- \n
- \u8d44\u6e90\u5171\u4eab\uff08\u72ec\u4eab\u8d44\u6e90\u5219\u4e0d\u4f1a\uff09<\/li>\n\n\n\n
- \u8c03\u5ea6\u968f\u673a\uff08\u610f\u5473\u7740\u6570\u636e\u8bbf\u95ee\u4f1a\u51fa\u73b0\u7ade\u4e89\uff09<\/li>\n\n\n\n
- \u7ebf\u7a0b\u95f4\u7f3a\u4e4f\u5fc5\u8981\u7684\u540c\u6b65\u673a\u5236<\/li>\n<\/ul>\n\n\n\n
\u4e0a\u9762\u8fd9\u4e09\u70b9\uff0c\u524d\u4e24\u70b9\u65e0\u6cd5\u6539\u53d8\uff08\u7ebf\u7a0b\u8c03\u5ea6\u7b97\u6cd5\u7531cpu\u51b3\u5b9a\uff0c\u65e0\u6cd5\u6539\u53d8\uff09\uff0c\u56e0\u6b64\u8981\u89e3\u51b3\u6570\u636e\u6df7\u4e71\u95ee\u9898\u53ea\u80fd\u4ece\u7b2c\u4e09\u70b9\u5165\u624b\uff0c\u4f7f\u5f97\u591a\u4e2a\u7ebf\u7a0b\u5728\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u7684\u65f6\u5019\uff0c\u51fa\u73b0\u4e92\u65a5<\/p>\n\n\n\n
\u5efa\u8bae\u9501<\/h4>\n\n\n\n
\u5bf9\u516c\u5171\u6570\u636e\u8fdb\u884c\u4fdd\u62a4\uff0c\u4f46\u5efa\u8bae\u9501\u672c\u8eab\u4e0d\u5177\u5907\u5f3a\u5236\u6027\uff0c\u53ea\u80fd\u901a\u8fc7\u4ee3\u7801\u903b\u8f91\u6765\u52a0\u4ee5\u9650\u5236\u3002\u6240\u6709\u7ebf\u7a0b\u5e94\u8be5<\/strong>\u5728\u8bbf\u95ee\u516c\u5171\u6570\u636e\u524d\u5148\u62ff\u9501\u518d\u8bbf\u95ee\uff0c\u4f46\u5982\u679c\u6709\u4e00\u4e2a\u7ebf\u7a0b\u7684\u4ee3\u7801\u4e0d\u9075\u5b88\u6b64\u6d41\u7a0b\uff0c\u76f4\u63a5\u53bb\u8bbf\u95ee\u516c\u5171\u6570\u636e\uff0c\u7ed3\u679c\u5c31\u662f\u6570\u636e\u4e5f\u80fd\u8bbf\u95ee\u5230\uff08\u56e0\u4e3a\u50cf\u5168\u5c40\u53d8\u91cf\u8fd9\u79cd\u516c\u5171\u6570\u636e\u662f\u5728\u6240\u6709\u7ebf\u7a0b\u95f4\u5171\u4eab\u7684\uff09\uff0c\u4f46\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u6df7\u4e71<\/p>\n\n\n\n
\u4e92\u65a5\u91cfmutex<\/h2>\n\n\n\n
Linux\u4e2d\u63d0\u4f9b\u4e00\u628a\u4e92\u65a5\u9501mutex\uff08\u4e5f\u79f0\u4e4b\u4e3a\u4e92\u65a5\u91cf\uff09<\/p>\n\n\n\n
\u6bcf\u4e2a\u7ebf\u7a0b\u5728\u5bf9\u8d44\u6e90\u64cd\u4f5c\u524d\u90fd\u5c1d\u8bd5\u5148\u52a0\u9501\uff0c\u6210\u529f\u52a0\u9501\u624d\u80fd\u64cd\u4f5c\uff0c\u64cd\u4f5c\u7ed3\u675f\u89e3\u9501\uff0c\u540c\u4e00\u65f6\u523b\u53ea\u80fd\u6709\u4e00\u4e2a\u7ebf\u7a0b\u6301\u6709\u8be5\u9501<\/p>\n\n\n\n
\u8d44\u6e90\u8fd8\u662f\u5171\u4eab\u7684\uff0c\u7ebf\u7a0b\u95f4\u4e5f\u8fd8\u662f\u7ade\u4e89\u7684\uff0c\u4f46\u901a\u8fc7\u4e00\u628a\u9501\u5c31\u5c06\u8d44\u6e90\u7684\u8bbf\u95ee\u53d8\u6210\u4e86\u4e92\u65a5\u64cd\u4f5c\uff0c\u907f\u514d\u4ea7\u751f\u4e0e\u65f6\u95f4\u6709\u5173\u7684\u9519\u8bef<\/p>\n\n\n\n
