path: root/src/ldso
diff options
authorRich Felker <>2013-08-03 16:27:30 -0400
committerRich Felker <>2013-08-03 16:27:30 -0400
commit7c6c290695cb8726e876ff4fb8413913f661fc0b (patch)
tree9bba80c02f293fcf759bd9b2fe0004f99ac96fae /src/ldso
parent7356c2554e33cf16768616e8e3ae4a4f5a5aac17 (diff)
add system for resetting TLS to initial values
this is needed for reused threads in the SIGEV_THREAD timer notification system, and could be reused elsewhere in the future if needed, though it should be refactored for such use. for static linking, __init_tls.c is simply modified to export the TLS info in a structure with external linkage, rather than using statics. this perhaps makes the code more clear, since the statics were poorly named for statics. the new __reset_tls.c is only linked if it is used. for dynamic linking, the code is in dynlink.c. sharing code with __copy_tls is not practical since __reset_tls must also re-zero thread-local bss.
Diffstat (limited to 'src/ldso')
1 files changed, 13 insertions, 0 deletions
diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index d689f96e..fa5ad004 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -783,6 +783,19 @@ void _dl_debug_state(void)
+void __reset_tls()
+ pthread_t self = __pthread_self();
+ struct dso *p;
+ for (p=head; p; p=p->next) {
+ if (!p->tls_id || !self->dtv[p->tls_id]) continue;
+ memcpy(self->dtv[p->tls_id], p->tls_image, p->tls_len);
+ memset((char *)self->dtv[p->tls_id]+p->tls_len, 0,
+ p->tls_size - p->tls_len);
+ if (p->tls_id == (size_t)self->dtv[0]) break;
+ }
void *__copy_tls(unsigned char *mem)
pthread_t td;