Last change
on this file since 7bf3856 was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 8 years ago |
Imported original source code.
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File size:
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1 | /*
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2 | =============================================================================
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3 | mtsetp.c -- Multi-Tasker -- change task priority
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4 | Version 4 -- 1988-04-11 -- D.N. Lynx Crowe
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5 | (c) Copyright 1988 -- D.N. Lynx Crowe
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6 | =============================================================================
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7 | */
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8 |
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9 | #include "stddefs.h"
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10 | #include "biosdefs.h"
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11 | #include "mtdefs.h"
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12 |
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13 | extern short setipl(); /* set processor IPL function */
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14 |
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15 | extern struct _mt_def *_MT_;
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16 |
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17 | /*
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18 | =============================================================================
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19 | MTSetP() -- reset task priority and dispatch to highest priority task
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20 |
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21 | Returns old task priority.
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22 | =============================================================================
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23 | */
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24 |
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25 | unsigned
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26 | MTSetP(pri)
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27 | unsigned pri;
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28 | {
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29 | register short oldipl;
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30 | register unsigned oldpri;
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31 |
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32 | if ((struct _mt_def *)NIL EQ _MT_)
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33 | _MT_ = (struct _mt_def *)XBIOS(X_MTDEFS);
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34 |
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35 | oldipl = setipl(7); /* DISABLE INTERRUPTS */
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36 |
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37 | oldpri = _MT_->mtp->CurP->pri; /* get old task priority */
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38 | _MT_->mtp->CurP->pri = pri; /* set new priority for task */
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39 |
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40 | setipl(oldipl); /* RESTORE INTERRUPTS */
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41 |
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42 | MTSwap(); /* swap to highest priority ready task */
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43 | return(oldpri); /* return old task priority */
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44 | }
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45 |
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