convert std::sync::mpsc to crossbeam_channel (#22264)

core/benches/banking_stage.rs

@@ -4,7 +4,7 @@
 extern crate test;
 
 use {
-    crossbeam_channel::unbounded,
+    crossbeam_channel::{unbounded, Receiver},
     log::*,
     rand::{thread_rng, Rng},
     rayon::prelude::*,
@@ -37,7 +37,7 @@ use {
     solana_streamer::socket::SocketAddrSpace,
     std::{
         collections::VecDeque,
-        sync::{atomic::Ordering, mpsc::Receiver, Arc, RwLock},
+        sync::{atomic::Ordering, Arc, RwLock},
         time::{Duration, Instant},
     },
     test::Bencher,

core/benches/retransmit_stage.rs

@@ -4,6 +4,7 @@ extern crate solana_core;
 extern crate test;
 
 use {
+    crossbeam_channel::unbounded,
     log::*,
     solana_core::retransmit_stage::retransmitter,
     solana_entry::entry::Entry,
@@ -30,7 +31,6 @@ use {
         net::UdpSocket,
         sync::{
             atomic::{AtomicUsize, Ordering},
-            mpsc::channel,
             Arc, RwLock,
         },
         thread::{sleep, Builder},
@@ -77,7 +77,7 @@ fn bench_retransmitter(bencher: &mut Bencher) {
     let bank_forks = BankForks::new(bank0);
     let bank = bank_forks.working_bank();
     let bank_forks = Arc::new(RwLock::new(bank_forks));
-    let (shreds_sender, shreds_receiver) = channel();
+    let (shreds_sender, shreds_receiver) = unbounded();
     const NUM_THREADS: usize = 2;
     let sockets = (0..NUM_THREADS)
         .map(|_| UdpSocket::bind("0.0.0.0:0").unwrap())

core/benches/sigverify_stage.rs

@@ -15,10 +15,7 @@ use {
         system_transaction,
         timing::duration_as_ms,
     },
-    std::{
-        sync::mpsc::channel,
-        time::{Duration, Instant},
-    },
+    std::time::{Duration, Instant},
     test::Bencher,
 };
 
@@ -63,7 +60,7 @@ fn bench_packet_discard(bencher: &mut Bencher) {
 #[bench]
 fn bench_sigverify_stage(bencher: &mut Bencher) {
     solana_logger::setup();
-    let (packet_s, packet_r) = channel();
+    let (packet_s, packet_r) = unbounded();
     let (verified_s, verified_r) = unbounded();
     let verifier = TransactionSigVerifier::default();
     let stage = SigVerifyStage::new(packet_r, verified_s, verifier);