#include "db_config.h"
#ifndef lint
static const char revid[] = "$Id: os_spin.c,v 1.2 2004/03/30 01:23:46 jtownsen Exp $";
#endif
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#if defined(HAVE_PSTAT_GETDYNAMIC)
#include <sys/pstat.h>
#endif
#include <limits.h>
#include <unistd.h>
#endif
#include "db_int.h"
#if defined(HAVE_PSTAT_GETDYNAMIC)
static int __os_pstat_getdynamic __P((void));
static int
__os_pstat_getdynamic()
{
struct pst_dynamic psd;
return (pstat_getdynamic(&psd,
sizeof(psd), (size_t)1, 0) == -1 ? 1 : psd.psd_proc_cnt);
}
#endif
#if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
static int __os_sysconf __P((void));
static int
__os_sysconf()
{
long nproc;
return ((nproc = sysconf(_SC_NPROCESSORS_ONLN)) > 1 ? (int)nproc : 1);
}
#endif
void
__os_spin(dbenv)
DB_ENV *dbenv;
{
if (dbenv->tas_spins != 0)
return;
dbenv->tas_spins = 1;
#if defined(HAVE_PSTAT_GETDYNAMIC)
dbenv->tas_spins = __os_pstat_getdynamic();
#endif
#if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
dbenv->tas_spins = __os_sysconf();
#endif
if (dbenv->tas_spins != 1)
dbenv->tas_spins *= 50;
}
void
__os_yield(dbenv, usecs)
DB_ENV *dbenv;
u_long usecs;
{
if (DB_GLOBAL(j_yield) != NULL && DB_GLOBAL(j_yield)() == 0)
return;
#ifdef HAVE_VXWORKS
taskDelay(1);
#endif
(void)__os_sleep(dbenv, 0, usecs);
}