Changed ngx_chain_update_chains() to test tag first (ticket #2248). Without this change, aio used with HTTP/2 can result in connection hang, as observed with "aio threads; aio_write on;" and proxying (ticket #2248). The problem is that HTTP/2 updates buffers outside of the output filters (notably, marks them as sent), and then posts a write event to call output filters. If a filter does not call the next one for some reason (for example, because of an AIO operation in progress), this might result in a state when the owner of a buffer already called ngx_chain_update_chains() and can reuse the buffer, while the same buffer is still sitting in the busy chain of some other filter. In the particular case a buffer was sitting in output chain's ctx->busy, and was reused by event pipe. Output chain's ctx->busy was permanently blocked by it, and this resulted in connection hang. Fix is to change ngx_chain_update_chains() to skip buffers from other modules unconditionally, without trying to wait for these buffers to become empty.

# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


all:
	cd $(OPENSSL)

	perl Configure VC-WIN32 no-shared				\
		--prefix="%cd%/openssl" 				\
		--openssldir="%cd%/openssl/ssl" 			\
		$(OPENSSL_OPT)

	if exist ms\do_ms.bat (						\
		ms\do_ms						\
		&& $(MAKE) -f ms\nt.mak					\
		&& $(MAKE) -f ms\nt.mak install				\
	) else (							\
		$(MAKE)							\
		&& $(MAKE) install_sw					\
	)