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arena -- Definition An arena is the area of memory that is available for a program to allocate dynamically at run time. It is divided into allocated and unallocated blocks. The unallocated blocks together form the ``free-memory pool''. To allocate a portion of the arena, use any of the functions malloc(), calloc(), or realloc(). To return an allocated portion of memory to the free-memory pool, use the function free(). To check whether a given portion of the arena is already allocated, use the function notmem(). To check whether the arena has been corrupted, use the function memok(). See Also calloc(), free(), malloc(), memok(), notmem(), Programming COHERENT, realloc()