{"id":458,"date":"2026-05-06T09:08:44","date_gmt":"2026-05-06T00:08:44","guid":{"rendered":"https:\/\/www.zeronana.net\/?p=458"},"modified":"2026-05-06T15:42:01","modified_gmt":"2026-05-06T06:42:01","slug":"%e3%80%90%e5%ae%9f%e5%8b%99%e5%90%91%e3%81%91%e3%80%91go-select%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%ef%bd%9c%e4%b8%a6%e8%a1%8c%e5%87%a6%e7%90%86%e3%82%92%e5%88%b6%e5%be%a1%e3%81%99%e3%82%8b%e5%bf%9c","status":"publish","type":"post","link":"https:\/\/www.zeronana.net\/?p=458","title":{"rendered":"\u3010\u5b9f\u52d9\u5411\u3051\u3011Go select\u306e\u4f7f\u3044\u65b9\uff5c\u4e26\u884c\u51e6\u7406\u3092\u5236\u5fa1\u3059\u308b\u5fdc\u7528\u30c6\u30af\u30cb\u30c3\u30af"},"content":{"rendered":"\n

Go\u8a00\u8a9e\u306e\u4e26\u884c\u51e6\u7406\u3067\u306f\u3001goroutine<\/code>\u3068channel<\/code>\u304c\u4e2d\u5fc3\u306b\u306a\u308a\u307e\u3059\u3002
\u305d\u306e\u4e2d\u3067\u8907\u6570\u306e\u51e6\u7406\u3092\u5236\u5fa1\u3059\u308b\u91cd\u8981\u6a5f\u80fd<\/strong>\u304c select<\/code> \u3067\u3059\u3002<\/p>\n\n\n\n

\u672c\u8a18\u4e8b\u3067\u306f\u3001Go\u306eselect\u306b\u3064\u3044\u3066\u300c\u4f7f\u3044\u65b9\u30fb\u5b9f\u884c\u30bf\u30a4\u30df\u30f3\u30b0\u30fb\u5fdc\u7528\u300d\u3092\u5b9f\u52d9\u8996\u70b9\u3067\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\n\n\n\n

select\u3068\u306f\uff1f<\/h2>\n\n\n\n

select<\/code>\u306f\u3001\u8907\u6570\u306echannel\u306e\u9001\u53d7\u4fe1\u3092\u540c\u6642\u306b\u5f85\u3061\u3001\u6e96\u5099\u3067\u304d\u305f\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u69cb\u6587<\/strong>\u3067\u3059\u3002<\/p>\n\n\n\n

