added completion status

src/job.rs

@@ -10,6 +10,81 @@ use std::io::{
 };
 use std::{fmt,error};
 
+/// A job's completion status
+///
+/// If the job has not completed, it will be the default value `Pending`.
+/// Once the job completes, the result of the job can be inserted to set to `Complete`.
+/// Afterwards, you can extract the value and it will have the state `Taken`; which means "job has completed, but the value has been consumed".
+///
+/// # Notes
+/// This is not coupled to anything, it's the user's responsibility to update this status when a job completes.
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum Status<T>
+{
+    /// For running operations
+    Pending,
+    /// An operation that has completed with its value
+    Complete(T),
+
+    /// An operation who's completed value has been extracted and processed
+    Taken,
+}
+
+impl<T> Status<T>
+{
+    /// Assign a completed value to this instance.
+    ///
+    /// If there was one already set, it is ignored.
+    #[inline] pub fn complete(&mut self, value: T)
+    {
+	*self = Self::Complete(value);
+    }
+
+    /// Has the value not yet been assigned or taken?
+    pub fn is_pending(&self) -> bool
+    {
+	match self {
+	    Self::Pending => true,
+	    _ => false,
+	}
+    }
+    /// Take the completed value from this instance
+    pub fn take(&mut self) -> Option<T>
+    {
+	match std::mem::replace(self, Self::Taken) {
+	    Self::Complete(t) => Some(t),
+	    _ => None
+	}
+    }
+
+    /// Get a mutable reference to the completed value if there is one.
+    pub fn peek_mut(&mut self) -> Option<&mut T>
+    {
+	match self {
+	    Self::Complete(ref mut t) => Some(t),
+	    _ => None,
+	}
+    }
+    /// Get a reference to the completed value if there is one.
+    pub fn peek(&self) -> Option<&T>
+    {
+	match self {
+	    Self::Complete(ref t) => Some(t),
+	    _ => None,
+	}
+    }
+}
+
+impl<T> Default for Status<T>
+{
+    #[inline]
+    fn default() -> Self
+    {
+	Self::Pending
+    }
+}
+
+
 #[derive(Debug)]
 pub struct Prelude
 {
@@ -52,8 +127,6 @@ pub struct Job
     offset: usize,
 }
 
-//TODO: job's work :^)
-
 impl Job
 {
     pub fn state(&self) -> &state::State

src/main.rs

@@ -21,6 +21,19 @@ use std::convert::TryFrom;
     };
 }
 
+macro_rules! vec_default {
+    ($num:expr) => {
+	{
+	    let num = $num;
+	    
+	    let mut v= Vec::with_capacity(num);
+	    v.resize_with(num, Default::default);
+	    v
+	}
+    }
+}
+
+
 mod state;
 mod pool;
 mod map;
@@ -54,6 +67,7 @@ fn work(arg::Operation{output, inputs}: arg::Operation) -> Result<(), Box<dyn st
     let output = output.complete(size)?;
 
     //  - create state
+    let mut complete: Vec<job::Status<usize>> = vec_default!(jobs.len()); // when we receive completion from the stream (which yeilds `(usize, usize)`), the first item is the *index* in this vector to set, and the second is the value
     let state: state::State = {todo!()};
     
     //  - spawn the task thread pool

src/map.rs

@@ -41,7 +41,7 @@ impl MemoryMapMut
     /// Unmap this file and return the fd
     pub fn unmap(self) -> fs::File
     {
-	use std::{mem, ptr};
+	use std::mem;
 	let mut this = mem::ManuallyDrop::new(self);
 	unsafe {
 	    let map = (&mut this.map as *mut MmapMut).read();