{"id":118,"date":"2015-03-31T17:32:05","date_gmt":"2015-03-31T17:32:05","guid":{"rendered":""},"modified":"2015-03-31T17:32:05","modified_gmt":"2015-03-31T17:32:05","slug":"","status":"publish","type":"post","link":"http:\/\/weizn.net\/?p=118","title":{"rendered":"Linux\u7ebf\u7a0b\uff1a\u6761\u4ef6\u53d8\u91cf"},"content":{"rendered":"

1.\u521d\u59cb\u5316\u6761\u4ef6\u53d8\u91cfpthread_cond_init
\n#include <pthread.h>
\nint pthread_cond_init(pthread_cond_t *cv,const pthread_condattr_t *cattr);
\n\u8fd4\u56de\u503c\uff1a\u51fd\u6570\u6210\u529f\u8fd4\u56de0\uff1b\u4efb\u4f55\u5176\u4ed6\u8fd4\u56de\u503c\u90fd\u8868\u793a\u9519\u8bef
\n\u521d \u59cb\u5316\u4e00\u4e2a\u6761\u4ef6\u53d8\u91cf\u3002\u5f53\u53c2\u6570cattr\u4e3a\u7a7a\u6307\u9488\u65f6\uff0c\u51fd\u6570\u521b\u5efa\u7684\u662f\u4e00\u4e2a\u7f3a\u7701\u7684\u6761\u4ef6\u53d8\u91cf\u3002\u5426\u5219\u6761\u4ef6\u53d8\u91cf\u7684\u5c5e\u6027\u5c06\u7531cattr\u4e2d\u7684\u5c5e\u6027\u503c\u6765\u51b3\u5b9a\u3002\u8c03\u7528 pthread_cond_init\u51fd\u6570\u65f6\uff0c\u53c2\u6570cattr\u4e3a\u7a7a\u6307\u9488\u7b49\u4ef7\u4e8ecattr\u4e2d\u7684\u5c5e\u6027\u4e3a\u7f3a\u7701\u5c5e\u6027\uff0c\u53ea\u662f\u524d\u8005\u4e0d\u9700\u8981cattr\u6240\u5360\u7528\u7684\u5185\u5b58\u5f00\u9500\u3002\u8fd9 \u4e2a\u51fd\u6570\u8fd4\u56de\u65f6\uff0c\u6761\u4ef6\u53d8\u91cf\u88ab\u5b58\u653e\u5728\u53c2\u6570cv\u6307\u5411\u7684\u5185\u5b58\u4e2d\u3002
\n\u53ef\u4ee5\u7528\u5b8fPTHREAD_COND_INITIALIZER\u6765\u521d\u59cb\u5316\u9759\u6001\u5b9a\u4e49\u7684\u6761\u4ef6\u53d8\u91cf\uff0c\u4f7f\u5176\u5177\u6709\u7f3a\u7701\u5c5e\u6027\u3002\u8fd9\u548c\u7528pthread_cond_init\u51fd\u6570\u52a8\u6001\u5206\u914d\u7684\u6548\u679c\u662f\u4e00\u6837\u7684\u3002\u521d\u59cb\u5316\u65f6\u4e0d\u8fdb\u884c\u9519\u8bef\u68c0\u67e5\u3002\u5982\uff1a
\npthread_cond_t cv = PTHREAD_COND_INITIALIZER;
\n\u4e0d\u80fd\u7531\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u521d\u59cb\u5316\u4e00\u4e2a\u6761\u4ef6\u53d8\u91cf\u3002\u5f53\u9700\u8981\u91cd\u65b0\u521d\u59cb\u5316\u6216\u91ca\u653e\u4e00\u4e2a\u6761\u4ef6\u53d8\u91cf\u65f6\uff0c\u5e94\u7528\u7a0b\u5e8f\u5fc5\u987b\u4fdd\u8bc1\u8fd9\u4e2a\u6761\u4ef6\u53d8\u91cf\u672a\u88ab\u4f7f\u7528\u3002<\/p>\n