\n\n\n\n

\u57fa\u672c\u69cb\u6587<\/h2>\n\n\n\n
select {
case msg := <-ch1:
    fmt.Println(msg)
case msg := <-ch2:
    fmt.Println(msg)
}<\/code><\/pre>\n\n\n\n
\ud83d\udc49 \u6700\u521d\u306b\u53d7\u4fe1\u3067\u304d\u305fcase\u304c\u5b9f\u884c\u3055\u308c\u308b<\/p>\n\n\n\n
\n\n\n\n
\u5b9f\u52d9\u3067\u306e\u4f7f\u3044\u65b9\u2460\uff1a\u8907\u6570\u51e6\u7406\u306e\u5f85\u6a5f<\/h2>\n\n\n\n
select {
case res := <-api1:
    fmt.Println(\"API1:\", res)
case res := <-api2:
    fmt.Println(\"API2:\", res)
}<\/code><\/pre>\n\n\n\n
\ud83d\udc49 \u8907\u6570\u306e\u975e\u540c\u671f\u51e6\u7406\u3092\u540c\u6642\u306b\u6271\u3048\u308b<\/p>\n\n\n\n
\n\n\n\n
\u5b9f\u52d9\u3067\u306e\u4f7f\u3044\u65b9\u2461\uff1a\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u51e6\u7406<\/h2>\n\n\n\n
select {
case res := <-ch:
    fmt.Println(res)
case <-time.After(2 * time.Second):
    fmt.Println(\"\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\")
}<\/code><\/pre>\n\n\n\n
\ud83d\udc49 API\u901a\u4fe1\u30fb\u5916\u90e8\u51e6\u7406\u3067\u5fc5\u9808<\/p>\n\n\n\n
\n\n\n\n
\u5b9f\u52d9\u3067\u306e\u4f7f\u3044\u65b9\u2462\uff1adefault\uff08\u975e\u30d6\u30ed\u30c3\u30af\uff09<\/h2>\n\n\n\n
select {
case msg := <-ch:
    fmt.Println(msg)
default:
    fmt.Println(\"\u30c7\u30fc\u30bf\u306a\u3057\")
}<\/code><\/pre>\n\n\n\n
\ud83d\udc49 \u51e6\u7406\u3092\u6b62\u3081\u306a\u3044\u8a2d\u8a08\u304c\u3067\u304d\u308b<\/p>\n\n\n\n
\n\n\n\n
\u5fdc\u7528\uff1a\u7121\u9650\u30eb\u30fc\u30d7\uff0bselect<\/h2>\n\n\n\n
for {
    select {
    case msg := <-ch:
        fmt.Println(msg)
    }
}<\/code><\/pre>\n\n\n\n
\ud83d\udc49 \u5e38\u99d0\u51e6\u7406\uff08\u30b5\u30fc\u30d0\u30fc\u30fb\u76e3\u8996\uff09\u3067\u4f7f\u7528<\/p>\n\n\n\n
\n\n\n\n
\u3088\u304f\u3042\u308b\u30df\u30b9<\/h2>\n\n\n\n
\u274c \u30c7\u30c3\u30c9\u30ed\u30c3\u30af
\u274c channel\u672a\u521d\u671f\u5316
\u274c select\u4f7f\u3044\u3059\u304e<\/p>\n\n\n\n
\n\n\n\n
\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n\n\n\n
    \n
  • timeout\u306f\u5fc5\u305a\u5165\u308c\u308b<\/li>\n\n\n\n
  • default\u306f\u614e\u91cd\u306b\u4f7f\u3046<\/li>\n\n\n\n
  • channel\u8a2d\u8a08\u304c\u6700\u91cd\u8981<\/li>\n<\/ul>\n\n\n\n
    \n\n\n\n
    \ud83d\udca1 \u7d50\u8ad6<\/h2>\n\n\n\n
    \ud83d\udc49
    \u300cselect\uff1d\u4e26\u884c\u51e6\u7406\u306e\u5236\u5fa1\u88c5\u7f6e\u300d<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"
    Go\u8a00\u8a9e\u306e\u4e26\u884c\u51e6\u7406\u3067\u306f\u3001goroutine\u3068channel\u304c\u4e2d\u5fc3\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u4e2d\u3067\u8907\u6570\u306e\u51e6\u7406\u3092\u5236\u5fa1\u3059\u308b\u91cd\u8981\u6a5f\u80fd\u304c select \u3067\u3059\u3002 \u672c […]<\/p>\n","protected":false},"author":1,"featured_media":459,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"Go\u8a00\u8a9e\u306eselect\u306e\u4f7f\u3044\u65b9\u3092\u521d\u5fc3\u8005\u5411\u3051\u306b\u89e3\u8aac\u3002\u8907\u6570channel\u306e\u5236\u5fa1\u3001\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u51e6\u7406\u3001\u975e\u540c\u671f\u51e6\u7406\u306a\u3069\u5b9f\u52d9\u3067\u4f7f\u3048\u308b\u5fdc\u7528\u30c6\u30af\u30cb\u30c3\u30af\u3092\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u4ed8\u304d\u3067\u7d39\u4ecb\u3057\u307e\u3059\u3002","jetpack_seo_html_title":"Go select\u306e\u4f7f\u3044\u65b9\uff5c\u4e26\u884c\u51e6\u7406\u3092\u5236\u5fa1\u3059\u308b\u5b9f\u52d9\u30c6\u30af\u30cb\u30c3\u30af\u3010\u5b8c\u5168\u30ac\u30a4\u30c9\u3011","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[6,7],"class_list":["post-458","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-go","tag-go-2","tag-go"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/www.zeronana.net\/wp-content\/uploads\/2026\/05\/select.png","_links":{"self":[{"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/posts\/458","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=458"}],"version-history":[{"count":1,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/posts\/458\/revisions"}],"predecessor-version":[{"id":460,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/posts\/458\/revisions\/460"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/media\/459"}],"wp:attachment":[{"href":"https:\/\/www.zeronana.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=458"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=458"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=458"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}