readLock.lock(); This means that if any other thread is writing (i.e. holds a write lock) then stop here until no other thread is writing. Once the lock is granted no other thread will be allowed to write (i.e. take a write lock) until the lock is released. writeLock.lock(); This means that if any other thread … Read more
Maybe a simple bank situation. class Account { double balance; void withdraw(double amount){ balance -= amount; } void deposit(double amount){ balance += amount; } void transfer(Account from, Account to, double amount){ sync(from); sync(to); from.withdraw(amount); to.deposit(amount); release(to); release(from); } } Obviously, should there be two threads which attempt to run transfer(a, b) and transfer(b, a) at … Read more
This is expected behaviour of pipes. It is supposed to hang untill other process connects to the pipe and reads it.
For example, review this question: Loader lock error The general idea of loader lock: The system runs the code in DllMain inside a lock (as in – synchronization lock). Therefore, running non-trivial code inside DllMain is “asking for a deadlock” Answer I’ve mentioned is based on this article: Another reason not to do anything scary … Read more
[*] To enable lockdep feature, edit .config file through menuconfig: make menuconfig And enable following in Hacking Options: 1. [*] Detect Hard and Soft Lockups 2. [*] Detect Hung Tasks 3. [*] RT Mutex debugging, deadlock detection 4. -*- Spinlock and rw-lock debugging: basic checks 5. -*- Mutex debugging: basic checks 6. -*- Lock debugging: … Read more
First, I would review my SQL 2000 code and get to the bottom of why this deadlock is happening. Fixing this may be hiding a bigger problem (Eg. missing index or bad query). Second I would review my architecture to confirm the deadlocking statement really needs to be called that frequently (Does select count(*) from … Read more
Lock is a questionable idea in JS which is intended to be threadless and not needing concurrency protection. You’re looking to combine calls on deferred execution. The pattern I follow for this is the use of callbacks. Something like this: var functionLock = false; var functionCallbacks = []; var lockingFunction = function (callback) { if … Read more
Try it with an AsyncTask like this: AsyncTask<Void, Void, String> task = new AsyncTask<Void, Void, String>() { @Override protected String doInBackground(Void… params) { String token = null; try { token = GoogleAuthUtil.getToken( MainActivity.this, mGoogleApiClient.getAccountName(), “oauth2:” + SCOPES); } catch (IOException transientEx) { // Network or server error, try later Log.e(TAG, transientEx.toString()); } catch (UserRecoverableAuthException e) … Read more
Writing deadlock-proof code is really hard. Even when you access the tables in the same order you may still get deadlocks [1]. I wrote a post on my blog that elaborates through some approaches that will help you avoid and resolve deadlock situations. If you want to ensure two statements/transactions will never deadlock you may … Read more
The problem you describe is not handled by the database, and from my experience is not entirely handled by Hibernate either. You have to take explicit steps to avoid it being a problem. Hibernate does some of the work for you. As per the previous answer, Hibernate ensures that within an isolated flush the inserts, … Read more