/* * Copyright (C) 2008 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Apple Inc. ("Apple") nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "SystemMemory.h" #include <mach/mach.h> #include <sys/sysctl.h> #include <wtf/Assertions.h> #include <wtf/CurrentTime.h> namespace WebCore { int systemMemoryLevel() { #if PLATFORM(IOS_SIMULATOR) return 35; #else static int memoryFreeLevel = -1; static double previousCheckTime; double time = currentTime(); if (time - previousCheckTime < 0.1) return memoryFreeLevel; previousCheckTime = time; size_t size = sizeof(memoryFreeLevel); sysctlbyname("kern.memorystatus_level", &memoryFreeLevel, &size, nullptr, 0); return memoryFreeLevel; #endif } #if !PLATFORM(IOS_SIMULATOR) static host_basic_info_data_t gHostBasicInfo; static void initCapabilities(void) { // Discover our CPU type mach_port_t host = mach_host_self(); mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT; kern_return_t returnValue = host_info(host, HOST_BASIC_INFO, reinterpret_cast<host_info_t>(&gHostBasicInfo), &count); mach_port_deallocate(mach_task_self(), host); if (returnValue != KERN_SUCCESS) LOG_ERROR("%s : host_info(%d) : %s.\n", __FUNCTION__, returnValue, mach_error_string(returnValue)); } #endif size_t systemTotalMemory() { #if PLATFORM(IOS_SIMULATOR) return 512 * 1024 * 1024; #else // FIXME: Consider using C++11 thread primitives. static pthread_once_t initControl = PTHREAD_ONCE_INIT; pthread_once(&initControl, initCapabilities); // The value in gHostBasicInfo.max_mem is often lower than the amount we're // interested in (e.g., does this device have at least 256MB of RAM?) // Round the value to the nearest power of 2. return static_cast<size_t>(exp2(ceil(log2(gHostBasicInfo.max_mem)))); #endif } } // namespace WebCore