[9fans] fossil periodic thread does zero sleep()

[cinap_lenrek]

Just noticed that the fsMetaFlush periodic thread in my fossil
pushes the syscall count in stats for some time now. Here is no
real load on the system and anything else works fine.

The questions are:

How to print double precisition floating point variables in acid?

Can anybody explain this fossil behaviour from the periodic code?

I checked that p->msec is 1000 in acid.

static void
periodicThread(void *a)
{
        Periodic *p = a;
        double t, ct, ts;

        vtThreadSetName("periodic");

        ct = nsec()*1e-6;
        t = ct + p->msec;

        for(;;){
                /* skip missed */
                while(t <= ct)
                        t += p->msec;

                ts = t - ct;
                if(ts > 1000)
                        ts = 1000;
                sleep(ts);
                ct = nsec()*1e-6;
                vtLock(p->lk);
                if(p->die){
                        vtUnlock(p->lk);
                        break;
                }
                if(t <= ct){
                        p->f(p->a);
                        t += p->msec;
                }
                vtUnlock(p->lk);
        }
        periodicFree(p);
}

Here is the stacktrace:

sleep()+0x7 /sys/src/libc/9syscall/sleep.s:5
periodicThread(a=0x8e8a60)+0xc9 /sys/src/cmd/fossil/periodic.c:70
        p=0x8e8a60
        ct=0x6721cc5a
        t=0x67601764
        ts=0x0
vtThread(rock=0x8e8a60,f=0x23291)+0x30 /sys/src/liboventi/plan9-thread.c:63
periodicAlloc(f=0x14933,a=0x7f690,msec=0x3e8)+0x54 
/sys/src/cmd/fossil/periodic.c:30
        p=0x8e8a60
fsOpen(mode=0x1,file=0x5ce08,z=0x5ce88,ncache=0x3e8)+0x50f 
/sys/src/cmd/fossil/fs.c:125
        fd=0x9
        disk=0x7d4d0
        fs=0x7f690
        super=0x1
        b=0x817f0
        oscore=0x7d450
        bs=0x5ce88
fsysOpen(argv=0xdfffee88,argc=0x0,name=0x5ca2d)+0x12b 
/sys/src/cmd/fossil/9fsys.c:1568
        usage=0x3e219
        ncache=0x3e8
        noventi=0x0
        wstatallow=0x0
        noperm=0x0
        noauth=0x0
        rflag=0x1
        _argc=0xfdf00063
        _args=0x3e244
        p=0x5ca3e
        fsys=0x5aa08
fsysXXX(argv=0xdfffee80,name=0x5ca2d,argc=0x3)+0xec 
/sys/src/cmd/fossil/9fsys.c:1749
        i=0x2
        r=0x245a8
        fsys=0x2449f
cmdFsys(argc=0x4,argv=0xdfffee78)+0x13c /sys/src/cmd/fossil/9fsys.c:1813
        usage=0x3e399
        _argc=0x54d00005
        _args=0x32b4a
        fsys=0x5
cliExec(buf=0x51190)+0xe0 /sys/src/cmd/fossil/Ccli.c:58
        p=0x5ca28
        argv=0x5ca28
        argc=0x5
        i=0x8
        r=0x1
main(argv=0xdfffef74,argc=0x0)+0x15a /sys/src/cmd/fossil/fossil.c:129
        cmd=0x511d0
        tflag=0x0
        ncmd=0x5
        _argc=0x63
        _args=0x3e7ab
        p=0xdfffefba
        i=0x1
_main+0x31 /sys/src/libc/386/main9.s:16

--
cinap