Add deno.pid (#1464)

js/deno.ts

@@ -2,7 +2,7 @@
 
 // Public deno module.
 /// <amd-module name="deno"/>
-export { env, exit } from "./os";
+export { pid, env, exit } from "./os";
 export { chdir, cwd } from "./dir";
 export {
   File,

js/main.ts

@@ -54,6 +54,8 @@ export default function denoMain() {
     os.exit(0);
   }
 
+  os.setPid(startResMsg.pid());
+
   const cwd = startResMsg.cwd();
   log("cwd", cwd);
 

js/os.ts

@@ -5,6 +5,14 @@ import * as util from "./util";
 import * as flatbuffers from "./flatbuffers";
 import { sendSync } from "./dispatch";
 
+/** process id */
+export let pid: number;
+
+export function setPid(pid_: number): void {
+  assert(!pid);
+  pid = pid_;
+}
+
 interface CodeInfo {
   moduleName: string | undefined;
   filename: string | undefined;

js/os_test.ts

@@ -22,3 +22,8 @@ test(async function envFailure() {
 
   assert(caughtError);
 });
+
+test(function osPid() {
+  console.log("pid", deno.pid);
+  assert(deno.pid > 0);
+});

src/msg.fbs

@@ -138,6 +138,7 @@ table Start {
 
 table StartRes {
   cwd: string;
+  pid: uint32;
   argv: [string];
   debug_flag: bool;
   deps_flag: bool;

src/ops.rs

@@ -201,6 +201,7 @@ fn op_start(
     &mut builder,
     &msg::StartResArgs {
       cwd: Some(cwd_off),
+      pid: std::process::id(),
       argv: Some(argv_off),
       debug_flag: state.flags.log_debug,
       recompile_flag: state.flags.recompile,