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Annotation of researchv10no/sys/os/trace.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * general-purpose event tracing;
        !             3:  * for debugging only
        !             4:  * don't leave calls to trace in the system;
        !             5:  * put them in when debugging things,
        !             6:  * and remove them when you're through,
        !             7:  * so you won't waste memory uselessly
        !             8:  */
        !             9: 
        !            10: #include "sys/param.h"
        !            11: #include "sys/systm.h"
        !            12: 
        !            13: #define        NTRACE  512
        !            14: 
        !            15: struct trace {
        !            16:        time_t time;
        !            17:        int i[4];
        !            18: } tracebuf[NTRACE];
        !            19: 
        !            20: int traceptr = 0;
        !            21: 
        !            22: trace(p0, p1, p2, p3)
        !            23: int p0, p1, p2, p3;
        !            24: {
        !            25:        register struct trace *tp;
        !            26:        register int s;
        !            27: 
        !            28:        s = spl7();
        !            29:        tp = &tracebuf[traceptr];
        !            30:        if (++traceptr >= NTRACE)
        !            31:                traceptr = 0;
        !            32:        splx(s);
        !            33:        tp->time = time;
        !            34:        tp->i[0] = p0;
        !            35:        tp->i[1] = p1;
        !            36:        tp->i[2] = p2;
        !            37:        tp->i[3] = p3;
        !            38: }

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