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Wait for all tasks completed in thread pool

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PiperOrigin-RevId: 542866176
This commit is contained in:
Guogang Li
2023-06-23 08:30:37 -07:00
committed by Copybara-Service
parent 1e43f4d83e
commit 72af220dae
3 changed files with 90 additions and 22 deletions
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internal/platform/implementation/windows/thread_pool.cc
+66 -16
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@@ -21,6 +21,7 @@
#include "absl/memory/memory.h"
#include "absl/synchronization/mutex.h"
#include "internal/platform/count_down_latch.h"
#include "internal/platform/logging.h"
#include "internal/platform/runnable.h"
@@ -38,9 +39,6 @@ VOID CALLBACK WorkCallback(PTP_CALLBACK_INSTANCE instance, PVOID parameter,
}
std::unique_ptr<ThreadPool> ThreadPool::Create(int max_pool_size) {
NEARBY_LOGS(VERBOSE) << __func__ << ": Create thread pool with maximum size("
<< max_pool_size << ").";
PTP_POOL thread_pool = nullptr;
TP_CALLBACK_ENVIRON thread_pool_environ;
InitializeThreadpoolEnvironment(&thread_pool_environ);
@@ -93,6 +91,10 @@ ThreadPool::~ThreadPool() {
NEARBY_LOGS(VERBOSE) << __func__ << ": Thread pool(" << this
<< ") is released.";
if (thread_pool_ == nullptr) {
return;
}
ShutDown();
}
@@ -103,6 +105,11 @@ bool ThreadPool::Run(Runnable task) {
return false;
}
if (shutdown_latch_ != nullptr) {
NEARBY_LOGS(WARNING) << __func__ << ": Thread pool is in shutting down.";
return false;
}
PTP_WORK work;
tasks_.push(std::move(task));
NEARBY_LOGS(VERBOSE) << __func__ << ": Scheduled to run task("
@@ -116,6 +123,8 @@ bool ThreadPool::Run(Runnable task) {
return false;
}
++running_tasks_count_;
//
// Submit the work to the pool. Because this was a pre-allocated
// work item (using CreateThreadpoolWork), it is guaranteed to execute.
@@ -125,17 +134,45 @@ bool ThreadPool::Run(Runnable task) {
}
void ThreadPool::ShutDown() {
absl::MutexLock lock(&mutex_);
{
absl::MutexLock lock(&mutex_);
NEARBY_LOGS(VERBOSE) << __func__ << ": Shutdown thread pool(" << this << ").";
if (thread_pool_ == nullptr) {
NEARBY_LOGS(WARNING) << __func__ << ": Shutdown on closed thread pool("
<< this << ").";
return;
if (thread_pool_ == nullptr) {
NEARBY_LOGS(WARNING) << __func__ << ": Shutdown on closed thread pool("
<< this << ").";
return;
}
if (running_tasks_count_ == 0) {
CloseThreadpool(thread_pool_);
thread_pool_ = nullptr;
NEARBY_LOGS(VERBOSE) << __func__ << ": Thread pool(" << this
<< ") is shut down.";
return;
}
if (shutdown_latch_ != nullptr) {
NEARBY_LOGS(VERBOSE) << __func__ << ": Thread pool(" << this
<< ") is already in shutting down.";
return;
}
NEARBY_LOGS(VERBOSE) << __func__ << ": Thread pool(" << this
<< ") is shutting down.";
shutdown_latch_ = std::make_unique<CountDownLatch>(1);
}
CloseThreadpool(thread_pool_);
thread_pool_ = nullptr;
// Wait for all tasks to complete.
shutdown_latch_->Await();
{
absl::MutexLock lock(&mutex_);
CloseThreadpool(thread_pool_);
thread_pool_ = nullptr;
NEARBY_LOGS(VERBOSE) << __func__ << ": Thread pool(" << this
<< ") is shut down.";
}
}
void ThreadPool::RunNextTask() {
@@ -153,15 +190,28 @@ void ThreadPool::RunNextTask() {
task = std::move(tasks_.front());
tasks_.pop();
if (task == nullptr) {
NEARBY_LOGS(WARNING)
<< __func__ << ": Tried to run task in an empty thread pool.";
--running_tasks_count_;
if (running_tasks_count_ == 0 && shutdown_latch_ != nullptr) {
shutdown_latch_->CountDown();
}
return;
}
}
}
if (task == nullptr) {
NEARBY_LOGS(WARNING) << __func__
<< ": Tried to run task in an empty thread pool.";
return;
}
task();
{
absl::MutexLock lock(&mutex_);
--running_tasks_count_;
if (running_tasks_count_ == 0 && shutdown_latch_ != nullptr) {
shutdown_latch_->CountDown();
}
}
}
} // namespace windows