{"id":3174,"date":"2012-04-18T16:50:45","date_gmt":"2012-04-18T07:50:45","guid":{"rendered":"http:\/\/umezawa.dyndns.info\/wordpress\/?p=3174"},"modified":"2012-05-24T20:01:21","modified_gmt":"2012-05-24T11:01:21","slug":"posix-%e3%81%ae%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc%e3%83%90%e3%83%ab%e3%82%bf%e3%82%a4%e3%83%9e-timer_create-%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9","status":"publish","type":"post","link":"http:\/\/umezawa.dyndns.info\/wordpress\/?p=3174","title":{"rendered":"POSIX \u306e\u30a4\u30f3\u30bf\u30fc\u30d0\u30eb\u30bf\u30a4\u30de timer_create \u306e\u4f7f\u3044\u65b9"},"content":{"rendered":"<p>POSIX \u74b0\u5883\u3067\u975e\u540c\u671f\u7684\u306a\u30bf\u30a4\u30de\u3092\u4f7f\u3046\u306b\u306f setitimer() \u3092\u4f7f\u3044\u307e\u3059\u304c\u3001\u3053\u308c\u3060\u3068\u30bf\u30a4\u30de\u304c 1 \u500b\u3057\u304b\u4f7f\u3048\u307e\u305b\u3093\u3002\uff08\u6b63\u78ba\u306b\u306f SIGALRM, SIGVALRM, SIGPROF \u3068\u3044\u3046\u6027\u8cea\u306e\u9055\u3046\u30bf\u30a4\u30de\u3092\u305d\u308c\u305e\u308c 1 \u500b\u305a\u3064\uff09<\/p>\n<p>\u3055\u3059\u304c\u306b\u3053\u308c\u3067\u306f\u53b3\u3057\u3044\u3068\u3044\u3046\u3053\u3068\u3067\u3001POSIX.1b \u306b\u306f timer_create() \u3068\u3044\u3046\u95a2\u6570\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u3066\u3001\u3053\u308c\u3060\u3068\u597d\u304d\u306a\u3060\u3051\u30bf\u30a4\u30de\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3055\u3089\u306b\u3001setitimer() \u3068\u9055\u3044\u3001\u30bf\u30a4\u30de\u3054\u3068\u306b\u597d\u304d\u306a\u30b7\u30b0\u30ca\u30eb\u3092\u767a\u751f\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3057\u3001\u30b7\u30b0\u30ca\u30eb\u3092\u767a\u751f\u3055\u305b\u308b\u4ee3\u308f\u308a\u306b\u30b9\u30ec\u30c3\u30c9\u3092\u8d77\u52d5\u3057\u3066\u901a\u77e5\u95a2\u6570\u3092\u547c\u3073\u51fa\u3055\u305b\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><!--more--><\/p>\n<blockquote>\n<pre>#include &lt;inttypes.h&gt;\r\n#include &lt;pthread.h&gt;\r\n#include &lt;signal.h&gt;\r\n#include &lt;stdint.h&gt;\r\n#include &lt;stdio.h&gt;\r\n#include &lt;stdlib.h&gt;\r\n#include &lt;string.h&gt;\r\n#include &lt;unistd.h&gt;\r\n\r\n#if SIZEOF_PTHREAD_T == 4\r\n#define PRI_PTHREAD_T \"08\" PRIx32\r\n#define CASTPRI_PTHREAD_T uint32_t\r\n#elif SIZEOF_PTHREAD_T == 8\r\n#define PRI_PTHREAD_T \"016\" PRIx64\r\n#define CASTPRI_PTHREAD_T uint64_t\r\n#else\r\n#error\r\n#endif\r\n\r\nconst struct itimerspec its_1sec = { .it_value = { 1 } };\r\nconst struct itimerspec its_2sec = { .it_value = { 2 } };\r\nconst struct timespec ts_3sec = { 3 };\r\n\r\nvoid notifyfunc(union sigval sv)\r\n{\r\n\tprintf(\"notifyfunc: timer has expired.