linux\u30ab\u30fc\u30cd\u30eb2.6.22\u304b\u3089eventfd\u3068\u3044\u3046\u3001
\n\u30d5\u30a1\u30a4\u30ebI\/O\u3067\u30a4\u30d9\u30f3\u30c8\u3092\u3084\u308a\u3068\u308a\u3067\u304d\u308b\u4ed5\u7d44\u307f\u304c\u7d44\u307f\u8fbc\u307e\u308c\u307e\u3057\u305f\u3002
\neventfd\u306e\u8003\u3048\u65b9\u304c\u3001\u79c1\u306e\u8a2d\u8a08\u3068\u8fd1\u3044\u3082\u306e\u304c\u3042\u3063\u305f\u306e\u3067\u3001
\n\u3055\u3063\u305d\u304f\u4f7f\u3063\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n
\u611f\u60f3\u3068\u3057\u3066\u306f\u3001Windows\u306e\u540c\u671f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u3088\u3046\u306a\u4f7f\u3044\u65b9\u306b\u5fdc\u7528\u3067\u304d\u308b\u306e\u3067\u3001
\n\u8a2d\u8a08\u306e\u5e45\u304c\u5e83\u304c\u308b\u304b\u306a\u3001\u3068\u3044\u3046\u611f\u3058\u3002
\n\u6027\u80fd\u7684\u306b\u306f\u3061\u3083\u3093\u3068\u8abf\u3079\u3066\u3044\u306a\u3044\u306e\u3067\u3088\u304f\u308f\u304b\u308a\u307e\u305b\u3093\u304c\u3001
\n\u7279\u5225\u91cd\u304f\u306a\u3063\u305f\u3068\u304b\u53cd\u5fdc\u304c\u920d\u3044\u3068\u304b\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n
\u30b5\u30f3\u30d7\u30eb\u3092\u63b2\u8f09\u3057\u307e\u3059\u3002\uff08\u30a8\u30e9\u30fc\u51e6\u7406\u306f\u3044\u3044\u304b\u3052\u3093\u3067\u3059\u3002\u3002\uff09
\n
\n\u52d5\u4f5c\u74b0\u5883\u306f\u3001VMWare\u4e0a\u306eUbuntu7.10\u30928\u306b\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3057\u305f\u3082\u306e\u3002
\nlinux kernel 2.6.24-19
\ngcc version 4.2.3
\nglibc 2.7-1
\n\u3067\u3059\u3002<\/p>\n
glibc 2.8\u304b\u3089\u6b63\u5f0f\u306beventfd\u304c\u4f7f\u3048\u308b\u307f\u305f\u3044\u3067\u3059\u304c\u3001
\n\u30ab\u30fc\u30cd\u30eb\u306b\u306f\u5165\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u5ba3\u8a00\u3092\u3057\u3066\u3057\u307e\u3048\u3070
\n\u666e\u901a\u306b\u547c\u3079\u307e\u3057\u305f\u3002<\/p>\n
\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\uff13\u3064\u306e\u30d5\u30a1\u30a4\u30eb\u3059\u3079\u3066\u304b\u3089”q”\u304c\u8aad\u307f\u8fbc\u3081\u305f\u3089\u7d42\u4e86\u3059\u308b\u3001
\n\u3068\u3044\u3046eventfd\u306e\u7279\u5fb4\u3092\u751f\u304b\u3057\u304d\u308c\u3066\u3044\u306a\u3044\u3082\u306e\u3067\u3059\u304c\u3001\u3054\u52d8\u5f01\u3092\u3002<\/p>\n
\u4f7f\u3044\u65b9\uff09
\nmkfifo\u3067\u3001\u540d\u524d\u4ed8\u304d\u30d1\u30a4\u30d7\u3092\uff13\u3064\u4f5c\u308b\u3002
\n$ mkfifo test1 test2 test3<\/p>\n
\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3002
\n$ .\/myeventfd test1 test2 test3<\/p>\n
\u5225\u306e\u30bf\u30fc\u30df\u30ca\u30eb\u304b\u3089\u5404\u30d1\u30a4\u30d7\u306b\u6587\u5b57\u5217\u3092\u5165\u308c\u308b\u3002
\n$ echo abc > test1
\n$ echo def > test2
\n$ echo ghi > test3
\n$ echo q > test1
\n$ echo q > test2
\n$ echo q > test3<\/p>\n
\u203b”q”\u304c\u542b\u307e\u308c\u308b\u3068\u5404\u30d1\u30a4\u30d7\u306e\u8aad\u307f\u8fbc\u307f\u304c\u7d42\u4e86\u3002
\n\u203b\u3059\u3079\u3066\u306e\u30d1\u30a4\u30d7\u306e\u8aad\u307f\u8fbc\u307f\u304c\u7d42\u4e86\u3059\u308b\u3068\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u7d42\u4e86\u3002<\/p>\n
\u30b3\u30f3\u30d1\u30a4\u30eb\u65b9\u6cd5\uff09
\nmake myeventfd “LDFLAGS=-lpthread”<\/p>\n
\u30bd\u30fc\u30b9\uff09
\n\u81f4\u547d\u7684\u306a\u30d0\u30b0\u306a\u3069\u304c\u3042\u308c\u3070\u30b3\u30e1\u30f3\u30c8\u3044\u305f\u3060\u304d\u305f\u3044\u3067\u3059\u304c\u3001
\n\u4e0d\u5177\u5408\u3067\u306a\u306b\u304b\u30c8\u30e9\u30d6\u30eb\u304c\u3042\u3063\u3066\u3082\u8cac\u4efb\u306f\u8ca0\u3048\u307e\u305b\u3093\u306e\u3067\u3001\u3054\u4e86\u627f\u304f\u3060\u3055\u3044\u3002<\/p>\n
myeventfd.c<\/p>\n
