synchronization

问题 I created a simple class that shows what I am trying to do without any noise. Feel free to bash away at my code. That's why I posted it here. public class Throttled : IDisposable { private readonly Action work; private readonly Func<bool> stop; private readonly ManualResetEvent continueProcessing; private readonly Timer throttleTimer; private readonly int throttlePeriod; private readonly int throttleLimit; private int totalProcessed; public Throttled(Action work, Func<bool> stop, int

问题 What data does the Win32 CRITICAL_SECTION contain, and how big is it? This is undocumented and presumably implementation specific, but I'm curious to know 回答1: This is from my installation of Windows Vista SDK: WinNT.h: typedef struct _RTL_CRITICAL_SECTION { PRTL_CRITICAL_SECTION_DEBUG DebugInfo; // // The following three fields control entering and exiting the critical // section for the resource // LONG LockCount; LONG RecursionCount; HANDLE OwningThread; // from the thread's ClientId-

问题 There are two master databases and two read-only copies updated by standard transactional replication. It is needed to map some entity from both read-only databases, lets say that A databases contains orders and B databases contains lines. The problem is that replication to one database can lag behind replication of second database, and at the moment of mapping R-databases will have inconsistent data. For example. We stored 2 orders with lines at 19:00 and 19:03. Mapping process started at 19

问题 If you have multiple assignments of shared variables inside one lock code block, does it necessarily mean that all these changes are immediately visible to other threads, potentially running on other processors once they enter a lock statement on the same object - or is there no such guarantees? A lot of the examples out there shows a single "set" or "get" of a common variable and goes into detail of memory barriers but what happens if a more complicated set of statements are inside?

问题 Issue Description After carefully following the instructions in https://wix.github.io/react-native-navigation/#/docs/Installing, I am getting these errors after completing step 4 for Android: ERROR: Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve project :react-native-navigation. Show Details Affected Modules: app ERROR: Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve project :react-native-navigation. Show Details

问题 I just wanted to know whether the below reorderings are valid one or not under new JMM model Original Code: instanceVar1 = value ;// normal read operation, no volatile synchronized(this) { instanceVar2 = value2; //normal read operation, no volatile } instanceVar3 = value3; //normal read operation, no volatile The above code can be reordered into the following executions. Case 1: synchronized(this) { instanceVar2 = value2; //normal read operation, no volatile instanceVar1 = value ;// normal

问题 I'm looking for some input here. I have a singleton class that contains a value which is updated every few seconds by a method within that class. Right now, access to this value across multiple threads is done via synchronization, which I would like to eliminate. Would this make sense? class DataSegment { private MetricsUpdater metrics = new MetricsUpdater.getInstance(); public String printValues() { StringBuilder sb = new StringBuilder(); sb.append(value1); sb.append(morevalues); sb.append

问题 I want to implement an horizontal RecyclerView inside a vertical RecyclerView . The end result should be like this: So, for each element in the vertical RecyclerView , I need another one in an horizontal way. Kind of like a school schedule, with the Day in the left, and the actual schedule on the right, scroll-able horizontally. I managed to achieve this, by putting an RecyclerView inside of the first RecyclerView item. Everything works perfectly, but all the horizontal RecyclerView s are

问题 I write a thread class called T. My purpose is to make sure only one thread object running at a time. So when the thread object is called, it would check a boolean flag called BUSY. My question is what is the different between private static AtomicBoolean BUSY = new AtomicBoolean(false); and private static boolean BUSY = false; I thought if using the 'static', all object would only check one BUSY boolean variable so that would make sure only one thread object is running. 回答1: You must at

问题 In multi-threading programs, I suspect that when a thread wait(), it does not engage much cpu utilization so that the cpu can swap to process other thread. For example, 100 threads start the same task together comparing to 50 threads actually do the task while other 50 threads wait until all 50 tasks are completed. The latter case cost much less time than the former. Can anyone suggest some readings about this? 回答1: The wait method has two purposes: It will tell the currently executing thread