Re: new and delete from different threads

From:

Ulrich Eckhardt <eckhardt@satorlaser.com>

Newsgroups:

microsoft.public.vc.language

Date:

Tue, 09 May 2006 16:18:19 +0200

Message-ID:

<buk6j3-pdh.ln1@satorlaser.homedns.org>

Dilip wrote:

struct GenericPointerDeleter
{
    template<typename T>
    void operator()(T* p)
    {
        if (ptr != 0)
        {
            delete ptr;
            ptr = 0;
        }
    }
};

- 'ptr', undeclared identifier, you mean 'p'.
- No need to check for zero before invoking delete.
- 'ptr' is a local variable, no use to zero it.

{
    vecptrs myptrs;
    CreateThread(...... (LPVOID)&myptrs........);
    // use some platform specific API to wait until
       threadcallbackroutine terminates
    pseudo_wait_for_terminate(threadcallbackroutine);

    for_each(myptrs.begin(), myptrs.end(), GenericPointerDeleter());
}

DWORD WINAPI threadcallbackroutine(LPVOID param)
{
    vecptrs* my_ptrs = static_cast<vecptrs*>(param);
    my_ptrs->push_back(new classofpointers());
    return 0;
}

I have vastly simplified what is essentially happening in my
application...

Should I be careful about new'ing and deleting from the same thread?

You mean from different threads ;)

No, that is a typical producer-consumer scenario and well supported.

Uli