Core: changed ngx_queue_sort() to use merge sort. This improves nginx startup times significantly when using very large number of locations due to computational complexity of the sorting algorithm being used: insertion sort is O(n*n) on average, while merge sort is O(n*log(n)). In particular, in a test configuration with 20k locations total startup time is reduced from 8 seconds to 0.9 seconds. Prodded by Yusuke Nojima, https://mailman.nginx.org/pipermail/nginx-devel/2023-September/NUL3Y2FPPFSHMPTFTL65KXSXNTX3NQMK.html

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_PARSE_TIME_H_INCLUDED_
#define _NGX_PARSE_TIME_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


time_t ngx_parse_http_time(u_char *value, size_t len);

/* compatibility */
#define ngx_http_parse_time(value, len)  ngx_parse_http_time(value, len)


#endif /* _NGX_PARSE_TIME_H_INCLUDED_ */