2.\u963b\u585e\u5728\u6761\u4ef6\u53d8\u91cf\u4e0apthread_cond_wait
\n#include <pthread.h>
\nint pthread_cond_wait(pthread_cond_t *cv,pthread_mutex_t *mutex);<\/p>\n

\u8fd4\u56de\u503c\uff1a\u51fd\u6570\u6210\u529f\u8fd4\u56de0\uff1b\u4efb\u4f55\u5176\u4ed6\u8fd4\u56de\u503c\u90fd\u8868\u793a\u9519\u8bef
\n\u51fd\u6570\u5c06\u89e3\u9501mutex\u53c2\u6570\u6307\u5411\u7684\u4e92\u65a5\u9501\uff0c\u5e76\u4f7f\u5f53\u524d\u7ebf\u7a0b\u963b\u585e\u5728cv\u53c2\u6570\u6307\u5411\u7684\u6761\u4ef6\u53d8\u91cf\u4e0a\u3002
\n\u88ab\u963b\u585e\u7684\u7ebf\u7a0b\u53ef\u4ee5\u88abpthread_cond_signal\u51fd\u6570\uff0cpthread_cond_broadcast\u51fd\u6570\u5524\u9192\uff0c\u4e5f\u53ef\u80fd\u5728\u88ab\u4fe1\u53f7\u4e2d\u65ad\u540e\u88ab\u5524\u9192\u3002
\npthread_cond_wait\u51fd\u6570\u7684\u8fd4\u56de\u5e76\u4e0d\u610f\u5473\u7740\u6761\u4ef6\u7684\u503c\u4e00\u5b9a\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u5fc5\u987b\u91cd\u65b0\u68c0\u67e5\u6761\u4ef6\u7684\u503c\u3002
\npthread_cond_wait\u51fd\u6570\u8fd4\u56de\u65f6\uff0c\u76f8\u5e94\u7684\u4e92\u65a5\u9501\u5c06\u88ab\u5f53\u524d\u7ebf\u7a0b\u9501\u5b9a\uff0c\u5373\u4f7f\u662f\u51fd\u6570\u51fa\u9519\u8fd4\u56de\u3002
\n\u4e00\u822c\u4e00\u4e2a\u6761\u4ef6\u8868\u8fbe\u5f0f\u90fd\u662f\u5728\u4e00\u4e2a\u4e92\u65a5\u9501\u7684\u4fdd\u62a4\u4e0b\u88ab\u68c0\u67e5\u3002\u5f53\u6761\u4ef6\u8868\u8fbe\u5f0f\u672a\u88ab\u6ee1\u8db3\u65f6\uff0c\u7ebf\u7a0b\u5c06\u4ecd\u7136\u963b\u585e\u5728\u8fd9\u4e2a\u6761\u4ef6\u53d8\u91cf\u4e0a\u3002\u5f53\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u6539\u53d8\u4e86\u6761\u4ef6\u7684\u503c\u5e76\u5411\u6761\u4ef6\u53d8\u91cf\u53d1\u51fa\u4fe1\u53f7\u65f6\uff0c\u7b49\u5f85\u5728\u8fd9\u4e2a\u6761\u4ef6\u53d8\u91cf\u4e0a\u7684\u4e00\u4e2a\u7ebf\u7a0b\u6216\u6240\u6709\u7ebf\u7a0b\u88ab\u5524\u9192\uff0c\u63a5\u7740\u90fd\u8bd5\u56fe\u518d\u6b21\u5360\u6709\u76f8\u5e94\u7684\u4e92\u65a5\u9501\u3002
\n\u963b\u585e\u5728\u6761\u4ef6\u53d8\u91cf\u4e0a\u7684\u7ebf\u7a0b\u88ab\u5524\u9192\u4ee5\u540e\uff0c\u76f4\u5230pthread_cond_wait()\u51fd\u6570\u8fd4\u56de\u4e4b\u524d\u6761\u4ef6\u7684\u503c\u90fd\u6709\u53ef\u80fd\u53d1\u751f\u53d8\u5316\u3002\u6240\u4ee5\u51fd\u6570\u8fd4\u56de\u4ee5\u540e\uff0c\u5728\u9501\u5b9a\u76f8\u5e94\u7684\u4e92 \u65a5\u9501\u4e4b\u524d\uff0c\u5fc5\u987b\u91cd\u65b0\u6d4b\u8bd5\u6761\u4ef6\u503c\u3002\u6700\u597d\u7684\u6d4b\u8bd5\u65b9\u6cd5\u662f\u5faa\u73af\u8c03\u7528pthread_cond_wait\u51fd\u6570\uff0c\u5e76\u628a\u6ee1\u8db3\u6761\u4ef6\u7684\u8868\u8fbe\u5f0f\u7f6e\u4e3a\u5faa\u73af\u7684\u7ec8\u6b62\u6761\u4ef6\u3002\u5982\uff1a<\/p>\n

