获取已用内存和剩余内存方法

获取已用内存方法

/// 获取已用内存
vm_size_t getUsedMemory(void);

方法实现

/// 获取已用内存
vm_size_t getUsedMemory() {
    task_basic_info_data_t info;
    mach_msg_type_number_t size = sizeof(info);
    kern_return_t kerr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t) &info, &size);
    if (kerr == KERN_SUCCESS) {
        return info.resident_size;
    } else {
        return 0;
    }
}

获取剩余内存

/// 获取剩余内存
vm_size_t getFreeMemory(void)

方法实现

/// 获取剩余内存
vm_size_t getFreeMemory(void) {
    mach_port_t host = mach_host_self();
    mach_msg_type_number_t size = sizeof(vm_statistics_data_t) / sizeof(integer_t);
    vm_size_t pagessize;
    vm_statistics_data_t vmstat;
    
    host_page_size(host, &pagessize);
    host_statistics(host, HOST_VM_INFO, (host_info_t) &vmstat, &size);
    return vmstat.free_count * pagessize;
}