![]() Minor change to speed up subsequent mallocs (by using a last-allocated pointer). Metadata and data are kept in separate arrays to minimize the impact of buffer overruns. In short, it's first-fit allocation with fixed-sized pages. The malloc strategy is somewhat saner than the previous version. In particular, I have not tested these functions when the heap has actually depleted, so borderline cases when heap is almost full may start causing bizarre behavior (such as crashing). I have performed only basic correctness test. The functions have not been thoroughly stress-tested. The heap-memory size (malloc arena) is changeable by altering MALLOC_ARENA in qmalloc.h. New Quake III Arena engine boasts spectacular lighting, volumetric fog, curved surfaces, pulse-pounding graphics, and superior internet capabilities all at. This means with a 256KB heap, only a maximum of about 8000 malloc() calls can be made if no free() calls are ever made. One heap-allocated block takes at least 32 bytes. a global variable), and then treated as heap memory. The functions with a return value will return NULL if memory could not be allocated.Ī large array of bytes is allocated in the data segment (i.e. Forces the freeing of allocated blocks on the (fake)alloca ring buffer. This function was added for Ogg Vorbis support. The alloca implementation here fakes alloca by using a global ring buffer to store malloc calls, then free()'s malloc blocks as the ring buffer becomes full.Īll ring-stored blocks are free()d if size is a negative number. This is supposed to act like a malloc with an automagic call to free() at the end of the function. foo = realloc(foo, 1000) ).įrees memory associated with malloc'd pointer ptr. So the return value of realloc() should be reassigned back to the same pointer variable (e.g. The new location may or may not be the same location as ptr, Given old pointer ptr, attempt to resize the block to size bytes.Ĭontent is preserved as much as possible.
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