\u4f7f\u7528\u573a\u666f\uff1a\u4e00\u4e2a\u5171\u4eab\u8d44\u6e90\uff0c\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee<\/p>\n\n\n
\n![\"\"](\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\")
<\/div><\/figure>\n<\/div>\n\n\n\u4f7f\u7528mutex\u4e00\u822c\u6b65\u9aa4\uff1a<\/h4>\n\n\n\n
pthread_mutex_t<\/code> \u7c7b\u578b\u672c\u8d28\u662f\u4e00\u4e2a\u7ed3\u6784\u4f53\uff0c\u53ef\u5c06\u5176\u7b80\u5355\u770b\u6210\u6574\u6570\uff0c\u521d\u59cb\u5316\u540e\u503c\u4e3a1<\/p>\n\n\n\n- \n
pthread_mutex_t mutex;<\/code> \u521b\u5efa\u4e92\u65a5\u9501\uff08\u53d8\u91cfmutex<\/code>\u53ea\u67091\u30010\u4e24\u79cd\u53d6\u503c\uff09<\/li>\n\n\n\npthread_mutex_init(&mutex, NULL);<\/code> \u521d\u59cb\u5316\u4e3a1<\/li>\n\n\n\npthread_mutex_lock(&mutex);<\/code> \u52a0\u9501\u505a\u4e00\u6b21–\u64cd\u4f5c\uff0c1\u2192>0\uff0c\u963b\u585e\u7ebf\u7a0b<\/li>\n\n\n\n- \u8bbf\u95ee\u5171\u4eab\u6570\u636e(
stdout<\/code>)<\/li>\n\n\n\npthrad_mutext_unlock(&mutex);<\/code> \u89e3\u9501\u505a\u4e00\u6b21++\u64cd\u4f5c\uff0c0\u21921\uff0c\u5524\u9192\u963b\u585e\u5728\u9501\u4e0a\u7684\u7ebf\u7a0b<\/li>\n\n\n\npthead_mutex_destroy(&mutex);<\/code> \u9500\u6bc1\u4e92\u65a5\u9501<\/li>\n<\/ol>\n\n\n\n\u6ce8\u610f\u4e8b\u9879\uff1a\u5c3d\u91cf\u4fdd\u8bc1\u9501\u7684\u7c92\u5ea6\u8d8a\u5c0f\u8d8a\u597d\uff08\u8bbf\u95ee\u5171\u4eab\u6570\u636e\u524d\u52a0\u9501\uff0c\u8bbf\u95ee\u7ed3\u675f\u540e\u7acb\u5373<\/strong>\u89e3\u9501\uff09<\/p>\n\n\n\n
trylock\uff1a\u5c1d\u8bd5\u52a0\u9501\uff0c\u6210\u529f1\u21920\uff0c\u5931\u8d25\u5219\u8fd4\u56de\uff0c\u540c\u65f6\u8bbe\u7f6e\u9519\u8bef\u53f7EBUSY<\/p>\n\n\n\n
\u521d\u59cb\u5316\u4e92\u65a5\u91cf<\/strong>\uff1apthread_mutex_t mutex;<\/p>\n\n\n\n
- \n
- \u52a8\u6001\u521d\u59cb\u5316\uff1a
pthread_mutex_init(&mutex, NULL);<\/code><\/li>\n\n\n\n- \u9759\u6001\u521d\u59cb\u5316\uff1a
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;<\/code><\/li>\n<\/ul>\n\n\n\n\u6b7b\u9501<\/h4>\n\n\n\n
\u6b7b\u9501\u4e0d\u662f\u4e00\u628a\u9501\uff0c\u800c\u662f\u4f7f\u7528\u9501\u4e0d\u6070\u5f53\u5bfc\u81f4\u7684\u73b0\u8c61<\/p>\n\n\n\n
\u4ea7\u751f\u539f\u56e0\uff1a<\/p>\n\n\n\n
- \n
- \u5bf9\u4e00\u628a\u9501\u53cd\u590dlock<\/li>\n\n\n\n
- \u4e24\u4e2a\u7ebf\u7a0b\uff0c\u5404\u81ea\u6301\u6709\u4e00\u628a\u9501\uff0c\u8bf7\u6c42\u53e6\u4e00\u628a <\/li>\n<\/ul>\n\n\n\n
\u907f\u514d\u65b9\u6cd5\uff1a<\/p>\n\n\n\n
- \n
