File: LuaUser.cpp

package info (click to toggle)
spring 98.0%2Bdfsg-1
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 41,928 kB
  • ctags: 60,665
  • sloc: cpp: 356,167; ansic: 39,434; python: 12,228; java: 12,203; awk: 5,856; sh: 1,719; xml: 997; perl: 405; php: 253; objc: 194; makefile: 72; sed: 2
file content (195 lines) | stat: -rw-r--r-- 4,535 bytes parent folder | download
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
/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */

#include <map>
#include <boost/thread/recursive_mutex.hpp>
#include <boost/thread.hpp>

#include "LuaInclude.h"
#include "Lua/LuaHandle.h"
#include "System/Platform/Threading.h"
#include "System/Log/ILog.h"
#if (!defined(DEDICATED) && !defined(UNITSYNC) && !defined(BUILDING_AI))
	#include "System/Misc/SpringTime.h"
#endif


///////////////////////////////////////////////////////////////////////////
// Custom Lua Mutexes

static std::map<lua_State*, boost::recursive_mutex*> mutexes;
static std::map<lua_State*, bool> coroutines;

static boost::recursive_mutex* GetLuaMutex(lua_State* L)
{
	assert(!mutexes[L]);
	return new boost::recursive_mutex();
}



void LuaCreateMutex(lua_State* L)
{
	luaContextData* lcd = GetLuaContextData(L);
	if (!lcd) return; // CLuaParser
	assert(lcd);

	boost::recursive_mutex* mutex = GetLuaMutex(L);
	lcd->luamutex = mutex;
	mutexes[L] = mutex;
}


void LuaDestroyMutex(lua_State* L)
{
	if (!GetLuaContextData(L)) return; // CLuaParser
	assert(GetLuaContextData(L));

	if (coroutines.find(L) != coroutines.end()) {
		mutexes.erase(L);
		coroutines.erase(L);
	} else {
		lua_unlock(L);
		assert(mutexes.find(L) != mutexes.end());
		boost::recursive_mutex* mutex = GetLuaContextData(L)->luamutex;
		assert(mutex);
		delete mutex;
		mutexes.erase(L);
		//TODO erase all related coroutines too?
	}
}


void LuaLinkMutex(lua_State* L_parent, lua_State* L_child)
{
	luaContextData* plcd = GetLuaContextData(L_parent);
	assert(plcd);

	luaContextData* clcd = GetLuaContextData(L_child);
	assert(clcd);

	assert(plcd == clcd);

	coroutines[L_child] = true;
	mutexes[L_child] = plcd->luamutex;
}


void LuaMutexLock(lua_State* L)
{
	if (!GetLuaContextData(L)) return; // CLuaParser

	boost::recursive_mutex* mutex = GetLuaContextData(L)->luamutex;

	if (mutex->try_lock())
		return;

	//static int failedLocks = 0;
	//LOG("LuaMutexLock %i", ++failedLocks);
	mutex->lock();
}


void LuaMutexUnlock(lua_State* L)
{
	if (!GetLuaContextData(L)) return; // CLuaParser

	boost::recursive_mutex* mutex = GetLuaContextData(L)->luamutex;
	mutex->unlock();
}


void LuaMutexYield(lua_State* L)
{
	assert(GetLuaContextData(L));
	/*mutexes[L]->unlock();
	if (!mutexes[L]->try_lock()) {
		// only yield if another thread is waiting for the mutex
		boost::this_thread::yield();
		mutexes[L]->lock();
	}*/

	static int count = 0;
	bool y = false;
	if (count-- <= 0) { y = true; count = 30; }
	LuaMutexUnlock(L);

	if (y) boost::this_thread::yield();
	LuaMutexLock(L);
}


///////////////////////////////////////////////////////////////////////////
//

const char* spring_lua_getName(lua_State* L)
{
	auto ld = GetLuaContextData(L);
	if (ld) {
		return ld->owner->GetName().c_str();
	}

	static const char* c = "";
	return c;
}


///////////////////////////////////////////////////////////////////////////
// Custom Memory Allocator
//
// these track allocations across all states
static Threading::AtomicCounterInt64 totalBytesAlloced = 0;
static Threading::AtomicCounterInt64 totalNumLuaAllocs = 0;
static Threading::AtomicCounterInt64 totalLuaAllocTime = 0;

static const unsigned int maxAllocedBytes = 768u * 1024u*1024u;
static const char* maxAllocFmtStr = "%s: cannot allocate more memory! (%u bytes already used, %u bytes maximum)";


void* spring_lua_alloc(void* ud, void* ptr, size_t osize, size_t nsize)
{
	auto lcd = (luaContextData*) ud;

	if (nsize == 0) {
		totalBytesAlloced -= osize;
		free(ptr);
		return NULL;
	}

	if ((nsize > osize) && (totalBytesAlloced > maxAllocedBytes)) {
		// better kill Lua than whole engine
		// NOTE: this will trigger luaD_throw --> exit(EXIT_FAILURE)
		LOG_L(L_FATAL, maxAllocFmtStr, (lcd->owner->GetName()).c_str(), totalBytesAlloced, maxAllocedBytes);
		return NULL;
	}

	#if (!defined(DEDICATED) && !defined(UNITSYNC) && !defined(BUILDING_AI))
	const spring_time t0 = spring_gettime();
	void* mem = realloc(ptr, nsize);
	const spring_time t1 = spring_gettime();

	totalBytesAlloced += (nsize - osize);
	totalNumLuaAllocs += 1;
	totalLuaAllocTime += (t1 - t0).toMicroSecsi();

	return mem;
	#else
	return (realloc(ptr, nsize));
	#endif
}

void spring_lua_alloc_get_stats(SLuaInfo* info)
{
	info->allocedBytes = totalBytesAlloced;
	info->numLuaAllocs = totalNumLuaAllocs;
	info->luaAllocTime = totalLuaAllocTime;
	info->numLuaStates = mutexes.size() - coroutines.size();
}

void spring_lua_alloc_update_stats(bool clear)
{
	if (clear) {
		totalNumLuaAllocs = 0;
		totalLuaAllocTime = 0;
	}
}