From b636465bc0190448f960791cd059c4dd1fa37717 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 1 Aug 2011 05:05:12 +0200
Subject: [PATCH 1/1] util: add is_main_thread() call

---
 src/util.c | 9 +++++++++
 src/util.h | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/src/util.c b/src/util.c
index 6382c01c5..4e2a4fab8 100644
--- a/src/util.c
+++ b/src/util.c
@@ -5536,6 +5536,15 @@ char *join(const char *x, ...) {
         return r;
 }
 
+bool is_main_thread(void) {
+        static __thread int cached = 0;
+
+        if (_unlikely_(cached == 0))
+                cached = getpid() == gettid() ? 1 : -1;
+
+        return cached > 0;
+}
+
 static const char *const ioprio_class_table[] = {
         [IOPRIO_CLASS_NONE] = "none",
         [IOPRIO_CLASS_RT] = "realtime",
diff --git a/src/util.h b/src/util.h
index eb0061cdb..407160d52 100644
--- a/src/util.h
+++ b/src/util.h
@@ -460,6 +460,8 @@ int get_files_in_directory(const char *path, char ***list);
 
 char *join(const char *x, ...) _sentinel_;
 
+bool is_main_thread(void);
+
 #define NULSTR_FOREACH(i, l)                                    \
         for ((i) = (l); (i) && *(i); (i) = strchr((i), 0)+1)
 
-- 
2.30.2