spin_mutex.cpp
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/*
Copyright (c) 2005-2020 Intel Corporation
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "tbb/tbb_machine.h"
#include "tbb/spin_mutex.h"
#include "itt_notify.h"
#include "tbb_misc.h"
namespace tbb {
void spin_mutex::scoped_lock::internal_acquire( spin_mutex& m ) {
__TBB_ASSERT( !my_mutex, "already holding a lock on a spin_mutex" );
ITT_NOTIFY(sync_prepare, &m);
__TBB_LockByte(m.flag);
my_mutex = &m;
ITT_NOTIFY(sync_acquired, &m);
}
void spin_mutex::scoped_lock::internal_release() {
__TBB_ASSERT( my_mutex, "release on spin_mutex::scoped_lock that is not holding a lock" );
ITT_NOTIFY(sync_releasing, my_mutex);
__TBB_UnlockByte(my_mutex->flag);
my_mutex = NULL;
}
bool spin_mutex::scoped_lock::internal_try_acquire( spin_mutex& m ) {
__TBB_ASSERT( !my_mutex, "already holding a lock on a spin_mutex" );
bool result = bool( __TBB_TryLockByte(m.flag) );
if( result ) {
my_mutex = &m;
ITT_NOTIFY(sync_acquired, &m);
}
return result;
}
void spin_mutex::internal_construct() {
ITT_SYNC_CREATE(this, _T("tbb::spin_mutex"), _T(""));
}
} // namespace tbb
tbb::spin_mutex
A lock that occupies a single byte.
Definition: spin_mutex.h:39
spin_mutex.h
__TBB_ASSERT
#define __TBB_ASSERT(predicate, comment)
No-op version of __TBB_ASSERT.
Definition: tbb_stddef.h:165
ITT_NOTIFY
#define ITT_NOTIFY(name, obj)
Definition: itt_notify.h:112
__TBB_LockByte
__TBB_Flag __TBB_LockByte(__TBB_atomic_flag &flag)
Definition: tbb_machine.h:922
tbb
The graph class.
Definition: serial/tbb/parallel_for.h:46
tbb::spin_mutex::scoped_lock::internal_try_acquire
bool __TBB_EXPORTED_METHOD internal_try_acquire(spin_mutex &m)
Like try_acquire, but with ITT instrumentation.
Definition: spin_mutex.cpp:40
itt_notify.h
__TBB_TryLockByte
bool __TBB_TryLockByte(__TBB_atomic_flag &flag)
Definition: tbb_machine.h:916
tbb::spin_mutex::scoped_lock::internal_acquire
void __TBB_EXPORTED_METHOD internal_acquire(spin_mutex &m)
Like acquire, but with ITT instrumentation.
Definition: spin_mutex.cpp:24
ITT_SYNC_CREATE
#define ITT_SYNC_CREATE(obj, type, name)
Definition: itt_notify.h:115
__TBB_UnlockByte
#define __TBB_UnlockByte
Definition: gcc_generic.h:211
_T
#define _T(string_literal)
Standard Windows style macro to markup the string literals.
Definition: itt_notify.h:59
tbb_misc.h
tbb_machine.h
tbb::spin_mutex::internal_construct
void __TBB_EXPORTED_METHOD internal_construct()
Internal constructor with ITT instrumentation.
Definition: spin_mutex.cpp:50
sync_releasing
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
Definition: ittnotify_static.h:104
tbb::spin_mutex::scoped_lock::internal_release
void __TBB_EXPORTED_METHOD internal_release()
Like release, but with ITT instrumentation.
Definition: spin_mutex.cpp:32
tbb::spin_mutex::flag
__TBB_atomic_flag flag
0 if lock is released, 1 if lock is acquired.
Definition: spin_mutex.h:41
tbb::spin_mutex::scoped_lock::my_mutex
spin_mutex * my_mutex
Points to currently held mutex, or NULL if no lock is held.
Definition: spin_mutex.h:56

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