \u00a0 \u7533\u8bf7\u8d44\u6e90，\u8ba9\u8d44\u6e90\u6570-1，\u5982\u679c\u8d44\u6e90\u6570\u4e3a0，\u5219\u963b\u585e\u7b49\u5f85，\u4e00\u65e6\u6709\u8d44\u6e90\u5219\u81ea\u52a8\u7533\u8bf7\u8d44\u6e90\u5e76\u7ee7\u7eed\u8fd0\u884c\u7a0b\u5e8f\u3002 \u53c2\u6570: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0sem:\u4fe1\u53f7\u91cf\u7a7a\u95f4\u9996\u5730\u5740<\/p>\n

          \u8fd4\u56de\u503c: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6210\u529f\u8fd4\u56de0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5931\u8d25\u8fd4\u56de\u975e0<\/p>\n

          sem_post<\/p>\n

          \u539f\u578b：int sem_post(sem_t *sem); \u529f\u80fd:<\/p>\n

          \u00a0 \u00a0 \u00a0 \u00a0 \u91ca\u653e\u8d44\u6e90，\u5c06\u6307\u5b9a\u7684 sem \u4fe1\u53f7\u91cf\u8d44\u6e90\u91ca\u653e，\u8ba9\u8d44\u6e90\u6570+1（\u5373\u6267\u884c sem = sem+1），\u7ebf\u7a0b\u5728\u8be5\u51fd\u6570\u4e0a\u4e0d\u4f1a\u963b\u585e\u3002 \u53c2\u6570: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0sem:\u4fe1\u53f7\u91cf\u7a7a\u95f4\u9996\u5730\u5740<\/p>\n

          \u8fd4\u56de\u503c: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6210\u529f\u8fd4\u56de0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5931\u8d25\u8fd4\u56de\u975e0<\/p>\n

          6.4\u4fe1\u53f7\u91cf\u7684\u4f7f\u7528\u6b65\u9aa4<\/h3>\n

          \u6b65\u9aa4\u662f：\u5b9a\u4e49\u2192\u521d\u59cb\u5316\u2192PV \u64cd\u4f5c\u2192\u9500\u6bc1\u3002<\/p>\n

          6.4.1\u5b9a\u4e49\u4fe1\u53f7\u91cf<\/h4>\n

          #include <semaphore.h>
          \nsem_t sem_r;
          \nsem_t sem_w; <\/p>\n

          6.4.2\u00a0\u521d\u59cb\u5316\u4fe1\u53f7\u91cf<\/h4>\n

          sem_init(&sem_r, 0, 0);
          \nsem_init(&sem_w, 0, 1); <\/p>\n

          6.4.3\u4fe1\u53f7\u91cf\u7684\u64cd\u4f5c\u2014\u2014\u7533\u8bf7\u8d44\u6e90<\/h4>\n

          sem_wait(&sem_w); <\/p>\n

          6.4.4\u4fe1\u53f7\u91cf\u7684\u64cd\u4f5c\u2014\u2014\u91ca\u653e\u8d44\u6e90<\/h4>\n

          sem_post(&sem_r); <\/p>\n

          6.4.5\u9500\u6bc1\u4fe1\u53f7\u91cf<\/h4>\n

          sem_destroy(&sem_r);
          \nsem_destroy(&sem_w); <\/p>\n

          6.4.6\u4fe1\u53f7\u91cf\u540c\u6b65\u5b9e\u6218\u793a\u4f8b<\/h4>\n

          #include <stdio.h>
          \n#include <stdlib.h> \/\/ \u7528\u4e8e\u7ed9\u6307\u9488\u7f6e\u7a7a
          \n#include <string.h>
          \n#include <pthread.h> \/\/\u7528\u4e8e\u7ebf\u7a0b\u76f8\u5173\u51fd\u6570
          \n#include <semaphore.h> \/\/\u7528\u4e8e\u4fe1\u53f7\u91cf\u76f8\u5173\u51fd\u6570<\/p>\n

          char tmpbuffer[4096] = {0};
          \nsem_t sem_r; \/\/\u8bfb\u8d44\u6e90
          \nsem_t sem_w; \/\/\u5199\u8d44\u6e90(\u5199\u8fdbtmpbuffer)<\/p>\n

          void* threadfun1(void* arg) \/\/\u5199
          \n{
          \n printf("\u7ebf\u7a0b\u5f00\u59cb\u6267\u884c（TID：%#x）\\\\n",(unsigned int)pthread_self());\/\/%#x:\u5341\u516d\u8fdb\u5236\u6570，\u5c0f\u5199\u5b57\u6bcd，\u5e76\u81ea\u52a8\u6dfb\u52a0 0x\u524d\u7f00\u3002<\/p>\n

          while(1) \/\/\u6b7b\u5faa\u73af\u662f\u4e3a\u4e86\u9632\u6b62\u8fdb\u7a0b\u7ed3\u675f，\u56e0\u4e3a\u8fdb\u7a0b\u4e0d\u5728\u7ebf\u7a0b\u4e5f\u4e0d\u5728
          \n {
          \n sem_wait(&sem_w);
          \n gets(tmpbuffer);
          \n sem_post(&sem_r);
          \n if(0 == strcmp(tmpbuffer,".quit"))
          \n {
          \n break;
          \n }
          \n }
          \n return NULL;
          \n}<\/p>\n

