/usr/include/tbb/critical_section.h is in libtbb-dev 4.4~20151115-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /*
Copyright 2005-2015 Intel Corporation. All Rights Reserved.
This file is part of Threading Building Blocks. Threading Building Blocks is free software;
you can redistribute it and/or modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation. Threading Building Blocks 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 General Public License for more details. You should have received a copy of
the GNU General Public License along with Threading Building Blocks; if not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
As a special exception, you may use this file as part of a free software library without
restriction. Specifically, if other files instantiate templates or use macros or inline
functions from this file, or you compile this file and link it with other files to produce
an executable, this file does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however invalidate any other
reasons why the executable file might be covered by the GNU General Public 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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