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Patch 3/4 of the effort to make TLS access async-signal-safe.

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Factor out _dl_clear_dtv.

2013-12-18  Andrew Hunter  <ahh@google.com>

	* elf/Versions (ld): Add _dl_clear_dtv.
	* sysdeps/generic/ldsodefs.h (_dl_clear_dtv): New prototype.
	* elf/dl-tls.c (_dl_clear_dtv): New function.
	* nptl/allocatestack.c (get_cached_stack): Call _dl_clear_dtv.
This commit is contained in:
Paul Pluzhnikov
2013-12-18 16:24:19 -08:00
parent 69a17d9d24
commit 35e8f7ab94
5 changed files with 26 additions and 5 deletions
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12
elf/dl-tls.c
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@ -463,6 +463,18 @@ _dl_allocate_tls (void *mem)
}
rtld_hidden_def (_dl_allocate_tls)
void
internal_function
_dl_clear_dtv (dtv_t *dtv)
{
for (size_t cnt = 0; cnt < dtv[-1].counter; ++cnt)
if (! dtv[1 + cnt].pointer.is_static
&& dtv[1 + cnt].pointer.val != TLS_DTV_UNALLOCATED)
free (dtv[1 + cnt].pointer.val);
memset (dtv, '\0', (dtv[-1].counter + 1) * sizeof (dtv_t));
}
rtld_hidden_def (_dl_clear_dtv)
#ifndef SHARED
extern dtv_t _dl_static_dtv[];