net: fix non-blocking read/write

[kbkpbot]

Adding set_blocking(true) to net.dial_tcp(), net.dial_tcp_with_bind(), net.accept().
This will ensure that the upper net apps do not need to modify.

For non-blocking usage, after create a TCPConn via net.dial_tcp(), net.dial_tcp_with_bind(), net.accept(), should use set_blocking(false) change to non-blocking mode.

Both blocking/non-blocking apps can use the same read/write now.

[kbkpbot]

Why I can't see the full log of FreeBSD Code CI ?
https://github.com/vlang/v/pull/20438/checks?check_run_id=20289394271

[spytheman]

Why I can't see the full log of FreeBSD Code CI ? https://github.com/vlang/v/pull/20438/checks?check_run_id=20289394271

See it here: https://cirrus-ci.com/task/4822104995004416 (it is linked at the bottom of the CI check page).

[hholst80]

I can test this later this afternoon on FreeBSD and Alpine without ipv6 and comment. I would like to avoid the call to set_blocking(true) if possible and have it be blocking by default.

[Casper64]

If the default behaviour is changed from non-blocking to blocking sockets it should add conn.set_blocking(false) for code that depends on non-blocking sockets. For example the picoev and x.vweb modules will break after this is merged.

[kbkpbot]

If the default behaviour is changed from non-blocking to blocking sockets it should add conn.set_blocking(false) for code that depends on non-blocking sockets. For example the picoev and x.vweb modules will break after this is merged.

TcpSocket is still non-blocking default.
Only the TcpConn, after calling .accept(), .dial_tcp_with_bind(), .dial_tcp(), will become blocking.

Because vweb call .accept_only(), it should add conn.set_blocking(true) manually .

[spytheman]

@kbkpbot I've merged #20472 . If you rebase, I think it may fix part of the CI fail on FreeBSD.

[spytheman]

(rebased over master, should solve FreeBSD failure)

[kbkpbot]

I think this patch is done....