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# TCP Sprint # [Will It Blend? - TCP Streams](https://youtu.be/l69Vi5IDc0g)
This script demonstrates the risk of interleaving writes when cloning This script demonstrates the risk of interleaving writes when cloning
`TcpStream` handles across threads, re: `TcpStream` handles across threads, re:
[this discussion in the Servo Zulip](https://servo.zulipchat.com/#narrow/channel/263398-general/topic/TcpStream.3A.3Atry_clone.28.29.20thread.20safety.20in.20devtools/with/578172763). [this discussion in the Servo Zulip](https://servo.zulipchat.com/#narrow/channel/263398-general/topic/TcpStream.3A.3Atry_clone.28.29.20thread.20safety.20in.20devtools/with/578172763).
It works by spawning 3 threads: 2 TCP clients, each of which sends predictable It spawns 3 threads:
chunks of bytes over a shared connection with `TcpStream::write_all()`, and 1 - 2 TCP clients, each of which sends predictable chunks of bytes over a shared
TCP listener, which tests whether messages arrive contiguously or scrambled connection with `TcpStream::write_all()`
together. - 1 TCP listener, which tests whether messages arrive contiguously or scrambled
together
Messages consist of the range `0x00..=0xff`, repeated to fill the desired Messages consist of the range `0x00..=0xff`, repeated to fill the desired
message size. message size. The TCP listener prints a warning if it detects any byte received
out of order.
## Usage ## Usage