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Annotation of researchv10no/sys/os/trace.c, revision 1.1.1.1

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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