utils: move killme() to C++ code in order to avoid global objects

common/include/villas/utils.h

@@ -37,8 +37,6 @@ extern "C" {
 #include <villas/config.h>
 #include <villas/log.h>
 
-extern pthread_t main_thread;
-
 #ifdef __GNUC__
   #define LIKELY(x)	__builtin_expect((x),1)
   #define UNLIKELY(x)	__builtin_expect((x),0)

common/lib/utils.c

@@ -34,8 +34,6 @@
 #include <villas/config.h>
 #include <villas/utils.h>
 
-pthread_t main_thread;
-
 double box_muller(float m, float s)
 {
 	double x1, x2, y1;
@@ -113,15 +111,6 @@ void * memdup(const void *src, size_t bytes)
 	return dst;
 }
 
-void killme(int sig)
-{
-	/* Send only to main thread in case the ID was initilized by signals_init() */
-	if (main_thread)
-		pthread_kill(main_thread, sig);
-	else
-		kill(0, sig);
-}
-
 pid_t spawn(const char* name, char *const argv[])
 {
 	pid_t pid;

common/lib/utils.cpp

@@ -35,6 +35,8 @@
 namespace villas {
 namespace utils {
 
+static pthread_t main_thread;
+
 std::vector<std::string>
 tokenize(std::string s, std::string delimiter)
 {
@@ -156,5 +158,18 @@ char * decolor(char *str)
 	return str;
 }
 
+extern "C" {
+
+void killme(int sig)
+{
+	/* Send only to main thread in case the ID was initilized by signals_init() */
+	if (main_thread)
+		pthread_kill(main_thread, sig);
+	else
+		kill(0, sig);
+}
+
+}
+
 } // namespace utils
 } // namespace villas