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blockchain.py: maybe fix rare deadlock

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Saw a deadlock near a swap_with_parent(), could not reproduce.
get_branch_size() and get_parent_heights() could have been the culprits as
they take locks in differing orders and are called from gui/network threads.
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SomberNight 2020-08-25 20:29:08 +02:00
parent 36178df875
commit 4acf884790
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GPG key ID: B33B5F232C6271E9
1 changed files with 2 additions and 2 deletions
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4
electrum/blockchain.py
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@ -86,7 +86,7 @@ def hash_raw_header(header: str) -> str:
# key: blockhash hex at forkpoint
# the chain at some key is the best chain that includes the given hash
blockchains = {} # type: Dict[str, Blockchain]
blockchains_lock = threading.RLock()
blockchains_lock = threading.RLock() # lock order: take this last; so after Blockchain.lock
def read_blockchains(config: 'SimpleConfig'):
@ -222,7 +222,7 @@ class Blockchain(Logger):
def get_parent_heights(self) -> Mapping['Blockchain', int]:
"""Returns map: (parent chain -> height of last common block)"""
with blockchains_lock:
with self.lock, blockchains_lock:
result = {self: self.height()}
chain = self
while True: