From 99d75648f033b16f8739dcf2cc9f8e80c38fb612 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Thu, 23 Mar 2017 14:59:38 -0700
Subject: [PATCH] ircd::log: Add assertion for log calls from non-main threads.

---
 ircd/logger.cc | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/ircd/logger.cc b/ircd/logger.cc
index dc84aafc9..859c288eb 100644
--- a/ircd/logger.cc
+++ b/ircd/logger.cc
@@ -73,6 +73,13 @@ static void open(const facility &fac);
 static void prefix(const facility &fac, const char *const &date);
 static void suffix(const facility &fac);
 
+const auto main_thread_id
+{
+	std::this_thread::get_id()
+};
+
+void thread_assertion();
+
 } // namespace log
 } // namespace ircd
 
@@ -265,6 +272,8 @@ void
 log::slog(const facility &fac,
           const std::function<void (std::ostream &)> &closure)
 {
+	void thread_assertion();
+
 	if(!file[fac].is_open() && !console_out[fac] && !console_err[fac])
 		return;
 
@@ -367,7 +376,6 @@ log::reflect(const facility &f)
 	return "??????";
 }
 
-
 const char *
 ircd::smalldate(const time_t &ltime)
 {
@@ -387,3 +395,10 @@ ircd::smalldate(const time_t &ltime)
 
 	return buf;
 }
+
+void
+ircd::log::thread_assertion()
+{
+	// Trying to log from another thread is not yet allowed
+	assert(std::this_thread::get_id() == main_thread_id);
+}