KobeLG的博客

dispatch_block最显著的功能就是可以取消执行的代码块基本函数void dispatch_block_perform(dispatch_block_flags_t flags, DISPATCH_NOESCAPE dispatch_block_t block); long dispatch_block_wait(dispatch_block_t block, dispatc

dispatch_semaphore_t dispatch_semaphore_create(long value); dispatch_semaphore_wait(dispatch_semaphore_t sema, dispatch_time_t timeout); dispatch_semaphore_signal(dispatch_semaphore_t dsema); iOS 信号量 semaphore