feat(runtime): add op_set_exit_code (#12911)

Set the exit code to use if none is provided to Deno.exit(), or when
Deno exits naturally.

Needed for process.exitCode Node compat. Paves the way for #12888.

1 files changed, 11 insertions, 0 deletions

diff --git a/runtime/lib.rs b/runtime/lib.rs
index fb6159dd9..ca250ce20 100644
--- a/runtime/lib.rs
+++ b/runtime/lib.rs
@@ -1,5 +1,7 @@
 // Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
 
+use std::sync::atomic::AtomicI32;
+
 pub use deno_broadcast_channel;
 pub use deno_console;
 pub use deno_crypto;
@@ -29,3 +31,12 @@ pub mod worker;
 
 mod worker_bootstrap;
 pub use worker_bootstrap::BootstrapOptions;
+
+// The global may not be very elegant but:
+//
+// 1. op_exit() calls std::process::exit() so there is not much point storing
+//    the exit code in runtime state
+//
+// 2. storing it in runtime state makes retrieving it again in cli/main.rs
+//    unduly complicated
+pub static EXIT_CODE: AtomicI32 = AtomicI32::new(0);