/* ** Initialize this module. */ static int sqlite3MemInit(void *NotUsed){ #if defined(__APPLE__) && !defined(SQLITE_WITHOUT_ZONEMALLOC) int cpuCount; size_t len; if( _sqliteZone_ ){ return SQLITE_OK; } len = sizeof(cpuCount); /* One usually wants to use hw.acctivecpu for MT decisions, but not here */ sysctlbyname("hw.ncpu", &cpuCount, &len, NULL, 0); if( cpuCount>1 ){ /* defer MT decisions to system malloc */ _sqliteZone_ = malloc_default_zone(); }else{ /* only 1 core, use our own zone to contention over global locks, ** e.g. we have our own dedicated locks */ bool success; malloc_zone_t* newzone = malloc_create_zone(4096, 0); malloc_set_zone_name(newzone, "Sqlite_Heap"); do{ success = OSAtomicCompareAndSwapPtrBarrier(NULL, newzone, (void * volatile *)&_sqliteZone_); }while(!_sqliteZone_); if( !success ){ /* somebody registered a zone first */ malloc_destroy_zone(newzone); } } #endif UNUSED_PARAMETER(NotUsed); return SQLITE_OK; }
FMacMallocZone::~FMacMallocZone() { if ( MemoryZone ) { malloc_destroy_zone( MemoryZone ); } }