1 files changed, 86 insertions, 0 deletions
diff --git a/src/cpp/server/fixed_size_thread_pool.cc b/src/cpp/server/fixed_size_thread_pool.cc
new file mode 100644
index 0000000000..710bcbb573
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+++ b/src/cpp/server/fixed_size_thread_pool.cc
@@ -0,0 +1,86 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc++/impl/sync.h>
+#include <grpc++/impl/thd.h>
+#include <grpc++/fixed_size_thread_pool.h>
+
+namespace grpc {
+
+void FixedSizeThreadPool::ThreadFunc() {
+  for (;;) {
+    // Wait until work is available or we are shutting down.
+    grpc::unique_lock<grpc::mutex> lock(mu_);
+    if (!shutdown_ && callbacks_.empty()) {
+      cv_.wait(lock);
+    }
+    // Drain callbacks before considering shutdown to ensure all work
+    // gets completed.
+    if (!callbacks_.empty()) {
+      auto cb = callbacks_.front();
+      callbacks_.pop();
+      lock.unlock();
+      cb();
+    } else if (shutdown_) {
+      return;
+    }
+  }
+}
+
+FixedSizeThreadPool::FixedSizeThreadPool(int num_threads) : shutdown_(false) {
+  for (int i = 0; i < num_threads; i++) {
+    threads_.push_back(
+        new grpc::thread(&FixedSizeThreadPool::ThreadFunc, this));
+  }
+}
+
+FixedSizeThreadPool::~FixedSizeThreadPool() {
+  {
+    grpc::lock_guard<grpc::mutex> lock(mu_);
+    shutdown_ = true;
+    cv_.notify_all();
+  }
+  for (auto t = threads_.begin(); t != threads_.end(); t++) {
+    (*t)->join();
+    delete *t;
+  }
+}
+
+void FixedSizeThreadPool::ScheduleCallback(
+    const std::function<void()>& callback) {
+  grpc::lock_guard<grpc::mutex> lock(mu_);
+  callbacks_.push(callback);
+  cv_.notify_one();
+}
+
+}  // namespace grpc