1 files changed, 111 insertions, 0 deletions
diff --git a/src/libstd/sys/cloudabi/time.rs b/src/libstd/sys/cloudabi/time.rs
new file mode 100644
index 00000000000..ee12731619a
--- /dev/null
+++ b/src/libstd/sys/cloudabi/time.rs
@@ -0,0 +1,111 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use mem;
+use sys::cloudabi::abi;
+use time::Duration;
+
+const NSEC_PER_SEC: abi::timestamp = 1_000_000_000;
+
+#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
+pub struct Instant {
+    t: abi::timestamp,
+}
+
+pub fn dur2intervals(dur: &Duration) -> abi::timestamp {
+    dur.as_secs()
+        .checked_mul(NSEC_PER_SEC)
+        .and_then(|nanos| nanos.checked_add(dur.subsec_nanos() as abi::timestamp))
+        .expect("overflow converting duration to nanoseconds")
+}
+
+impl Instant {
+    pub fn now() -> Instant {
+        unsafe {
+            let mut t = mem::uninitialized();
+            let ret = abi::clock_time_get(abi::clockid::MONOTONIC, 0, &mut t);
+            assert_eq!(ret, abi::errno::SUCCESS);
+            Instant { t: t }
+        }
+    }
+
+    pub fn sub_instant(&self, other: &Instant) -> Duration {
+        let diff = self.t
+            .checked_sub(other.t)
+            .expect("second instant is later than self");
+        Duration::new(diff / NSEC_PER_SEC, (diff % NSEC_PER_SEC) as u32)
+    }
+
+    pub fn add_duration(&self, other: &Duration) -> Instant {
+        Instant {
+            t: self.t
+                .checked_add(dur2intervals(other))
+                .expect("overflow when adding duration to instant"),
+        }
+    }
+
+    pub fn sub_duration(&self, other: &Duration) -> Instant {
+        Instant {
+            t: self.t
+                .checked_sub(dur2intervals(other))
+                .expect("overflow when subtracting duration from instant"),
+        }
+    }
+}
+
+#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
+pub struct SystemTime {
+    t: abi::timestamp,
+}
+
+impl SystemTime {
+    pub fn now() -> SystemTime {
+        unsafe {
+            let mut t = mem::uninitialized();
+            let ret = abi::clock_time_get(abi::clockid::REALTIME, 0, &mut t);
+            assert_eq!(ret, abi::errno::SUCCESS);
+            SystemTime { t: t }
+        }
+    }
+
+    pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
+        if self.t >= other.t {
+            let diff = self.t - other.t;
+            Ok(Duration::new(
+                diff / NSEC_PER_SEC,
+                (diff % NSEC_PER_SEC) as u32,
+            ))
+        } else {
+            let diff = other.t - self.t;
+            Err(Duration::new(
+                diff / NSEC_PER_SEC,
+                (diff % NSEC_PER_SEC) as u32,
+            ))
+        }
+    }
+
+    pub fn add_duration(&self, other: &Duration) -> SystemTime {
+        SystemTime {
+            t: self.t
+                .checked_add(dur2intervals(other))
+                .expect("overflow when adding duration to instant"),
+        }
+    }
+
+    pub fn sub_duration(&self, other: &Duration) -> SystemTime {
+        SystemTime {
+            t: self.t
+                .checked_sub(dur2intervals(other))
+                .expect("overflow when subtracting duration from instant"),
+        }
+    }
+}
+
+pub const UNIX_EPOCH: SystemTime = SystemTime { t: 0 };