{"id":37314,"date":"2023-06-18T07:15:28","date_gmt":"2023-06-17T22:15:28","guid":{"rendered":"https:\/\/m9js.shop\/blog\/?p=37314"},"modified":"2023-06-18T07:15:28","modified_gmt":"2023-06-17T22:15:28","slug":"managing-asynchronous-tasks-with-objective-c-grand-central-dispatch-gcd","status":"publish","type":"post","link":"https:\/\/m9js.shop\/blog\/development\/managing-asynchronous-tasks-with-objective-c-grand-central-dispatch-gcd","title":{"rendered":"Objective-C\ub85c \ube44\ub3d9\uae30 \uc791\uc5c5 \uad00\ub9ac\ud558\uae30: Grand Central Dispatch(GCD)"},"content":{"rendered":"

Grand Central Dispatch(GCD)\ub780?<\/h1>\n
\uc560\ud50c\uc758 \uba40\ud2f0 \ucf54\uc5b4 \ud504\ub85c\uc138\uc11c\ub97c \ud65c\uc6a9\ud558\uae30 \uc704\ud574 \uac1c\ubc1c\ub41c Grand Central Dispatch(GCD)\ub294 Objective-C\uc5d0\uc11c \ube44\ub3d9\uae30 \uc791\uc5c5\uc744 \uad00\ub9ac\ud558\uae30 \uc704\ud55c \ud504\ub808\uc784\uc6cc\ud06c\uc785\ub2c8\ub2e4. GCD\ub294 \uc0c8\ub85c\uc6b4 \uc2a4\ub808\ub4dc\ub97c \uc0dd\uc131\ud558\uace0, \uc791\uc5c5\uc744 \ubd84\ub9ac\ud558\uba70, \uc791\uc5c5\uc744 \uc644\ub8cc\ud558\uba74 \uacb0\uacfc\uac12\uc744 \uac00\uc838\uc624\ub294 \ub4f1 \uc5ec\ub7ec \uc791\uc5c5\uc744 \uc190\uc27d\uac8c \ucc98\ub9ac\ud574\uc90d\ub2c8\ub2e4.<\/p>\n
GCD\ub294 \ub300\uaddc\ubaa8 \ub2e4\uc911 \uc2a4\ub808\ub4dc \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c\ub3c4 \uc720\uc6a9\ud558\uba70, Objective-C\uc5d0\uc11c \uac00\uc7a5 \ub9ce\uc774 \uc0ac\uc6a9\ub418\ub294 \ube44\ub3d9\uae30 \uc791\uc5c5 \uad00\ub9ac \ub3c4\uad6c \uc911 \ud558\ub098\uc785\ub2c8\ub2e4. \uc774\ubc88 \uae00\uc5d0\uc11c\ub294 GCD\uc758 \uae30\ubcf8 \uac1c\ub150\uacfc \ud568\uaed8 Objective-C\uc5d0\uc11c GCD\ub97c \ud65c\uc6a9\ud55c \ube44\ub3d9\uae30 \uc791\uc5c5 \uc608\uc81c\ub97c \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n
$\"GCD\"$ <\/p>\n

