For some targets like ESP32, the ah pool is mainly sitting idle wasting memory.
For HTTP/2, if the client sends a series of pipelined headers on different SIDs
that exist simultaneously, there is no way to stall the headers to wait for an
ah, because we must read the stream for stuff like WINDOW_UPDATE on the other
streams.
In both these cases having the ability to free unused ah completely and allocate
more dynamically if there is memory is useful, so this patch makes the ah pool
an initially-empty linked list that allocates on demand up to the "max pool
size" limit from the context info. When nobody wants an ah, it is freed (if
someone was waiting for it, it is directly reused).
For ESP32 it means no large, permanent alloc when lws starts and dynamic alloc
according to how many streams the client opens, which can be controlled by
SETTINGS.
https://github.com/warmcat/libwebsockets/issues/489
This
1) fixes the vhost changes on master
2) works around the ah pool changes
3) fixes some other build problems that appeared
4) hacks out physical flow control for internal streams
5) updates the advertised protocol to h2 needed by, eg, chrome 51
That gets it able to serve small (<4K, ie, one packet) files over http2
Signed-off-by: Andy Green <andy@warmcat.com>
- Mainly symbol length reduction
- Whitespace clean
- Code refactor for linear flow
- Audit @Context for API docs vs changes
Signed-off-by: Andy Green <andy.green@linaro.org>
This nukes all the oldstyle prefixes except in the compatibility code.
struct libwebsockets becomes struct lws too.
The api docs are updated accordingly as are the READMEs that mention
those apis.
Signed-off-by: Andy Green <andy.green@linaro.org>
This adds npn / alpn support if your openssl can handle it.
Then, browsers that understand alpn will by default
negotiate http/1.1 and work as normal.
Clients that understand http2.0 can negotiate h2-14 and
use the basic but working http2.0 support automatically
Signed-off-by: Andy Green <andy.green@linaro.org>