pthread_mutex_lock();
\nwhile (condition_is_false)
\npthread_cond_wait();
\npthread_mutex_unlock();<\/p>\n

\u963b\u585e\u5728\u540c\u4e00\u4e2a\u6761\u4ef6\u53d8\u91cf\u4e0a\u7684\u4e0d\u540c\u7ebf\u7a0b\u88ab\u91ca\u653e\u7684\u6b21\u5e8f\u662f\u4e0d\u4e00\u5b9a\u7684\u3002
\n\u6ce8\u610f\uff1apthread_cond_wait()\u51fd\u6570\u662f\u9000\u51fa\u70b9\uff0c\u5982\u679c\u5728\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u65f6\uff0c\u5df2\u6709\u4e00\u4e2a\u6302\u8d77\u7684\u9000\u51fa\u8bf7\u6c42\uff0c\u4e14\u7ebf\u7a0b\u5141\u8bb8\u9000\u51fa\uff0c\u8fd9\u4e2a\u7ebf\u7a0b\u5c06\u88ab\u7ec8\u6b62\u5e76\u5f00\u59cb\u6267\u884c\u5584\u540e\u5904\u7406\u51fd\u6570\uff0c\u800c\u8fd9\u65f6\u548c\u6761\u4ef6\u53d8\u91cf\u76f8\u5173\u7684\u4e92\u65a5\u9501\u4ecd\u5c06\u5904\u5728\u9501\u5b9a\u72b6\u6001\u3002
\n 
\n3.\u89e3\u9664\u5728\u6761\u4ef6\u53d8\u91cf\u4e0a\u7684\u963b\u585epthread_cond_signal
\n#include <pthread.h>
\nint pthread_cond_signal(pthread_cond_t *cv);<\/p>\n

\u8fd4\u56de\u503c\uff1a\u51fd\u6570\u6210\u529f\u8fd4\u56de0\uff1b\u4efb\u4f55\u5176\u4ed6\u8fd4\u56de\u503c\u90fd\u8868\u793a\u9519\u8bef
\n\u51fd\u6570\u88ab\u7528\u6765\u91ca\u653e\u88ab\u963b\u585e\u5728\u6307\u5b9a\u6761\u4ef6\u53d8\u91cf\u4e0a\u7684\u4e00\u4e2a\u7ebf\u7a0b\u3002
\n\u5fc5\u987b\u5728\u4e92\u65a5\u9501\u7684\u4fdd\u62a4\u4e0b\u4f7f\u7528\u76f8\u5e94\u7684\u6761\u4ef6\u53d8\u91cf\u3002\u5426\u5219\u5bf9\u6761\u4ef6\u53d8\u91cf\u7684\u89e3\u9501\u6709\u53ef\u80fd\u53d1\u751f\u5728\u9501\u5b9a\u6761\u4ef6\u53d8\u91cf\u4e4b\u524d\uff0c\u4ece\u800c\u9020\u6210\u6b7b\u9501\u3002
\n\u5524\u9192\u963b\u585e\u5728\u6761\u4ef6\u53d8\u91cf\u4e0a\u7684\u6240\u6709\u7ebf\u7a0b\u7684\u987a\u5e8f\u7531\u8c03\u5ea6\u7b56\u7565\u51b3\u5b9a\uff0c\u5982\u679c\u7ebf\u7a0b\u7684\u8c03\u5ea6\u7b56\u7565\u662fSCHED_OTHER\u7c7b\u578b\u7684\uff0c\u7cfb\u7edf\u5c06\u6839\u636e\u7ebf\u7a0b\u7684\u4f18\u5148\u7ea7\u5524\u9192\u7ebf\u7a0b\u3002
\n\u5982\u679c\u6ca1\u6709\u7ebf\u7a0b\u88ab\u963b\u585e\u5728\u6761\u4ef6\u53d8\u91cf\u4e0a\uff0c\u90a3\u4e48\u8c03\u7528pthread_cond_signal()\u5c06\u6ca1\u6709\u4f5c\u7528\u3002<\/p>\n

