system.c

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#include "system.h"
 
size_t getAvailableMemory()
{
#ifdef _WIN32
    MEMORYSTATUSEX statex;
    statex.dwLength = sizeof(statex);
    if (!GlobalMemoryStatusEx(&statex))
        return 0;
    return (size_t)statex.ullAvailPhys;
#elif defined(__APPLE__)
    mach_msg_type_number_t count = HOST_VM_INFO_COUNT;
    vm_statistics_data_t   vmstat;
    if (host_statistics(mach_host_self(), HOST_VM_INFO, (host_info_t)&vmstat, &count) != KERN_SUCCESS)
        return 0;
 
    natural_t available_pages = vmstat.free_count + vmstat.inactive_count;
    vm_size_t page_size;
    host_page_size(mach_host_self(), &page_size);
 
    return (size_t)available_pages * (size_t)page_size;
#else
    long pages = sysconf(_SC_AVPHYS_PAGES);
    long page_size = sysconf(_SC_PAGESIZE);
    if (pages == -1 || page_size == -1)
        return 0;
    return (size_t)pages * (size_t)page_size;
#endif
}