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This commit is contained in:
Kovid Goyal 2013-10-17 15:31:09 +05:30
parent dba9397a5e
commit 28ca52be0b
1 changed files with 7 additions and 2 deletions
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9
src/calibre/db/cache.py
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@ -57,7 +57,7 @@ def call_func_with_lock(*args, **kwargs):
return func(*args, **kwargs)
except DowngradeLockError:
# We already have an exclusive lock, no need to acquire a shared
# lock. See the safe_read_lock properties documentation for why
# lock. See the safe_read_lock properties' documentation for why
# this is necessary.
return func(*args, **kwargs)
return call_func_with_lock
@ -123,7 +123,12 @@ def safe_read_lock(self):
search cache in the presence of composite columns. Updating the search
cache holds an exclusive lock, but searching a composite column
involves reading field values via ProxyMetadata which tries to get a
shared lock. There may be other scenarios that trigger this as well. '''
shared lock. There may be other scenarios that trigger this as well.
This property returns a new lock object on every access. This lock
object is not recursive (for performance) and must only be used in a
with statement as ``with cache.safe_read_lock:`` otherwise bad things
will happen.'''
return SafeReadLock(self.read_lock)
@write_api