readerwriterlock

Cross-process read-write synchronization primative in .NET?

由 房东的猫 提交于 2019-12-30 03:29:05
问题 Is there a read/write locking mechanism that works across processes (similar to Mutex, but read/write instead exclusive locking)? I would like to allow concurrent read access, but exclusive write access. 回答1: No. As Richard noted above, there is no such out of the box mechanism in .NET. This is how to implement it using a mutex and a semaphore. Method #1 is described in http://www.joecheng.com/blog/entries/Writinganinter-processRea.html, quoting: // create or open global mutex GlobalMutex

How would you simplify Entering and Exiting a ReaderWriterLock?

由 本小妞迷上赌 提交于 2019-12-17 23:25:28
问题 This seems very noisy to me. Five lines of overhead is just too much. m_Lock.EnterReadLock() Try Return m_List.Count Finally m_Lock.ExitReadLock() End Try So how would you simply this? 回答1: I was thinking the same, but in C# ;-p using System; using System.Threading; class Program { static void Main() { ReaderWriterLockSlim sync = new ReaderWriterLockSlim(); using (sync.Read()) { // etc } } } public static class ReaderWriterExt { sealed class ReadLockToken : IDisposable { private

What are the real downsides of using ReaderWriterLock

由 拈花ヽ惹草 提交于 2019-12-08 17:45:25
问题 We have project targeted .NET 2.0 RTM (yes, it should be .NET 2.0 RTM, we have some orthodox clients). And I'm just wondering what are the downsides of ReaderWriterLock? Why is it so bad that everyone tell "don't use it, try to use something else like lock statement"? If we could use .NET 3.5, I would definitely use ReaderWriterLockSlim, but with ReaderWriterLock I'm a little scary with all these warning coming from everywhere. Does anybody measured performance or whatever? If there are some

Readers writers problem concurrent Java

由 我的未来我决定 提交于 2019-12-02 02:53:43
问题 This is an implementation of readers writers, i.e. many readers can read but only one writer can write at any one time. Does this work as expected? public class ReadersWriters extends Thread{ static int num_readers = 0; static int writing = 0; public void read_start() throws InterruptedException { synchronized(this.getClass()) { while(writing == 1) wait(); num_readers++; } } public void read_end() { synchronized(this.getClass()) { if(--num_readers == 0) notifyAll(); } } public void write

Readers writers problem concurrent Java

由 浪尽此生 提交于 2019-12-02 02:33:43
This is an implementation of readers writers, i.e. many readers can read but only one writer can write at any one time. Does this work as expected? public class ReadersWriters extends Thread{ static int num_readers = 0; static int writing = 0; public void read_start() throws InterruptedException { synchronized(this.getClass()) { while(writing == 1) wait(); num_readers++; } } public void read_end() { synchronized(this.getClass()) { if(--num_readers == 0) notifyAll(); } } public void write_start() throws InterruptedException{ synchronized(this.getClass()) { while(num_readers > 0) wait(); writing

ReaderWriterLockSlim vs. Monitor

由 半世苍凉 提交于 2019-11-28 07:51:50
I have an IDictionary<TKey,TValue> implementation that internally holds n other Dictionary<TKey, TValue> and distributes that insertions by the HashCode of the key to the invidual sub-dictionaries. With 16 sub-dictionaries, the number of collisions is pretty low on a 4-core machine. For parallel insertions, i locked the Add-method with a ReaderWriterLockSlim , locking only the individual sub-dictionary: public void Add(TKey key, TValue value) { int poolIndex = GetPoolIndex(key); this.locks[poolIndex].EnterWriteLock(); try { this.pools[poolIndex].Add(key, value); } finally { this.locks

ReaderWriterLockSlim vs. Monitor

由 主宰稳场 提交于 2019-11-27 02:00:42
问题 I have an IDictionary<TKey,TValue> implementation that internally holds n other Dictionary<TKey, TValue> and distributes that insertions by the HashCode of the key to the invidual sub-dictionaries. With 16 sub-dictionaries, the number of collisions is pretty low on a 4-core machine. For parallel insertions, i locked the Add-method with a ReaderWriterLockSlim , locking only the individual sub-dictionary: public void Add(TKey key, TValue value) { int poolIndex = GetPoolIndex(key); this.locks
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