'What is an address/range of addresses that are guaranteed to be not used in x86-64?

I am writing a version of malloc that is compatible with multi-threading. Is is going to use arenas to help facilitate the parallelism.

mmap is being used to create the arenas. Using NULL as the input address to mmap is not working. Is there a range of addresses that is basically guaranteed to be free in x86-64?

operating-systemmallocx86-64cpu-architecturelow-level


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