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lguest: get more serious about wmb() in example Launcher code
Since the Launcher process runs the Guest, it doesn't have to be very serious about its barriers: the Guest isn't running while we are (Guest is UP). Before we change to use threads to service devices, we need to fix this. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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1 changed files with 4 additions and 3 deletions
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@ -182,9 +182,10 @@ struct virtqueue
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/* Remember the arguments to the program so we can "reboot" */
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static char **main_args;
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/* Since guest is UP and we don't run at the same time, we don't need barriers.
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* But I include them in the code in case others copy it. */
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#define wmb()
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/* We have to be careful with barriers: our devices are all run in separate
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* threads and so we need to make sure that changes visible to the Guest happen
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* in precise order. */
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#define wmb() __asm__ __volatile__("" : : : "memory")
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/* Convert an iovec element to the given type.
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*
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