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Async-signal safe TLS.

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ChangeLog:

2014-01-03  Andrew Hunter  <ahh@google.com>

	* elf/dl-open.c (): New comment.
	* elf/dl-reloc.c (_dl_try_allocate_static_tls): Use
	atomic_compare_and_exchange_bool_acq
	(_dl_allocate_static_tls): Block signals.
	* elf/dl-tls.c (allocate_and_init): Return void.
	(_dl_update_slotinfo): Block signals, use atomic update.

nptl/ChangeLog:

2014-01-03  Andrew Hunter  <ahh@google.com>

	* nptl/Makefile (tst-tls7): New test.
	* nptl/tst-tls7.c: New file.
	* nptl/tst-tls7mod.c: New file.
	* nptl/allocatestack.c (init_one_static_tls): Use atomic barrier.
This commit is contained in:
Andrew Hunter
2014-01-03 11:22:26 -08:00
committed by Paul Pluzhnikov
parent 7dd009d865
commit 7f507ee17a
9 changed files with 313 additions and 46 deletions
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5
elf/dl-open.c
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@ -548,7 +548,10 @@ cannot load any more object with static TLS"));
generation of the DSO we are allocating data for. */
_dl_update_slotinfo (imap->l_tls_modid);
#endif
/* We do this iteration under a signal mask in dl-reloc; why not
here? Because these symbols are new and dlopen hasn't
returned yet. So we can't possibly be racing with a TLS
access to them from another thread. */
GL(dl_init_static_tls) (imap);
assert (imap->l_need_tls_init == 0);
}