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28 lines
708 B
28 lines
708 B
/* chprio.c - chprio */ |
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#include <xinu.h> |
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/*------------------------------------------------------------------------ |
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* chprio - Change the scheduling priority of a process |
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*------------------------------------------------------------------------ |
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*/ |
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pri16 chprio( |
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pid32 pid, /* ID of process to change */ |
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pri16 newprio /* New priority */ |
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) |
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{ |
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intmask mask; /* Saved interrupt mask */ |
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struct procent *prptr; /* Ptr to process's table entry */ |
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pri16 oldprio; /* Priority to return */ |
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mask = disable(); |
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if (isbadpid(pid)) { |
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restore(mask); |
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return (pri16) SYSERR; |
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} |
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prptr = &proctab[pid]; |
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oldprio = prptr->prprio; |
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prptr->prprio = newprio; |
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restore(mask); |
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return oldprio; |
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}
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