- \u4fdd\u8bc1\u8d44\u6e90\u7684\u83b7\u53d6\u987a\u5e8f\uff0c\u8981\u6c42\u6bcf\u4e2a\u7ebf\u7a0b\u83b7\u53d6\u8d44\u6e90\u7684\u987a\u5e8f\u4e00\u81f4<\/li>\n\n\n\n
- \u5f53\u5f97\u4e0d\u5230\u6240\u6709\u6240\u9700\u8d44\u6e90\u65f6\uff0c\u4e3b\u52a8\u653e\u5f03\u5df2\u7ecf\u83b7\u5f97\u7684\u8d44\u6e90\uff0c\u7b49\u5f85<\/li>\n<\/ul>\n\n\n\n
restrict\u5173\u952e\u5b57<\/strong>\uff1a\u7528\u6765\u9650\u5b9a\u6307\u9488\u53d8\u91cf\uff0c\u88ab\u8be5\u5173\u952e\u5b57\u9650\u5b9a\u7684\u6307\u9488\u53d8\u91cf\u6240\u6307\u5411\u7684\u5185\u5b58\u64cd\u4f5c\uff0c\u5fc5\u987b\u7531\u672c\u6307\u9488\u5b8c\u6210 <\/p>\n\n\n\n
\u8bfb\u5199\u9501<\/h2>\n\n\n\n
\u9501\u53ea\u6709\u4e00\u628a<\/strong>\uff0c\u4ee5\u8bfb\u65b9\u5f0f\u7ed9\u6570\u636e\u52a0\u9501\u2192\u8bfb\u9501\uff0c\u4ee5\u5199\u65b9\u5f0f\u7ed9\u6570\u636e\u52a0\u9501\u2192\u5199\u9501 <\/p>\n\n\n\n
\u8bfb\u5171\u4eab\uff0c\u5199\u72ec\u5360<\/strong>\uff0c\u4e5f\u53eb\u5171\u4eab\u72ec\u5360\u9501<\/p>\n\n\n\n
\u5199\u9501\u4f18\u5148\u7ea7\u9ad8<\/strong> <\/p>\n\n\n\n
\u4f7f\u7528\u573a\u666f\uff1a\u9002\u5408\u4e8e\u5bf9\u6570\u636e\u7ed3\u6784\u8bfb\u7684\u6b21\u6570\u8fdc\u5927\u4e8e\u5199<\/p>\n\n\n\n
\u7279\u6027\uff1a<\/p>\n\n\n\n
- \n
- \u8bfb\u5199\u9501\u662f\u201c\u5199\u6a21\u5f0f\u52a0\u9501\u201c\u65f6\uff0c\u89e3\u9501\u524d\uff0c\u6240\u6709\u5bf9\u8be5\u9501\u52a0\u9501\u7684\u7ebf\u7a0b\u90fd\u4f1a\u88ab\u963b\u585e<\/li>\n\n\n\n
- \u8bfb\u5199\u9501\u662f\u201c\u8bfb\u6a21\u5f0f\u52a0\u9501\u201d\u65f6\uff0c\u5982\u679c\u53ea\u6709<\/strong>\u4ee5\u8bfb\u6a21\u5f0f\u7684\u7ebf\u7a0b\u5bf9\u5176\u52a0\u9501\u4f1a\u6210\u529f<\/strong>\uff0c\u5982\u679c\u7ebf\u7a0b\u4ee5\u5199\u6a21\u5f0f\u52a0\u9501\u4f1a\u963b\u585e<\/li>\n\n\n\n
- \u65e2\u6709\u8bd5\u56fe\u4ee5\u5199\u6a21\u5f0f\u52a0\u9501\u7684\u7ebf\u7a0b\uff0c\u4e5f\u6709\u8bd5\u56fe\u4ee5\u8bfb\u6a21\u5f0f\u52a0\u9501\u7684\u7ebf\u7a0b\uff0c\u90a3\u4e48\u8bfb\u5199\u9501\u4f1a\u963b\u585e\u968f\u540e\u7684\u8bfb\u6a21\u5f0f\u9501\u8bf7\u6c42\uff0c\u4f18\u5148\u6ee1\u8db3\u5199\u6a21\u5f0f\u9501\u3002\u8bfb\u9501\u3001\u5199\u9501\u5e76\u884c\u963b\u585e\u65f6\uff0c\u5199\u9501\u4f18\u5148\u7ea7\u9ad8<\/strong><\/li>\n<\/ul>\n\n\n\n
\u76f8\u8f83\u4e8e\u4e92\u65a5\u91cf\u800c\u8a00\uff0c\u5f53\u8bfb\u7ebf\u7a0b\u591a\u7684\u65f6\u5019\uff0c\u8bfb\u5199\u9501\u8bbf\u95ee\u6548\u7387\u9ad8<\/p>\n\n\n\n
\u51fd\u6570\u539f\u578b\uff1a<\/p>\n\n\n\n
- \n
