MmapAllocator.cpp

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#include <Fw/Types/MmapAllocator.hpp>
#include <cstdlib>
#include <sys/mman.h>
#include <Fw/Types/Assert.hpp>
 
namespace Fw {
 
    MmapAllocator::MmapAllocator() : m_length(0) {
    }
 
    MmapAllocator::~MmapAllocator() {
    }
 
    void *MmapAllocator::allocate(const NATIVE_UINT_TYPE identifier, NATIVE_UINT_TYPE &size, bool& recoverable) {
        void* addr = mmap(nullptr, size, PROT_READ | PROT_WRITE,
                             MAP_SHARED | MAP_ANONYMOUS, -1, 0);
        if (addr == MAP_FAILED) {
            size = 0;
            return nullptr;
        }
        this->m_length = size;
 
        // mmap memory is never recoverable
        recoverable = false;
 
        return addr;
    }
 
    void MmapAllocator::deallocate(const NATIVE_UINT_TYPE identifier, void* ptr) {
        if (this->m_length) {
            int stat = munmap(ptr, this->m_length);
            FW_ASSERT(stat == 0, stat);
        }
    }
 
} /* namespace Fw */