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. --- include/link.h | 3 +++ include/stdlib.h | 5 +++++ 2 files changed, 8 insertions(+) (limited to 'include') diff --git a/include/link.h b/include/link.h index 230e95d6c8..7dc3cd1e32 100644 --- a/include/link.h +++ b/include/link.h @@ -302,6 +302,9 @@ struct link_map /* Index of the module in the dtv array. */ size_t l_tls_modid; + /* Number of thread_local objects constructed by this DSO. */ + size_t l_tls_dtor_count; + /* Information used to change permission after the relocations are done. */ ElfW(Addr) l_relro_addr; diff --git a/include/stdlib.h b/include/stdlib.h index 2e536641b9..db1812d85a 100644 --- a/include/stdlib.h +++ b/include/stdlib.h @@ -100,6 +100,11 @@ extern int __cxa_atexit (void (*func) (void *), void *arg, void *d); extern int __cxa_atexit_internal (void (*func) (void *), void *arg, void *d) attribute_hidden; +extern int __cxa_thread_atexit_impl (void (*func) (void *), void *arg, + void *d); +extern void __call_tls_dtors (void); +libc_hidden_proto (__call_tls_dtors); + extern void __cxa_finalize (void *d); extern int __posix_memalign (void **memptr, size_t alignment, size_t size); -- cgit v1.2.3