Bug 1486281 - Implement js::ThisThread::GetName() on FreeBSD 11.3/12.0. r=sfink r=Build

js/src/old-configure.in

@@ -1109,7 +1109,7 @@ dnl Checks for library functions.
 dnl ========================================================
 AC_PROG_GCC_TRADITIONAL
 AC_FUNC_MEMCMP
-AC_CHECK_FUNCS([getc_unlocked _getc_nolock gmtime_r localtime_r pthread_getname_np])
+AC_CHECK_FUNCS([getc_unlocked _getc_nolock gmtime_r localtime_r pthread_getname_np pthread_get_name_np])
 
 dnl check for clock_gettime(), the CLOCK_MONOTONIC clock
 dnl avoid this on Darwin, since depending on your system config, we may think

js/src/threading/posix/Thread.cpp

@@ -208,6 +208,9 @@ js::ThisThread::GetName(char* nameBuffer, size_t len)
   int rv = -1;
 #ifdef HAVE_PTHREAD_GETNAME_NP
   rv = pthread_getname_np(pthread_self(), nameBuffer, len);
+#elif defined(HAVE_PTHREAD_GET_NAME_NP)
+  pthread_get_name_np(pthread_self(), nameBuffer, len);
+  rv = 0;
 #elif defined(__linux__)
   rv = prctl(PR_GET_NAME, reinterpret_cast<unsigned long>(nameBuffer));
 #endif