/*
* __os_spin --
* Return the number of default spins before blocking.
*
* PUBLIC: int __os_spin __P((void));
*/
int
__os_spin()
{
/*
* If the application specified a value or we've already figured it
* out, return it.
*
* XXX
* We don't want to repeatedly call the underlying function because
* it can be expensive (e.g., requiring multiple filesystem accesses
* under Debian Linux).
*/
if (DB_GLOBAL(db_tas_spins) != 0)
return (DB_GLOBAL(db_tas_spins));
DB_GLOBAL(db_tas_spins) = 1;
#if defined(HAVE_PSTAT_GETDYNAMIC)
DB_GLOBAL(db_tas_spins) = __os_pstat_getdynamic();
#endif
#if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
DB_GLOBAL(db_tas_spins) = __os_sysconf();
#endif
/*
* Spin 50 times per processor, we have anecdotal evidence that this
* is a reasonable value.
*/
if (DB_GLOBAL(db_tas_spins) != 1)
DB_GLOBAL(db_tas_spins) *= 50;
return (DB_GLOBAL(db_tas_spins));
}
/*
* brew_bdb_begin --
* Initialize the BREW port of Berkeley DB.
*/
int
brew_bdb_begin()
{
void *p;
/*
* The BREW ARM compiler can't handle statics or globals, so we have
* store them off the AEEApplet and initialize them in in-line code.
*/
p = ((BDBApp *)GETAPPINSTANCE())->db_global_values;
if (p == NULL) {
if ((p = malloc(sizeof(DB_GLOBALS))) == NULL)
return (ENOMEM);
memset(p, 0, sizeof(DB_GLOBALS));
((BDBApp *)GETAPPINSTANCE())->db_global_values = p;
TAILQ_INIT(&DB_GLOBAL(db_envq));
DB_GLOBAL(db_line) =
"=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=";
}
return (0);
}
