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Asked: 2026-05-26T18:03:17+00:00

I am reading a book Efficient C++: Performance Programming Techniques Authors is saying following

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I am reading a book Efficient C++: Performance Programming Techniques Authors is saying following regarding global new and delete operators:

They manage memory in the process context, and since a process may
spawn multiple threads, new() and delete() must be able to operate in
a multithreaded environment. In addition, the size of memory requests
may vary from one request to the next.

in Chapter 6. Single-Threaded Memory Pooling.

Is this true? I thought C++ does not have a notion of a Multi-threading environment, programmer need to handle is by using some means of mutual exclusion.

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  1. Editorial Team

    It will depend on implementation. For example, Visual C++ runtime had both a single-threaded and a multithreaded version of heap in earlier version, but starting with Visual C++ 2005 it only has a multithreaded version. This MSDN article has a nice summary table.

    When a multithreaded heap is used calls to memory allocation and deallocation are thread-safe at expense of additional overhead.

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