* use string_view for on_message

* use string_view for msg_sender

* use wait_free(1) in sender

* simplify write logic

* fix bug: wait size larger than buffer size

* bump version to v0.3.0

* Create codeql.yml

* return sender by OnConnect callback

* update tests

* Connection friend MsgSender

* ignore all level of .idea

* use substr api of string_view in try_send

* fast return on empty bytes in send_block api

* add submodule concurrentqueue

* add an echo-server example

* return sender by OnConnect callback

* update tests

* Connection friend MsgSender

* ignore all level of .idea

* use substr api of string_view in try_send

* fast return on empty bytes in send_block api

* add submodule concurrentqueue

* add submodule concurrentqueue

* add an echo-server example

* fix an integer cast error

* allow on_msg to suspend thus providing back pressure and etc.

* fix fall through bug

* update tests to async on_message api

* make the old api compatible

* Revert "update tests to async on_message api"

This reverts commit 7aa91dd.

* make the old api compatible (fix)

* fix missing recv_waker.h

* make receiver use shared_ptr for better sharing

* add a PENDING const in socket_manager

* move a RcvWaker to reduce allocation receiving message

* fix copy move semantics

* remove allocation in recv_waker

* separate Waker class to send_waker.h

* add a NoopWaker

* use unique_ptr instead of raw pointers

* make waker methods private

* correctly define move semantics for recv_waker

* simplify echo server with new API

* add empty RcvWaker

* reduce allocation in echo server example

* remove unused import

* clean aftermerge

* remove unused example header

* clear up after merging

* move submodule queue to tests

* add some comment about connect_to_addr

* add doc for recv_waker.h

* rename waker for sender to SendWaker

* add fmt and clippy

* rename RcvWaker to RecvWaker

* doc recv_waker.rs

* some renaming for connection.rs

* renaming msg_sender c_api

* return 1 instead of -1 to represent error

* rename waker and notifier

* document async_api module

* simplify the async send api algorithm

* refactor callbacks and extern_c.rs

* cargo fmt

* inline some async_ffi functions

* cargo fmt

* simplify Optional flush duration logic

* fix a clippy warning in notifier

* document async control flow of send and receive

* generate the new c header

* add doc for msg_receiver.h

* rename recv_waker to waker

* default notifier clone/release to noop

* rename CMsgSender to MsgSender

* rename NoopWaker to NoopNotifier

* fix renaming CMsgSender

* updating msg_sender interface

* update connection h/cc

* rename CSocketManager to SocketManager

* update socket_manager h/cc

* rename recv_waker in ffi

* update conn_callback.h

* update c_api impl

* update tests

* remove busy loop test

* unify block async send logic

* fix CMakeLists.txt

* move registration of notifier to start of connection

* fix cmake include issue

* clarify noop empty waker

* update tests and examples

* fix potential async test deadlock

* improve header doc

* remove shared_from_this of connection.h

* documenting socket_manager.h memory behavior

* update the echo_server example to fix memory leak

* add note on Waker resource management

* add instructions on memory model

* fix the test where send_block might through exception

* Add CI for building examples

* fix CI macos brew env

* remove a mis-comment

* refactor msg-sender source code

* use cbindgen for c++

* implement send_nonblock by chained ring_buf

* implement c++ interface for send_nonblock

* add tests for send_nonblock

* flush if break on sender cmd=None

* fix compile bug

* remove perf comment