          void* threadfun2(void* arg) \/\/\u8bfb\u51fa\u6765
          \n{
          \n printf("\u7ebf\u7a0b\u5f00\u59cb\u6267\u884c（TID：%#x）\\\\n",(unsigned int)pthread_self());\/\/%#x:\u5341\u516d\u8fdb\u5236\u6570，\u5c0f\u5199\u5b57\u6bcd，\u5e76\u81ea\u52a8\u6dfb\u52a0 0x\u524d\u7f00\u3002<\/p>\n

          while(1) \/\/\u6b7b\u5faa\u73af\u662f\u4e3a\u4e86\u9632\u6b62\u8fdb\u7a0b\u7ed3\u675f，\u56e0\u4e3a\u8fdb\u7a0b\u4e0d\u5728\u7ebf\u7a0b\u4e5f\u4e0d\u5728
          \n {
          \n sem_wait(&sem_r);
          \n if(0 == strcmp(tmpbuffer,".quit"))
          \n {
          \n break;
          \n }<\/p>\n

          printf("tmpbuff = %s\\\\n",tmpbuffer);
          \n sem_post(&sem_w);
          \n }
          \n return NULL;
          \n}<\/p>\n

          int main(void)
          \n{
          \n int ret1 = 0;
          \n int ret2 = 0; <\/p>\n

          pthread_t tid1;\/\/\u521b\u5efa\u7ebf\u7a0b
          \n pthread_t tid2;<\/p>\n

          sem_init(&sem_r,0,1);
          \n sem_init(&sem_w,0,0);<\/p>\n

          ret1 =pthread_create(&tid1,NULL,threadfun1,NULL);\/\/\u521b\u5efa\u7ebf\u7a0b1
          \n ret2 =pthread_create(&tid2,NULL,threadfun2,NULL);
          \n#if 1
          \n if(ret1 != 0 || ret2 != 0)
          \n {
          \n perror("fail to pthread_create");
          \n return -1;
          \n }
          \n#endif
          \n pthread_join(tid1,NULL);\/\/\u963b\u585e\u56de\u6536\u7ebf\u7a0b
          \n pthread_join(tid2,NULL);<\/p>\n

          sem_destroy(&sem_r);\/\/\u4fe1\u53f7\u91cf\u7684\u9500\u6bc1
          \n sem_destroy(&sem_w);\/\/\u4fe1\u53f7\u91cf\u7684\u9500\u6bc1 <\/p>\n

          return 0;
          \n} <\/p>\n","protected":false},"excerpt":{"rendered":"

          \u76ee\u5f55
          \n1.\u91cd\u8981\u6982\u5ff5
          \n2.\u7ebf\u7a0b\u95f4\u901a\u4fe1\u5b9e\u73b0\u65b9\u5f0f\u2014\u2014\u6700\u7b80\u5355\u7684\u65b9\u6cd5:\u5168\u5c40\u53d8\u91cf\u9501（\u4e92\u65a5\u9501）
          \n3.\u539f\u5b50\u64cd\u4f5c
          \n4.\u4e92\u65a5\u9501（Mutex）
          \n4.1\u4e92\u65a5\u9501\u76f8\u5173\u6982\u5ff5
          \n4.2\u4e92\u65a5\u9501\u76f8\u5173\u51fd\u6570（pthread \u5e93）
          \n4.3\u4e92\u65a5\u9501\u4f7f\u7528\u6b65\u9aa4
          \n4.3.1\u5b9a\u4e49\u4e92\u65a5\u9501
          \n4.3.2\u521d\u59cb\u5316\u4e92\u65a5\u9501
          \n4.3.3\u52a0\u9501（\u8fdb\u5165\u4e34\u754c\u533a）
          \n4.3.4\u89e3\u9501（\u79bb\u5f00\u4e34\u754c\u533a） <\/p>\n","protected":false},"author":2,"featured_media":78288,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[58,76,190],"topic":[],"class_list":["post-78289","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-linux","tag-vscode","tag-190"],"yoast_head":"\nLinux\uff1a\u7ebf\u7a0b\u95f4\u901a\u4fe1 - \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\/78289.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux\uff1a\u7ebf\u7a0b\u95f4\u901a\u4fe1 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u76ee\u5f55 1.\u91cd\u8981\u6982\u5ff5 2.\u7ebf\u7a0b\u95f4\u901a\u4fe1\u5b9e\u73b0\u65b9\u5f0f\u2014\u2014\u6700\u7b80\u5355\u7684\u65b9\u6cd5:\u5168\u5c40\u53d8\u91cf\u9501（\u4e92\u65a5\u9501） 3.\u539f\u5b50\u64cd\u4f5c 4.\u4e92\u65a5\u9501（Mutex） 4.1\u4e92\u65a5\u9501\u76f8\u5173\u6982\u5ff5 4.2\u4e92\u65a5\u9501\u76f8\u5173\u51fd\u6570（pthread \u5e93） 4.3\u4e92\u65a5\u9501\u4f7f\u7528\u6b65\u9aa4 4.3.1\u5b9a\u4e49\u4e92\u65a5\u9501 4.3.2\u521d\u59cb\u5316\u4e92\u65a5\u9501 4.3.3\u52a0\u9501（\u8fdb\u5165\u4e34\u754c\u533a） 4.3.4\u89e3\u9501（\u79bb\u5f00\u4e34\u754c\u533a）\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/78289.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-26T12:17:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/02\/20260226121735-69a039df2939b.png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/78289.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/78289.html\",\"name\":\"Linux\uff1a\u7ebf\u7a0b\u95f4\u901a\u4fe1 - 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