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    waitq_sleep(&can_start);
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    waitq_sleep(&can_start);
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    for (i = 0; i<ATTEMPTS; i++) {
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    for (i = 0; i<ATTEMPTS; i++) {
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        __asm__ volatile (
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        __asm__ volatile (
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            "ctc1 %0,$1"
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            "mtc1 %0,$1"
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            :"=r"(arg)
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            :"=r"(arg)
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            );
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            );
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        scheduler();
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        scheduler();
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        __asm__ volatile (
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        __asm__ volatile (
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            "cfc1 %0,$1"
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            "mfc1 %0,$1"
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            :"=r"(after_arg)
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            :"=r"(after_arg)
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            );
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            );
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        if(arg != after_arg)
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        if(arg != after_arg)
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            panic("Control reg tid%d: arg(%d) != %d\n",
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            panic("General reg tid%d: arg(%d) != %d\n",
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                  THREAD->tid, arg, after_arg);
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                  THREAD->tid, arg, after_arg);
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    }
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    }
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    atomic_inc(&threads_ok);
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    atomic_inc(&threads_ok);
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}
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}