So let's say I have created a thread, on Windows OS, for which I know that the default stack size is much more than what is needed. Can I then run the application and ask the thread about the amount of stack it actually has used so that I know how much I should set its stack size instead of the default stack size?
Can I ask a running thread about how much stack it has been using?
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Windows usually doesn't commit the entire stack, it only reserves it. (Well, unless you ask it to, e.g. by specifying a non-zero stack size argument for
CreateThreadwithout also passing theSTACK_SIZE_PARAM_IS_A_RESERVATIONflag).You can use this to figure out how much stack your thread has ever needed while running, including any CRT, WinAPI or third-party library calls.
To do that, simply read the
StackBaseandStackLimitvalues from the TEB - see answers to this question for how to do that. The difference of the two values should be the amount of stack memory that has been committed, i.e. - the amount of stack memory that the thread has actually used.Alternatively, if a manual process is sufficient: Simply start the application in WinDBG, set a breakpoint before the thread exits and then dump the TEB with the
!tebcommand. You can also dump the entire memory map with!addressand look for committed areas with usageStack.