57 lines
1.0 KiB
C
57 lines
1.0 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997
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* Sleepycat Software. All rights reserved.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)os_spin.c 10.3 (Sleepycat) 11/25/97";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <limits.h>
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#include <unistd.h>
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#endif
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#include "db_int.h"
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/*
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* __os_spin --
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* Return the number of default spins before blocking.
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*
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* PUBLIC: int __os_spin __P((void));
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*/
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int
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__os_spin()
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{
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extern int __db_tsl_spins;
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/* If the application specified the spins, use its value. */
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if (__db_tsl_spins != 0)
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return (__db_tsl_spins);
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/*
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* XXX
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* Sysconf: Solaris uses _SC_NPROCESSORS_ONLN to return the number
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* of online processors. I don't know if this call is portable or
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* not.
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*/
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#if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
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{
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long sys_val;
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sys_val = sysconf(_SC_NPROCESSORS_ONLN);
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if (sys_val > 0)
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return (sys_val * 50);
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}
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#endif
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/* Default to a single processor. */
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return (1);
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}
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