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always taken from a special stack size header embedded inside the portable executable (PE) image, which is the format for all Windows binaries So any compiler or linker that emits a PE image knows how to set the stack sizes For other threads created during the process's execution, a different stack size argument may be passed explicitly to the thread creation APIs If an override size is not supplied, new threads use the sizes specified in the executable The reverse is true also: changing the stack size header has no affect on threads that are created with an explicitly overridden set of values for the commit and reserve sizes The default reserve size for all of Microsoft's mainstream runtimes (eg, the CLR), linkers (eg, LINKEXE), and compilers (eg, VC++ compiler) is 1 MB The CLR always commits the whole stack memory for managed threads as soon as a managed thread is created, or lazily when a native thread becomes a managed thread This is done to ensure that stack overflow can be dealt with predictably by the execution engine (as examined shortly) Most native Windows linkers and compilers values use just a single page for the default commit size These defaults are just right for most applications It's possible to change the default sizes There are two main reasons this can be useful First, when many threads are created in a process, the default of 1 MB stack per thread can add a considerable amount of virtual memory consumption to the program Second, some programs must run code that uses deeply recursive function calls, or otherwise run into stack overflow problems Typically this should be fixed in the source code, but if you are using a third party or legacy component, increasing the stack size can be a simple workaround If your code ends up hosted inside an existing EXE, you will inherit dif ferent settings For instance, ASPNET uses stack sizes of 256KB to minimize the process-wide stack usage; this was accomplished by modifying the stack settings in the aspnet_wpexe worker process EXE So if you write a Webpage, you'll be running within this constraint
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Changing the PE Stack Sizes In some cases, you might want to change the stack settings yourself, either for the entire EXE or for individual threads that are created If you need to modify the default stack size, then
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you can do s o when you build your EXE Native linkers and compilers typically offer this, while managed code compilers do not For example, the Microsoft LINKEXE linker offers a ISTACK switch, and the VC++ CLEXE compiler offers a IF switch You may also add a STACKSIZE statement to your module definition (DEF) file For instance, here is the format for LINKEXE and CLEXE
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L I N K EXE / STAC K : reserveByt e s , [ c ommitByt e s ] C L EXE I F rese rveByt es
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You also can modify an existing binary with the EDITBINEXE com mand This works for native and managed binaries and is the easiest way to change a managed EXE's default stack sizes because you can' t do it at build time This is also sometimes a useful way to work around a stack overflow problem after a program has been deployed-perhaps due to having to operate on a larger quantity of data than expected-without hav ing to recompile and redeploy a program You specify the reserve and, optionally, the commit bytes via the ISTACK switch
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EDITBIN EX E I STAC K : reserveBytes , [ commitByt e s ]
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Specifying Stack Sizes at Creation Time It's pOSSible to specify stack sizes on a per thread basis In managed code, the System T h r e a d i n g T h r e a d class's constructor provides two overloads that accept a maxSt a c kS i z e parameter As noted earlier, the full stack is committed at creation time for all managed threads, and so the maxSt a c kS i z e parameter represents both the reserve and the commit size: they are effectively the same The Win32 C r eateTh r e a d API's dwSt a c kS i z e parameter can be used to override the default values stored in the executable (For C programs, set ting the st a c k_s i z e parameter for _beg i n t h read or _beg i n t h readex accom plishes the same thing) The stack size argument in this case is a number of bytes and will be automatically rounded up to the nearest page allocation granularity (usually 4KB or 8KB) The value will be used as the commit size, and the reserve size is taken from the PE file; alternatively, if STACK_S I Z E_I S_A_R E S E RVATION is passed in the dwC reat ion F l ags argument (or i n i t f l a g s for _beg i nt h re a d e x ) , the value is used for the reservation size
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