From ba384f6ed9275f3966505f2375b56d169e3dc588 Mon Sep 17 00:00:00 2001 From: Siddhesh Poyarekar Date: Mon, 18 Feb 2013 19:08:21 +0530 Subject: C++11 thread_local destructors support This feature is specifically for the C++ compiler to offload calling thread_local object destructors on thread program exit, to glibc. This is to overcome the possible complication of destructors of thread_local objects getting called after the DSO in which they're defined is unloaded by the dynamic linker. The DSO is marked as 'unloadable' if it has a constructed thread_local object and marked as 'unloadable' again when all the constructed thread_local objects defined in it are destroyed. --- stdlib/tst-tls-atexit-lib.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 stdlib/tst-tls-atexit-lib.c (limited to 'stdlib/tst-tls-atexit-lib.c') diff --git a/stdlib/tst-tls-atexit-lib.c b/stdlib/tst-tls-atexit-lib.c new file mode 100644 index 0000000000..aab28bb607 --- /dev/null +++ b/stdlib/tst-tls-atexit-lib.c @@ -0,0 +1,36 @@ +/* Verify that DSO is unloaded only if its TLS objects are destroyed - the DSO. + Copyright (C) 2012 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +extern void *__dso_handle; + +typedef struct +{ + void *val; +} A; + +/* We only care about the destructor. */ +void A_dtor (void *obj) +{ + ((A *)obj)->val = obj; +} + +void do_foo (void) +{ + static __thread A b; + __cxa_thread_atexit_impl (A_dtor, &b, __dso_handle); +} -- cgit 1.4.1