GCD\ub97c \uc0ac\uc6a9\ud558\uc5ec \ube44\ub3d9\uae30 \uc791\uc5c5 \uad00\ub9ac\ud558\uae30<\/h2>\n
GCD\ub97c \uc0ac\uc6a9\ud558\uba74 \ub9ce\uc740 \uc791\uc5c5\uc744 \ubcd1\ub82c\ub85c \ucc98\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \uc131\ub2a5\uc744 \ud5a5\uc0c1\uc2dc\ud0ac \uc218 \uc788\uc2b5\ub2c8\ub2e4. GCD\ub294 \ud050(queue)\uc640 \ube14\ub85d(block)\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc791\uc5c5\uc744 \uad00\ub9ac\ud569\ub2c8\ub2e4.<\/p>\n
GCD\ub294 \ud050\uc640 \ube14\ub85d\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc791\uc5c5\uc744 \uad00\ub9ac\ud569\ub2c8\ub2e4. \ud050\ub294 \uc791\uc5c5 \ub2e8\uc704\ub97c \uc800\uc7a5\ud558\ub294 \ucee8\ud14c\uc774\ub108\uc785\ub2c8\ub2e4. \ud050\ub294 FIFO(First In First Out) \ubc29\uc2dd\uc73c\ub85c \uc791\uc5c5\uc744 \ucc98\ub9ac\ud569\ub2c8\ub2e4. \ud050\ub294 \uba54\uc778 \ud050, \uae00\ub85c\ubc8c \ud050, \uc0ac\uc6a9\uc790 \uc815\uc758 \ud050 \ub4f1 \ub2e4\uc591\ud55c \uc885\ub958\uac00 \uc788\uc2b5\ub2c8\ub2e4. \ube14\ub85d\uc740 \uc2e4\ud589\ud560 \ucf54\ub4dc \ub369\uc5b4\ub9ac\uc785\ub2c8\ub2e4. \ube14\ub85d\uc740 \uc791\uc5c5\uc744 \uc218\ud589\ud558\ub294 \ud568\uc218\ub098 \uba54\uc11c\ub4dc\uc640 \uac19\uc740 \ucf54\ub4dc\ub97c \ud3ec\ud568\ud569\ub2c8\ub2e4.<\/p>\n
GCD\ub294 \ub514\uc2a4\ud328\uce58(dispatch)\ub77c\ub294 \uc6a9\uc5b4\ub97c \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \ub514\uc2a4\ud328\uce58\ub294 \uc791\uc5c5\uc744 \ud050\uc5d0 \ucd94\uac00\ud558\uace0, \ud050\uc5d0\uc11c \uc791\uc5c5\uc744 \uac00\uc838\uc640\uc11c \uc2e4\ud589\ud558\ub294 \uac83\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4. GCD\ub294 \ud050\uc640 \ube14\ub85d\uc744 \uc0ac\uc6a9\ud558\uc5ec \ub514\uc2a4\ud328\uce58\ub97c \uc218\ud589\ud569\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574 \ube44\ub3d9\uae30 \uc791\uc5c5\uc744 \uc27d\uac8c \uad00\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

GCD\uc758 \ud050(Queue)\uc640 \ube14\ub85d(Block) \uc774\ud574\ud558\uae30<\/h2>\n

\ud050(Queue)<\/h3>\n

GCD\uc5d0\uc11c \ud050\ub294 \uc791\uc5c5 \ub2e8\uc704\ub97c \uc800\uc7a5\ud558\ub294 \ucee8\ud14c\uc774\ub108\uc785\ub2c8\ub2e4. \ud050\ub294 \uc791\uc5c5\uc744 \uc21c\uc11c\ub300\ub85c \ucc98\ub9ac\ud558\ub294 FIFO(First In First Out) \ubc29\uc2dd\uc744 \uc0ac\uc6a9\ud569\ub2c8\ub2e4. \ud050\ub294 \uba54\uc778 \ud050, \uae00\ub85c\ubc8c \ud050, \uc0ac\uc6a9\uc790 \uc815\uc758 \ud050 \ub4f1 \ub2e4\uc591\ud55c \uc885\ub958\uac00 \uc788\uc2b5\ub2c8\ub2e4. <\/p>\n

\uba54\uc778 \ud050\n

\uba54\uc778 \ud050\ub294 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \uba54\uc778 \uc2a4\ub808\ub4dc\uc5d0\uc11c \uc2e4\ud589\ub429\ub2c8\ub2e4. \uba54\uc778 \ud050\ub294 \uc0ac\uc6a9\uc790 \uc778\ud130\ud398\uc774\uc2a4 \uc5c5\ub370\uc774\ud2b8\uc640 \uac19\uc740 \uc791\uc5c5\uc744 \ucc98\ub9ac\ud558\uae30 \uc704\ud574 \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/li>\n<\/ul>\n<\/li>\n

\uae00\ub85c\ubc8c \ud050\n

\uae00\ub85c\ubc8c \ud050\ub294 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \uc804\uc5ed\uc801\uc73c\ub85c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \ud050\uc785\ub2c8\ub2e4. \uae00\ub85c\ubc8c \ud050\ub294 low, default, high, background\uc640 \uac19\uc740 \uc6b0\uc120\uc21c\uc704\ub97c \uac00\uc9c0\uba70, \ub3d9\uc2dc\uc5d0 \uc5ec\ub7ec \uc791\uc5c5\uc744 \ucc98\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/li>\n<\/ul>\n<\/li>\n

\uc0ac\uc6a9\uc790 \uc815\uc758 \ud050\n

\uc0ac\uc6a9\uc790 \uc815\uc758 \ud050\ub294 \uac1c\ubc1c\uc790\uac00 \uc9c1\uc811 \ub9cc\ub4e4\uc5b4\uc11c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \ud050\uc785\ub2c8\ub2e4. \uc0ac\uc6a9\uc790 \uc815\uc758 \ud050\ub294 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \ud2b9\uc815 \uc791\uc5c5\uc744 \ucc98\ub9ac\ud558\uae30 \uc704\ud574 \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

