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fix locking issue with new mempool limiting #6889

merged 1 commit into from Oct 27, 2015


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jonasschnelli commented Oct 26, 2015

Current master crashes on OSX with an exception: "boost: mutex lock failed in pthread_mutex_lock: Invalid argument".

mempool is a global object and gets initialized over cxx_global_var_init(). Calling LOCK() within constructor (of a object in global scope) is problematic (at least on OSX).

Current master crashes on OSX with an exception: "boost: mutex lock failed in pthread_mutex_lock: Invalid argument"
@jonasschnelli jonasschnelli force-pushed the jonasschnelli:2015/10/fix_mempool_lock branch to 0d699fc Oct 26, 2015
@laanwj laanwj added the Bug label Oct 26, 2015
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laanwj commented Oct 26, 2015


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jonasschnelli commented Oct 26, 2015

The issue that this PR solves was introduced in #6722

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petertodd commented Oct 26, 2015


@@ -375,6 +375,7 @@ class CTxMemPool
void removeForBlock(const std::vector<CTransaction>& vtx, unsigned int nBlockHeight,
std::list<CTransaction>& conflicts, bool fCurrentEstimate = true);
void clear();

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dcousens Oct 27, 2015


nit: lockAndClear/clearSync maybe?

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laanwj Oct 27, 2015


Usually projects have some convention for this (eg _XX and XX, or XX_nolock and XX) . Where one is used internally (when lock already held) and the other externally (locks and calls inner function).
Preferable to have the names as similar as possible with just the lock/nonlock difference. lockAndClear and clearSync are too far apart to be easily recognizable as a set. So IMO the current naming is better.

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dcousens Oct 27, 2015


👍 just not something I'd seen before.

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dcousens commented Oct 27, 2015


@laanwj laanwj merged commit 0d699fc into bitcoin:master Oct 27, 2015
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laanwj added a commit that referenced this pull request Oct 27, 2015
0d699fc fix locking issue with new mempool limiting (Jonas Schnelli)
furszy added a commit to PIVX-Project/PIVX that referenced this pull request Jun 14, 2020
2105947 Implement helper class for CTxMemPoolEntry constructor (Alex Morcos)
1cef905 Make -checkmempool=1 not fail through int32 overflow (Pieter Wuille)
0f72ff2 Support -checkmempool=N, which runs checks on average once every N transactions (Pieter Wuille)
89483d0 [Bug] Make operator() a const function in CompareTxMemPoolEntryByX (random-zebra)
a50ad77 Lower default policy limits (random-zebra)
03f7152 fix locking issue with new mempool limiting (random-zebra)
1598961 Fix stale comment in CTxMemPool::TrimToSize. (random-zebra)
98d0d68 Undo GetMinFee-requires-extra-call-to-hit-0 (random-zebra)
6ad6ee6 Add reasonable test case for mempool trimming (random-zebra)
8dcbb7e Only call TrimToSize once per reorg/blocks disconnect (random-zebra)
c20cd38 Implement on-the-fly mempool size limitation. (random-zebra)
aee2e17 Print mempool size in KB when adding txn (random-zebra)
f7c85fd Add CFeeRate += operator (random-zebra)
5bd2a00 Track (and define) ::minRelayTxFee in CTxMemPool (random-zebra)
0b50f6c Add Mempool Expire function to remove old transactions (random-zebra)
d26f5e0 Fix calling mempool directly, instead of pool, in ATMP (random-zebra)
fc5eddb Reverse the sort on the mempool's feerate index (random-zebra)
0ce1df0 [BUG] Fix CTxMemPool::check excluding zerocoins from children checks (random-zebra)
1f7bd52 Track transaction packages in CTxMemPoolEntry (random-zebra)
1fd406b TxMemPool: Change mapTx to a boost::multi_index_container (random-zebra)

Pull request description:

  built on top of
  - [x] #1645

  This PR pulls some updates from upstream in the mempool area, adding the required adjustments for legacy zerocoin txes and updating the functional test suite.

  Specifically, here we:
  - track mempool descendants (in-mempool transactions that depend on other mempool transactions)
  - turn `mapTx` into a `boost::multi_index_container` that sorts the mempool on 3 criteria:
    - transaction hash
    - fee rate
    - time in the mempool
  - Add a max size for the mempool (throwing away the cheapest txs and bumping the min relay fee, when full)
  - Implement on-the-fly mempool size limit with the flag `-maxmempool`
  - Implement `-checkmempool=N` to customize the frequency of the mempool check
  - Implement helper for `CTxMemPoolEntry` for the unit tests.


  - bitcoin#6654
  - bitcoin#6722 [`*`]
  - bitcoin#6889
  - bitcoin#6771
  - bitcoin#6776
  - bitcoin#6896
  - bitcoin#7020

  [`*`] excluding bitcoin@9e93640 as our default minimum tx fee rate of 10k satoshis is only 0,00003 USD at the time of writing.

ACKs for top commit:
    utACK 2105947
    Re utACK 2105947 and merging this nice upgrade :) .

Tree-SHA512: 51a7d75bd52f7646d461252c78f0dd9d7e8b5c1c66c22944120bfe293b28f5d48135de339ebf3d8a5b4c61ca5452383ed1b10c417be06dc4a335ac645842ea14
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