Threading performance optimizations

util/sha3/build.rs

@@ -21,6 +21,6 @@
 extern crate gcc;
 
 fn main() {
-    gcc::compile_library("libtinykeccak.a", &["src/tinykeccak.c"]);
+	gcc::Config::new().file("src/tinykeccak.c").flag("-O3").compile("libtinykeccak.a");
 }
 

util/src/lib.rs

@@ -143,6 +143,7 @@ pub mod network;
 pub mod log;
 pub mod panics;
 pub mod keys;
+mod thread;
 
 pub use common::*;
 pub use misc::*;
@@ -163,4 +164,5 @@ pub use semantic_version::*;
 pub use network::*;
 pub use io::*;
 pub use log::*;
+pub use thread::*;
 

util/src/thread.rs

@@ -0,0 +1,43 @@
+// Copyright 2015, 2016 Ethcore (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Thread management helpers
+
+use libc::{c_int, pthread_self, pthread_t};
+
+#[repr(C)]
+struct sched_param {
+    priority: c_int,
+    padding: c_int,
+}
+
+extern {
+	fn setpriority(which: c_int, who: c_int, prio: c_int) -> c_int;
+	fn pthread_setschedparam(thread: pthread_t, policy: c_int, param: *const sched_param) -> c_int;
+}
+const PRIO_DARWIN_THREAD: c_int = 3;
+const PRIO_DARWIN_BG: c_int = 0x1000;
+const SCHED_RR: c_int = 2;
+
+/// Lower thread priority and put it into background mode
+#[cfg(target_os="macos")]
+pub fn lower_thread_priority() {
+	let sp = sched_param { priority: 0, padding: 0 };
+	if unsafe { pthread_setschedparam(pthread_self(), SCHED_RR, &sp) } == -1 {
+		trace!("Could not decrease thread piority");
+	}
+	//unsafe { setpriority(PRIO_DARWIN_THREAD, 0, PRIO_DARWIN_BG); }
+}