\ube14\ub85d(Block)<\/h3>\n
GCD\uc5d0\uc11c \ube14\ub85d\uc740 \uc2e4\ud589\ud560 \ucf54\ub4dc \ub369\uc5b4\ub9ac\uc785\ub2c8\ub2e4. \ube14\ub85d\uc740 \uc791\uc5c5\uc744 \uc218\ud589\ud558\ub294 \ud568\uc218\ub098 \uba54\uc11c\ub4dc\uc640 \uac19\uc740 \ucf54\ub4dc\ub97c \ud3ec\ud568\ud569\ub2c8\ub2e4. \ube14\ub85d\uc740 \uc791\uc5c5\uc744 \uc218\ud589\ud558\uae30 \uc704\ud574 \ud544\uc694\ud55c \ub370\uc774\ud130\ub97c \ucea1\ucc98\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. <\/p>\n
GCD\ub294 \ud050\uc640 \ube14\ub85d\uc744 \uc0ac\uc6a9\ud558\uc5ec \uc791\uc5c5\uc744 \uad00\ub9ac\ud569\ub2c8\ub2e4. \ube14\ub85d\uc744 \ud050\uc5d0 \ucd94\uac00\ud558\uba74 GCD\ub294 \ud574\ub2f9 \ud050\uc5d0\uc11c \ube14\ub85d\uc744 \uc2e4\ud589\ud569\ub2c8\ub2e4. \uc774\ub97c \ud1b5\ud574 \ube44\ub3d9\uae30 \uc791\uc5c5\uc744 \uc27d\uac8c \uad00\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

Objective-C\uc5d0\uc11c GCD\ub97c \ud65c\uc6a9\ud55c \ube44\ub3d9\uae30 \uc791\uc5c5 \uc608\uc81c<\/h2>\n

