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lguest: get more serious about wmb() in example Launcher code

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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>
This commit is contained in:
Rusty Russell 2009-06-12 22:27:00 -06:00
parent 1028375e93
commit f7027c6387
1 changed files with 4 additions and 3 deletions
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7
Documentation/lguest/lguest.c
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@ -182,9 +182,10 @@ struct virtqueue
/* Remember the arguments to the program so we can "reboot" */
static char **main_args;
/* Since guest is UP and we don't run at the same time, we don't need barriers.
* But I include them in the code in case others copy it. */
#define wmb()
/* We have to be careful with barriers: our devices are all run in separate
* threads and so we need to make sure that changes visible to the Guest happen
* in precise order. */
#define wmb() __asm__ __volatile__("" : : : "memory")
/* Convert an iovec element to the given type.
*