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