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author | MarcoFalke <falke.marco@gmail.com> | 2020-05-27 19:31:25 -0400 |
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committer | MarcoFalke <falke.marco@gmail.com> | 2020-05-27 19:31:33 -0400 |
commit | 55b4c65bd1d829e799db7fe75fab88691830de43 (patch) | |
tree | 532303edc9167f2a15c705646ce0fa1b95a02bda /src/rpc | |
parent | 9ccaee1d5e2e4b79b0a7c29aadb41b97e4741332 (diff) | |
parent | 5478d6c099e76fe070703cc5383cba7b91468b0f (diff) | |
download | bitcoin-55b4c65bd1d829e799db7fe75fab88691830de43.tar.xz |
Merge #16127: More thread safety annotation coverage
5478d6c099e76fe070703cc5383cba7b91468b0f logging: thread safety annotations (Anthony Towns)
e685ca19928eec4e687c66f5edfcfff085a42c27 util/system.cpp: add thread safety annotations for dir_locks (Anthony Towns)
a7887899480db72328784009181d93904e6d479d test/checkqueue_tests: thread safety annotations (Anthony Towns)
479c5846f7477625ec275fbb8a076c7ef157172b rpc/blockchain.cpp: thread safety annotations for latestblock (Anthony Towns)
8b5af3d4c1270267ad85e78f661bf8fab06f3aad net: fMsgProcWake use LOCK instead of lock_guard (Anthony Towns)
de7c5f41aba860751ef7824245e6d9d5088a1200 wallet/wallet.h: Remove mutexScanning which was only protecting a single atomic bool (Anthony Towns)
c3cf2f55013c4ea1c1ef4a878fc7ff8e92f2c42d rpc/blockchain.cpp: Remove g_utxosetscan mutex that is only protecting a single atomic variable (Anthony Towns)
Pull request description:
In a few cases we need to use `std::mutex` rather than the sync.h primitives. But `std::lock_guard<std::mutex>` doesn't include the clang thread safety annotations unless you also use clang's C library, which means you can't indicate when variables should be guarded by `std::mutex` mutexes.
This adds an annotated version of `std::lock_guard<std::mutex>` to threadsafety.h to fix that, and modifies places where `std::mutex` is used to take advantage of the annotations.
It's based on top of #16112, and turns the thread safety comments included there into annotations.
It also changes the RAII classes in wallet/wallet.h and rpc/blockchain.cpp to just use the atomic<bool> flag for synchronisation rather than having a mutex that doesn't actually guard anything as well.
ACKs for top commit:
MarcoFalke:
ACK 5478d6c099e76fe070703cc5383cba7b91468b0f 🗾
hebasto:
re-ACK 5478d6c099e76fe070703cc5383cba7b91468b0f, only renamed s/`MutexGuard`/`LockGuard`/, and dropped the commit "test/util_threadnames_tests: add thread safety annotations" since the [previous](https://github.com/bitcoin/bitcoin/pull/16127#pullrequestreview-414184113) review.