 <\/p>\n

4.\u963b\u585e\u76f4\u5230\u6307\u5b9a\u65f6\u95f4pthread_cond_timedwait
\n#include <pthread.h>
\n#include <time.h>
\nint pthread_cond_timedwait(pthread_cond_t *cv,pthread_mutex_t *mp, const structtimespec * abstime);<\/p>\n

\u8fd4\u56de\u503c\uff1a\u51fd\u6570\u6210\u529f\u8fd4\u56de0\uff1b\u4efb\u4f55\u5176\u4ed6\u8fd4\u56de\u503c\u90fd\u8868\u793a\u9519\u8bef
\n\u51fd\u6570\u5230\u4e86\u4e00\u5b9a\u7684\u65f6\u95f4\uff0c\u5373\u4f7f\u6761\u4ef6\u672a\u53d1\u751f\u4e5f\u4f1a\u89e3\u9664\u963b\u585e\u3002\u8fd9\u4e2a\u65f6\u95f4\u7531\u53c2\u6570abstime\u6307\u5b9a\u3002\u51fd\u6570\u8fd4\u56de\u65f6\uff0c\u76f8\u5e94\u7684\u4e92\u65a5\u9501\u5f80\u5f80\u662f\u9501\u5b9a\u7684\uff0c\u5373\u4f7f\u662f\u51fd\u6570\u51fa\u9519\u8fd4\u56de\u3002
\n\u6ce8\u610f\uff1apthread_cond_timedwait\u51fd\u6570\u4e5f\u662f\u9000\u51fa\u70b9\u3002
\n\u8d85\u65f6\u65f6\u95f4\u53c2\u6570\u662f\u6307\u4e00\u5929\u4e2d\u7684\u67d0\u4e2a\u65f6\u523b\u3002\u4f7f\u7528\u4e3e\u4f8b\uff1a
\npthread_timestruc_t to;
\nto.tv_sec = time(NULL) + TIMEOUT;
\nto.tv_nsec = 0;
\n\u8d85\u65f6\u8fd4\u56de\u7684\u9519\u8bef\u7801\u662fETIMEDOUT\u3002<\/p>\n

5.\u91ca\u653e\u963b\u585e\u7684\u6240\u6709\u7ebf\u7a0bpthread_cond_broadcast
\n#include <pthread.h>
\nint pthread_cond_broadcast(pthread_cond_t *cv);<\/p>\n

