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36 lines
835 B
36 lines
835 B
/* semdelete.c - semdelete */ |
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#include <xinu.h> |
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/*------------------------------------------------------------------------ |
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* semdelete - Delete a semaphore by releasing its table entry |
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*------------------------------------------------------------------------ |
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*/ |
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syscall semdelete( |
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sid32 sem /* ID of semaphore to delete */ |
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) |
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{ |
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intmask mask; /* Saved interrupt mask */ |
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struct sentry *semptr; /* Ptr to semaphore table entry */ |
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mask = disable(); |
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if (isbadsem(sem)) { |
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restore(mask); |
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return SYSERR; |
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} |
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semptr = &semtab[sem]; |
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if (semptr->sstate == S_FREE) { |
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restore(mask); |
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return SYSERR; |
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} |
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semptr->sstate = S_FREE; |
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resched_cntl(DEFER_START); |
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while (semptr->scount++ < 0) { /* Free all waiting processes */ |
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ready(getfirst(semptr->squeue)); |
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} |
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resched_cntl(DEFER_STOP); |
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restore(mask); |
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return OK; |
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}
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