pthread_rwlock_t rwlock;<\/code><\/li>\n\n\n\npthread_rwlock_init(&rwlock, NULL);<\/code><\/li>\n\n\n\npthread_rwlock_rdlock(&rwlock); try<\/code><\/li>\n\n\n\npthread_rwlock_wrlock(&rwlock); try<\/code><\/li>\n\n\n\npthread_rwlock_unlock(&rwlock);<\/code><\/li>\n\n\n\npthread_rwlock_destroy(&rwlock);<\/code><\/li>\n<\/ul>\n\n\n\n\u6761\u4ef6\u53d8\u91cf<\/h2>\n\n\n\n
\u672c\u8eab\u4e0d\u662f\u9501<\/strong> \u901a\u5e38\u4e0e\u4e92\u65a5\u9501mutex\u914d\u5408\u4f7f\u7528<\/p>\n\n\n\n
pthread_cond_t cond;<\/code><\/p>\n\n\n\n\u521d\u59cb\u5316\u6761\u4ef6\u53d8\u91cf\uff1a<\/p>\n\n\n\n
- \n
- \u52a8\u6001\u521d\u59cb\u5316\uff1a
pthread_cond_init(&cond, NULL); <\/code><\/li>\n\n\n\n- \u9759\u6001\u521d\u59cb\u5316\uff1a
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;<\/code><\/li>\n<\/ul>\n\n\n\n\u6761\u4ef6\u53d8\u91cf\u51fd\u6570<\/h4>\n\n\n\n
pthread_cond_wait(&cond, &mutex); \u963b\u585e\u7b49\u5f85\u4e00\u4e2a\u6761\u4ef6\u53d8\u91cf\u6ee1\u8db3<\/p>\n\n\n\n
\u4f5c\u7528\uff1a <\/p>\n\n\n\n
- \n
- \u963b\u585e\u7b49\u5f85\u6761\u4ef6\u53d8\u91cf\u6ee1\u8db3<\/li>\n\n\n\n
- \u89e3\u9501\u5df2\u7ecf\u52a0\u9501\u6210\u529f\u7684\u4fe1\u53f7\u91cf\uff0c\u76f8\u5f53\u4e8e\u8c03\u7528pthread_mutex_unlock(&mutex)\uff0c\u4e141.2.\u4e24\u6b65\u4e3a\u4e00\u4e2a\u539f\u5b50\u64cd\u4f5c<\/li>\n\n\n\n
- \u5f53\u6761\u4ef6\u6ee1\u8db3\uff0c\u51fd\u6570\u8fd4\u56de\u65f6\uff0c\u89e3\u9664\u963b\u585e\uff0c\u91cd\u65b0\u52a0\u9501\u4fe1\u53f7\u91cf\uff0c\u76f8\u5f53\u4e8e\u8c03\u7528pthread_mutex_lock(&mutex);<\/li>\n<\/ol>\n\n\n\n
\u4ee5\u6d88\u8d39\u8005\u4e3e\u4f8b\uff0c\u5148\u52a0\u4e92\u65a5\u9501\uff0c\u5982\u679c\u6ca1\u6709\u4ea7\u54c1\u5219\u963b\u585e\u7b49\u5f85\uff0c\u5728\u7b49\u5f85\u8fc7\u7a0b\u4e2d\uff0c\u4e92\u65a5\u9501\u5df2\u89e3\uff08\u4e0d\u7136\u751f\u4ea7\u8005\u600e\u4e48\u52a0\u9501\u53bb\u751f\u4ea7\uff09\uff0c\u5f53\u6761\u4ef6\u53d8\u91cf\u6ee1\u8db3\uff0c\u5373\u6709\u4ea7\u54c1\u4e86\uff0c\u51fd\u6570\u8fd4\u56de\uff0c\u6d88\u8d39\u8005\u91cd\u65b0\u52a0\u9501\uff0c\u7136\u540e\u53bb\u6d88\u8d39\u4ea7\u54c1\uff0c\u6700\u540e\u89e3\u9501 <\/p>\n\n\n\n
<\/div><\/figure>\n\n\n\nint pthread_cond_timedwait(pthread_cond_t *restrict cond, pthread_mutex_t *restrict mutex, const struct timespec *restrict abstime); \u8ba1\u65f6\u963b\u585e\u7b49\u5f85\u4e00\u4e2a\u6761\u4ef6\u53d8\u91cf\u6ee1\u8db3\uff0c\u65f6\u95f4\u4e00\u5230\u5219\u653e\u5f03\u7b49\u5f85<\/p>\n\n\n\n