\u8fd4\u56de\u503c\uff1a\u51fd\u6570\u6210\u529f\u8fd4\u56de0\uff1b\u4efb\u4f55\u5176\u4ed6\u8fd4\u56de\u503c\u90fd\u8868\u793a\u9519\u8bef
\n\u51fd\u6570\u5524\u9192\u6240\u6709\u88abpthread_cond_wait\u51fd\u6570\u963b\u585e\u5728\u67d0\u4e2a\u6761\u4ef6\u53d8\u91cf\u4e0a\u7684\u7ebf\u7a0b\uff0c\u53c2\u6570cv\u88ab\u7528\u6765\u6307\u5b9a\u8fd9\u4e2a\u6761\u4ef6\u53d8\u91cf\u3002\u5f53\u6ca1\u6709\u7ebf\u7a0b\u963b\u585e\u5728\u8fd9\u4e2a\u6761\u4ef6\u53d8\u91cf\u4e0a\u65f6\uff0cpthread_cond_broadcast\u51fd\u6570\u65e0\u6548\u3002
\n\u7531\u4e8epthread_cond_broadcast\u51fd\u6570\u5524\u9192\u6240\u6709\u963b\u585e\u5728\u67d0\u4e2a\u6761\u4ef6\u53d8\u91cf\u4e0a\u7684\u7ebf\u7a0b\uff0c\u8fd9\u4e9b\u7ebf\u7a0b\u88ab\u5524\u9192\u540e\u5c06\u518d\u6b21\u7ade\u4e89\u76f8\u5e94\u7684\u4e92\u65a5\u9501\uff0c\u6240\u4ee5\u5fc5\u987b\u5c0f\u5fc3\u4f7f\u7528pthread_cond_broadcast\u51fd\u6570\u3002<\/p>\n

6.\u91ca\u653e\u6761\u4ef6\u53d8\u91cfpthread_cond_destroy
\n#include <pthread.h>
\nint pthread_cond_destroy(pthread_cond_t *cv);<\/p>\n

\u8fd4\u56de\u503c\uff1a\u51fd\u6570\u6210\u529f\u8fd4\u56de0\uff1b\u4efb\u4f55\u5176\u4ed6\u8fd4\u56de\u503c\u90fd\u8868\u793a\u9519\u8bef
\n\u6ce8\u610f\uff1a\u6761\u4ef6\u53d8\u91cf\u5360\u7528\u7684\u7a7a\u95f4\u5e76\u672a\u88ab\u91ca\u653e\u3002<\/p>\n

7.\u5524\u9192\u4e22\u5931\u95ee\u9898
\n\u5728\u7ebf\u7a0b\u672a\u83b7\u5f97\u76f8\u5e94\u7684\u4e92\u65a5\u9501\u65f6\u8c03\u7528pthread_cond_signal\u6216pthread_cond_broadcast\u51fd\u6570\u53ef\u80fd\u4f1a\u5f15\u8d77\u5524\u9192\u4e22\u5931\u95ee\u9898\u3002
\n\u5524\u9192\u4e22\u5931\u5f80\u5f80\u4f1a\u5728\u4e0b\u9762\u7684\u60c5\u51b5\u4e0b\u53d1\u751f\uff1a
\n    \u4e00\u4e2a\u7ebf\u7a0b\u8c03\u7528pthread_cond_signal\u6216pthread_cond_broadcast\u51fd\u6570\uff1b
\n    \u53e6\u4e00\u4e2a\u7ebf\u7a0b\u6b63\u5904\u5728\u6d4b\u8bd5\u6761\u4ef6\u53d8\u91cf\u548c\u8c03\u7528pthread_cond_wait\u51fd\u6570\u4e4b\u95f4\uff1b<\/p>\n

\n\t    \u6ca1\u6709\u7ebf\u7a0b\u6b63\u5728\u5904\u5728\u963b\u585e\u7b49\u5f85\u7684\u72b6\u6001\u4e0b\u3002\n<\/p>\n

\n\t\n<\/p>\n

\n\t\u6d4b\u8bd5\u4ee3\u7801\uff1a\n<\/p>\n

\n\t \n<\/p>\n

\n\t#include <stdio.h>
\n#include <stdlib.h>
\n#include <unistd.h>
\n#include <pthread.h>\n<\/p>\n

\n\tpthread_cond_t cond;
\npthread_mutex_t mutex;\n<\/p>\n

\n\tint pthread_init()
\n{
\n    pthread_mutex_init(&mutex,NULL);
\n    pthread_cond_init(&cond,NULL);\n<\/p>\n

\n\t    return 0;
\n}\n<\/p>\n

\n\tvoid *new_thread(void *Parameter)
\n{
\n    int n;
\n    int num=*(int *)Parameter;\n<\/p>\n

