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
|
/**
* @file llmutex.cpp
*
* $LicenseInfo:firstyear=2004&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library 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;
* version 2.1 of the License only.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "llapr.h"
#include "apr_portable.h"
#include "llmutex.h"
#include "llthread.h"
//============================================================================
LLMutex::LLMutex(apr_pool_t *poolp) :
mAPRMutexp(NULL), mCount(0), mLockingThread(NO_THREAD)
{
//if (poolp)
//{
// mIsLocalPool = FALSE;
// mAPRPoolp = poolp;
//}
//else
{
mIsLocalPool = TRUE;
apr_pool_create(&mAPRPoolp, NULL); // Create a subpool for this thread
}
apr_thread_mutex_create(&mAPRMutexp, APR_THREAD_MUTEX_UNNESTED, mAPRPoolp);
}
LLMutex::~LLMutex()
{
#if MUTEX_DEBUG
//bad assertion, the subclass LLSignal might be "locked", and that's OK
//llassert_always(!isLocked()); // better not be locked!
#endif
if (ll_apr_is_initialized())
{
apr_thread_mutex_destroy(mAPRMutexp);
if (mIsLocalPool)
{
apr_pool_destroy(mAPRPoolp);
}
}
mAPRMutexp = NULL;
}
void LLMutex::lock()
{
if(isSelfLocked())
{ //redundant lock
mCount++;
return;
}
apr_thread_mutex_lock(mAPRMutexp);
#if MUTEX_DEBUG
// Have to have the lock before we can access the debug info
U32 id = LLThread::currentID();
if (mIsLocked[id] != FALSE)
LL_ERRS() << "Already locked in Thread: " << id << LL_ENDL;
mIsLocked[id] = TRUE;
#endif
mLockingThread = LLThread::currentID();
}
void LLMutex::unlock()
{
if (mCount > 0)
{ //not the root unlock
mCount--;
return;
}
#if MUTEX_DEBUG
// Access the debug info while we have the lock
U32 id = LLThread::currentID();
if (mIsLocked[id] != TRUE)
LL_ERRS() << "Not locked in Thread: " << id << LL_ENDL;
mIsLocked[id] = FALSE;
#endif
mLockingThread = NO_THREAD;
apr_thread_mutex_unlock(mAPRMutexp);
}
bool LLMutex::isLocked()
{
apr_status_t status = apr_thread_mutex_trylock(mAPRMutexp);
if (APR_STATUS_IS_EBUSY(status))
{
return true;
}
else
{
apr_thread_mutex_unlock(mAPRMutexp);
return false;
}
}
bool LLMutex::isSelfLocked()
{
return mLockingThread == LLThread::currentID();
}
U32 LLMutex::lockingThread() const
{
return mLockingThread;
}
//============================================================================
LLCondition::LLCondition(apr_pool_t *poolp) :
LLMutex(poolp)
{
// base class (LLMutex) has already ensured that mAPRPoolp is set up.
apr_thread_cond_create(&mAPRCondp, mAPRPoolp);
}
LLCondition::~LLCondition()
{
apr_thread_cond_destroy(mAPRCondp);
mAPRCondp = NULL;
}
void LLCondition::wait()
{
if (!isLocked())
{ //mAPRMutexp MUST be locked before calling apr_thread_cond_wait
apr_thread_mutex_lock(mAPRMutexp);
#if MUTEX_DEBUG
// avoid asserts on destruction in non-release builds
U32 id = LLThread::currentID();
mIsLocked[id] = TRUE;
#endif
}
apr_thread_cond_wait(mAPRCondp, mAPRMutexp);
}
void LLCondition::signal()
{
apr_thread_cond_signal(mAPRCondp);
}
void LLCondition::broadcast()
{
apr_thread_cond_broadcast(mAPRCondp);
}
//============================================================================
|
