dont spin at max speed when waiting for foreground process

Signed-off-by: Ava Hahn <ava@sunnypup.io>

Readme.org

@@ -1,4 +1,3 @@
-
 #+Title: Relish: Rusty Expressive LIsp SHell
 #+Author: Ava Hahn
 
@@ -155,9 +154,8 @@ Note: this section only tracks the state of incomplete TODO items. Having everyt
 ** DONE Beta tasks
 (See tag: v0.3.0)
 ** TODO v1.0 tasks
-- set library
-- Can pass args to relish scripts (via interpreter)
 - Can pass args to relish scripts (via command line)
+- Can pass args to relish scripts (via interpreter)
 - finish basic goals in the [[file:snippets/interactive-devel.rls][interactive development library]]
 - Release CI
 - Rename to Flesh
@@ -167,7 +165,6 @@ Note: this section only tracks the state of incomplete TODO items. Having everyt
 - finish stretch goals in the [[file:snippets/interactive-devel.rls][interactive development library]]
 - History length configurable (env var?)
 - Lex function
-- Read function (Input + Lex)
 - execute configurable function on cd
 - Post to relevant channels
 - Implement Compose for lambdas

src/stl/posix.rs

@@ -50,6 +50,8 @@ use {
         env::set_current_dir,
         os::unix::process::CommandExt,
         mem,
+        thread,
+        time::Duration,
     },
     nix::{
         unistd, unistd::Pid,
@@ -253,6 +255,9 @@ fn make_foreground(pid: u32, state: &mut ShellState) -> Result<(), String>{
                                 .unwrap_or(-1);
 
                             break;
+                        } else {
+                            // sleep 1 sec
+                            thread::sleep(Duration::from_millis(1000));
                         }
                     },
                     Err(e) => {