What is the best way to reallocate memory for char array?

Maxim Dounin mdounin at mdounin.ru
Mon Nov 17 14:48:18 UTC 2014


On Mon, Nov 17, 2014 at 09:35:18AM -0500, kay wrote:

> Thanks.
> Is it necessary to use ngx_pfree(str) at the end of my function?

As long as you allocate memory from a pool, it's not required to 
free the memory explicitly via ngx_pfree().  Memory will be 
freed automatically on the pool destruction.  Moreover, in most 
cases ngx_pfree() will not be able to do anything as it can only 
free large blocks of memory.

The ngx_pfree() function is only useable in some special cases 
when you have to free large blocks of memory before the pool will 
be destroyed.  For example, nginx uses ngx_pfree() to free 
connection's buffer memory for idle keepalive connections, see 

Maxim Dounin

More information about the nginx mailing list