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1a0b5f33b3
cmake/target.cmake defines macros for the supported platforms, this commit changes predefined system macros to our own macros. __linux__ --> OS_LINUX __APPLE__ --> OS_DARWIN __FreeBSD__ --> OS_FREEBSD
45 lines
1.0 KiB
C++
45 lines
1.0 KiB
C++
#include <stdexcept>
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#include <fstream>
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#include <base/getAvailableMemoryAmount.h>
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#include <base/getPageSize.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#if defined(BSD)
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#include <sys/sysctl.h>
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#include <sys/vmmeter.h>
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#endif
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uint64_t getAvailableMemoryAmountOrZero()
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{
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#if defined(_SC_PHYS_PAGES) // linux
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return getPageSize() * sysconf(_SC_PHYS_PAGES);
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#elif defined(OS_FREEBSD)
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struct vmtotal vmt;
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size_t vmt_size = sizeof(vmt);
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if (sysctlbyname("vm.vmtotal", &vmt, &vmt_size, NULL, 0) == 0)
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return getPageSize() * vmt.t_avm;
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else
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return 0;
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#else // darwin
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unsigned int usermem;
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size_t len = sizeof(usermem);
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static int mib[2] = { CTL_HW, HW_USERMEM };
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if (sysctl(mib, 2, &usermem, &len, nullptr, 0) == 0 && len == sizeof(usermem))
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return usermem;
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else
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return 0;
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#endif
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}
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uint64_t getAvailableMemoryAmount()
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{
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auto res = getAvailableMemoryAmountOrZero();
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if (!res)
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throw std::runtime_error("Cannot determine available memory amount");
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return res;
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}
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