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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100755
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File size:
1.2 KB
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[3ae31e9] | 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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