From d4510856a007712900795c79853d2218780c2321 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Tue, 27 Oct 2015 00:02:45 +0100
Subject: util-lib: move is_main_thread() to process-util.[ch]

---
 src/basic/process-util.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src/basic/process-util.c')

diff --git a/src/basic/process-util.c b/src/basic/process-util.c
index e0061d15b3..c5d7dc3089 100644
--- a/src/basic/process-util.c
+++ b/src/basic/process-util.c
@@ -585,3 +585,12 @@ bool pid_is_alive(pid_t pid) {
 
         return true;
 }
+
+bool is_main_thread(void) {
+        static thread_local int cached = 0;
+
+        if (_unlikely_(cached == 0))
+                cached = getpid() == gettid() ? 1 : -1;
+
+        return cached > 0;
+}
-- 
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