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    <p>Windows does not commit the stack memory immediately; instead, it reserves the address space for it, and commits it page-by-page when it is accessed. Read <a href="http://msdn.microsoft.com/en-us/library/ms686774%28VS.85%29.aspx" rel="noreferrer">this page</a> for more info.</p> <p>As a result, stack address space consists of three contiguous regions:</p> <ul> <li>Reserved but uncommitted memory which can be used for stack growth (but was never accessed yet);</li> <li>Guard page, which was never accessed yet too, and serves to trigger stack growth when accessed;</li> <li>Committed memory, i.e. stack memory which was ever accessed by the thread.</li> </ul> <p>This allows us to construct a function that obtains stack size (with page size granularity):</p> <pre><code>static size_t GetStackUsage() { MEMORY_BASIC_INFORMATION mbi; VirtualQuery(&amp;mbi, &amp;mbi, sizeof(mbi)); // now mbi.AllocationBase = reserved stack memory base address VirtualQuery(mbi.AllocationBase, &amp;mbi, sizeof(mbi)); // now (mbi.BaseAddress, mbi.RegionSize) describe reserved (uncommitted) portion of the stack // skip it VirtualQuery((char*)mbi.BaseAddress + mbi.RegionSize, &amp;mbi, sizeof(mbi)); // now (mbi.BaseAddress, mbi.RegionSize) describe the guard page // skip it VirtualQuery((char*)mbi.BaseAddress + mbi.RegionSize, &amp;mbi, sizeof(mbi)); // now (mbi.BaseAddress, mbi.RegionSize) describe the committed (i.e. accessed) portion of the stack return mbi.RegionSize; } </code></pre> <p>One thing to consider: <code>CreateThread</code> allows to specify initial stack commit size (via <code>dwStackSize</code> parameter, when <code>STACK_SIZE_PARAM_IS_A_RESERVATION</code> flag is not set). If this parameter is nonzero, our function will return correct value only when stack usage becomes greater than <code>dwStackSize</code> value.</p>
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    1. CODoesn't the stack grow down? Why are you adding the RegionSize to the base address instead of subtracting it?
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    2. CO@Philip - The stack does grow down (on x86, at least). I'm adding because `VirtualQuery` returns the base address of memory allocation region - the address of the last (theoretically) usable byte of a downward-growing stack. On a platform with upward-growing stack, the first `VirtualQuery` call would have given the needed result. I guess I could illustrate it with a picture; I'll probably even do it later when I have more time.
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