mirror of https://github.com/grpc/grpc.git
Sree Kuchibhotla
8 years ago
committed by
GitHub
commit
1c55919ece
22 changed files with 1203 additions and 198 deletions
@ -0,0 +1,181 @@ |
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/*
|
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* |
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* Copyright 2016, Google Inc. |
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* All rights reserved. |
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* |
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* 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 |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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|
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#include <grpc++/impl/sync.h> |
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#include <grpc++/impl/thd.h> |
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#include <grpc/support/log.h> |
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#include <climits> |
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#include "src/cpp/thread_manager/thread_manager.h" |
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namespace grpc { |
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ThreadManager::WorkerThread::WorkerThread(ThreadManager* thd_mgr) |
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: thd_mgr_(thd_mgr), thd_(&ThreadManager::WorkerThread::Run, this) {} |
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|
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void ThreadManager::WorkerThread::Run() { |
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thd_mgr_->MainWorkLoop(); |
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thd_mgr_->MarkAsCompleted(this); |
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} |
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|
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ThreadManager::WorkerThread::~WorkerThread() { thd_.join(); } |
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|
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ThreadManager::ThreadManager(int min_pollers, int max_pollers) |
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: shutdown_(false), |
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num_pollers_(0), |
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min_pollers_(min_pollers), |
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max_pollers_(max_pollers == -1 ? INT_MAX : max_pollers), |
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num_threads_(0) {} |
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|
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ThreadManager::~ThreadManager() { |
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{ |
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std::unique_lock<grpc::mutex> lock(mu_); |
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GPR_ASSERT(num_threads_ == 0); |
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} |
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|
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CleanupCompletedThreads(); |
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} |
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|
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void ThreadManager::Wait() { |
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std::unique_lock<grpc::mutex> lock(mu_); |
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while (num_threads_ != 0) { |
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shutdown_cv_.wait(lock); |
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} |
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} |
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|
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void ThreadManager::Shutdown() { |
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std::unique_lock<grpc::mutex> lock(mu_); |
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shutdown_ = true; |
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} |
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|
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bool ThreadManager::IsShutdown() { |
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std::unique_lock<grpc::mutex> lock(mu_); |
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return shutdown_; |
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} |
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void ThreadManager::MarkAsCompleted(WorkerThread* thd) { |
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{ |
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std::unique_lock<grpc::mutex> list_lock(list_mu_); |
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completed_threads_.push_back(thd); |
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} |
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grpc::unique_lock<grpc::mutex> lock(mu_); |
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num_threads_--; |
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if (num_threads_ == 0) { |
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shutdown_cv_.notify_one(); |
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} |
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} |
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|
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void ThreadManager::CleanupCompletedThreads() { |
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std::unique_lock<grpc::mutex> lock(list_mu_); |
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for (auto thd = completed_threads_.begin(); thd != completed_threads_.end(); |
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thd = completed_threads_.erase(thd)) { |
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delete *thd; |
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} |
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} |
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|
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void ThreadManager::Initialize() { |
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for (int i = 0; i < min_pollers_; i++) { |
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MaybeCreatePoller(); |
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} |
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} |
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|
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// If the number of pollers (i.e threads currently blocked in PollForWork()) is
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// less than max threshold (i.e max_pollers_) and the total number of threads is
|
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// below the maximum threshold, we can let the current thread continue as poller
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bool ThreadManager::MaybeContinueAsPoller() { |
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std::unique_lock<grpc::mutex> lock(mu_); |
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if (shutdown_ || num_pollers_ > max_pollers_) { |
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return false; |
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} |
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num_pollers_++; |
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return true; |
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} |
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|
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// Create a new poller if the current number of pollers i.e num_pollers_ (i.e
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// threads currently blocked in PollForWork()) is below the threshold (i.e
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// min_pollers_) and the total number of threads is below the maximum threshold
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void ThreadManager::MaybeCreatePoller() { |
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grpc::unique_lock<grpc::mutex> lock(mu_); |
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if (!shutdown_ && num_pollers_ < min_pollers_) { |
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num_pollers_++; |
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num_threads_++; |
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|
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// Create a new thread (which ends up calling the MainWorkLoop() function
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new WorkerThread(this); |
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} |
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} |
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|
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void ThreadManager::MainWorkLoop() { |
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void* tag; |
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bool ok; |
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|
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/*
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1. Poll for work (i.e PollForWork()) |
