1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/*
Minetest
Copyright (C) 2013 sapier, <sapier AT gmx DOT net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef C_ASYNC_EVENTS_H_
#define C_ASYNC_EVENTS_H_
#include <vector>
#include <map>
#ifndef _MSC_VER
#include <unistd.h>
#else
#define _WINSOCKAPI_
#include <windows.h>
static unsigned sleep(unsigned seconds) {
Sleep(seconds * 1000);
return 0;
}
#endif
/******************************************************************************/
/* Includes */
/******************************************************************************/
#include "jthread/jthread.h"
#include "jthread/jmutex.h"
#include "jthread/jsemaphore.h"
#include "debug.h"
#include "lua.h"
/******************************************************************************/
/* Typedefs and macros */
/******************************************************************************/
#define MAINMENU_NUMBER_OF_ASYNC_THREADS 4
/******************************************************************************/
/* forward declarations */
/******************************************************************************/
class AsyncEngine;
/******************************************************************************/
/* declarations */
/******************************************************************************/
/** a struct to encapsulate data required to queue a job **/
struct LuaJobInfo {
/** function to be called in async environment **/
std::string serializedFunction;
/** parameter table to be passed to function **/
std::string serializedParams;
/** result of function call **/
std::string serializedResult;
/** jobid used to identify a job and match it to callback **/
unsigned int JobId;
/** valid marker **/
bool valid;
};
/** class encapsulating a asynchronous working environment **/
class AsyncWorkerThread : public JThread {
public:
/**
* default constructor
* @param pointer to job dispatcher
*/
AsyncWorkerThread(AsyncEngine* jobdispatcher, unsigned int threadnumber);
/**
* default destructor
*/
virtual ~AsyncWorkerThread();
/**
* thread function
*/
void* Thread() {
ThreadStarted();
return worker_thread_wrapper(this);
}
/**
* wait for thread to stop
*/
void Wait() {
while(IsRunning()) {
sleep(1);
}
}
private:
/**
* helper function to run a lua script
* @param path of script
*/
bool runScript(std::string script);
/**
* main function of thread
*/
void* worker_thread_main();
/**
* static wrapper for thread creation
* @param this pointer to the thread to be created
*/
static void* worker_thread_wrapper(void* thread);
/**
* pointer to job dispatcher
*/
AsyncEngine* m_JobDispatcher;
/**
* the lua stack to run at
*/
lua_State* m_LuaStack;
/**
* lua internal stack number of error handler
*/
int m_luaerrorhandler;
/**
* thread number used for debug output
*/
unsigned int m_threadnum;
};
/** asynchornous thread and job management **/
class AsyncEngine {
friend class AsyncWorkerThread;
public:
/**
* default constructor
*/
AsyncEngine();
/**
* default destructor
*/
~AsyncEngine();
/**
* register function to be used within engines
* @param name function name to be used within lua environment
* @param fct c-function to be called
*/
bool registerFunction(const char* name, lua_CFunction fct);
/**
* create async engine tasks and lock function registration
* @param numengines number of async threads to be started
*/
void Initialize(unsigned int numengines);
/**
* queue/run a async job
* @param fct serialized lua function
* @param params serialized parameters
* @return jobid the job is queued
*/
unsigned int doAsyncJob(std::string fct, std::string params);
/**
* engine step to process finished jobs
* the engine step is one way to pass events back, PushFinishedJobs another
* @param L the lua environment to do the step in
*/
void Step(lua_State *L);
void PushFinishedJobs(lua_State* L);
protected:
/**
* Get a Job from queue to be processed
* this function blocks until a job is ready
* @return a job to be processed
*/
LuaJobInfo getJob();
/**
* put a Job result back to result queue
* @param result result of completed job
*/
void putJobResult(LuaJobInfo result);
/**
* initialize environment with current registred functions
* this function adds all functions registred by registerFunction to the
* passed lua stack
* @param L lua stack to initialize
* @param top stack position
*/
void PrepareEnvironment(lua_State* L, int top);
private:
/** variable locking the engine against further modification **/
bool m_initDone;
/** internal store for registred functions **/
std::map<std::string,lua_CFunction> m_FunctionList;
/** internal counter to create job id's **/
unsigned int m_JobIdCounter;
/** mutex to protect job queue **/
JMutex m_JobQueueMutex;
/** job queue **/
std::vector<LuaJobInfo> m_JobQueue;
/** mutext to protect result queue **/
JMutex m_ResultQueueMutex;
/** result queue **/
std::vector<LuaJobInfo> m_ResultQueue;
/** list of current worker threads **/
std::vector<AsyncWorkerThread*> m_WorkerThreads;
/** counter semaphore for job dispatching **/
JSemaphore m_JobQueueCounter;
};
#endif /* C_ASYNC_EVENTS_H_ */
|
