set thread names, when available

configure.ac

@@ -200,6 +200,7 @@ AC_CHECK_FUNCS([timegm])
 AC_CHECK_FUNCS([nanosleep])
 AC_CHECK_FUNCS([setppriv])
 AC_CHECK_FUNCS([getline])
+AC_CHECK_FUNCS([pthread_setname_np])
 
 save_LIBS="${LIBS}"
 LIBS="${PTHREAD_LIBS}"

src/monitor.c

@@ -29,6 +29,8 @@
  *
  */
 
+#include "config.h"
+
 #include <syslog.h>
 #include <pthread.h>
 #include <errno.h>
@@ -73,6 +75,7 @@ monitor_cleanup(void *arg)
 static void *
 monitor_main(void *arg)
 {
+    thread_setname(pthread_self(), "vevent_monitor");
     LOG_Log(LOG_NOTICE, "Monitor thread running every %u secs",
         config.monitor_interval);
     run = 1;

src/varnishevent.h

@@ -68,6 +68,14 @@
 #define DEFAULT_CFORMAT \
     "%h %l %u %t \"%r\" %s %b \"%{Referer}i\" \"%{User-agent}i\""
 
+#ifdef HAVE_PTHREAD_SETNAME_NP
+#define thread_setname(thr,name) pthread_setname_np((thr),(name))
+#elif defined(HAVE_PTHREAD_SET_NAME_NP)
+#define thread_setname(thr,name) pthread_set_name_np((thr),(name))
+#else
+#define thread_setname(thr,name) do { (void)(thr); (void)(name); } while(0)
+#endif
+
 struct sigaction default_action;
 
 int tag2idx[MAX_VSL_TAG];

src/writer.c

@@ -30,6 +30,8 @@
  *
  */
 
+#include "config.h"
+
 #include <pthread.h>
 #include <stdlib.h>
 #include <syslog.h>
@@ -273,6 +275,7 @@ static void
 
     LOG_Log0(LOG_NOTICE, "Writer thread starting");
     CHECK_OBJ_NOTNULL(wrt, WRITER_DATA_MAGIC);
+    thread_setname(pthread_self(), "vevent_writer");
     wrt->state = WRT_INITIALIZING;
 
     VSTAILQ_INIT(&wrt_freetx);