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2. After returning from PollForWork, reduce the number of pollers by 1. If |
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PollForWork() returned a TIMEOUT, then it may indicate that we have more |
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polling threads than needed. Check if the number of pollers is greater |
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than min_pollers and if so, terminate the thread. |
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3. Since we are short of one poller now, see if a new poller has to be |
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created (i.e see MaybeCreatePoller() for more details) |
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4. Do the actual work (DoWork()) |
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5. After doing the work, see it this thread can resume polling work (i.e |
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see MaybeContinueAsPoller() for more details) */ |
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do { |
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WorkStatus work_status = PollForWork(&tag, &ok); |
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{ |
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grpc::unique_lock<grpc::mutex> lock(mu_); |
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num_pollers_--; |
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if (work_status == TIMEOUT && num_pollers_ > min_pollers_) { |
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break; |
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} |
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} |
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|
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// Note that MaybeCreatePoller does check for shutdown and creates a new
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// thread only if ThreadManager is not shutdown
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if (work_status == WORK_FOUND) { |
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MaybeCreatePoller(); |
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DoWork(tag, ok); |
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} |
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} while (MaybeContinueAsPoller()); |
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CleanupCompletedThreads(); |
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// If we are here, either ThreadManager is shutting down or it already has
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// enough threads.
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} |
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|
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} // namespace grpc
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@ -0,0 +1,159 @@ |
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/*
|
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* |
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* Copyright 2016, Google Inc. |
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* All rights reserved. |
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* |
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* 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. |
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* |
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*/ |
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|
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#ifndef GRPC_INTERNAL_CPP_THREAD_MANAGER_H |
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#define GRPC_INTERNAL_CPP_THREAD_MANAGER_H |
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#include <list> |
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#include <memory> |
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#include <grpc++/impl/sync.h> |
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#include <grpc++/impl/thd.h> |
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#include <grpc++/support/config.h> |
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namespace grpc { |
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class ThreadManager { |
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public: |
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explicit ThreadManager(int min_pollers, int max_pollers); |
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virtual ~ThreadManager(); |
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|
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// Initializes and Starts the Rpc Manager threads
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void Initialize(); |
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// The return type of PollForWork() function
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enum WorkStatus { WORK_FOUND, SHUTDOWN, TIMEOUT }; |
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// "Polls" for new work.
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// If the return value is WORK_FOUND:
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// - The implementaion of PollForWork() MAY set some opaque identifier to
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// (identify the work item found) via the '*tag' parameter
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// - The implementaion MUST set the value of 'ok' to 'true' or 'false'. A
|
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// value of 'false' indicates some implemenation specific error (that is
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// neither SHUTDOWN nor TIMEOUT)
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// - ThreadManager does not interpret the values of 'tag' and 'ok'
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// - ThreadManager WILL call DoWork() and pass '*tag' and 'ok' as input to
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// DoWork()
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//
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// If the return value is SHUTDOWN:,
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// - ThreadManager WILL NOT call DoWork() and terminates the thead
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//
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// If the return value is TIMEOUT:,
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// - ThreadManager WILL NOT call DoWork()
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// - ThreadManager MAY terminate the thread depending on the current number
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// of active poller threads and mix_pollers/max_pollers settings
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// - Also, the value of timeout is specific to the derived class
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// implementation
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virtual WorkStatus PollForWork(void** tag, bool* ok) = 0; |
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|
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// The implementation of DoWork() is supposed to perform the work found by
|
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// PollForWork(). The tag and ok parameters are the same as returned by
|
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// PollForWork()
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//
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// The implementation of DoWork() should also do any setup needed to ensure
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// that the next call to PollForWork() (not necessarily by the current thread)
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// actually finds some work
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virtual void DoWork(void* tag, bool ok) = 0; |
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|
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// Mark the ThreadManager as shutdown and begin draining the work. This is a
|
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// non-blocking call and the caller should call Wait(), a blocking call which
|
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// returns only once the shutdown is complete
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void Shutdown(); |
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|
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// Has Shutdown() been called
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bool IsShutdown(); |
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|
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// A blocking call that returns only after the ThreadManager has shutdown and
|
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// all the threads have drained all the outstanding work
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void Wait(); |
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|
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private: |
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// Helper wrapper class around std::thread. This takes a ThreadManager object
|
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// and starts a new std::thread to calls the Run() function.
