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Add a way for device to be polled when CPU is idle. Maybe this can be used

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to interleave user processes with device & DIM processes, for example, during
a file upload.
This commit is contained in:
Jim 2011-09-05 16:20:26 -04:00
parent 023edffb04
commit 88d7a3fba6
1 changed files with 19 additions and 10 deletions
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29
em.c
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@ -1744,13 +1744,16 @@ static unsigned short tstq(ea_t qcbea) {
return (qbot-qtop) & qmask;
}
/* I/O device map table, containing function pointers to handle device I/O */
/* devpoll: number of instructions until device poll
devpollidle: true if device wants to be polled when CPU is idle */
static int devpoll[64] = {0};
static int devpollidle[64] = {0};
#include "emdev.h"
/* I/O device map table, containing function pointers to handle device I/O */
#ifdef HOBBY
/* this is the "hobby system" controller configuration:
@ -6622,14 +6625,20 @@ d_bdx: /* 0140734 */
stopwatch_start(&sw_idle);
utempl = gvp->instpermsec*100; /* limit delay to 100 msecs */
for (i=0; i<64; i++) /* check device timers */
if (devpoll[i]) /* poll set? */
if (devpoll[i] <= 100) { /* too fast! */
utempl = 1;
break;
} else if (devpoll[i] < utempl)
utempl = devpoll[i];
for (i=0; i<64; i++) /* see if any devices */
if (devpollidle[i]) { /* want a poll when idle? */
devpoll[i] = 1; /* yes, force it now */
utempl = 1;
}
if (utempl > 1)
for (i=0; i<64; i++) /* check device timers */
if (devpoll[i]) /* poll set? */
if (devpoll[i] <= 100) { /* too fast! */
utempl = 1;
break;
} else if (devpoll[i] < utempl)
utempl = devpoll[i];
/* this decrement ensures that if a device had a poll pending,
we won't decrement it to zero below, ie, it'll still fire
in the main loop */