MmapAllocator.cpp

Go to the documentation of this file.

 
#include <sys/mman.h>
#include <Fw/Types/Assert.hpp>
#include <Fw/Types/MmapAllocator.hpp>
#include <cstdlib>
 
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 */