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Ruby Programming
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Memory Allocation

You may sometimes need to allocate memory in an extension that won't be used for object storage---perhaps you've got a giant bitmap for a Bloom filter, or an image, or a whole bunch of little structures that Ruby doesn't use directly.

In order to work correctly with the garbage collector, you should use the following memory allocation routines. These routines do a little bit more work than the standard malloc. For instance, if ALLOC_N determines that it cannot allocate the desired amount of memory, it will invoke the garbage collector to try to reclaim some space. It will raise a NoMemError if it can't or if the requested amount of memory is invalid.

Memory Allocation
type * ALLOC_N(c-type, n")
Allocates n c-type objects, where c-type is the literal name of the C type, not a variable of that type.
type * ALLOC(c-type")
Allocates a c-type and casts the result to a pointer of that type.
REALLOC_N(var, c-type, n")
Reallocates n c-types and assigns the result to var, a pointer to a c-type.
type * ALLOCA_N(c-type, n")
Allocates memory for n objects of c-type on the stack---this memory will be automatically freed when the function that invokes ALLOCA_N returns.
Ruby Programming
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