The nng_msg_realloc() function re-allocates a message so that it has
a body of length size.
This message attempts to avoid extra allocations,
and will reuse the existing memory when possible.
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Tip
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One way to further reduce message allocations is to allocate a message
larger than needed, then use this function or
nng_msg_chop() to reduce the message size
to that actually needed.
The extra space left
over will still be present in the message, so that when the message size
needs to grow due to this function or nng_msg_append()
no actual memory allocations need to take place.
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Note
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Pointers to message body and header content obtained prior to this function must not be in use, as the underlying memory used for the message may have changed, particularly if the message size is increasing. |