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Let's walk through the sequence of events that occur when you run this code I've numbered the particularly interesting regions of code with a statement numbering scheme (50, 51 , and so on) to make it easier to refer back to the sample 50 The ma i n function begins on to (to is a symbol here; the thread ID returned by GetC u r rentTh r e a d l d and printed to standard output depends on the whims of the 05 thread ID numbering scheme) We then immediately convert to to a fiber, storing its fiber handle in the
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g l o b a l g_p F i b e re variable At this point, the thread is running g_p F i b e re (fO)
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51 We create a new thread, which we'll call tl , from our ma i n function whose thread start routine is the R u n Ot h e r F i b e r function 52 Inside of R u n Ot h e r F i b e r, on tl , we wait for an event g_pSwa pped Out E v e n t that will be set once to has switched to a separate fiber We need to wait for this to happen before tl can run g_p F i be re because until the event is set, to is still actively running its original fiber, meaning we can't touch it from t1 53 Meanwhile, to continues, creating a new fiber p F i berl whose fiber start routine is F i be rMa i n It then switches to it At this point no thread is running g_p F i be re: that is, its stack is not active on any thread 54 The F i be rMa i n function, being run on thread 0 as part of executing p F i b e r l (fl ), sets the g_pSwa ppedOu t E v e n t on which tl is waiting, prints some information to standard output, and returns The thread may or may not exit the system entirely before tl notices that the event has been set 55 After we're sure to is definitely not using g_p F i b e re, tl switches to it via Swi t c hToF iber (Note that we didn't save the LPVOID returned when t1 called ConvertTh readTo F i b e r; normally this would be bad because we would no longer be able to recover it: the resources associated with it, including its stack, would be completely leaked But in this simple example, we can ignore this minor point, just like we're ignoring the fact that this example doesn't check for error conditions at all) 56 Once tl has switched to g_p F i b e re, control on tl transfers back to the m a i n routine where to had left off with its own previous call to
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Ad d i t i o n a l Fi ber- R e la ted To p i c s
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Swit c h To F i be r (when it switched to p F i be r l ) What happened was
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that to made the call to Swi t c hTo F i be r inside ma i n , while tl later returned from this same function call This thread now prints infor mation to standard output-you'll notice the thread ID printed here is different than the one printed in SO-and then returns Once both to and tl have exited, the program will exit This example is of very little practical value But if you follow the sequence of events, studying this example should help to solidify your mental model and understanding of how fibers work Extending this some thing more useful (such as a coroutine-like system) is not difficult
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