Intel(R) Threading Building Blocks Doxygen Documentation  version 4.2.3
spin_mutex.cpp
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1 /*
2  Copyright (c) 2005-2019 Intel Corporation
3 
4  Licensed under the Apache License, Version 2.0 (the "License");
5  you may not use this file except in compliance with the License.
6  You may obtain a copy of the License at
7 
8  http://www.apache.org/licenses/LICENSE-2.0
9 
10  Unless required by applicable law or agreed to in writing, software
11  distributed under the License is distributed on an "AS IS" BASIS,
12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  See the License for the specific language governing permissions and
14  limitations under the License.
15 
16 
17 
18 
19 */
20 
21 #include "tbb/tbb_machine.h"
22 #include "tbb/spin_mutex.h"
23 #include "itt_notify.h"
24 #include "tbb_misc.h"
25 
26 namespace tbb {
27 
29  __TBB_ASSERT( !my_mutex, "already holding a lock on a spin_mutex" );
30  ITT_NOTIFY(sync_prepare, &m);
32  my_mutex = &m;
33  ITT_NOTIFY(sync_acquired, &m);
34 }
35 
37  __TBB_ASSERT( my_mutex, "release on spin_mutex::scoped_lock that is not holding a lock" );
38 
39  ITT_NOTIFY(sync_releasing, my_mutex);
40  __TBB_UnlockByte(my_mutex->flag);
41  my_mutex = NULL;
42 }
43 
45  __TBB_ASSERT( !my_mutex, "already holding a lock on a spin_mutex" );
46  bool result = bool( __TBB_TryLockByte(m.flag) );
47  if( result ) {
48  my_mutex = &m;
49  ITT_NOTIFY(sync_acquired, &m);
50  }
51  return result;
52 }
53 
55  ITT_SYNC_CREATE(this, _T("tbb::spin_mutex"), _T(""));
56 }
57 
58 } // namespace tbb
#define __TBB_UnlockByte
Definition: gcc_generic.h:215
void __TBB_EXPORTED_METHOD internal_acquire(spin_mutex &m)
Like acquire, but with ITT instrumentation.
Definition: spin_mutex.cpp:28
bool __TBB_TryLockByte(__TBB_atomic_flag &flag)
Definition: tbb_machine.h:917
spin_mutex * my_mutex
Points to currently held mutex, or NULL if no lock is held.
Definition: spin_mutex.h:57
#define __TBB_ASSERT(predicate, comment)
No-op version of __TBB_ASSERT.
Definition: tbb_stddef.h:169
#define ITT_SYNC_CREATE(obj, type, name)
Definition: itt_notify.h:123
A lock that occupies a single byte.
Definition: spin_mutex.h:40
The graph class.
#define _T(string_literal)
Standard Windows style macro to markup the string literals.
Definition: itt_notify.h:66
void __TBB_EXPORTED_METHOD internal_construct()
Internal constructor with ITT instrumentation.
Definition: spin_mutex.cpp:54
void const char const char int ITT_FORMAT __itt_group_sync x void const char ITT_FORMAT __itt_group_sync s void ITT_FORMAT __itt_group_sync p void ITT_FORMAT p sync_releasing
void __TBB_EXPORTED_METHOD internal_release()
Like release, but with ITT instrumentation.
Definition: spin_mutex.cpp:36
#define ITT_NOTIFY(name, obj)
Definition: itt_notify.h:120
bool __TBB_EXPORTED_METHOD internal_try_acquire(spin_mutex &m)
Like try_acquire, but with ITT instrumentation.
Definition: spin_mutex.cpp:44
__TBB_Flag __TBB_LockByte(__TBB_atomic_flag &flag)
Definition: tbb_machine.h:923
__TBB_atomic_flag flag
0 if lock is released, 1 if lock is acquired.
Definition: spin_mutex.h:42

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