refactor/features: replace StaticMutex

Replace StaticMutex by the stable `lazy_static!`

Cargo.toml

@@ -21,6 +21,7 @@ rblas = "0.0.10"
 enum_primitive = "0.1.0"
 byteorder = "0.4"
 num = "0.1"
+lazy_static = "0.1.15"
 
 clippy = { version = "0.0.27", optional = true }
 

src/frameworks/opencl/api/platform.rs

@@ -6,7 +6,7 @@ use super::types as cl;
 use super::ffi::*;
 use std::ptr;
 use std::iter::repeat;
-use std::sync::{StaticMutex, MUTEX_INIT};
+use std::sync::Mutex;
 
 impl API {
     /// Returns a list of available platforms.
@@ -22,7 +22,9 @@ impl API {
         // This mutex is used to work around weak OpenCL implementations.
         // On some implementations concurrent calls to clGetPlatformIDs
         // will cause the implantation to return invalid status.
-        static mut platforms_mutex: StaticMutex = MUTEX_INIT;
+        lazy_static! {
+            static ref platforms_mutex: Mutex<()> = Mutex::new(());
+        }
 
         let guard = unsafe {platforms_mutex.lock()};
         try!(unsafe {API::ffi_get_platform_ids(0, ptr::null_mut(), (&mut num_platforms))});

src/lib.rs

@@ -134,7 +134,6 @@
 #![cfg_attr(lint, feature(plugin))]
 #![cfg_attr(lint, plugin(clippy))]
 #![allow(dead_code)]
-#![feature(static_mutex)]
 #![deny(missing_docs,
         missing_debug_implementations, missing_copy_implementations,
         trivial_casts, trivial_numeric_casts,
@@ -145,6 +144,8 @@ extern crate libc;
 extern crate bitflags;
 #[macro_use]
 extern crate enum_primitive;
+#[macro_use]
+extern crate lazy_static;
 extern crate num;
 extern crate byteorder;
 extern crate rblas as blas;