\n\t    while(1)
\n    {
\n        pthread_mutex_lock(&mutex);
\n        \/\/\u8fdb\u5165\u6761\u4ef6\u53d8\u91cf\u65f6\u963b\u585e\u7ebf\u7a0b\uff0c\u91ca\u653e\u4e92\u65a5\u9501
\n        pthread_cond_wait(&cond,&mutex);
\n        \/\/\u79bb\u5f00\u6761\u4ef6\u53d8\u91cf\u65f6\u83b7\u53d6\u4e92\u65a5\u9501
\n        pthread_mutex_unlock(&mutex);\n<\/p>\n

\n\t        for(n=0;n<10;n++)
\n        {
\n            printf(“I’m %d.\\n”,num);
\n            sleep(1);
\n        }
\n    }\n<\/p>\n

\n\t    return NULL;
\n}\n<\/p>\n

\n\tint start_thread()
\n{
\n    pthread_mutex_lock(&mutex);
\n    \/\/\u91ca\u653e\u4e00\u4e2a\u6761\u4ef6\u53d8\u91cf
\n    pthread_cond_signal(&cond);
\n    pthread_mutex_unlock(&mutex);
\n    return 0;
\n}\n<\/p>\n

\n\tint main()
\n{
\n    int n;
\n    pthread_t threadID;
\n    char ch;\n<\/p>\n

\n\t    pthread_init();
\n    for(n=0;n<10;n++)
\n    {
\n        pthread_create(&threadID,NULL,new_thread,(void *)&n);
\n        usleep(1000);
\n    }
\n    while(1)
\n    {
\n        fflush(stdin);
\n        scanf(“%c”,&ch);
\n        switch(ch)
\n        {
\n        case ‘r’:
\n            start_thread();
\n            break;
\n        case ‘a’:
\n            pthread_mutex_lock(&mutex);
\n            \/\/\u91ca\u653e\u6240\u6709\u7684\u6761\u4ef6\u53d8\u91cf
\n            pthread_cond_broadcast(&cond);
\n            pthread_mutex_unlock(&mutex);
\n            break;
\n        }
\n    }\n<\/p>\n

\n\t    return 0;
\n}\n<\/p>\n

\n\t \n<\/p>\n

\n\t \n<\/p>\n

\n\t \n<\/p>\n

\n\t \n<\/p>\n

\n\t <\/p>\n","protected":false},"excerpt":{"rendered":"

1.\u521d\u59cb\u5316\u6761\u4ef6\u53d8\u91cfpthread_cond_init<\/p>\n

#include <pthread.h><\/p>\n

int pthread_cond_init(pthread_cond_t *cv,<\/p>\n

const pthread_condattr_t *cattr);<\/p>\n

\u8fd4\u56de\u503c\uff1a\u51fd\u6570\u6210\u529f\u8fd4\u56de0\uff1b\u4efb\u4f55\u5176\u4ed6\u8fd4\u56de\u503c\u90fd\u8868\u793a\u9519\u8bef<\/p>\n

\u521d \u59cb\u5316\u4e00\u4e2a\u6761\u4ef6\u53d8\u91cf\u3002\u5f53\u53c2\u6570cattr\u4e3a\u7a7a\u6307\u9488\u65f6\uff0c\u51fd\u6570\u521b\u5efa\u7684\u662f\u4e00\u4e2a\u7f3a\u7701\u7684\u6761\u4ef6\u53d8\u91cf…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[332],"tags":[],"class_list":["post-118","post","type-post","status-publish","format-standard","hentry"],"yoast_head":"\nLinux\u7ebf\u7a0b\uff1a\u6761\u4ef6\u53d8\u91cf - Wayne's Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/weizn.net\/?p=118\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Linux\u7ebf\u7a0b\uff1a\u6761\u4ef6\u53d8\u91cf - Wayne's Blog\" \/>\n<meta property=\"og:description\" content=\"1.\u521d\u59cb\u5316\u6761\u4ef6\u53d8\u91cfpthread_cond_init #include <pthread.h> int pthread_cond_init(pthread_cond_t *cv, const pthread_condattr_t *cattr); 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