On Tue, Mar 10, 2015 at 12:48:08PM +0100, telecolega . wrote: > I am trying to understand the code of QEMU and one of the things which > is unclear to me is what are the purposes of the loops: > main_loop_wait() and os_host_main_loop_wait(). They both look similar > since they prepare fds, poll them and dispatch them but I assume they > process different fds (otherwise, why there would be two different > loops?).
main_loop_wait() is QEMU's main event loop. os_host_main_loop_wait() is the host OS-specific implementation of event waiting code. This function is not a loop, it just waits for a given time duration - i.e. a single iteration of the main_loop_wait() loop. main_loop_wait() is portable code, os_host_main_loop_wait() is host OS-specific (there is a POSIX and a Windows implementation). So the split between these two functions is largely for sharing the portable main_loop_wait() logic. Stefan
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