ryanofsky:
Code review ACK 5478d6c099e76fe070703cc5383cba7b91468b0f. Thanks for taking suggestions! Only changes since last review are dropping thread rename test commit d53072ec730d8eec5a5b72f7e65a54b141e62b19 and renaming mutex guard to lock guard
Tree-SHA512: 7b00d31f6f2b5a222ec69431eb810a74abf0542db3a65d1bbad54e354c40df2857ec89c00b4a5e466c81ba223267ca95f3f98d5fbc1a1d052a2c3a7d2209790a
Diffstat (limited to 'src/rpc')
-rw-r--r-- | src/rpc/blockchain.cpp | 22 |
1 files changed, 9 insertions, 13 deletions
diff --git a/src/rpc/blockchain.cpp b/src/rpc/blockchain.cpp index 7d43de6646..4eb47d7b15 100644 --- a/src/rpc/blockchain.cpp +++ b/src/rpc/blockchain.cpp @@ -52,7 +52,7 @@ struct CUpdatedBlock static Mutex cs_blockchange; static std::condition_variable cond_blockchange; -static CUpdatedBlock latestblock; +static CUpdatedBlock latestblock GUARDED_BY(cs_blockchange); NodeContext& EnsureNodeContext(const util::Ref& context) { @@ -223,7 +223,7 @@ static UniValue getbestblockhash(const JSONRPCRequest& request) void RPCNotifyBlockChange(const CBlockIndex* pindex) { if(pindex) { - std::lock_guard<std::mutex> lock(cs_blockchange); + LOCK(cs_blockchange); latestblock.hash = pindex->GetBlockHash(); latestblock.height = pindex->nHeight; } @@ -258,9 +258,9 @@ static UniValue waitfornewblock(const JSONRPCRequest& request) WAIT_LOCK(cs_blockchange, lock); block = latestblock; if(timeout) - cond_blockchange.wait_for(lock, std::chrono::milliseconds(timeout), [&block]{return latestblock.height != block.height || latestblock.hash != block.hash || !IsRPCRunning(); }); + cond_blockchange.wait_for(lock, std::chrono::milliseconds(timeout), [&block]() EXCLUSIVE_LOCKS_REQUIRED(cs_blockchange) {return latestblock.height != block.height || latestblock.hash != block.hash || !IsRPCRunning(); }); else - cond_blockchange.wait(lock, [&block]{return latestblock.height != block.height || latestblock.hash != block.hash || !IsRPCRunning(); }); + cond_blockchange.wait(lock, [&block]() EXCLUSIVE_LOCKS_REQUIRED(cs_blockchange) {return latestblock.height != block.height || latestblock.hash != block.hash || !IsRPCRunning(); }); block = latestblock; } UniValue ret(UniValue::VOBJ); @@ -300,9 +300,9 @@ static UniValue waitforblock(const JSONRPCRequest& request) { WAIT_LOCK(cs_blockchange, lock); if(timeout) - cond_blockchange.wait_for(lock, std::chrono::milliseconds(timeout), [&hash]{return latestblock.hash == hash || !IsRPCRunning();}); + cond_blockchange.wait_for(lock, std::chrono::milliseconds(timeout), [&hash]() EXCLUSIVE_LOCKS_REQUIRED(cs_blockchange) {return latestblock.hash == hash || !IsRPCRunning();}); else - cond_blockchange.wait(lock, [&hash]{return latestblock.hash == hash || !IsRPCRunning(); }); + cond_blockchange.wait(lock, [&hash]() EXCLUSIVE_LOCKS_REQUIRED(cs_blockchange) {return latestblock.hash == hash || !IsRPCRunning(); }); block = latestblock; } @@ -344,9 +344,9 @@ static UniValue waitforblockheight(const JSONRPCRequest& request) { WAIT_LOCK(cs_blockchange, lock); if(timeout) - cond_blockchange.wait_for(lock, std::chrono::milliseconds(timeout), [&height]{return latestblock.height >= height || !IsRPCRunning();}); + cond_blockchange.wait_for(lock, std::chrono::milliseconds(timeout), [&height]() EXCLUSIVE_LOCKS_REQUIRED(cs_blockchange) {return latestblock.height >= height || !IsRPCRunning();}); else - cond_blockchange.wait(lock, [&height]{return latestblock.height >= height || !IsRPCRunning(); }); + cond_blockchange.wait(lock, [&height]() EXCLUSIVE_LOCKS_REQUIRED(cs_blockchange) {return latestblock.height >= height || !IsRPCRunning(); }); block = latestblock; } UniValue ret(UniValue::VOBJ); @@ -1995,7 +1995,6 @@ bool FindScriptPubKey(std::atomic<int>& scan_progress, const std::atomic<bool>& } /** RAII object to prevent concurrency issue when scanning the txout set */ -static std::mutex g_utxosetscan; static std::atomic<int> g_scan_progress; static std::atomic<bool> g_scan_in_progress; static std::atomic<bool> g_should_abort_scan; @@ -2008,18 +2007,15 @@ public: bool reserve() { CHECK_NONFATAL(!m_could_reserve); - std::lock_guard<std::mutex> lock(g_utxosetscan); - if (g_scan_in_progress) { + if (g_scan_in_progress.exchange(true)) { return false; } - g_scan_in_progress = true; m_could_reserve = true; return true; } ~CoinsViewScanReserver() { if (m_could_reserve) { - std::lock_guard<std::mutex> lock(g_utxosetscan); g_scan_in_progress = false; } } |