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Reading, Stall) If you decide to adopt fibers in your program, you will also have to bring a lot of knowledge about internal data structures, how to access them, and how to interpret the layout of these structures
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Many of these drawbacks are serious If you've gotten the impression that fibers are not appropriate for extensible systems (most systems), then you have been given the intended impression Despite all these words of warn ing, fibers do have their place-for highly scalable and closed systems that either carefully control extensibility points or don't have any With care, they can also be used to implement scalable dynamic work schedulers and useful abstractions such as coroutines and agents-like simulations
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Now that we' ve reviewed the highlights and lowlights of using fibers, let's review the mechanisms for using them Everything shown will be in C++ and Win32 We'll return to some additional design topics later, in addition to looking at an implementation of a very simple fiber based cooperative VMS
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Creating New Fibers A fiber is created much like a thread, with the Kernel32 function C r e at e F i b e r or, a s o f Windows X P or 2000 SP4 (and Windows Server 2003 and Vista), C reate F i be r E x
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L PVOID WINAPI C reat e F i ber ( S I Z E_T dwSt a c k S i z e , L P F I B E R_START_ROUTINE IpSta rtAdd re s s , L PVOID IpPa ramet e r )j L PVOID WINAPI C reate F i berEx ( S I Z E_T dwSt a c kCommit S i z e , S I Z E_T dwSt a c k R e s erveS i z e , DWORD dwF lags , L P F I B E R_START_ROUTINE I p S t a rtAd d re s s , L PVOID IpPa ramet e r )j
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You'll notice that C re ate F i b e r looks a lot like C reateTh read, so most of the arguments to this API are probably obvious Note that because fibers were added in a Windows NT 35 service pack, you must define the _WI N 3 2_WI N NT symbol to be axa4aa or higher before including W i n dows h to access any of the functions we'll review in this chapter I pS t a rtAd d r e s s refers to the function at which the fiber will begin execution
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Unlike thread start routines that return a DWORD exit code, a fiber's start routine doesn't return anything That's because a fiber doesn't have an exit code as a thread does The I p P a ramet e r argument to C re at e F i b e r and C re at e F i be r E x is passed to the start routine as its I p P a ramet e r argument Its purpose is the same as with C reateTh r e a d : it enables the creating thread to pass arbitrary data to the callback During fiber creation, a new user-mode stack will be allocated The dwS t a c k S i z e parameter to C r e a t e F i b e r is interpreted the same way as C r e a t e T h r e a d 's dwSt a c k S i z e parameter: that is, a for the default stack size, taken from the current executable, and the commit (rather than reservation) size otherwise There is no way to specify an alternative reserve size with C r e a t e F i b e r Instead, you must use the C r e a t e F i b e r E x API, which allows you t o specify reservation and commit sizes a s inde pendent arguments: dwSt a c k C o m m i t S i z e specifies how many bytes to commit and dwSt a c k R e s e r v e S i z e specifies the number of bytes to reserve Either of these arguments can be a, which indicates that the default value for that particular value should be taken from the process If both are specified, the reserve size must equal or exceed the commit size (Please refer to the section on thread stacks in 4, Advanced Threads, for a detailed description of the differences between reserved and committed virtual memory, the layout of stacks, and so on User-mode stacks for fibers are treated the same as with threads: the fiber implemen tation allocates, manages, and swaps the target thread's stack with the new fiber 's without requiring kernel support by using a combination of docu mented and undocumented APIs)
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