pthread_cond_signal()\uff1a\u5524\u9192\u963b\u585e\u5728\u6761\u4ef6\u53d8\u91cf\u4e0a\u7684(\u81f3\u5c11)\u4e00\u4e2a\u7ebf\u7a0b <\/p>\n\n\n\n
pthread_cond_broadcast()\uff1a\u5524\u9192\u963b\u585e\u5728\u6761\u4ef6\u53d8\u91cf\u4e0a\u7684\u6240\u6709\u7ebf\u7a0b\uff08\u60ca\u7fa4\u6548\u5e94 \u8c28\u614e\u4f7f\u7528\uff09<\/p>\n\n\n\n
\u751f\u6210\u8005\u6d88\u8d39\u8005<\/h4>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u7f16\u7a0b\u7ec3\u4e60\uff1a\u501f\u52a9\u6761\u4ef6\u53d8\u91cf\u5b8c\u6210\u7ebf\u7a0b\u95f4\u540c\u6b65\uff0c\u5b9e\u73b0\u751f\u6210\u8005\u6d88\u8d39\u8005\u6a21\u578b <\/p>\n\n\n\n
\/\/\u501f\u52a9\u6761\u4ef6\u53d8\u91cf\u5b9e\u73b0\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\n#include<stdio.h>\n#include<stdlib.h>\n#include<string.h>\n#include<fcntl.h>\n#include<unistd.h>\n#include<pthread.h>\n#include<sys\/stat.h>\n#include<sys\/mman.h>\n#include<dirent.h>\n#include<errno.h>\n#include<signal.h>\n\n\/\/\u94fe\u8868\u4f5c\u4e3a\u5171\u4eab\u6570\u636e\uff0c\u9700\u8981\u88ab\u4e92\u65a5\u9501\u4fdd\u62a4\nstruct msg {\n struct msg *next;\n int num;\n};\n\nstruct msg *head;\n\n\/\/\u9759\u6001\u521d\u59cb\u5316\u4e00\u4e2a\u6761\u4ef6\u53d8\u91cf\u548c\u4e00\u4e2a\u4e92\u65a5\u9501\npthread_cond_t has_product = PTHREAD_COND_INITIALIZER;\npthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;\n\nvoid *producer(void *p) {\n struct msg *mp;\n while(1) {\n mp = malloc(sizeof(struct msg));\n mp->num = rand() % 1000 + 1; \/\/\u6a21\u62df\u751f\u4ea7\u4e00\u4e2a\u4ea7\u54c1\n printf(\"-Produce-----------%d\\n\", mp->num);\n\n pthread_mutex_lock(&lock);\n mp->next = head;\n head = mp;\n pthread_mutex_unlock(&lock);\n\n pthread_cond_signal(&has_product); \/\/\u5c06\u7b49\u5f85\u5728\u8be5\u6761\u4ef6\u53d8\u91cf\u4e0a\u7684\u4e00\u4e2a\u7ebf\u7a0b\u5524\u9192\n sleep(rand() % 5);\n }\n}\n\nvoid *consumer(void *p) {\n struct msg *mp;\n while(1) {\n pthread_mutex_lock(&lock);\n \/\/\u5728\u8fd9\u91ccwhile\u53ef\u4ee5\u6362\u6210if\uff0c\u56e0\u4e3a\u53ea\u6709\u4e00\u4e2a\u751f\u4ea7\u8005\u4e00\u4e2a\u6d88\u8d39\u8005\uff0c\u4f46\u82e5\u6709\u591a\u4e2a\u6d88\u8d39\u8005\u5c31\u5fc5\u987b\u7528while\n \/\/\u56e0\u4e3a\u53ef\u80fd\u6709\u5176\u5b83\u6d88\u8d39\u8005\u5148\u62ff\u5230\u9501\uff0c\u5403\u4e86\u4ea7\u54c1\uff0c\u6240\u4ee5\u8981\u5faa\u73af\u5224\u65ad\u5f53\u524d\u662f\u5426\u6709\u4ea7\u54c1\n \/\/\u591a\u4e2a\u6d88\u8d39\u8005\u6a21\u578b\u5b9e\u73b0\u4e5f\u5f88\u7b80\u5355\uff0c\u5728main\u51fd\u6570\u91cc\u591acreate\u51e0\u4e2a\u6d88\u8d39\u8005\u7ebf\u7a0b\u5373\u53ef\n