synchronization

I understand the concept of locks, mutex and other synchronization structures, but how are they implemented? Are they provided by the OS, or are these structures dependent on special CPU instructions for the CPUs MMU? James Black You may want to look at these links, but the main one is the Test-and-set on Wikipedia: http://en.wikipedia.org/wiki/Test-and-set How are mutexes implemented? You can also look at this patent: http://www.faqs.org/patents/app/20080222331 Most mutual exclusion and synchronization mechanisms use hardware atomic operations, as others have pointed out. However, it is

The following code is taken from the JavaDoc of Condition : class BoundedBuffer { final Lock lock = new ReentrantLock(); final Condition notFull = lock.newCondition(); final Condition notEmpty = lock.newCondition(); final Object[] items = new Object[100]; int putptr, takeptr, count; public void put(Object x) throws InterruptedException { lock.lock(); try { while (count == items.length) notFull.await(); items[putptr] = x; if (++putptr == items.length) putptr = 0; ++count; notEmpty.signal(); } finally { lock.unlock(); } } public Object take() throws InterruptedException { lock.lock(); try {

I have an application where I have a shared resource (a Motion system) which can be accessed by multiple clients. I have individual Operations that require access to the system for the duration of the move and which should throw 'Busy' exceptions if conflicting operations are requested at the same time. I also have Sequencers which need to acquire exclusive access to the Motion system for the execution of several Operations, interspersed with other actions; during the entire sequence, no other clients should be able to run Operations. I've traditionally approached this using Thread-affinity,

I have some issues with the following code: package main import ( "fmt" "sync" ) // This program should go to 11, but sometimes it only prints 1 to 10. func main() { ch := make(chan int) var wg sync.WaitGroup wg.Add(2) go Print(ch, wg) // go func(){ for i := 1; i <= 11; i++ { ch <- i } close(ch) defer wg.Done() }() wg.Wait() //deadlock here } // Print prints all numbers sent on the channel. // The function returns when the channel is closed. func Print(ch <-chan int, wg sync.WaitGroup) { for n := range ch { // reads from channel until it's closed fmt.Println(n) } defer wg.Done() } I get a

There are several ways to handle synchronization in Vulkan. This is how I understand it: Fences are GPU to CPU syncs. Semaphores are GPU to GPU syncs, they are used to sync queue submissions (on the same or different queues). Events are more general, reset and checked on both CPU and GPU. Barriers are used for synchronization inside a command buffer. In my case I have two command buffers. And I want the second command buffer to execute after the first one. submitInfo.pCommandBuffers = &firstCommandBuffer; vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE); // wait for first command buffer to

In Visual Studio 2012, we have Schema Compare in SSDT 's SQL Server Database Project (DbProject) project which helps Compare source versus target Update target to make it the same as source Where Source and target can be either a database, a DbProject project, or a .dacpac file Update can be done via an update action or generated script My question is that is it possible to have and where can I get the command-line/API interface to call this feature? SOURCE Database sqlpackage.exe /a:Extract /scs:Server=%Server%;Database=AspBaselineDB; /tf:%DriveSpec%\%DacPath%\%AspBaselineDB%_baseline.dacpac