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//-----------------------------------------------------------------------------
// Name: processpool.h
// Developer: Wolfire Games LLC
// Description:
// License: Read below
//-----------------------------------------------------------------------------
//
// Copyright 2022 Wolfire Games LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//-----------------------------------------------------------------------------
#pragma once
#include <Utility/disallow_copy_and_assign.h>
#include <string>
#include <vector>
#include <queue>
#include <map>
using std::string;
using std::map;
using std::vector;
using std::queue;
#ifdef _WIN32
#define NOMINMAX
#include <windows.h>
class OSProcess {
public:
OSProcess(const string &worker_path);
~OSProcess();
string WaitForChildMessage();
void SendMessageToChild(const string &msg);
private:
HANDLE read_pipe_;
HANDLE write_pipe_;
PROCESS_INFORMATION process_info_;
DISALLOW_COPY_AND_ASSIGN(OSProcess);
};
#else
#include <pthread.h>
#include <unistd.h>
class OSProcess {
public:
OSProcess(const string &worker_path);
~OSProcess();
string WaitForChildMessage();
void SendMessageToChild(const string &msg);
private:
int read_pipe_;
int write_pipe_;
int process_info_;
DISALLOW_COPY_AND_ASSIGN(OSProcess);
};
#endif //_WIN32
class ProcessPool;
class ProcessHandle {
public:
void Process(const string& task);
inline bool idle(){return idle_;}
void ProcessInBackground();
ProcessHandle(const string &worker_path, ProcessPool* parent_process_pool);
private:
bool idle_;
OSProcess os_process_;
ProcessPool* parent_process_pool_;
bool ProcessMessageFromChild(const string& msg);
DISALLOW_COPY_AND_ASSIGN(ProcessHandle);
};
class ProcessPool {
public:
// Change number of process handlers
void Resize(int _size);
typedef int (*JobFunctionPtr)(int argc, const char* argv[]);
typedef map<string, ProcessPool::JobFunctionPtr> JobMap;
enum Error{SUCCESS = 0,
NO_IDLE_PROCESS = -1,
NO_TASK_IN_QUEUE = -2};
static bool AmIAWorkerProcess( int argc, char* argv[] );
static int WorkerProcessMain(const JobMap &job_map);
void NotifyTaskComplete();
void Schedule(const string& task);
void WaitForTasksToComplete();
void ClearQueuedTasks();
int NumProcesses();
ProcessPool(const string &worker_path, int size=0);
~ProcessPool();
private:
// Attempts to start processing the first task in the queue in the first
// idle process. Can return SUCCESS, NO_IDLE_PROCESS or NO_TASK_IN_QUEUE.
ProcessPool::Error ProcessFirstTaskInQueue();
// Returns index of the first idle process in pool, or -1 if there
// are no idle processes
int GetIdleProcessIndex();
string worker_path_;
vector<ProcessHandle*> processes_;
queue<string> tasks_;
#ifdef _WIN32
HANDLE mutex_;
HANDLE idle_event_;
#else
pthread_mutex_t mutex_;
pthread_mutex_t idle_event_mutex_;
pthread_cond_t idle_event_cond_;
bool idle_event_bool_;
#endif
DISALLOW_COPY_AND_ASSIGN(ProcessPool);
};
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