From 16d2f4faff4d06c26a162c50fb47fc2f1f0f73e0 Mon Sep 17 00:00:00 2001
From: Mahmoud Al-Qudsi <mqudsi@neosmart.net>
Date: Sat, 29 Jul 2017 13:13:07 -0500
Subject: [PATCH] Added important comment about blocked_pid

---
 src/exec.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/exec.cpp b/src/exec.cpp
index 97669ba6f..1251e5ed0 100644
--- a/src/exec.cpp
+++ b/src/exec.cpp
@@ -496,6 +496,8 @@ void exec_job(parser_t &parser, job_t *j) {
     // We are careful to set these to -1 when closed, so if we exit the loop abruptly, we can still
     // close them.
     bool pgrp_set = false;
+    //this is static since processes can block on input/output across jobs
+    //the main exec_job loop is only ever run in a single thread, so this is OK
     static pid_t blocked_pid = -1;
     int pipe_current_read = -1, pipe_current_write = -1, pipe_next_read = -1;
     for (std::unique_ptr<process_t> &unique_p : j->processes) {