134 lines
4.4 KiB
C
134 lines
4.4 KiB
C
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/*
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Copyright 2005-2016 Intel Corporation. All Rights Reserved.
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This file is part of Threading Building Blocks. Threading Building Blocks is free software;
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you can redistribute it and/or modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation. Threading Building Blocks is
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distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details. You should have received a copy of
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the GNU General Public License along with Threading Building Blocks; if not, write to the
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Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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As a special exception, you may use this file as part of a free software library without
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restriction. Specifically, if other files instantiate templates or use macros or inline
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functions from this file, or you compile this file and link it with other files to produce
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an executable, this file does not by itself cause the resulting executable to be covered
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by the GNU General Public License. This exception does not however invalidate any other
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reasons why the executable file might be covered by the GNU General Public License.
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*/
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#ifndef _TBB_CRITICAL_SECTION_H_
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#define _TBB_CRITICAL_SECTION_H_
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#if _WIN32||_WIN64
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#include "machine/windows_api.h"
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#else
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#include <pthread.h>
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#include <errno.h>
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#endif // _WIN32||WIN64
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#include "tbb_stddef.h"
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#include "tbb_thread.h"
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#include "tbb_exception.h"
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#include "tbb_profiling.h"
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namespace tbb {
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namespace internal {
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class critical_section_v4 : internal::no_copy {
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#if _WIN32||_WIN64
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CRITICAL_SECTION my_impl;
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#else
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pthread_mutex_t my_impl;
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#endif
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tbb_thread::id my_tid;
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public:
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void __TBB_EXPORTED_METHOD internal_construct();
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critical_section_v4() {
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#if _WIN32||_WIN64
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InitializeCriticalSectionEx( &my_impl, 4000, 0 );
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#else
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pthread_mutex_init(&my_impl, NULL);
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#endif
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internal_construct();
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}
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~critical_section_v4() {
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__TBB_ASSERT(my_tid == tbb_thread::id(), "Destroying a still-held critical section");
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#if _WIN32||_WIN64
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DeleteCriticalSection(&my_impl);
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#else
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pthread_mutex_destroy(&my_impl);
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#endif
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}
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class scoped_lock : internal::no_copy {
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private:
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critical_section_v4 &my_crit;
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public:
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scoped_lock( critical_section_v4& lock_me) :my_crit(lock_me) {
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my_crit.lock();
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}
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~scoped_lock() {
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my_crit.unlock();
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}
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};
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void lock() {
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tbb_thread::id local_tid = this_tbb_thread::get_id();
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if(local_tid == my_tid) throw_exception( eid_improper_lock );
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#if _WIN32||_WIN64
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EnterCriticalSection( &my_impl );
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#else
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int rval = pthread_mutex_lock(&my_impl);
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__TBB_ASSERT_EX(!rval, "critical_section::lock: pthread_mutex_lock failed");
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#endif
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__TBB_ASSERT(my_tid == tbb_thread::id(), NULL);
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my_tid = local_tid;
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}
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bool try_lock() {
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bool gotlock;
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tbb_thread::id local_tid = this_tbb_thread::get_id();
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if(local_tid == my_tid) return false;
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#if _WIN32||_WIN64
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gotlock = TryEnterCriticalSection( &my_impl ) != 0;
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#else
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int rval = pthread_mutex_trylock(&my_impl);
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// valid returns are 0 (locked) and [EBUSY]
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__TBB_ASSERT(rval == 0 || rval == EBUSY, "critical_section::trylock: pthread_mutex_trylock failed");
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gotlock = rval == 0;
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#endif
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if(gotlock) {
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my_tid = local_tid;
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}
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return gotlock;
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}
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void unlock() {
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__TBB_ASSERT(this_tbb_thread::get_id() == my_tid, "thread unlocking critical_section is not thread that locked it");
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my_tid = tbb_thread::id();
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#if _WIN32||_WIN64
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LeaveCriticalSection( &my_impl );
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#else
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int rval = pthread_mutex_unlock(&my_impl);
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__TBB_ASSERT_EX(!rval, "critical_section::unlock: pthread_mutex_unlock failed");
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#endif
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}
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static const bool is_rw_mutex = false;
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static const bool is_recursive_mutex = false;
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static const bool is_fair_mutex = true;
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}; // critical_section_v4
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} // namespace internal
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typedef internal::critical_section_v4 critical_section;
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__TBB_DEFINE_PROFILING_SET_NAME(critical_section)
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} // namespace tbb
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#endif // _TBB_CRITICAL_SECTION_H_
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