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| author | Carl Dong <contact@carldong.me> | 2021-01-27 16:20:59 -0500 |
|---|---|---|
| committer | Carl Dong <contact@carldong.me> | 2021-01-28 14:14:22 -0500 |
| commit | f92dc6557a153b390a1ae1d0808ff7ed5d02c66e (patch) | |
| tree | d8f634761b2bd2a792847625776aa24fc12fd136 /src/validation.h | |
| parent | e130ff38c91ad3527924e6195325f6ae7ce5d77c (diff) | |
validation: Guard the active_chainstate with cs_main
This avoids a potential race-condition where a thread is reading the
ChainstateManager::m_active_chainstate pointer while another one is
writing to it. There is no portable guarantee that reading/writing the
pointer is thread-safe.
This is also done in way that mimics ::ChainstateActive(), so the
transition from that function to this method is easy.
More discussion:
1. https://github.com/bitcoin/bitcoin/pull/20749#discussion_r559544027
2. https://github.com/bitcoin/bitcoin/pull/19806#discussion_r561023961
3. https://github.com/bitcoin/bitcoin/pull/19806#issuecomment-768946522
4. https://github.com/bitcoin/bitcoin/pull/19806#issuecomment-768955695
Diffstat (limited to 'src/validation.h')
| -rw-r--r-- | src/validation.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/validation.h b/src/validation.h index d3fbabe1a2..5d060ec753 100644 --- a/src/validation.h +++ b/src/validation.h @@ -817,7 +817,7 @@ private: //! This is especially important when, e.g., calling ActivateBestChain() //! on all chainstates because we are not able to hold ::cs_main going into //! that call. - CChainState* m_active_chainstate{nullptr}; + CChainState* m_active_chainstate GUARDED_BY(::cs_main) {nullptr}; //! If true, the assumed-valid chainstate has been fully validated //! by the background validation chainstate. |