while(head == NULL) { \n pthread_cond_wait(&has_product, &lock);\n }\n mp = head;\n head = mp->next;\n pthread_mutex_unlock(&lock);\n\n printf(\"-Consume %lu---%d\\n\", pthread_self(), mp->num);\n free(mp);\n sleep(rand() % 5);\n }\n}\n\nint main(int argc, char *argv[]) {\n pthread_t pdid, csid;\n srand(time(NULL));\n\n pthread_create(&pdid, NULL, producer, NULL);\n pthread_create(&csid, NULL, consumer, NULL);\n\n pthread_join(pdid, NULL);\n pthread_join(csid, NULL);\n\n return 0;\n}\n<\/code><\/pre>\n\n\n\n\u4fe1\u53f7\u91cf<\/h2>\n\n\n\n
\u4e92\u65a5\u91cf\u867d\u7136\u4fdd\u8bc1\u4e86\u591a\u7ebf\u7a0b\u64cd\u4f5c\u65f6\u7684\u6570\u636e\u6b63\u786e\u6027\uff0c\u4f46\u6bcf\u6b21\u53ea\u80fd\u4e00\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u5171\u4eab\u6570\u636e\uff0c\u7ebf\u7a0b\u4ece\u5e76\u884c\u6267\u884c\u53d8\u6210\u4e86\u4e32\u884c\u6267\u884c\uff0c\u5bfc\u81f4\u7ebf\u7a0b\u7684\u5e76\u53d1\u6027\u5927\u5927\u4e0b\u964d<\/p>\n\n\n\n
\u4fe1\u53f7\u91cf\u662f\u76f8\u5bf9\u6298\u4e2d\u7684\u4e00\u79cd\u5904\u7406\u65b9\u5f0f\uff0c\u65e2\u80fd\u4fdd\u8bc1\u540c\u6b65\uff0c\u6570\u636e\u4e0d\u6df7\u4e71\uff0c\u53c8\u80fd\u63d0\u9ad8\u7ebf\u7a0b\u5e76\u53d1\u91cf\uff08\u4fe1\u53f7\u91cf\u548c\u4fe1\u53f7\u6beb\u65e0\u5173\u8054\uff09<\/p>\n\n\n\n
\u4fe1\u53f7\u91cf\u76f8\u5f53\u4e8e\u521d\u59cb\u5316\u503c\u4e3aN\u7684\u4e92\u65a5\u91cf(N\u8868\u793a\u53ef\u4ee5\u540c\u65f6\u8bbf\u95ee<\/strong>\u5171\u4eab\u6570\u636e\u533a\u7684\u7ebf\u7a0b\u6570)\uff0c\u5e94\u7528\u4e8e\u7ebf\u7a0b\u3001\u8fdb\u7a0b<\/strong>\u95f4\u540c\u6b65<\/p>\n\n\n\n
\u76f8\u5173\u51fd\u6570\uff1a<\/h4>\n\n\n\n
sem_t sem;<\/code> \u5b9a\u4e49\u4fe1\u53f7\u91cf<\/p>\n\n\n\nint sem_init(sem_t *sem, int pshared, unsigned int value);<\/code> \u521d\u59cb\u5316<\/p>\n\n\n\n\u53c2\u6570\uff1a<\/p>\n\n\n\n
- \n
- sem\uff1a\u4fe1\u53f7\u91cf <\/li>\n\n\n\n
- pshared\uff1a\n
- \n
- 0\uff1a\u7528\u4e8e\u7ebf\u7a0b\u95f4\u540c\u6b65<\/li>\n\n\n\n
- 1\uff1a\u7528\u4e8e\u8fdb\u7a0b\u95f4\u540c\u6b65<\/li>\n<\/ul>\n<\/li>\n\n\n\n
- value\uff1aN\u503c(\u6307\u5b9a\u540c\u65f6\u8bbf\u95ee\u7684\u7ebf\u7a0b\u6570)<\/li>\n<\/ul>\n\n\n\n
