Fix csBestBlock/cvBlockChange waiting in rpc/mining #12743

pull sipa wants to merge 2 commits into bitcoin:master from sipa:201803_waitblockchange changing 4 files +15 −9

sipa commented at 4:06 AM on March 21, 2018: member

This is an alternative to #11694.

It reintroduces a uint256 variable with the best block hash, protected by csBestBlock, and only updated while holding it.

Also rename the involved variable to modern guidelines, as there are very few uses.
fanquake added the label RPC/REST/ZMQ on Mar 21, 2018
practicalswift commented at 7:08 AM on March 21, 2018: contributor

Concept ACK! Much better than PR #11694 which I'm now closing :-)
promag commented at 3:24 PM on March 21, 2018: member

utACK 42be289.

in src/validation.h:168 in 42be289df0 outdated

 162 | @@ -163,8 +163,9 @@ extern BlockMap& mapBlockIndex;
 163 |  extern uint64_t nLastBlockTx;
 164 |  extern uint64_t nLastBlockWeight;
 165 |  extern const std::string strMessageMagic;
 166 | -extern CWaitableCriticalSection csBestBlock;
 167 | -extern CConditionVariable cvBlockChange;
 168 | +extern CWaitableCriticalSection cs_best_block;
 169 | +extern CConditionVariable cv_best_block_change;
 170 | +extern uint256 best_block_hash;

ryanofsky commented at 7:24 PM on April 3, 2018:

Maybe prefix global variable name with g_. (I would probably call these g_best_block g_best_block_mutex g_best_block_cv.)

sipa commented at 1:02 AM on April 4, 2018:

Fixed.

ryanofsky commented at 7:26 PM on April 3, 2018: member

utACK 42be289df0c277777f7bbfc383ca7520140775cf. Nice simple bugfix.
sipa force-pushed on Apr 4, 2018
promag commented at 1:15 AM on April 4, 2018: member

utACK d1cbc67a.
luke-jr commented at 1:32 AM on April 4, 2018: member

utACK, although would prefer the renaming was in a separate commit.
Fix csBestBlock/cvBlockChange waiting in rpc/mining 45dd135039
Modernize best block mutex/cv/hash variable naming 4a6c0e3dcf
sipa force-pushed on Apr 4, 2018
sipa commented at 4:54 AM on April 4, 2018: member

@luke-jr Done.
ryanofsky commented at 6:41 PM on April 4, 2018: member

utACK 4a6c0e3dcfdca98270cb96b73db4c3d4446dba50. Only change since last review renaming variables and splitting commit.
jnewbery commented at 8:42 PM on April 4, 2018: member

utACK 4a6c0e3dcfdca98270cb96b73db4c3d4446dba50

Travis timeout. Kicking.
sipa merged this on Apr 13, 2018
sipa closed this on Apr 13, 2018
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#11694 rpc: Add missing cs_main lock in getblocktemplate(...)