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Critical sections are often statically associated with fragments of the pro gram logic, in which case it is usually most convenient to allocate your C R IT I CA L_S ECTION in the program's statically allocated memory This cor responds nicely to coarse-grained locking, as per previous discussion This usually means defining a C++ class static field or a global variable of type C R I T ICAL_S ECTION and placing initialization logic into your program's startup logic or DLL's main function for library code Such statically
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allocated locks are typically used to protect large portions of the program, which are comprised primarily of static or global state This corresponds to coarse-grained locking (see 2, Synchronization and Time) In other cases, a critical section may be associated with a dynamically allocated data structure, such as a critical section per node in a tree data structure, in which case the C R I T I CA L_S ECT ION is typically allocated as a member inside the data structure's memory In some cases, such a critical section is considered coarse-grained, for example, if it protects a larger col lection of data, while in many cases dynamic allocation is used to produce finer-grained locks that are attached to individual bits of data For example, if we had a tree data structure, we might allocate a single lock to protect all nodes, that is, coarse-grained locking; or we may wish to allow fine-grained locking of individual nodes by giving each its own critical section Notice that in neither example was the C R I T ICA L_S ECTION object referred to by a pointer This is common-that is, allocating the critical section "inline," either in static or dynamic data-although you can alternatively allocate and free the C R I T I CA L_S E C T I ON objects dynamically via m a l loc J f r e e J n ew, and / or d e l e t e This decision is entirely in your hands The only hard requirement is that you never copy or attempt to move the critical region's memory after initialization The implementation of critical sections assumes the address of the data structure remains con stant and uses its address as the key into some internal OS data structures Address movement can cause some undesirable things to happen to your program, ranging from crashes to data corruption When allocating a critical section embedded within a data structure, you might worry about the size of the section because it bloats the data struc ture As of Windows Vista, a C R I T ICA L_S E CTION object is 24 bytes on 32-bit architectures and 40 bytes on 64-bit systems The variance is due to some internal pointer-sized information such as handles The size is apt to change from release to release and even on different architectures, so you should certainly never depend on it Nevertheless, it can at least be used as a guide line to help decide whether to use fine- or coarse-grained locks
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Because a critical region holds on to kernel resources internally and demands specific initialization and data layout, you must initialize each critical section
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before i t i s first used This i s accomplished via the I n i t i a l i zeC ri t ica lSection function or the I n it i a l i zeCrit i c a lSect ionAndSpi nCount function, which can be used to control the spin waits used by the section There is also an I n i t i a l i z eC r i t i c a lSect ion E x function that is new in Windows Vista To avoid leaking resources, you must call the De l eteC r it i c a lSection function once you no longer need to use the section The signatures for these functions are as follows
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VOID WINAPI I n i t i a l ize C r it i c a lSection ( l P C R I T I CAl_S ECTION I p C r i t i c a lSection
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)j VOI D WINAPI I n i t i a l i ze C r i t i c a lSect ionAnd S p i nCount ( l P C R I T I CAl_SECTION I p C r it i c a lS e c t ion , DWORD dwS p i nCount
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)j BOOl WINAPI I n i t i a l i z eC r it i c a lS e c t i on E x ( lPCRITICAl_SECTION I p C r i t i c a lSection, DWORD dwS p i nCount , DWORD F l a g s j ) VOI D WINAPI DeleteC r it i c a lSect ion ( l P C R I T I CAl_SECTION I p C r it i c a lSection
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Each takes a pointer to the memory location containing a C R I T I CA L_S E C T ION to initialize or delete We'll discuss the dwS p i n C o u n t arguments for I n i t i a l i z e C r i t i c a l S e c t i o n An d S p i n C o u n t and I n i t i a l
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