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authorSiddhesh Poyarekar <siddhesh@redhat.com>2013-02-18 19:08:21 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2013-02-18 19:08:21 +0530
commitba384f6ed9275f3966505f2375b56d169e3dc588 (patch)
treed832a5a24bab934c946089b8d2a9a16f1766470d /include
parentffaa74cf68a370e232279a9a9b0a02ade287cc99 (diff)
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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.
Diffstat (limited to 'include')
-rw-r--r--include/link.h3
-rw-r--r--include/stdlib.h5
2 files changed, 8 insertions, 0 deletions
diff --git a/include/link.h b/include/link.h
index 230e95d..7dc3cd1 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 2e53664..db1812d 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);