|
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//
|
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// The Run() function calls ThreadManager::MainWorkLoop() function and once
|
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// that completes, it marks the WorkerThread completed by calling
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// ThreadManager::MarkAsCompleted()
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class WorkerThread { |
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public: |
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WorkerThread(ThreadManager* thd_mgr); |
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~WorkerThread(); |
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|
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private: |
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// Calls thd_mgr_->MainWorkLoop() and once that completes, calls
|
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// thd_mgr_>MarkAsCompleted(this) to mark the thread as completed
|
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void Run(); |
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|
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ThreadManager* thd_mgr_; |
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grpc::thread thd_; |
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}; |
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|
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// The main funtion in ThreadManager
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void MainWorkLoop(); |
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|
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// Create a new poller if the number of current pollers is less than the
|
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// minimum number of pollers needed (i.e min_pollers).
|
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void MaybeCreatePoller(); |
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|
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// Returns true if the current thread can resume as a poller. i.e if the
|
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// current number of pollers is less than the max_pollers.
|
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bool MaybeContinueAsPoller(); |
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|
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void MarkAsCompleted(WorkerThread* thd); |
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void CleanupCompletedThreads(); |
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|
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// Protects shutdown_, num_pollers_ and num_threads_
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// TODO: sreek - Change num_pollers and num_threads_ to atomics
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grpc::mutex mu_; |
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|
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bool shutdown_; |
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grpc::condition_variable shutdown_cv_; |
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|
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// Number of threads doing polling
|
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int num_pollers_; |
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|
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// The minimum and maximum number of threads that should be doing polling
|
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int min_pollers_; |
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int max_pollers_; |
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|
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// The total number of threads (includes threads includes the threads that are
|
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// currently polling i.e num_pollers_)
|
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int num_threads_; |
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|
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grpc::mutex list_mu_; |
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std::list<WorkerThread*> completed_threads_; |
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}; |
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|
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} // namespace grpc
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|
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#endif // GRPC_INTERNAL_CPP_THREAD_MANAGER_H
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@ -0,0 +1,136 @@ |
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/*
|
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* |
||||
* Copyright 2016, 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. |
||||
*is % allowed in string |
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*/ |
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|
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#include <memory> |
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#include <string> |
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|
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#include <gflags/gflags.h> |
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#include <grpc++/grpc++.h> |
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#include <grpc/support/log.h> |
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#include <grpc/support/port_platform.h> |
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|
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#include "src/cpp/thread_manager/thread_manager.h" |
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#include "test/cpp/util/test_config.h" |
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|
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namespace grpc { |
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class ThreadManagerTest GRPC_FINAL : public grpc::ThreadManager { |
