Why do these mprotect always fail?

[w6b7rk5yu4mt25v3 via Cygwin]

mprotect 1:

    unsigned char* buffer;
    int32_t available, size;

      if(size > PAGE_SIZE) {
        factor = size / PAGE_SIZE + 1;
      }
      available = factor * PAGE_SIZE;

      if(posix_memalign((void**)&buffer, PAGE_SIZE, available)) {
        std::wcerr << L"Unable to allocate JIT memory!" << std::endl;
        exit(1);
      }
      if(mprotect(buffer, available, PROT_READ | PROT_WRITE | PROT_EXEC) < 0) {
        std::wcerr << L"Unable to mprotect" << std::endl;
        exit(1);
      }

mprotect 2:

  if(posix_memalign((void**)& buffer, PAGE_SIZE, PAGE_SIZE)) {
    std::wcerr << L"Unable to allocate JIT memory!" << std::endl;
    exit(1);
  }

  if(mprotect(buffer, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC) < 0) {
    std::wcerr << L"Unable to mprotect" << std::endl;
    exit(1);
  }


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