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#include <u.h>
#include <libc.h>
#include "iotrack.h"
#include "dat.h"
#include "fns.h"
void
mlock(MLock *l)
{
if(l->key != 0 && l->key != 1)
panic("uninitialized lock");
if (l->key)
panic("lock");
l->key = 1;
}
void
unmlock(MLock *l)
{
if(l->key != 0 && l->key != 1)
panic("uninitialized unlock");
if (!l->key)
panic("unlock");
l->key = 0;
}
int
canmlock(MLock *l)
{
if(l->key != 0 && l->key != 1)
panic("uninitialized canlock");
if (l->key)
return 0;
l->key = 1;
return 1;
}
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