sem_wait();<\/code> \u4e00\u6b21\u8c03\u7528\uff0c\u505a\u4e00\u6b21- -\u64cd\u4f5c\uff0c \u5f53\u4fe1\u53f7\u91cf\u7684\u503c\u4e3a 0 \u65f6\uff0c\u518d\u6b21- -\u5c31\u4f1a\u963b\u585e\uff08\u76f8\u5f53\u4e8epthread_mutex_lock<\/code>\uff09sem_post();<\/code> \u4e00\u6b21\u8c03\u7528\uff0c\u505a\u4e00\u6b21++\u64cd\u4f5c. \u5f53\u4fe1\u53f7\u91cf\u7684\u503c\u4e3a N \u65f6, \u518d\u6b21 ++ \u5c31\u4f1a\u963b\u585e\uff08\u76f8\u5f53\u4e8epthread_mutex_unlock<\/code>\uff09<\/p>\n\n\n\nsem_destroy();<\/code> \u9500\u6bc1\u4fe1\u53f7\u91cf<\/p>\n\n\n\n\u751f\u6210\u8005\u6d88\u8d39\u8005<\/h4>\n\n\n\n
<\/div><\/figure>\n\n\n\n\u7f16\u7a0b\u7ec3\u4e60\uff1a\u501f\u52a9\u4fe1\u53f7\u91cf\u5b8c\u6210\u7ebf\u7a0b\u95f4\u540c\u6b65\uff0c\u5b9e\u73b0\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b<\/p>\n\n\n\n
\/\/\u4fe1\u53f7\u91cf\u5b9e\u73b0\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u95ee\u9898\n#include<stdio.h>\n#include<stdlib.h>\n#include<string.h>\n#include<fcntl.h>\n#include<unistd.h>\n#include<pthread.h>\n#include<sys\/stat.h>\n#include<sys\/mman.h>\n#include<dirent.h>\n#include<errno.h>\n#include<signal.h>\n#include<semaphore.h>\n\n#define NUM 5\nint queue[NUM]; \/\/\u5168\u5c40\u6570\u7ec4\u5b9e\u73b0\u73af\u5f62\u961f\u5217\nsem_t blank_num, product_num; \/\/\u7a7a\u683c\u5b50\u4fe1\u53f7\u91cf \u4ea7\u54c1\u4fe1\u53f7\u91cf\n\nvoid *producer(void *arg) {\n int i = 0;\n while(1) {\n sem_wait(&blank_num); \/\/\u751f\u4ea7\u8005\u5c06\u7a7a\u683c\u6570-- \u4e3a0\u5219\u963b\u585e\u7b49\u5f85\n queue[i] = rand() % 1000 + 1; \/\/\u6a21\u62df\u751f\u4ea7\u4e00\u4e2a\u4ea7\u54c1\n printf(\"---Produce---%d\\n\", queue[i]);\n sem_post(&product_num); \/\/\u5c06\u4ea7\u54c1\u6570++\n\n i = (i+1) % NUM; \/\/\u501f\u52a9\u4e0b\u6807\u5b9e\u73b0\u73af\u5f62\n sleep(rand() % 1);\n }\n}\n\nvoid *consumer(void *arg) {\n int i = 0;\n while(1) {\n sem_wait(&product_num); \/\/\u6d88\u8d39\u8005\u5c06\u4ea7\u54c1\u6570-- \u4e3a0\u5219\u963b\u585e\u7b49\u5f85\n printf(\"-Consume-%d\\n\", queue[i]);\n queue[i] = 0; \/\/\u6a21\u62df\u6d88\u8d39\u4e00\u4e2a\u4ea7\u54c1\n sem_post(&blank_num); \/\/\u7a7a\u683c\u6570++\n\n i = (i+1) % NUM;\n sleep(rand() % 3);\n }\n}\n\nint main(int argc, char *argv[]) {\n pthread_t pdid, csid;\n\n sem_init(&blank_num, 0, NUM); \/\/\u53c22\u4e3a0\u8868\u793a\u7ebf\u7a0b\u95f4\u5171\u4eab \u53c23\u8868\u793a\u521d\u59cb\u5316\u7a7a\u683c\u5b50\u4fe1\u53f7\u91cf\u4e3a5\n sem_init(&product_num, 0, 0); \/\/\u4ea7\u54c1\u6570\u4e3a0\n\n pthread_create(&pdid, NULL, producer, NULL);\n pthread_create(&csid, NULL, consumer, NULL);\n\n pthread_join(pdid, NULL);\n pthread_join(csid, NULL);\n\n sem_destroy(&blank_num);\n