diff options
Diffstat (limited to 'src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs')
-rw-r--r-- | src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs | 98 |
1 files changed, 75 insertions, 23 deletions
diff --git a/src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs b/src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs index 4b7124ee74..a446c1f99f 100644 --- a/src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs +++ b/src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs @@ -33,15 +33,16 @@ using System; using System.Collections.Generic; -using System.Runtime.InteropServices; +using System.Linq; using System.Threading; using System.Threading.Tasks; using Grpc.Core.Logging; +using Grpc.Core.Utils; namespace Grpc.Core.Internal { /// <summary> - /// Pool of threads polling on the same completion queue. + /// Pool of threads polling on a set of completions queues. /// </summary> internal class GrpcThreadPool { @@ -51,25 +52,33 @@ namespace Grpc.Core.Internal readonly object myLock = new object(); readonly List<Thread> threads = new List<Thread>(); readonly int poolSize; + readonly int completionQueueCount; - CompletionQueueSafeHandle cq; + bool stopRequested; - public GrpcThreadPool(GrpcEnvironment environment, int poolSize) + IReadOnlyCollection<CompletionQueueSafeHandle> completionQueues; + + /// <summary> + /// Creates a thread pool threads polling on a set of completions queues. + /// </summary> + /// <param name="environment">Environment.</param> + /// <param name="poolSize">Pool size.</param> + /// <param name="completionQueueCount">Completion queue count.</param> + public GrpcThreadPool(GrpcEnvironment environment, int poolSize, int completionQueueCount) { this.environment = environment; this.poolSize = poolSize; + this.completionQueueCount = completionQueueCount; + GrpcPreconditions.CheckArgument(poolSize >= completionQueueCount, + "Thread pool size cannot be smaller than the number of completion queues used."); } public void Start() { lock (myLock) { - if (cq != null) - { - throw new InvalidOperationException("Already started."); - } - - cq = CompletionQueueSafeHandle.Create(); + GrpcPreconditions.CheckState(completionQueues == null, "Already started."); + completionQueues = CreateCompletionQueueList(environment, completionQueueCount); for (int i = 0; i < poolSize; i++) { @@ -78,53 +87,85 @@ namespace Grpc.Core.Internal } } - public void Stop() + public Task StopAsync() { lock (myLock) { - cq.Shutdown(); + GrpcPreconditions.CheckState(!stopRequested, "Stop already requested."); + stopRequested = true; + + foreach (var cq in completionQueues) + { + cq.Shutdown(); + } + } + + return Task.Run(() => + { foreach (var thread in threads) { thread.Join(); } - cq.Dispose(); + foreach (var cq in completionQueues) + { + cq.Dispose(); + } + }); + } + + /// <summary> + /// Returns true if there is at least one thread pool thread that hasn't + /// already stopped. + /// Threads can either stop because all completion queues shut down or + /// because all foreground threads have already shutdown and process is + /// going to exit. + /// </summary> + internal bool IsAlive + { + get + { + return threads.Any(t => t.ThreadState != ThreadState.Stopped); } } - internal CompletionQueueSafeHandle CompletionQueue + internal IReadOnlyCollection<CompletionQueueSafeHandle> CompletionQueues { get { - return cq; + return completionQueues; } } - private Thread CreateAndStartThread(int i) + private Thread CreateAndStartThread(int threadIndex) { - var thread = new Thread(new ThreadStart(RunHandlerLoop)); - thread.IsBackground = false; + var cqIndex = threadIndex % completionQueues.Count; + var cq = completionQueues.ElementAt(cqIndex); + + var thread = new Thread(new ThreadStart(() => RunHandlerLoop(cq))); + thread.IsBackground = true; + thread.Name = string.Format("grpc {0} (cq {1})", threadIndex, cqIndex); thread.Start(); - thread.Name = "grpc " + i; + return thread; } /// <summary> /// Body of the polling thread. /// </summary> - private void RunHandlerLoop() + private void RunHandlerLoop(CompletionQueueSafeHandle cq) { CompletionQueueEvent ev; do { ev = cq.Next(); - if (ev.type == GRPCCompletionType.OpComplete) + if (ev.type == CompletionQueueEvent.CompletionType.OpComplete) { bool success = (ev.success != 0); IntPtr tag = ev.tag; try { - var callback = environment.CompletionRegistry.Extract(tag); + var callback = cq.CompletionRegistry.Extract(tag); callback(success); } catch (Exception e) @@ -133,7 +174,18 @@ namespace Grpc.Core.Internal } } } - while (ev.type != GRPCCompletionType.Shutdown); + while (ev.type != CompletionQueueEvent.CompletionType.Shutdown); + } + + private static IReadOnlyCollection<CompletionQueueSafeHandle> CreateCompletionQueueList(GrpcEnvironment environment, int completionQueueCount) + { + var list = new List<CompletionQueueSafeHandle>(); + for (int i = 0; i < completionQueueCount; i++) + { + var completionRegistry = new CompletionRegistry(environment); + list.Add(CompletionQueueSafeHandle.Create(completionRegistry)); + } + return list.AsReadOnly(); } } } |