Set standard name to non-libnetdata threads (libuv, pthread) (#7584)

* [libnetdata/threads] Add uv_thread_set_name

This is inspired from thread_set_name() but for libuv threads.
Both are based on pthread, but for uv we need to call it with the
uv_thread_t pointer, instead of being the thread that calls the
function for itself.

* [exporting] Set libuv threadname to "EXPORTING-index"

* [database/engine] Set libuv thread name to "DBENGINE"

* [daemon/command] Set libuv thread name to "DAEMON-COMMAND"

* [collectors/proc] Set pthread name to "PLUGIN[cpuidle]"

* Use new 'thread_set_name_np' name

2 files changed, 25 insertions, 5 deletions

diff --git a/libnetdata/threads/threads.c b/libnetdata/threads/threads.c
index 3b3f30415b..c310d528bc 100644
--- a/libnetdata/threads/threads.c
+++ b/libnetdata/threads/threads.c
@@ -109,14 +109,13 @@ static void thread_cleanup(void *ptr) {
     netdata_thread = NULL;
 }
 
-static void thread_set_name(NETDATA_THREAD *nt) {
+static void thread_set_name_np(NETDATA_THREAD *nt) {
 
     if (nt->tag) {
         int ret = 0;
 
-        // Name is limited to 16 chars
-        char threadname[16];
-        strncpyz(threadname, nt->tag, 15);
+        char threadname[NETDATA_THREAD_NAME_MAX+1];
+        strncpyz(threadname, nt->tag, NETDATA_THREAD_NAME_MAX);
 
 #if defined(__FreeBSD__)
         pthread_set_name_np(pthread_self(), threadname);
@@ -134,6 +133,24 @@ static void thread_set_name(NETDATA_THREAD *nt) {
     }
 }
 
+void uv_thread_set_name_np(uv_thread_t ut, const char* name) {
+    int ret = 0;
+
+    char threadname[NETDATA_THREAD_NAME_MAX+1];
+    strncpyz(threadname, name, NETDATA_THREAD_NAME_MAX);
+
+#if defined(__FreeBSD__)
+    pthread_set_name_np(ut, threadname);
+#elif defined(__APPLE__)
+    // Apple can only set its own name
+#else
+    ret = pthread_setname_np(ut, threadname);
+#endif
+
+    if (ret)
+        error("cannot set libuv thread name to %s. Err: %d", threadname, ret);
+}
+
 static void *thread_start(void *ptr) {
     netdata_thread = (NETDATA_THREAD *)ptr;
 
@@ -146,7 +163,7 @@ static void *thread_start(void *ptr) {
     if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
         error("cannot set pthread cancel state to ENABLE.");
 
-    thread_set_name(ptr);
+    thread_set_name_np(ptr);
 
     void *ret = NULL;
     pthread_cleanup_push(thread_cleanup, ptr);
diff --git a/libnetdata/threads/threads.h b/libnetdata/threads/threads.h
index eec6ad0e31..b7cb0e15a0 100644
--- a/libnetdata/threads/threads.h
+++ b/libnetdata/threads/threads.h
@@ -31,6 +31,9 @@ extern int netdata_thread_cancel(netdata_thread_t thread);
 extern int netdata_thread_join(netdata_thread_t thread, void **retval);
 extern int netdata_thread_detach(pthread_t thread);
 
+#define NETDATA_THREAD_NAME_MAX 15
+extern void uv_thread_set_name_np(uv_thread_t ut, const char* name);
+
 #define netdata_thread_self pthread_self
 #define netdata_thread_testcancel pthread_testcancel