add membarrier syscall wrapper, refactor dynamic tls install to use it

the motivation for this change is twofold. first, it gets the fallback
logic out of the dynamic linker, improving code readability and
organization. second, it provides application code that wants to use
the membarrier syscall, which depends on preregistration of intent
before the process becomes multithreaded unless unbounded latency is
acceptable, with a symbol that, when linked, ensures that this
registration happens.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/internal/pthread_impl.h b/src/internal/pthread_impl.h
index de089967..9b001421 100644
--- a/src/internal/pthread_impl.h
+++ b/src/internal/pthread_impl.h
@@ -130,7 +130,7 @@ hidden int __init_tp(void *);
 hidden void *__copy_tls(unsigned char *);
 hidden void __reset_tls();
 
-hidden void __dl_prepare_for_threads(void);
+hidden void __membarrier_init(void);
 hidden void __dl_thread_cleanup(void);
 hidden void __testcancel();
 hidden void __do_cleanup_push(struct __ptcb *);