Subversion Repositories planix.SVN

#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;
}