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Better lock protection of shared instance and cleanup at exit

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This commit is contained in:
rfm 2025-03-27 09:57:28 +00:00
parent ce9699d5c5
commit 9fadc19f8c
1 changed files with 23 additions and 4 deletions
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27
Source/NSUserDefaults.m
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@ -661,7 +661,9 @@ newLanguages(NSArray *oldNames)
+ (void) atExit
{
[classLock lock];
DESTROY(sharedDefaults);
[classLock unlock];
DESTROY(bundleIdentifier);
DESTROY(processName);
DESTROY(argumentsDictionary);
@ -842,11 +844,13 @@ newLanguages(NSArray *oldNames)
NS_ENDHANDLER
if (nil != regDefs)
{
[self standardUserDefaults];
if (sharedDefaults != nil)
NSUserDefaults *defs = [self standardUserDefaults];
if (defs != nil)
{
[sharedDefaults->_tempDomains setObject: regDefs
forKey: NSRegistrationDomain];
[defs->_lock lock];
[defs->_tempDomains setObject: regDefs forKey: NSRegistrationDomain];
[defs->_lock unlock];
}
}
}
@ -1353,6 +1357,21 @@ newLanguages(NSArray *oldNames)
return [self initWithContentsOfFile: path];
}
/* This code ensures that, if the shared instance is about to be deallocated
* we clear the sharedDefaults variable first so that no other thread can
* grab a reference to the deallocated instance.
*/
- (void) release
{
[classLock lock];
if (self == sharedDefaults && [self retainCount] < 2)
{
sharedDefaults = nil;
}
[classLock unlock];
[super release];
}
- (void) dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver: self];