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public: |
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ThreadManagerTest() |
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: ThreadManager(kMinPollers, kMaxPollers), |
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num_do_work_(0), |
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num_poll_for_work_(0), |
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num_work_found_(0) {} |
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|
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grpc::ThreadManager::WorkStatus PollForWork(void **tag, |
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bool *ok) GRPC_OVERRIDE; |
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void DoWork(void *tag, bool ok) GRPC_OVERRIDE; |
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void PerformTest(); |
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|
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private: |
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void SleepForMs(int sleep_time_ms); |
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|
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static const int kMinPollers = 2; |
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static const int kMaxPollers = 10; |
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|
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static const int kPollingTimeoutMsec = 10; |
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static const int kDoWorkDurationMsec = 1; |
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|
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// PollForWork will return SHUTDOWN after these many number of invocations
|
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static const int kMaxNumPollForWork = 50; |
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|
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gpr_atm num_do_work_; // Number of calls to DoWork
|
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gpr_atm num_poll_for_work_; // Number of calls to PollForWork
|
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gpr_atm num_work_found_; // Number of times WORK_FOUND was returned
|
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}; |
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|
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void ThreadManagerTest::SleepForMs(int duration_ms) { |
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gpr_timespec sleep_time = |
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gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), |
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gpr_time_from_millis(duration_ms, GPR_TIMESPAN)); |
||||
gpr_sleep_until(sleep_time); |
||||
} |
||||
|
||||
grpc::ThreadManager::WorkStatus ThreadManagerTest::PollForWork(void **tag, |
||||
bool *ok) { |
||||
int call_num = gpr_atm_no_barrier_fetch_add(&num_poll_for_work_, 1); |
||||
|
||||
if (call_num >= kMaxNumPollForWork) { |
||||
Shutdown(); |
||||
return SHUTDOWN; |
||||
} |
||||
|
||||
// Simulate "polling for work" by sleeping for sometime
|
||||
SleepForMs(kPollingTimeoutMsec); |
||||
|
||||
*tag = nullptr; |
||||
*ok = true; |
||||
|
||||
// Return timeout roughly 1 out of every 3 calls
|
||||
if (call_num % 3 == 0) { |
||||
return TIMEOUT; |
||||
} else { |
||||
gpr_atm_no_barrier_fetch_add(&num_work_found_, 1); |
||||
return WORK_FOUND; |
||||
} |
||||
} |
||||
|
||||
void ThreadManagerTest::DoWork(void *tag, bool ok) { |
||||
gpr_atm_no_barrier_fetch_add(&num_do_work_, 1); |
||||
SleepForMs(kDoWorkDurationMsec); // Simulate doing work by sleeping
|
||||
} |
||||
|
||||
void ThreadManagerTest::PerformTest() { |
||||
// Initialize() starts the ThreadManager
|
||||
Initialize(); |
||||
|
||||
// Wait for all the threads to gracefully terminate
|
||||
Wait(); |
||||
|
||||
// The number of times DoWork() was called is equal to the number of times
|
||||
// WORK_FOUND was returned
|
||||
gpr_log(GPR_DEBUG, "DoWork() called %ld times", |
||||
gpr_atm_no_barrier_load(&num_do_work_)); |
||||
GPR_ASSERT(gpr_atm_no_barrier_load(&num_do_work_) == |
||||
gpr_atm_no_barrier_load(&num_work_found_)); |
||||
} |
||||
} // namespace grpc
|
||||
|
||||
int main(int argc, char **argv) { |
||||
std::srand(std::time(NULL)); |
||||
|
||||
grpc::testing::InitTest(&argc, &argv, true); |
||||
grpc::ThreadManagerTest test_rpc_manager; |
||||
test_rpc_manager.PerformTest(); |
||||
|
||||
return 0; |
||||
} |
||||
@ -0,0 +1,201 @@ |
||||
<?xml version="1.0" encoding="utf-8"?> |
||||
<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> |
||||
<Import Project="$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\grpc.dependencies.openssl.props" Condition="Exists('$(SolutionDir)\..\vsprojects\packages\grpc.dependencies.openssl.1.0.204.1\build\native\1.0.204.1.props')" /> |
||||
<ItemGroup Label="ProjectConfigurations"> |
||||
<ProjectConfiguration Include="Debug|Win32"> |
||||
<Configuration>Debug</Configuration> |
||||
<Platform>Win32</Platform> |
||||
</ProjectConfiguration> |
||||
<ProjectConfiguration Include="Debug|x64"> |
||||
<Configuration>Debug</Configuration> |
||||
<Platform>x64</Platform> |
||||
</ProjectConfiguration> |
||||
<ProjectConfiguration Include="Release|Win32"> |
||||
<Configuration>Release</Configuration> |
||||
<Platform>Win32</Platform> |
||||
</ProjectConfiguration> |
||||
<ProjectConfiguration Include="Release|x64"> |
||||
<Configuration>Release</Configuration> |
||||
<Platform>x64</Platform> |
||||
</ProjectConfiguration> |
||||
</ItemGroup> |
||||
<PropertyGroup Label="Globals"> |
||||
<ProjectGuid>{08C611E4-7F87-73BE-76CE-C158A4CC05A3}</ProjectGuid> |
||||
<IgnoreWarnIntDirInTempDetected>true</IgnoreWarnIntDirInTempDetected> |
||||
<IntDir>$(SolutionDir)IntDir\$(MSBuildProjectName)\</IntDir> |
||||
</PropertyGroup> |
||||
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" /> |
||||
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||||
Loading…
Reference in new issue