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/*
*
* 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::Add(const std::function<void()>& callback) {
grpc::lock_guard<grpc::mutex> lock(mu_);
callbacks_.push(callback);
cv_.notify_one();
}
} // namespace grpc
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