\uc774\uc81c Objective-C\uc5d0\uc11c GCD\ub97c \ud65c\uc6a9\ud558\uc5ec \ube44\ub3d9\uae30 \uc791\uc5c5\uc744 \uc218\ud589\ud558\ub294 \uc608\uc81c\ub97c \uc0b4\ud3b4\ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{\n    \/\/ \ube44\ub3d9\uae30 \uc791\uc5c5\uc744 \uc218\ud589\ud558\ub294 \ube14\ub85d\n    NSLog(@\"\ube44\ub3d9\uae30 \uc791\uc5c5 \uc2dc\uc791\");\n    \/\/ 5\ucd08 \ub3d9\uc548 \ub300\uae30\n    [NSThread sleepForTimeInterval:5.0f];\n    NSLog(@\"\ube44\ub3d9\uae30 \uc791\uc5c5 \uc885\ub8cc\");\n    \/\/ \uba54\uc778 \ud050\uc5d0\uc11c \uc2e4\ud589\ud560 \ube14\ub85d\n    dispatch_async(dispatch_get_main_queue(), ^{\n        NSLog(@\"\ube44\ub3d9\uae30 \uc791\uc5c5 \uacb0\uacfc\ub97c \uba54\uc778 \uc2a4\ub808\ub4dc\uc5d0\uc11c \ucc98\ub9ac\");\n    });\n});<\/code><\/pre>\n\uc704 \uc608\uc81c\uc5d0\uc11c\ub294 dispatch_async\ub97c \uc0ac\uc6a9\ud558\uc5ec GCD \ud050\uc5d0 \ube44\ub3d9\uae30 \uc791\uc5c5\uc744 \ucd94\uac00\ud569\ub2c8\ub2e4. dispatch_async\ub294 \ud050\uc5d0 \ube14\ub85d\uc744 \ucd94\uac00\ud560 \ub54c \uc0ac\uc6a9\ub418\uba70, \ud050\uc5d0\uc11c \ube14\ub85d\uc744 \uc2e4\ud589\ud558\ub294 \ub3d9\uc2dc\uc5d0 \ub2e4\ub978 \uc791\uc5c5\uc744 \uc218\ud589\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
dispatch_get_global_queue \ud568\uc218\ub294 \uae00\ub85c\ubc8c \ud050\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4. \uc774 \ud568\uc218\ub294 \ub450 \uac1c\uc758 \ub9e4\uac1c\ubcc0\uc218\ub97c \uac00\uc9c0\uba70, \uccab \ubc88\uc9f8 \ub9e4\uac1c\ubcc0\uc218\ub294 \ud050\uc758 \uc6b0\uc120\uc21c\uc704\ub97c \uc124\uc815\ud558\uace0, \ub450 \ubc88\uc9f8 \ub9e4\uac1c\ubcc0\uc218\ub294 \uc608\uc57d\ub41c \uac83\uc740 \uc5c6\uc9c0\ub9cc \ud050\uc758 \ud06c\uae30\ub97c \uc81c\ud55c\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n
\uba3c\uc800 \uae00\ub85c\ubc8c \ud050\uc5d0\uc11c \ube44\ub3d9\uae30 \uc791\uc5c5\uc744 \uc2e4\ud589\ud558\uace0, 5\ucd08 \ub3d9\uc548 \ub300\uae30\ud55c \ud6c4\uc5d0 \ube44\ub3d9\uae30 \uc791\uc5c5\uc774 \uc644\ub8cc\ub418\uc5c8\uc74c\uc744 \ub098\ud0c0\ub0b4\ub294 \ub85c\uadf8\ub97c \ucd9c\ub825\ud569\ub2c8\ub2e4. \uadf8\ub9ac\uace0\ub098\uc11c \uba54\uc778 \ud050\uc5d0\uc11c \uc2e4\ud589\ud560 \ube14\ub85d\uc744 \ucd94\uac00\ud569\ub2c8\ub2e4. dispatch_get_main_queue \ud568\uc218\ub294 \uba54\uc778 \ud050\ub97c \ubc18\ud658\ud569\ub2c8\ub2e4. \uba54\uc778 \ud050\uc5d0\uc11c \ucd94\uac00\ub41c \ube14\ub85d\uc740 \uba54\uc778 \uc2a4\ub808\ub4dc\uc5d0\uc11c \uc2e4\ud589\ub429\ub2c8\ub2e4.<\/p>\n
\uc774\uc81c Objective-C\uc5d0\uc11c GCD\ub97c \uc0ac\uc6a9\ud558\uc5ec \ube44\ub3d9\uae30 \uc791\uc5c5\uc744 \uc27d\uac8c \uad00\ub9ac\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4. GCD\ub294 \uba40\ud2f0 \ucf54\uc5b4 \ud504\ub85c\uc138\uc11c\ub97c \ud65c\uc6a9\ud558\uace0, \uc5ec\ub7ec \uc791\uc5c5\uc744 \uc190\uc27d\uac8c \ucc98\ub9ac\ud560 \uc218 \uc788\ub294 \ud504\ub808\uc784\uc6cc\ud06c\uc785\ub2c8\ub2e4. \ub2e4\uc591\ud55c \ud050\uc640 \ube14\ub85d\uc744 \uc0ac\uc6a9\ud558\uc5ec \ube44\ub3d9\uae30 \uc791\uc5c5\uc744 \uad00\ub9ac\ud560 \uc218 \uc788\uc73c\uba70, \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \uc131\ub2a5\uc744 \ud5a5\uc0c1\uc2dc\ud0ac \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"
Objective-C\uc5d0\uc11c GCD\ub97c \ud65c\uc6a9\ud558\uc5ec \ube44\ub3d9\uae30 \uc791\uc5c5\uc744 \ud6a8\uc728\uc801\uc73c\ub85c \uad00\ub9ac\ud558\ub294 \ubc29\ubc95<\/p>\n","protected":false},"author":1,"featured_media":33704,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1957],"tags":[2142,6040,6041,3291],"class_list":["post-37314","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-development","tag-high","tag-ios","tag-swift","tag-3291"],"acf":[],"_links":{"self":[{"href":"https:\/\/m9js.shop\/blog\/wp-json\/wp\/v2\/posts\/37314","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/m9js.shop\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/m9js.shop\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/m9js.shop\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/m9js.shop\/blog\/wp-json\/wp\/v2\/comments?post=37314"}],"version-history":[{"count":1,"href":"https:\/\/m9js.shop\/blog\/wp-json\/wp\/v2\/posts\/37314\/revisions"}],"predecessor-version":[{"id":37333,"href":"https:\/\/m9js.shop\/blog\/wp-json\/wp\/v2\/posts\/37314\/revisions\/37333"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/m9js.shop\/blog\/wp-json\/wp\/v2\/media\/33704"}],"wp:attachment":[{"href":"https:\/\/m9js.shop\/blog\/wp-json\/wp\/v2\/media?parent=37314"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/m9js.shop\/blog\/wp-json\/wp\/v2\/categories?post=37314"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/m9js.shop\/blog\/wp-json\/wp\/v2\/tags?post=37314"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}