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#include "memlog.h"
#if defined(_unix_)
#include <sys/mman.h>
#elif defined(_win_)
#include <util/system/winint.h>
#else
#error NO IMPLEMENTATION FOR THE PLATFORM
#endif
void TMemoryLog::TMMapArea::MMap(size_t amount) {
Y_VERIFY(amount > 0);
#if defined(_unix_)
constexpr int mmapProt = PROT_READ | PROT_WRITE;
#if defined(_linux_)
constexpr int mmapFlags = MAP_PRIVATE | MAP_ANON | MAP_POPULATE;
#else
constexpr int mmapFlags = MAP_PRIVATE | MAP_ANON;
#endif
BufPtr = ::mmap(nullptr, amount, mmapProt, mmapFlags, -1, 0);
if (BufPtr == MAP_FAILED) {
throw std::bad_alloc();
}
#elif defined(_win_)
Mapping = ::CreateFileMapping(
(HANDLE)-1, nullptr, PAGE_READWRITE, 0, amount, nullptr);
if (Mapping == NULL) {
throw std::bad_alloc();
}
BufPtr = ::MapViewOfFile(Mapping, FILE_MAP_WRITE, 0, 0, amount);
if (BufPtr == NULL) {
throw std::bad_alloc();
}
#endif
Size = amount;
}
void TMemoryLog::TMMapArea::MUnmap() {
if (BufPtr == nullptr) {
return;
}
#if defined(_unix_)
int result = ::munmap(BufPtr, Size);
Y_VERIFY(result == 0);
#elif defined(_win_)
BOOL result = ::UnmapViewOfFile(BufPtr);
Y_VERIFY(result != 0);
result = ::CloseHandle(Mapping);
Y_VERIFY(result != 0);
Mapping = 0;
#endif
BufPtr = nullptr;
Size = 0;
}
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