Add the prof_sys_thread_name feature in the prof_recent unit test.

This tests the combination of the prof_recent and thread_name features.
Verified that it catches the issue being fixed in this PR.

Also explicitly set thread name in test/unit/prof_recent.  This fixes the name
testing when no default thread name is set (e.g. FreeBSD).

test/include/test/thd.h

@@ -5,5 +5,7 @@ typedef HANDLE thd_t;
 typedef pthread_t thd_t;
 #endif
 
-void	thd_create(thd_t *thd, void *(*proc)(void *), void *arg);
-void	thd_join(thd_t thd, void **ret);
+void thd_create(thd_t *thd, void *(*proc)(void *), void *arg);
+void thd_join(thd_t thd, void **ret);
+bool thd_has_setname(void);
+void thd_setname(const char *name);

test/src/thd.c

@@ -32,3 +32,21 @@ thd_join(thd_t thd, void **ret) {
 	pthread_join(thd, ret);
 }
 #endif
+
+void
+thd_setname(const char *name) {
+#ifdef JEMALLOC_HAVE_PTHREAD_SETNAME_NP
+	pthread_setname_np(pthread_self(), name);
+#elif defined(JEMALLOC_HAVE_PTHREAD_SET_NAME_NP)
+	pthread_set_name_np(pthread_self(), name);
+#endif
+}
+
+bool
+thd_has_setname(void) {
+#if defined(JEMALLOC_HAVE_PTHREAD_SETNAME_NP) || defined(JEMALLOC_HAVE_PTHREAD_SET_NAME_NP)
+	return true;
+#else
+	return false;
+#endif
+}

test/unit/prof_recent.c

@@ -5,6 +5,8 @@
 /* As specified in the shell script */
 #define OPT_ALLOC_MAX 3
 
+const char *test_thread_name = "test_thread";
+
 /* Invariant before and after every test (when config_prof is on) */
 static void
 confirm_prof_setup() {
@@ -439,16 +441,11 @@ confirm_record(const char *template, const confirm_record_t *records,
 			}
 			ASSERT_CHAR(',');
 
-			if (opt_prof_sys_thread_name) {
+			if (thd_has_setname() && opt_prof_sys_thread_name) {
 				ASSERT_FORMATTED_STR("\"%s_thread_name\"",
 				    *type);
-				ASSERT_CHAR(':');
-				ASSERT_CHAR('"');
-				while (*start != '"') {
-					++start;
-				}
-				ASSERT_CHAR('"');
-				ASSERT_CHAR(',');
+				ASSERT_FORMATTED_STR(":\"%s\",",
+				    test_thread_name);
 			}
 
 			ASSERT_FORMATTED_STR("\"%s_time\"", *type);
@@ -495,6 +492,7 @@ confirm_record(const char *template, const confirm_record_t *records,
 TEST_BEGIN(test_prof_recent_alloc_dump) {
 	test_skip_if(!config_prof);
 
+	thd_setname(test_thread_name);
 	confirm_prof_setup();
 
 	ssize_t future;

test/unit/prof_recent.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
 
 if [ "x${enable_prof}" = "x1" ] ; then
-  export MALLOC_CONF="prof:true,prof_active:true,lg_prof_sample:0,prof_recent_alloc_max:3"
+  export MALLOC_CONF="prof:true,prof_active:true,lg_prof_sample:0,prof_recent_alloc_max:3,prof_sys_thread_name:true"
 fi