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iOS development knowledge about GCD multithreading (1)

Source: Internet
Author: User
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1. Synchronous and asynchronous

(1) Sync: A thread wants to request a resource, but this resource is being used by the B thread because the synchronization mechanism exists, a thread requests

No, what to do, a thread can only wait to continue

(2) Async: A thread wants to request a resource, but this resource is being used by the B thread because there is no synchronization mechanism present, a thread

Still requested, a thread does not have to wait

iOS development knowledge about GCD multithreading (1)

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