Implement stream based socket

[heheda12345]

Pass 16/26 of SocketTest

The main fail reasons are:

1. Datagram based socket is not implemented
2. The buffer size of the socket is unlimited

[wangrunji0408]

这个 lock 的作用和目的是啥？

[heheda12345]

同时给自己和peer上锁，以防两个线程同时操作self 和 peer导致的死锁

[wangrunji0408]

我简单看了一下，似乎没发现有同时 lock self 和 peer 的情况。
所以应该可以去掉吧？测试的时候发生过死锁吗？

[wangrunji0408]

是不是用 VecDeque 更好？

[heheda12345]

是的，但是我没找到deque里下面这段代码的对应写法

let data = if options.contains(SocketOptions::PEEK) {
            Vec::from_iter(inner.data[0..size].iter().cloned())
}

[wangrunji0408]

对，因为VecDeque里面是个ringbuffer，不像Vec一样保证数据连续，而是可能分成前后两段。它有一个 as_slices 方法可以干这件事：

pub fn as_slices(&self) -> (&[T], &[T])

就是处理起来稍微麻烦一些（

[heheda12345]

好的，我去改

[coveralls]

Pull Request Test Coverage Report for Build 103839393

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 3 of 497 (0.6%) changed or added relevant lines in 16 files are covered.
• 60 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-1.5%) to 22.176%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
zircon-syscall/src/port.rs	0	1	0.0%
zircon-syscall/src/time.rs	0	3	0.0%
kernel-hal-bare/src/arch/x86_64/mod.rs	0	4	0.0%
zircon-object/src/dev/interrupt/virtual_interrupt.rs	0	6	0.0%
zircon-object/src/signal/port_packet.rs	0	6	0.0%
zircon-object/src/task/thread.rs	0	7	0.0%
kernel-hal/src/dummy.rs	0	8	0.0%
zircon-object/src/dev/resource.rs	0	12	0.0%
kernel-hal-bare/src/arch/x86_64/interrupt.rs	0	23	0.0%
zircon-object/src/dev/interrupt/event_interrupt.rs	0	24	0.0%

Files with Coverage Reduction	New Missed Lines	%
zircon-object/src/signal/port_packet.rs	1	24.39%
zircon-object/src/signal/port.rs	1	22.92%
kernel-hal-bare/src/arch/x86_64/mod.rs	5	0.0%
kernel-hal-bare/src/arch/x86_64/interrupt.rs	21	0.0%
../../../../../usr/share/rust/.cargo/registry/src/github.com-1ecc6299db9ec823/numeric-enum-macro-0.2.0/src/lib.rs	32	0.0%

Totals
Change from base Build 102173235:	-1.5%
Covered Lines:	1702
Relevant Lines:	7675

---

💛 - Coveralls