From e87b0a7523385a38dc65216214863935aa741f02 Mon Sep 17 00:00:00 2001
From: Paul Dicker <pitdicker@gmail.com>
Date: Sat, 25 Nov 2017 16:23:33 +0100
Subject: [PATCH] Fix JitterRng on Windows

---
 src/jitter_rng.rs | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/jitter_rng.rs b/src/jitter_rng.rs
index d36cf79aafe..21609dfa456 100644
--- a/src/jitter_rng.rs
+++ b/src/jitter_rng.rs
@@ -670,7 +670,8 @@ impl JitterRng {
     }
 }
 
-#[cfg(all(feature="std", not(any(target_os = "macos", target_os = "ios"))))]
+#[cfg(all(feature="std", not(any(target_os = "macos", target_os = "ios",
+                                 target_os = "windows"))))]
 fn get_nstime() -> u64 {
     use std::time::{SystemTime, UNIX_EPOCH};
 
@@ -694,6 +695,21 @@ fn get_nstime() -> u64 {
     unsafe { libc::mach_absolute_time() }
 }
 
+#[cfg(all(feature="std", any(target_os = "windows")))]
+fn get_nstime() -> u64 {
+    #[allow(non_camel_case_types)]
+    type LARGE_INTEGER = i64;
+    #[allow(non_camel_case_types)]
+    type BOOL = i32;
+    extern "system" {
+        fn QueryPerformanceCounter(lpPerformanceCount: *mut LARGE_INTEGER) -> BOOL;
+    }
+
+    let mut t = 0;
+    unsafe { QueryPerformanceCounter(&mut t); }
+    t as u64
+}
+
 // A function that is opaque to the optimizer to assist in avoiding dead-code
 // elimination. Taken from `bencher`.
 fn black_box<T>(dummy: T) -> T {