Intel(R) Threading Building Blocks Doxygen Documentation  version 4.2.3
spin_mutex.cpp
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1 /*
2  Copyright (c) 2005-2020 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 #include "tbb/tbb_machine.h"
18 #include "tbb/spin_mutex.h"
19 #include "itt_notify.h"
20 #include "tbb_misc.h"
21 
22 namespace tbb {
23 
25  __TBB_ASSERT( !my_mutex, "already holding a lock on a spin_mutex" );
26  ITT_NOTIFY(sync_prepare, &m);
28  my_mutex = &m;
29  ITT_NOTIFY(sync_acquired, &m);
30 }
31 
33  __TBB_ASSERT( my_mutex, "release on spin_mutex::scoped_lock that is not holding a lock" );
34 
35  ITT_NOTIFY(sync_releasing, my_mutex);
36  __TBB_UnlockByte(my_mutex->flag);
37  my_mutex = NULL;
38 }
39 
41  __TBB_ASSERT( !my_mutex, "already holding a lock on a spin_mutex" );
42  bool result = bool( __TBB_TryLockByte(m.flag) );
43  if( result ) {
44  my_mutex = &m;
45  ITT_NOTIFY(sync_acquired, &m);
46  }
47  return result;
48 }
49 
51  ITT_SYNC_CREATE(this, _T("tbb::spin_mutex"), _T(""));
52 }
53 
54 } // namespace tbb
#define __TBB_UnlockByte
Definition: gcc_generic.h:211
__TBB_Flag __TBB_LockByte(__TBB_atomic_flag &flag)
Definition: tbb_machine.h:919
bool __TBB_TryLockByte(__TBB_atomic_flag &flag)
Definition: tbb_machine.h:913
#define __TBB_ASSERT(predicate, comment)
No-op version of __TBB_ASSERT.
Definition: tbb_stddef.h:165
#define _T(string_literal)
Standard Windows style macro to markup the string literals.
Definition: itt_notify.h:59
#define ITT_SYNC_CREATE(obj, type, name)
Definition: itt_notify.h:115
#define ITT_NOTIFY(name, obj)
Definition: itt_notify.h:112
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
The graph class.
A lock that occupies a single byte.
Definition: spin_mutex.h:39
void __TBB_EXPORTED_METHOD internal_construct()
Internal constructor with ITT instrumentation.
Definition: spin_mutex.cpp:50
__TBB_atomic_flag flag
0 if lock is released, 1 if lock is acquired.
Definition: spin_mutex.h:41
spin_mutex * my_mutex
Points to currently held mutex, or NULL if no lock is held.
Definition: spin_mutex.h:56
void __TBB_EXPORTED_METHOD internal_acquire(spin_mutex &m)
Like acquire, but with ITT instrumentation.
Definition: spin_mutex.cpp:24
void __TBB_EXPORTED_METHOD internal_release()
Like release, but with ITT instrumentation.
Definition: spin_mutex.cpp:32
bool __TBB_EXPORTED_METHOD internal_try_acquire(spin_mutex &m)
Like try_acquire, but with ITT instrumentation.
Definition: spin_mutex.cpp:40

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