{"id":1180,"date":"2018-05-23T11:52:01","date_gmt":"2018-05-23T03:52:01","guid":{"rendered":"http:\/\/www.yusian.com\/blog\/?p=1180"},"modified":"2018-05-23T11:52:01","modified_gmt":"2018-05-23T03:52:01","slug":"gcd%e4%b8%ad%e7%9a%84dispatch_sync%e3%80%81dispatch_sync-%e5%88%86%e5%88%ab%e4%b8%8e%e4%b8%b2%e8%a1%8c%e3%80%81%e5%b9%b6%e8%a1%8c%e9%98%9f%e5%88%97%e7%bb%84%e5%90%88%e6%89%a7%e8%a1%8c","status":"publish","type":"post","link":"https:\/\/www.yusian.com\/blog\/project\/2018\/05\/23\/1152011180.html","title":{"rendered":"GCD\u4e2d\u7684dispatch_sync\u3001dispatch_sync \u5206\u522b\u4e0e\u4e32\u884c\u3001\u5e76\u884c\u961f\u5217\u7ec4\u5408\u6267\u884c"},"content":{"rendered":"<p>1\u3001\u6d89\u53ca\u76f8\u5173\u6982\u5ff5<br \/>\n1.1\u3001\u540c\u6b65\u3001\u5f02\u6b65<br \/>\n1.2\u3001\u81ea\u5b9a\u4e49\u4e32\u884c\u961f\u5217\u3001\u81ea\u5b9a\u4e49\u5e76\u884c\u961f\u5217\u3001\u5168\u5c40\u961f\u5217\u3001\u4e3b\u961f\u5217<br \/>\n1.3\u3001\u4e3b\u7ebf\u7a0b\u3001\u5b50\u7ebf\u7a0b<\/p>\n<p>2\u3001\u793a\u4f8b\u4ee3\u7801<\/p>\n<pre lang=\"objc\" line=\"1\">{\r\n    dispatch_queue_t serialQueue = dispatch_queue_create(\"\u4e32\u884c\u961f\u5217\", DISPATCH_QUEUE_SERIAL);\r\n    dispatch_queue_t concurrentQueue = dispatch_queue_create(\"\u5e76\u884c\u961f\u5217\", DISPATCH_QUEUE_CONCURRENT);\r\n    \r\n    dispatch_queue_t mainQueue = dispatch_get_main_queue();\r\n    dispatch_queue_t globalQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);\r\n    \r\n    \/\/1\uff1a\r\n    for(int i=0;i<10;i++){\r\n        dispatch_sync(serialQueue, ^{\r\n            NSLog(@\"\u4efb\u52a1\u6267\u884c\u4e2d....-%d\\n mainThread:%@\",i,[NSThread currentThread]);\r\n        });\r\n    }\r\n    \/\/\u7ed3\u679c\uff0c\u540c\u6b65\u4efb\u52a1\u5728\u4e32\u884c\u961f\u5217\u4e2d\uff0c\u5728\u4e3b\u7ebf\u7a0b\u4e0b\u4e32\u884c\u6267\u884c\r\n    \r\n    \/\/2\uff1a\r\n    for(int i=0;i<10;i++){\r\n        dispatch_sync(concurrentQueue, ^{\r\n            NSLog(@\"\u4efb\u52a1\u6267\u884c\u4e2d....-%d\\n mainThread:%@\",i,[NSThread currentThread]);\r\n        });\r\n    }\r\n    \/\/\u7ed3\u679c\uff0c\u540c\u6b65\u4efb\u52a1\u5728\u5e76\u884c\u961f\u5217\u4e2d\uff0c\u5728\u4e3b\u7ebf\u7a0b\u4e0b\u4e32\u884c\u6267\u884c\r\n    \r\n    \/\/3\uff1a\r\n    for(int i=0;i<10;i++){\r\n        dispatch_sync(mainQueue, ^{\r\n            NSLog(@\"\u4efb\u52a1\u6267\u884c\u4e2d....-%d\\n mainThread:%@\",i,[NSThread currentThread]);\r\n        });\r\n    }\r\n    \/\/\u7ed3\u679c\uff0c\u540c\u6b65\u4efb\u52a1\u5728\u4e3b\u961f\u5217\u4e2d\uff0c\u9501\u6b7b\r\n    \r\n    \/\/4\uff1a\r\n    for(int i=0;i<10;i++){\r\n        dispatch_sync(globalQueue, ^{\r\n            NSLog(@\"\u4efb\u52a1\u6267\u884c\u4e2d....-%d\\n mainThread:%@\",i,[NSThread currentThread]);\r\n        });\r\n    }\r\n    \/\/\u7ed3\u679c\uff0c\u540c\u6b65\u4efb\u52a1\u5728\u5168\u5c40\u961f\u5217\u4e2d\uff0c\u5728\u4e3b\u7ebf\u7a0b\u4e0b\u4e32\u884c\u6267\u884c\r\n    \r\n    \/\/5\uff1a\r\n    for(int i=0;i<10;i++){\r\n        dispatch_async(serialQueue, ^{\r\n            NSLog(@\"\u4efb\u52a1\u6267\u884c\u4e2d....-%d\\n mainThread:%@\",i,[NSThread currentThread]);\r\n        });\r\n    }\r\n    \/\/\u7ed3\u679c\uff0c\u5f02\u6b65\u4efb\u52a1\u5728\u4e32\u884c\u961f\u5217\u4e2d\uff0c\u5728\u4e00\u4e2a\u5b50\u7ebf\u7a0b\u4e2d\u4e32\u884c\u6267\u884c\r\n    \r\n    \/\/6\uff1a\r\n    for(int i=0;i<10;i++){\r\n        dispatch_async(concurrentQueue, ^{\r\n            NSLog(@\"\u4efb\u52a1\u6267\u884c\u4e2d....