synchronization

问题 threadA go through this snippet { global_a = 100; // 1 { pthread_mutex_lock(&b_mutex) ... pthread_mutex_unlock(&b_mutex) } // 2 } threadB go through this snippet { { pthread_mutex_lock(&b_mutex) ... pthread_mutex_unlock(&b_mutex) } // 3 int tmp = global_a; // 4 } and suppose that from an observer view the execution sequence indeed is threadA --- 1 threadA --- 2 threadB --- 3 threadB --- 4 Can the code at threadB "int tmp = global_a;" see what threadA set at "global_a = 100;" ? Any suggestion

问题 In a farm environment, is there a preferred technique for keeping files created/updated/deleted on one server in sync with all of the other servers in the farm? For example, if a file is created by a user on Server A, and that file is requested by a user on Server B, what is the best way for ensuring that the file is accessible on both servers, simultaneously? Does the same answer apply for many (1,000+) servers in a farm? Although my particular question applies mainly to Windows servers, it

问题 Which Git then proceeded to sync (overwrite) files from my repository (not github), to my local files. I have lost an entire day or more of work. Is there a way to revert what happened? What did happen? I am side myself. Rich 回答1: If the application stashed the changes instead of removing them you will be able to restore it. Try this: git stash list Hopefully you'll get an output stash@{0}: ... , which should be easily restored with: git stash apply However if there is more than one stash you

问题 I want to archive that various transaction controller(TA) with containing HTTP requests are always fired at the same time for each loop. Currently, he's just sending the first TA synchronized and the second one varies between 1-5 sec. JMeter Setup: Thread Group: 5 Threads, 0 Ramp up, 5 Loops Synchronizing Timer: 0 and 30000 Timeout Result View Results in Table(Filtered with Excel for Transaction Controller) 回答1: You're misusing Synchronizing Timer. If you want to group samplers you need to

问题 I'm using an AbstractThreadedSyncAdapter to synchronize some data with my server. I'm using SyncResult to indicate if there's been an error while performing the synchronization: syncResult.stats.numParseExceptions++; I initialize the SyncAdapter like this: Bundle params = new Bundle(); params.putBoolean(ContentResolver.SYNC_EXTRAS_EXPEDITED, false); params.putBoolean(ContentResolver.SYNC_EXTRAS_DO_NOT_RETRY, false); params.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, false); ContentResolver

问题 I have a problem with the logic of my synchronization. Client Database Table Column: - LastSync (Datetime - This tracks when the last sync occurs) - LastUpdated (Datetime - This tracks when the data is last updated regardless if its the client or server who updated the data) Server Database Table Column: - ServerUpdate (Datetime - This tracks when the server last updated the data) - ClientUpdate (Datetime - This tracks when the client/user updated the data) My problem: To keep the client/user

问题 There is a button "Upload All Outgoing Changes" in Synchronize panel of eclipse. Any way to "click" it without mouse? There is no such action in prefs->general->keys 回答1: I created an Auto Hot Key file just for this. http://www.autohotkey.com/ I hope you like it! ; Eclipse Synchronize Override Upload ; AutoHotkey Version: 1.x ; Language: English ; Platform: Win9x/NT ; Author: Taylor York <taylor@tyec.co> ; ; Script Function: ; Upload Files to the Synchronize Window in Eclipse ; ;#NoTrayIcon

问题 I have a class that exposes two methods: - GetObject Gets a single object, or returns null if there are none. - WaitForObject Gets a single object, or waits until their is one. An example implementation: class MyClass { MyStack stack; public object GetObject() { return stack.Pop(); } public object WaitForObject() { object returnValue; while (returnValue == null) returnValue = stack.Pop() return returnValue } } With the assumption that MyStack is thread safe, how can I make MyClass thread safe

问题 I see the benefit of asynchronous commands (waiting for server responses...) but in my flex app it creates me more problem than anything. Here's what I want: EVERY command executes only after the previous one returned (to result or fault function) And I'd like to do this as easily as possible.. by the way the GUI must become irresponsive (maybe a wait message) while a long command is being executed (I could show the wait message in the execute function and remove it in the fault or result

问题 For example, 3 users are streaming a video from a remote url. 1 user is master, and can play, pause, and set the current playback position. They are talking to each other while they watch (voip), so their video streams need to be synced. A solution off the top of my head is that the master broadcasts high-level actions (play, stop, scrub position). For minor deviations, the clients could regularly ping the master to get his playback position, and to apply a speed factor to their playback to