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Merge #16716: wallet: Use wallet name instead of pointer on unload/release

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d9d8984270 wallet: Use wallet name instead of pointer on unload/release (João Barbosa)

Pull request description:

  Fixes #16668. Wallet name is unique so it can be used instead of pointer.

ACKs for top commit:
  meshcollider:
    utACK d9d8984270
  instagibbs:
    utACK d9d8984270
  ryanofsky:
    utACK d9d8984270. Alternately I think it might be possible to use an intptr_t set instead of a string set to get around the undefined behavior described in the issue.

Tree-SHA512: eccd4d260cd4c02b52c30deeb32dbfd190a1151a5340eb3aa4ece0dc6ae3b3ed746ce5617336461f6f27c437c435629cd07d20beb1c5450f23b75edde6728598
This commit is contained in:
fanquake 2019-08-31 08:50:17 +08:00
commit e9ef1b2c2e
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GPG key ID: 2EEB9F5CC09526C1
1 changed files with 7 additions and 6 deletions
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13
src/wallet/wallet.cpp
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@ -93,13 +93,14 @@ std::shared_ptr<CWallet> GetWallet(const std::string& name)
static Mutex g_wallet_release_mutex;
static std::condition_variable g_wallet_release_cv;
static std::set<CWallet*> g_unloading_wallet_set;
static std::set<std::string> g_unloading_wallet_set;
// Custom deleter for shared_ptr<CWallet>.
static void ReleaseWallet(CWallet* wallet)
{
// Unregister and delete the wallet right after BlockUntilSyncedToCurrentChain
// so that it's in sync with the current chainstate.
const std::string name = wallet->GetName();
wallet->WalletLogPrintf("Releasing wallet\n");
wallet->BlockUntilSyncedToCurrentChain();
wallet->Flush();
@ -108,7 +109,7 @@ static void ReleaseWallet(CWallet* wallet)
// Wallet is now released, notify UnloadWallet, if any.
{
LOCK(g_wallet_release_mutex);
if (g_unloading_wallet_set.erase(wallet) == 0) {
if (g_unloading_wallet_set.erase(name) == 0) {
// UnloadWallet was not called for this wallet, all done.
return;
}
@ -119,21 +120,21 @@ static void ReleaseWallet(CWallet* wallet)
void UnloadWallet(std::shared_ptr<CWallet>&& wallet)
{
// Mark wallet for unloading.
CWallet* pwallet = wallet.get();
const std::string name = wallet->GetName();
{
LOCK(g_wallet_release_mutex);
auto it = g_unloading_wallet_set.insert(pwallet);
auto it = g_unloading_wallet_set.insert(name);
assert(it.second);
}
// The wallet can be in use so it's not possible to explicitly unload here.
// Notify the unload intent so that all remaining shared pointers are
// released.
pwallet->NotifyUnload();
wallet->NotifyUnload();
// Time to ditch our shared_ptr and wait for ReleaseWallet call.
wallet.reset();
{
WAIT_LOCK(g_wallet_release_mutex, lock);
while (g_unloading_wallet_set.count(pwallet) == 1) {
while (g_unloading_wallet_set.count(name) == 1) {
g_wallet_release_cv.wait(lock);
}
}