fixes #960 NNG threads inherit application thread name

This also exposes an nng_thread_set_name() function for
applications to use.  All NNG thread names start with "nng:".
Note that support is highly dependent on the operating system.

1 files changed, 26 insertions, 1 deletions

diff --git a/src/platform/posix/posix_thread.c b/src/platform/posix/posix_thread.c
index b8fa814e..0178455f 100644
--- a/src/platform/posix/posix_thread.c
+++ b/src/platform/posix/posix_thread.c
@@ -1,5 +1,5 @@
 //
-// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2020 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2018 Capitar IT Group BV <info@capitar.com>
 //
 // This software is supplied under the terms of the MIT License, a
@@ -254,6 +254,31 @@ nni_plat_thr_is_self(nni_plat_thr *thr)
 }
 
 void
+nni_plat_thr_set_name(nni_plat_thr *thr, const char *name)
+{
+#if defined(NNG_HAVE_PTHREAD_SET_NAME_NP)
+	if (thr == NULL) {
+		pthread_set_name_np(pthread_self(), name);
+	} else {
+        	pthread_set_name_np(thr->tid, name);
+	}
+#elif defined(NNG_HAVE_PTHREAD_SETNAME_NP)
+#if defined(__APPLE__)
+	// Darwin is weird, it can only set the name of pthread_self.
+	if ((thr == NULL) || (pthread_self() == thr->tid)) {
+        	pthread_setname_np(name);
+	}
+#else
+	if (thr == NULL) {
+                pthread_setname_np(pthread_self(), name);
+	} else {
+                pthread_setname_np(thr->tid, name);
+	}
+#endif
+#endif
+}
+
+void
 nni_atfork_child(void)
 {
 	nni_plat_forked = 1;