-%d\\n mainThread:%@\",i,[NSThread currentThread]);\r\n        });\r\n    }\r\n    \/\/\u7ed3\u679c\uff0c\u5f02\u6b65\u4efb\u52a1\u5728\u5e76\u884c\u961f\u5217\u4e2d\uff0c\u5728\u591a\u4e2a\u5b50\u7ebf\u7a0b\u4e2d\u5e76\u884c\u6267\u884c\r\n    \r\n    \/\/7\uff1a\r\n    for(int i=0;i<10;i++){\r\n        dispatch_async(mainQueue, ^{\r\n            NSLog(@\"\u4efb\u52a1\u6267\u884c\u4e2d....-%d\\n mainThread:%@\",i,[NSThread currentThread]);\r\n        });\r\n    }\r\n    \/\/\u7ed3\u679c\uff0c\u5f02\u6b65\u4efb\u52a1\u5728\u4e3b\u961f\u5217\u4e2d\uff0c\u5728\u4e3b\u7ebf\u7a0b\u4e2d\u4e32\u884c\u6267\u884c\r\n    \r\n    \/\/8\uff1a\r\n    for(int i=0;i<10;i++){\r\n        dispatch_async(globalQueue, ^{\r\n            NSLog(@\"\u4efb\u52a1\u6267\u884c\u4e2d....-%d\\n mainThread:%@\",i,[NSThread currentThread]);\r\n        });\r\n    }\r\n    \/\/\u7ed3\u679c\uff0c\u5f02\u6b65\u4efb\u52a1\u5728\u5168\u5c40\u961f\u5217\u4e2d\uff0c\u5728\u591a\u4e2a\u5b50\u7ebf\u7a0b\u4e2d\u5e76\u884c\u6267\u884c\r\n}<\/pre>\n<p>3\u3001\u7ed3\u8bba<br \/>\n3.1\u3001dispatch_sync\uff1a\u540c\u6b65\u4efb\u52a1\u65e0\u8bba\u5728\u81ea\u5b9a\u4e49\u4e32\u884c\u961f\u5217\u3001\u81ea\u5b9a\u4e49\u5e76\u884c\u961f\u5217\u3001\u4e3b\u961f\u5217\uff08\u5f53\u524d\u7ebf\u7a0b\u4e3a\u4e3b\u7ebf\u7a0b\u65f6\u4f1a\u51fa\u73b0\u6b7b\u9501\uff09\u3001\u5168\u5c40\u961f\u5217 \u6267\u884c\u4efb\u52a1\u65f6\uff0c\u90fd\u4e0d\u4f1a\u521b\u5efa\u5b50\u7ebf\u7a0b\uff0c\u800c\u662f\u5728\u5f53\u524d\u7ebf\u7a0b\u4e2d\u4e32\u884c\u6267\u884c\uff1b<br \/>\n3.2\u3001dispatch_async\uff1a\u5f02\u6b65\u4efb\u52a1\u65e0\u8bba\u5728\u81ea\u5b9a\u4e49\u4e32\u884c\u961f\u5217\u3001\u81ea\u5b9a\u4e49\u5e76\u884c\u961f\u5217\uff08\u4e3b\u961f\u5217\u9664\u5916\uff0c\u4e3b\u961f\u5217\u4e0b\uff0c\u4efb\u52a1\u4f1a\u5728\u4e3b\u7ebf\u4e2d\u4e32\u884c\u6267\u884c\uff09\u3001\u5168\u5c40\u961f\u5217 \u6267\u884c\u4efb\u52a1\u65f6\uff0c\u90fd\u4f1a\u521b\u5efa\u5b50\u7ebf\u7a0b\uff0c\u5e76\u4e14\u5728\u5b50\u7ebf\u7a0b\u4e2d\u6267\u884c\uff1b<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001\u6d89\u53ca\u76f8\u5173\u6982\u5ff5 1.1\u3001\u540c\u6b65\u3001\u5f02\u6b65 1.2\u3001\u81ea\u5b9a\u4e49\u4e32\u884c\u961f\u5217\u3001\u81ea\u5b9a\u4e49\u5e76\u884c\u961f\u5217\u3001\u5168\u5c40\u961f\u5217\u3001\u4e3b\u961f\u5217 1.3\u3001\u4e3b\u7ebf\u7a0b\u3001\u5b50\u7ebf\u7a0b 2\u3001\u793a\u4f8b\u4ee3\u7801 { dispatch_queue_t serialQueue = dispatch_queue_create(&#8220;\u4e32\u884c\u961f\u5217&#8221;, DISPATCH_QUEUE_SERIAL); dispatch_queue_t concurrentQueue = dispatch_queue_create(&#8220;\u5e76\u884c\u961f\u5217&#8221;, DISPATCH_QUEUE_CONCURRENT); dispatch_queue_t mainQueue = dispatch_get_main_queue(); dispatch_queue_t globalQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); \/\/1\uff1a for(int i=0;i<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[77,78,79,80,76,81],"class_list":["post-1180","post","type-post","status-publish","format-standard","hentry","category-project","tag-dispatch","tag-gcd","tag-79","tag-80","tag-76","tag-81"],"_links":{"self":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1180","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/comments?post=1180"}],"version-history":[{"count":0,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1180\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/media?parent=1180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/categories?post=1180"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/tags?post=1180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}