我见过以下几种用法:dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds* NSEC_PER_SEC); //code to be executedon the main queue after delay
[self doSometi
最近,我正在测试ext4文件系统的正确用法。我的专家是: 1. call fallocate to alloc centain space fallocate(fd, 0, 0, 4\*1024\*1024);我的问题是:
<1. why after calling fallocate and fsync the metadata of the file still