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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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