sem_destroy(&product_num);\n\n return 0;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u7ebf\u7a0b\u540c\u6b65 \u540c\u6b65\u5373\u534f\u540c\u6b65\u8c03\uff0c\u591a\u4e2a\u7ebf\u7a0b\u5bf9\u516c\u5171\u533a\u57df\u6570\u636e\u6309\u5e8f\u8bbf\u95ee\uff0c\u9632\u6b62\u6570\u636e\u6df7\u4e71\uff0c\u4ea7\u751f\u4e0e\u65f6\u95f4\u6709\u5173\u7684\u9519\u8bef\u3002 \u7ebf\u7a0b\u540c\u6b65\uff0c\u6307\u4e00 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,10],"tags":[21,46,47,45],"class_list":{"0":"post-983","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-linux","8":"tag-linux","9":"tag-46","10":"tag-47","11":"tag-45"},"_links":{"self":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/983","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=983"}],"version-history":[{"count":58,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/983\/revisions"}],"predecessor-version":[{"id":1228,"href":"https:\/\/guapicoding.com\/index.php?rest_route=\/wp\/v2\/posts\/983\/revisions\/1228"}],"wp:attachment":[{"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=983"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=983"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/guapicoding.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=983"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
- \u9759\u6001\u521d\u59cb\u5316\uff1a
- \u65e2\u6709\u8bd5\u56fe\u4ee5\u5199\u6a21\u5f0f\u52a0\u9501\u7684\u7ebf\u7a0b\uff0c\u4e5f\u6709\u8bd5\u56fe\u4ee5\u8bfb\u6a21\u5f0f\u52a0\u9501\u7684\u7ebf\u7a0b\uff0c\u90a3\u4e48\u8bfb\u5199\u9501\u4f1a\u963b\u585e\u968f\u540e\u7684\u8bfb\u6a21\u5f0f\u9501\u8bf7\u6c42\uff0c\u4f18\u5148\u6ee1\u8db3\u5199\u6a21\u5f0f\u9501\u3002\u8bfb\u9501\u3001\u5199\u9501\u5e76\u884c\u963b\u585e\u65f6\uff0c\u5199\u9501\u4f18\u5148\u7ea7\u9ad8<\/strong><\/li>\n<\/ul>\n\n\n\n
- \u9759\u6001\u521d\u59cb\u5316\uff1a
![\"\"](\"https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/1729311124155.png\")
<\/div><\/figure>\n<\/div>\n\n\n![\"\"](\"https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/pthread_cond_wait\u51fd\u6570-1024x498-1.png\")
<\/div><\/figure>\n\n\n\n![\"\"](\"https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/\u6761\u4ef6\u53d8\u91cf\u5b9e\u73b0\u7684\u751f\u4ea7\u8005\u6d88\u8d39\u8005-1024x498-1.png\")
<\/div><\/figure>\n\n\n\n![\"\"](\"https:\/\/guapicoding.com\/wp-content\/uploads\/2024\/10\/\u4fe1\u53f7\u91cf.png\")
<\/div><\/figure>\n\n\n\n