From 5fa367c2cf5c83ed4beee05dd4ce54489a487ab7 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Thu, 23 Jul 2020 09:07:26 +0200
Subject: Fix for issue #50: usage in plugins on Linux.

---
 src/Fl_lock.cxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/Fl_lock.cxx b/src/Fl_lock.cxx
index 732ceb905..a98be46ec 100644
--- a/src/Fl_lock.cxx
+++ b/src/Fl_lock.cxx
@@ -317,7 +317,9 @@ static void unlock_function_rec() {
 #  endif // PTHREAD_MUTEX_RECURSIVE
 
 void Fl_Posix_System_Driver::awake(void* msg) {
-  if (write(thread_filedes[1], &msg, sizeof(void*))==0) { /* ignore */ }
+  if (thread_filedes[1]) {
+    if (write(thread_filedes[1], &msg, sizeof(void*))==0) { /* ignore */ }
+  }
 }
 
 static void* thread_message_;
-- 
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