47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997,2008 Oracle. All rights reserved.
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*
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* $Id: os_vx_yield.c 63573 2008-05-23 21:43:21Z trent.nelson $
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*/
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#include "db_config.h"
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#include "db_int.h"
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/*
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* __os_yield --
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* Yield the processor, optionally pausing until running again.
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*/
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void
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__os_yield(env, secs, usecs)
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ENV *env;
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u_long secs, usecs; /* Seconds and microseconds. */
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{
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int ticks_delay, ticks_per_second;
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COMPQUIET(env, NULL);
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/* Don't require the values be normalized. */
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for (; usecs >= US_PER_SEC; usecs -= US_PER_SEC)
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++secs;
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/*
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* Yield the processor so other processes or threads can run.
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*
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* As a side effect, taskDelay() moves the calling task to the end of
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* the ready queue for tasks of the same priority. In particular, you
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* can yield the CPU to any other tasks of the same priority by
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* "delaying" for zero clock ticks.
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*
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* Never wait less than a tick, if we were supposed to wait at all.
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*/
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ticks_per_second = sysClkRateGet();
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ticks_delay =
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secs * ticks_per_second + (usecs * ticks_per_second) / US_PER_SEC;
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if (ticks_delay == 0 && (secs != 0 || usecs != 0))
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ticks_delay = 1;
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(void)taskDelay(ticks_delay);
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}
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