CODEWITHSUNDEEP
c++
damule
damule

Reputation: 255

Eliminate warning "construction of local static object is not thread-safe"

I have the following class:

struct globalAllocated 
{
    void operator delete(void*p)
    {
        static HANDLE heap= GetHeap();
        ::HeapFree(heap, 0, p);
    }
}

warning C4640: 'heap' : construction of local static object is not thread-safe

I thought about using some synchronization with mutex but it seems costly.

Making the heap a private member won't work because the operator delete override must be static, so heap must be private- but if I declare it as a static class member, there is no where for me to initialize it.

What's the best solution?

Upvotes: 1

Views: 634

Answers (1)

James Kanze
James Kanze

Reputation: 153919

If you can use C++11, it's required to be thread-safe there. (But that could easily be implemented by using a mutex as well, if you're concerned about performance issues.)

More generally: try to ensure that the function is called before multiple threads are started. (In many applications, all that is needed is to call it somewhere in the initialization of a static object.)

Upvotes: 2

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