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| author | Wladimir J. van der Laan <laanwj@protonmail.com> | 2020-03-31 14:25:04 +0200 |
|---|---|---|
| committer | Wladimir J. van der Laan <laanwj@protonmail.com> | 2020-03-31 15:07:06 +0200 |
| commit | 9a2b5f22c1f603a6e3abc16dbf074c8d33a8d01f (patch) | |
| tree | 670aad25a0b3916ae7cc5608c8be2fbff31cdb84 /src/qt/walletcontroller.cpp | |
| parent | f2880e21eff2428615ee3024570c4861d3238107 (diff) | |
| parent | 41b0baf43c243b64b394e774e336475a489cca2b (diff) | |
Merge #18338: Fix wallet unload race condition
41b0baf43c243b64b394e774e336475a489cca2b gui: Handle WalletModel::unload asynchronous (João Barbosa)
ab31b9d6fe7b39713682e3f52d11238dbe042c16 Fix wallet unload race condition (Russell Yanofsky)
Pull request description:
This PR consists in two fixes. The first fixes a concurrency issues with `boost::signals2`. The second fixes a wallet model destruction while it's being used.
From boost signal documentation at https://www.boost.org/doc/libs/1_72_0/doc/html/signals2/thread-safety.html:
> When a signal is invoked by calling signal::operator(), the invocation first acquires a lock on the signal's mutex. Then it obtains a handle to the signal's slot list and combiner. Next it releases the signal's mutex, before invoking the combiner to iterate through the slot list.
This means that `UnregisterValidationInterface` doesn't prevent more calls to that interface. The fix consists in capturing the `shared_ptr<CValidationInterface>` in each internal slot.
The GUI bug is fixed by using a `Qt::QueuedConnection` in the `WalletModel::unload` connection.
ACKs for top commit:
ryanofsky:
Code review ACK 41b0baf43c243b64b394e774e336475a489cca2b. Only change is moving assert as suggested
hebasto:
ACK 41b0baf43c243b64b394e774e336475a489cca2b, tested on Linux Mint 19.3.
Tree-SHA512: 4f712d8de65bc1214411831250de5dc0a9fd505fb84da5baf9f2cc4d551bc3abffc061616f00afe43dba7525af2cd96c9b54aeead9383145e3b8801f25d85f50
Diffstat (limited to 'src/qt/walletcontroller.cpp')
| -rw-r--r-- | src/qt/walletcontroller.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/qt/walletcontroller.cpp b/src/qt/walletcontroller.cpp index 233c0ab6be..88c694567e 100644 --- a/src/qt/walletcontroller.cpp +++ b/src/qt/walletcontroller.cpp @@ -116,7 +116,7 @@ WalletModel* WalletController::getOrCreateWallet(std::unique_ptr<interfaces::Wal const bool called = QMetaObject::invokeMethod(wallet_model, "startPollBalance"); assert(called); - connect(wallet_model, &WalletModel::unload, [this, wallet_model] { + connect(wallet_model, &WalletModel::unload, this, [this, wallet_model] { // Defer removeAndDeleteWallet when no modal widget is active. // TODO: remove this workaround by removing usage of QDiallog::exec. if (QApplication::activeModalWidget()) { @@ -128,7 +128,7 @@ WalletModel* WalletController::getOrCreateWallet(std::unique_ptr<interfaces::Wal } else { removeAndDeleteWallet(wallet_model); } - }); + }, Qt::QueuedConnection); // Re-emit coinsSent signal from wallet model. connect(wallet_model, &WalletModel::coinsSent, this, &WalletController::coinsSent); |