/usr/include/tbb/critical_section.h is in libtbb-dev 2017~U7-8.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (c) 2005-2017 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.
*/
#ifndef _TBB_CRITICAL_SECTION_H_
#define _TBB_CRITICAL_SECTION_H_
#if _WIN32||_WIN64
#include "machine/windows_api.h"
#else
#include <pthread.h>
#include <errno.h>
#endif // _WIN32||WIN64
#include "tbb_stddef.h"
#include "tbb_thread.h"
#include "tbb_exception.h"
#include "tbb_profiling.h"
namespace tbb {
namespace internal {
class critical_section_v4 : internal::no_copy {
#if _WIN32||_WIN64
CRITICAL_SECTION my_impl;
#else
pthread_mutex_t my_impl;
#endif
tbb_thread::id my_tid;
public:
void __TBB_EXPORTED_METHOD internal_construct();
critical_section_v4() {
#if _WIN32||_WIN64
InitializeCriticalSectionEx( &my_impl, 4000, 0 );
#else
pthread_mutex_init(&my_impl, NULL);
#endif
internal_construct();
}
~critical_section_v4() {
__TBB_ASSERT(my_tid == tbb_thread::id(), "Destroying a still-held critical section");
#if _WIN32||_WIN64
DeleteCriticalSection(&my_impl);
#else
pthread_mutex_destroy(&my_impl);
#endif
}
class scoped_lock : internal::no_copy {
private:
critical_section_v4 &my_crit;
public:
scoped_lock( critical_section_v4& lock_me) :my_crit(lock_me) {
my_crit.lock();
}
~scoped_lock() {
my_crit.unlock();
}
};
void lock() {
tbb_thread::id local_tid = this_tbb_thread::get_id();
if(local_tid == my_tid) throw_exception( eid_improper_lock );
#if _WIN32||_WIN64
EnterCriticalSection( &my_impl );
#else
int rval = pthread_mutex_lock(&my_impl);
__TBB_ASSERT_EX(!rval, "critical_section::lock: pthread_mutex_lock failed");
#endif
__TBB_ASSERT(my_tid == tbb_thread::id(), NULL);
my_tid = local_tid;
}
bool try_lock() {
bool gotlock;
tbb_thread::id local_tid = this_tbb_thread::get_id();
if(local_tid == my_tid) return false;
#if _WIN32||_WIN64
gotlock = TryEnterCriticalSection( &my_impl ) != 0;
#else
int rval = pthread_mutex_trylock(&my_impl);
// valid returns are 0 (locked) and [EBUSY]
__TBB_ASSERT(rval == 0 || rval == EBUSY, "critical_section::trylock: pthread_mutex_trylock failed");
gotlock = rval == 0;
#endif
if(gotlock) {
my_tid = local_tid;
}
return gotlock;
}
void unlock() {
__TBB_ASSERT(this_tbb_thread::get_id() == my_tid, "thread unlocking critical_section is not thread that locked it");
my_tid = tbb_thread::id();
#if _WIN32||_WIN64
LeaveCriticalSection( &my_impl );
#else
int rval = pthread_mutex_unlock(&my_impl);
__TBB_ASSERT_EX(!rval, "critical_section::unlock: pthread_mutex_unlock failed");
#endif
}
static const bool is_rw_mutex = false;
static const bool is_recursive_mutex = false;
static const bool is_fair_mutex = true;
}; // critical_section_v4
} // namespace internal
typedef internal::critical_section_v4 critical_section;
__TBB_DEFINE_PROFILING_SET_NAME(critical_section)
} // namespace tbb
#endif // _TBB_CRITICAL_SECTION_H_
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