\r\n\/*\r\n Copyright (C) 2008 bitmeister all right reserved.\r\n*\/\r\n\r\n#include <stdio.h>\r\n#include <unistd.h>\r\n#include <stdlib.h>\r\n#include <string.h>\r\n#include <malloc.h>\r\n#include <errno.h>\r\n#include <pthread.h>\r\n#include <sys\/select.h>\r\n#include <sys\/types.h>\r\n#include <sys\/stat.h>\r\n#include <fcntl.h>\r\n\r\n\/* definition evetnfd functions *\/\r\n\/* gcc version 4.2.3 (eventfd.h is not supported) *\/\r\nint eventfd(unsigned int, int);\r\ntypedef u_int64_t eventfd_t;\r\nint eventfd_read(int fd, eventfd_t *value);\r\nint eventfd_write(int fd, eventfd_t value);\r\n\r\nstatic eventfd_t myEventFd=0;\r\n\r\n\/* thread function *\/\r\nvoid *thread_func(void *param)\r\n{\r\n char *filename = (char *)param;\r\n int fd;\r\n fd_set rfds;\r\n int ret;\r\n\r\n fd = open(filename,O_RDONLY);\r\n if( fd == -1 ) {\r\n perror(\"open\");\r\n exit(-1);\r\n }\r\n\r\n while(1) {\r\n FD_ZERO(&rfds);\r\n FD_SET(fd,&rfds);\r\n ret = select( fd+1,&rfds,NULL,NULL,NULL );\r\n if( ret > 0 ) {\r\n if( FD_ISSET(fd,&rfds) ) {\r\n char buffer[256];\r\n ret = read(fd,buffer,sizeof(buffer));\r\n if( ret < 0 ) {\r\n perror(\"read\");\r\n break;\r\n }\r\n else if( ret == 0 ) {\r\n close(fd);\r\n fd = open(filename,O_RDONLY);\r\n if( fd == -1 ) {\r\n perror(\"open\");\r\n exit(-1);\r\n }\r\n continue;\r\n }\r\n printf(\"%s\",buffer);\r\n fflush(stdout);\r\n if( strchr(buffer,'q') != NULL ) {\r\n printf(\"read 'q'\\n\");\r\n break;\r\n }\r\n }\r\n }\r\n else {\r\n perror(\"select\");\r\n break;\r\n }\r\n }\r\n eventfd_write(myEventFd,1);\r\n close(fd);\r\n return NULL;\r\n}\r\n\r\nint main(int argc, char *argv[])\r\n{\r\n pthread_t myThreads[3];\r\n char *fileNames[3];\r\n int i;\r\n fd_set rfds;\r\n int ret;\r\n u_int64_t count = 0;\r\n\r\n if( argc != 4 ) {\r\n fprintf(stderr,\"Usage:%s filename filename filename\\n\",argv[0]);\r\n return 0;\r\n }\r\n myEventFd = eventfd(0,0);\r\n\r\n for(i=0;i<3;i++) {\r\n fileNames[i] = malloc(sizeof(char)*strlen(argv[i+1])+1); \r\n strcpy(fileNames[i],argv[i+1]);\r\n pthread_create(&myThreads[i],NULL,thread_func,fileNames[i]);\r\n }\r\n\r\n while(count < 3) {\r\n FD_ZERO(&rfds);\r\n FD_SET(myEventFd,&rfds);\r\n ret = select(myEventFd+1,&rfds,NULL,NULL,NULL);\r\n if( FD_ISSET(myEventFd,&rfds) ) {\r\n u_int64_t value;\r\n eventfd_read(myEventFd,&value);\r\n printf(\"eventfd_read value=%lld\\n\",value);\r\n count += value;\r\n }\r\n }\r\n for(i=0;i<3;i++) {\r\n pthread_join(myThreads[i],NULL);\r\n free(fileNames[i]);\r\n }\r\n close(myEventFd);\r\n return 0;\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"linux\u30ab\u30fc\u30cd\u30eb2.6.22\u304b\u3089eventfd\u3068\u3044\u3046\u3001 \u30d5\u30a1\u30a4\u30ebI\/O\u3067\u30a4\u30d9\u30f3\u30c8\u3092\u3084\u308a\u3068\u308a\u3067\u304d\u308b\u4ed5\u7d44\u307f\u304c\u7d44\u307f\u8fbc\u307e\u308c\u307e\u3057\u305f\u3002 eventfd\u306e\u8003\u3048\u65b9\u304c\u3001\u79c1\u306e\u8a2d\u8a08\u3068\u8fd1\u3044\u3082\u306e\u304c\u3042\u3063\u305f\u306e\u3067\u3001 \u3055\u3063\u305d\u304f\u4f7f\u3063\u3066\u307f\u307e\u3057\u305f\u3002 \u611f\u60f3\u3068\u3057 […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[18],"class_list":["post-277","post","type-post","status-publish","format-standard","hentry","category-tech","tag-linux"],"_links":{"self":[{"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=\/wp\/v2\/posts\/277","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=277"}],"version-history":[{"count":6,"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=\/wp\/v2\/posts\/277\/revisions"}],"predecessor-version":[{"id":283,"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=\/wp\/v2\/posts\/277\/revisions\/283"}],"wp:attachment":[{"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=277"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=277"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.bitmeister.jp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=277"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}