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msvcdeps: refactor cache lock 

Rework how msvcdeps' cached_nodes lock is used so acquiring the lock is
only necessary on a cache miss. Also use a "with" context manager to
simplify management of the lock lifecycle.
This commit is contained in:
Michael Vincent 2019-04-25 16:28:19 -05:00
parent e874342103
commit 8b5a2a2086
1 changed files with 8 additions and 5 deletions
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13
waflib/extras/msvcdeps.py
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@ -64,14 +64,17 @@ def path_to_node(base_node, path, cached_nodes):
else:
# Not hashable, assume it is a list and join into a string
node_lookup_key = (base_node, os.path.sep.join(path))
try:
lock.acquire()
node = cached_nodes[node_lookup_key]
except KeyError:
node = base_node.find_resource(path)
cached_nodes[node_lookup_key] = node
finally:
lock.release()
# retry with lock on cache miss
with lock:
try:
node = cached_nodes[node_lookup_key]
except KeyError:
node = cached_nodes[node_lookup_key] = base_node.find_resource(path)
return node
def post_run(self):