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| author |   Paul Pluzhnikov <ppluzhnikov@google.com> | 2013-12-18 16:24:19 -0800 |
|---|---|---|
| committer | Paul Pluzhnikov <ppluzhnikov@google.com> | 2013-12-18 16:24:19 -0800 |
| commit | 35e8f7ab94c910659de9d507aa0f3e1f8973d914 (patch) | |
| tree | fca3c69ec2085dbeee15673472350c9067ddf4f7 /elf/dl-tls.c | |
| parent | Patch [1/4] async-signal safe TLS. (diff) | |
| download | glibc-35e8f7ab94c910659de9d507aa0f3e1f8973d914.tar.gz glibc-35e8f7ab94c910659de9d507aa0f3e1f8973d914.tar.bz2 glibc-35e8f7ab94c910659de9d507aa0f3e1f8973d914.zip | |
Patch 3/4 of the effort to make TLS access async-signal-safe.
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.
Diffstat (limited to 'elf/dl-tls.c')
| -rw-r--r-- | elf/dl-tls.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/elf/dl-tls.c b/elf/dl-tls.c index 576d9a1465..c60a6b7b80 100644 --- a/elf/dl-tls.c +++ b/elf/dl-tls.c @@ -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[]; |