From c9cb50b5794cfbb50114e2fe806bbfe5d6f24df6 Mon Sep 17 00:00:00 2001
From: Sean Cross <sean@xobs.io>
Date: Wed, 30 Dec 2020 16:50:28 +0800
Subject: [PATCH] kernel: use crossbeam-channel internally

This provides better performance than MPSC.

Signed-off-by: Sean Cross <sean@xobs.io>
---
 kernel/Cargo.lock | 38 ++++++++++++++++++++++++++++++++++++--
 kernel/Cargo.toml |  5 +++--
 2 files changed, 39 insertions(+), 4 deletions(-)

diff --git a/kernel/Cargo.lock b/kernel/Cargo.lock
index 8644d6bb7..5b59cf914 100644
--- a/kernel/Cargo.lock
+++ b/kernel/Cargo.lock
@@ -41,6 +41,12 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
 [[package]]
 name = "backtrace"
 version = "0.3.50"
@@ -48,7 +54,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "46254cf2fdcdf1badb5934448c1bcbe046a56537b3987d96c51a7afc5d03f293"
 dependencies = [
  "addr2line",
- "cfg-if",
+ "cfg-if 0.1.10",
  "libc",
  "miniz_oxide",
  "object",
@@ -115,6 +121,12 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
 [[package]]
 name = "clap"
 version = "2.33.3"
@@ -130,6 +142,27 @@ dependencies = [
  "vec_map",
 ]
 
+[[package]]
+name = "crossbeam-channel"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dca26ee1f8d361640700bde38b2c37d8c22b3ce2d360e1fc1c74ea4b0aa7d775"
+dependencies = [
+ "cfg-if 1.0.0",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "02d96d1e189ef58269ebe5b97953da3274d83a93af647c2ddd6f9dab28cedb8d"
+dependencies = [
+ "autocfg",
+ "cfg-if 1.0.0",
+ "lazy_static",
+]
+
 [[package]]
 name = "debug-here"
 version = "0.2.2"
@@ -174,7 +207,7 @@ version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7abc8dd8451921606d809ba32e95b6111925cd2906060d2dcc29c070220503eb"
 dependencies = [
- "cfg-if",
+ "cfg-if 0.1.10",
  "libc",
  "wasi",
 ]
@@ -211,6 +244,7 @@ name = "kernel"
 version = "0.1.0"
 dependencies = [
  "bitflags",
+ "crossbeam-channel",
  "debug-here",
  "hex",
  "lazy_static",
diff --git a/kernel/Cargo.toml b/kernel/Cargo.toml
index 6bb7cc32f..248e0a12b 100644
--- a/kernel/Cargo.toml
+++ b/kernel/Cargo.toml
@@ -21,14 +21,15 @@ riscv = "0.5.6"
 debug-print = []
 print-panics = []
 report-memory = ["stats_alloc"]
-#default = ["print-panics", "debug-print"]
-default = []
+default = ["print-panics", "debug-print"]
+# default = []
 
 [target.'cfg(any(windows, unix))'.dependencies]
 lazy_static = "1.4"
 rand = "0.7"
 hex = "0.4"
 debug-here = "0.2.2"
+crossbeam-channel = "0.5"
 
 [profile.release]
 codegen-units = 1 # 1 better optimizations