Coroutines

Question 1

the CPU code of coroutines always appears in two places in a trace.

Answer 1

All of the initial code in a coroutine, from the start of the coroutine method until it yields for the first time, appears in the trace wherever the coroutine is started.

All of the rest of a coroutine’s code – from the first time it resumes until it finished executing – appears within the DelayedCallManager line that appears inside Unity’s main loop.

Question 2

Coroutines are backed by an instance of a class that is autogenerated by the C# compiler.

Answer 2

local-scope variables are hoisted into the generated class and therefore remain allocated on the heap for the duration of the coroutine.