\\n\");\r\n\tprintf(\" pthread_self() = %\" PRI_PTHREAD_T \"\\n\",\r\n\t     (CASTPRI_PTHREAD_T)pthread_self());\r\n\tprintf(\" sigval         = %d\\n\", sv.sival_int);\r\n\treturn;\r\n}\r\n\r\nvoid sigalrm(int sig, siginfo_t *si, void *uc)\r\n{\r\n\tprintf(\"sigalrm: timer has expired.\\n\");\r\n\tprintf(\" pthread_self() = %\" PRI_PTHREAD_T \"\\n\",\r\n\t     (CASTPRI_PTHREAD_T)pthread_self());\r\n\tprintf(\" sigval         = %d\\n\", si->si_value.sival_int);\r\n}\r\n\r\nint main(void)\r\n{\r\n\tstruct sigevent se;\r\n\tstruct sigaction sa;\r\n\ttimer_t timerid_thread;\r\n\ttimer_t timerid_signal;\r\n\r\n\tprintf(\"main thread\\n\");\r\n\tprintf(\" pthread_self() = %\" PRI_PTHREAD_T \"\\n\",\r\n\t    (CASTPRI_PTHREAD_T)pthread_self());\r\n\r\n\tmemset(&se, 0, sizeof(se));\r\n\tse.sigev_value.sival_int = 1;\r\n\tse.sigev_notify = SIGEV_THREAD;\r\n\tse.sigev_notify_function = notifyfunc;\r\n\tse.sigev_notify_attributes = NULL;\r\n\ttimer_create(CLOCK_REALTIME, &se, &timerid_thread);\r\n\ttimer_settime(timerid_thread, 0, &its_1sec, NULL);\r\n\r\n\tmemset(&sa, 0, sizeof(sa));\r\n\tsa.sa_sigaction = sigalrm;\r\n\tsigfillset(&sa.sa_mask);\r\n\tsa.sa_flags = SA_SIGINFO;\r\n\tsigaction(SIGALRM, &sa, NULL);\r\n\r\n\tmemset(&se, 0, sizeof(se));\r\n\tse.sigev_value.sival_int = 2;\r\n\tse.sigev_signo = SIGALRM;\r\n\tse.sigev_notify = SIGEV_SIGNAL;\r\n\ttimer_create(CLOCK_REALTIME, &se, &timerid_signal);\r\n\ttimer_settime(timerid_signal, 0, &its_2sec, NULL);\r\n\r\n\tnanosleep(&ts_3sec, NULL);\r\n\r\n\ttimer_delete(timerid_thread);\r\n\ttimer_delete(timerid_signal);\r\n\r\n\treturn 0;\r\n}<\/pre>\n<\/blockquote>\n<p>\u3054\u3081\u3093\u9577\u304b\u3063\u305f\u3002<\/p>\n<p>\u3067\u3001\u3053\u308c\u3092 Linux (CentOS 6, kernel 2.6.32-220.7.1.el6.x86_64) \u3067\u5b9f\u884c\u3059\u308b\u3068\u3001\u305f\u3068\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<blockquote>\n<pre>[umezawa@devlinux:pts\/6 ~]$ .\/timer_test\r\nmain thread\r\n pthread_self() = 00007f8258d8e700\r\nnotifyfunc: timer has expired.                 \u2190 1\u79d2\u5f8c\r\n pthread_self() = 00007f8253fff700\r\n sigval         = 1\r\nsigalrm: timer has expired.                    \u2190 2\u79d2\u5f8c\r\n pthread_self() = 00007f8258d8e700\r\n sigval         = 2\r\n[umezawa@devlinux:pts\/6 ~]$<\/pre>\n<\/blockquote>\n<p>sigev_notify \u304c SIGEV_SIGNAL \u306a\u65b9\u306f\uff08\u30d7\u30ed\u30bb\u30b9\u306b\u30b9\u30ec\u30c3\u30c9\u304c 1 \u3064\u3057\u304b\u306a\u3044\u306e\u3067\uff09\u30e1\u30a4\u30f3\u30b9\u30ec\u30c3\u30c9\u3067\u30b7\u30b0\u30ca\u30eb\u30cf\u30f3\u30c9\u30e9\u304c\u547c\u3073\u51fa\u3055\u308c\u3001SIGEV_THREAD \u306a\u65b9\u306f\u65b0\u3057\u3044\u30b9\u30ec\u30c3\u30c9\u3067\u901a\u77e5\u95a2\u6570\u304c\u547c\u3073\u51fa\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u30bf\u30a4\u30de\u3092\u4f5c\u6210\u3057\u305f\u6642\u306e sigev_value \u304c\u30cf\u30f3\u30c9\u30e9\u306b\u6e21\u3063\u3066\u304a\u308a\u3001\u30cf\u30f3\u30c9\u30e9\u5074\u3067\u30bf\u30a4\u30de\u3092\u8b58\u5225\u3067\u304d\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u3067\u307e\u3042\u3053\u3053\u307e\u3067\u306f\u3044\u3044\u3093\u3067\u3059\u304c\u3001\u4ed6\u306e\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u3067\u306f\u3069\u3046\u304b\u3068\u3044\u3046\u3068\u3001<\/p>\n<dl>\n<dt>\uff0804\/20\u8ffd\u8a18\uff09 FreeBSD 9.0<\/dt>\n<dd>Linux \u3068\u540c\u69d8\u306b\u4f7f\u3048\u308b\u307d\u3044\u3002<\/dd>\n<dt>NetBSD 5<\/dt>\n<dd>SIGEV_THREAD \u306f\u4f7f\u3048\u306a\u3044\u3002timer_create() \u3092\u547c\u3076\u3068\u6210\u529f\u3059\u308b\u304c\u3001\u901a\u77e5\u95a2\u6570\u306f\u547c\u3070\u308c\u306a\u3044\u3002<br \/>\u3064\u3044\u3067\u306b\u8a00\u3046\u3068\u3001\u306a\u305c\u304b sigev_notify_function \u306e\u578b\u304c void (*)(union sigval) \u3067\u306f\u306a\u304f void (*)(union sigval *) \u306b\u306a\u3063\u3066\u3044\u3066\u3001\u4e0a\u306e\u30b3\u30fc\u30c9\u306f\u305d\u306e\u307e\u307e\u3067\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u3067\u304d\u306a\u3044\u3002<\/dd>\n<dt>OpenBSD 5.0<\/dt>\n<dd>\u305d\u3082\u305d\u3082 timer_create() \u304c\u7121\u3044\u3002<a href=\"http:\/\/www.openbsd.org\/cgi-bin\/cvsweb\/src\/lib\/libc\/sys\/timer_create.c?rev=1.6\">libc \u306b\u306f\u30b7\u30f3\u30dc\u30eb\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304c ENOSYS \u3092\u8fd4\u3059\u3060\u3051<\/a>\u3067\u3042\u308a\u3001\u307e\u305f\u30d8\u30c3\u30c0\u30d5\u30a1\u30a4\u30eb\u306b\u306f\u5ba3\u8a00\u304c\u7121\u3044\u3002<\/dd>\n<\/dl>\n<p>\u3068\u3044\u3046\u308f\u3051\u3067\u3061\u3087\u3063\u3068\u4f7f\u3044\u3065\u3089\u3044\u3067\u3059\u306d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>POSIX \u74b0\u5883\u3067\u975e\u540c\u671f\u7684\u306a\u30bf\u30a4\u30de\u3092\u4f7f\u3046\u306b\u306f setitimer() \u3092\u4f7f\u3044\u307e\u3059\u304c\u3001\u3053\u308c\u3060\u3068\u30bf\u30a4\u30de\u304c 1 \u500b\u3057\u304b\u4f7f\u3048\u307e\u305b\u3093\u3002\uff08\u6b63\u78ba\u306b\u306f SIGALRM, SIGVALRM, SIGPROF \u3068\u3044\u3046\u6027\u8cea\u306e\u9055\u3046\u30bf\u30a4\u30de\u3092\u305d\u308c\u305e [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3174","post","type-post","status-publish","format-standard","hentry","category-software"],"_links":{"self":[{"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3174","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3174"}],"version-history":[{"count":12,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3174\/revisions"}],"predecessor-version":[{"id":3217,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/3174\/revisions\/3217"}],"wp:attachment":[{"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3174"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3174"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3174"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}