Create prof_sys module for reading system thread name

src/prof_sys.c

@@ -0,0 +1,27 @@
+#define JEMALLOC_PROF_SYS_C_
+#include "jemalloc/internal/jemalloc_preamble.h"
+#include "jemalloc/internal/jemalloc_internal_includes.h"
+
+#include "jemalloc/internal/prof_data.h"
+#include "jemalloc/internal/prof_sys.h"
+
+static int
+prof_sys_thread_name_read_impl(char *buf, size_t limit) {
+#ifdef JEMALLOC_HAVE_PTHREAD_SETNAME_NP
+	return pthread_getname_np(pthread_self(), buf, limit);
+#else
+	return ENOSYS;
+#endif
+}
+prof_sys_thread_name_read_t *JET_MUTABLE prof_sys_thread_name_read =
+    prof_sys_thread_name_read_impl;
+
+void
+prof_sys_thread_name_fetch(tsd_t *tsd) {
+#define THREAD_NAME_MAX_LEN 16
+	char buf[THREAD_NAME_MAX_LEN];
+	if (!prof_sys_thread_name_read(buf, THREAD_NAME_MAX_LEN)) {
+		prof_thread_name_set_impl(tsd, buf);
+	}
+#undef THREAD_NAME_MAX_LEN
+}