Messages in this thread | | | Date | Mon, 28 Jun 1999 11:20:56 +0200 (MET DST) | From | Wojtek Pilorz <> | Subject | Re: do {} while(0) |
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On Mon, 28 Jun 1999, wu_yb wrote: > > There are many > do {} while(0) ; > do { ... } while(0) ; > in kernel source. > Any difference between {} and do {} while(0); or > { ... } and do {...} while(0). Are there any > special effect ? One difference is that within do { ... } while(0) block you can use break or continue to leave the block (yes, both break and continue will work the same way here) - a kind of structured goto; For example of such use, please look at file ipc/shm.c and search for 'while (0)'. Another example is in drivers/video/atafb.c (__initfunc); In general there are very few examples of such usage in kernel source. > > Thanks very much > > Best regards,
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