[jira] [Created] (CB-10666) Native callbacks executing in the middle of other JS functions

["Ralf Kistner (JIRA)" <ji...@apache.org>]

Ralf Kistner created CB-10666:
---------------------------------

             Summary: Native callbacks executing in the middle of other JS functions
                 Key: CB-10666
                 URL: https://issues.apache.org/jira/browse/CB-10666
             Project: Apache Cordova
          Issue Type: Bug
          Components: iOS
            Reporter: Ralf Kistner


In some cases, the native callback seems to happen in the middle of another JS call. Simplified stack trace:

{code}
succeeded@/plugins/io.litehelpers.cordova.sqlcipher/www/SQLitePlugin.js:471:19
handleStatementSuccess@/plugins/io.litehelpers.cordova.sqlcipher/www/SQLitePlugin.js:346:12
/plugins/io.litehelpers.cordova.sqlcipher/www/SQLitePlugin.js:371:38
mycb@/plugins/io.litehelpers.cordova.sqlcipher/www/SQLitePlugin.js:417:20
callbackFromNative@/cordova.js:293:63
/cordova.js:1109:35
nativeEvalAndFetch@/cordova.js:1117:13
nativeCallback@/cordova.js:1106:38
global code@/myindex.html:1:47
removeChild@[native code]
remove@/myscript.js:5506:33
{code}

Often it's not an issue, but in some cases it causes really unexpected behaviour, and can cause the application to malfunction in ways that are hard to debug. See similar issue previously reported for Android: https://issues.apache.org/jira/browse/CB-6181

This happens especially when using a plugin such as SQLite/SQLCipher, which triggers a large number of native callbacks.

There does appear to be some code to handle this case - I'm not sure why it's not working here:
https://github.com/apache/cordova-ios/blob/9513bc6/CordovaLib/Classes/Public/CDVCommandDelegateImpl.m#L90

The SQLite/SQLCipher plugin does appear to be using multithreading, but I haven't confirmed this.

Tested on Cordova-iOS 3.9.2.

A workaround is to wrap all native callbacks in a setTimeout or similar call, but this may have some performance impact.



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