ensure that thread dtv pointer is never null to optimize __tls_get_addr

[musl] / src / thread / pthread_self.c

diff --git a/src/thread/pthread_self.c b/src/thread/pthread_self.c
index c50a2fb..aed4b5f 100644 (file)
--- a/src/thread/pthread_self.c
+++ b/src/thread/pthread_self.c
@@ -17,6 +17,8 @@ static int init_main_thread()
        main_thread->self = main_thread;
        main_thread->tid = main_thread->pid =
                __syscall(SYS_set_tid_address, &main_thread->tid);
+       if (!main_thread->dtv)
+               main_thread->dtv = (void *)dummy;
        libc.main_thread = main_thread;
        return 0;
 }