Add an --no-stdin option to prevent z_sub_thr from reading early EOF

examples/examples/z_sub_thr.rs

@@ -13,7 +13,7 @@
 //
 use clap::Parser;
 use std::io::{stdin, Read};
-use std::time::Instant;
+use std::time::{Duration, Instant};
 use zenoh::config::Config;
 use zenoh::prelude::sync::*;
 use zenoh_examples::CommonArgs;
@@ -72,7 +72,7 @@ fn main() {
     // initiate logging
     env_logger::init();
 
-    let (mut config, m, n) = parse_args();
+    let (mut config, m, n, no_stdin) = parse_args();
 
     // A probing procedure for shared memory is performed upon session opening. To enable `z_pub_shm_thr` to operate
     // over shared memory (and to not fallback on network mode), shared memory needs to be enabled also on the
@@ -95,10 +95,16 @@ fn main() {
         .res()
         .unwrap();
 
-    for byte in stdin().bytes() {
-        match byte {
-            Ok(b'q') => break,
-            _ => std::thread::yield_now(),
+    if no_stdin {
+        loop {
+            std::thread::park();
+        }
+    } else {
+        for byte in stdin().bytes() {
+            match byte {
+                Ok(b'q') => break,
+                _ => std::thread::yield_now(),
+            }
         }
     }
 }
@@ -111,11 +117,14 @@ struct Args {
     #[arg(short, long, default_value = "100000")]
     /// Number of messages in each throughput measurements.
     number: usize,
+    /// Do not read standard input.
+    #[arg(long)]
+    no_stdin: bool,
     #[command(flatten)]
     common: CommonArgs,
 }
 
-fn parse_args() -> (Config, usize, usize) {
+fn parse_args() -> (Config, usize, usize, bool) {
     let args = Args::parse();
-    (args.common.into(), args.samples, args.number)
+    (args.common.into(), args.samples, args.number, args.no_stdin)
 }