mirror of
https://github.com/zeromq/libzmq.git
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137 lines
4.3 KiB
C++
137 lines
4.3 KiB
C++
/*
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Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
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This file is part of libzmq, the ZeroMQ core engine in C++.
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libzmq is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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As a special exception, the Contributors give you permission to link
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this library with independent modules to produce an executable,
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regardless of the license terms of these independent modules, and to
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copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the
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terms and conditions of the license of that module. An independent
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module is a module which is not derived from or based on this library.
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If you modify this library, you must extend this exception to your
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version of the library.
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libzmq is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ZMQ_THREAD_HPP_INCLUDED__
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#define __ZMQ_THREAD_HPP_INCLUDED__
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#if defined ZMQ_HAVE_VXWORKS
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#include <vxWorks.h>
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#include <taskLib.h>
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#elif !defined ZMQ_HAVE_WINDOWS
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#include <pthread.h>
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#endif
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#include <set>
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#include <cstring>
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namespace zmq
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{
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typedef void (thread_fn) (void *);
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// Class encapsulating OS thread. Thread initiation/termination is done
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// using special functions rather than in constructor/destructor so that
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// thread isn't created during object construction by accident, causing
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// newly created thread to access half-initialised object. Same applies
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// to the destruction process: Thread should be terminated before object
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// destruction begins, otherwise it can access half-destructed object.
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class thread_t
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{
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public:
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thread_t () :
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_tfn (NULL),
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_arg (NULL),
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_started (false),
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_thread_priority (ZMQ_THREAD_PRIORITY_DFLT),
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_thread_sched_policy (ZMQ_THREAD_SCHED_POLICY_DFLT)
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{
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memset (_name, 0, sizeof (_name));
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}
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#ifdef ZMQ_HAVE_VXWORKS
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~thread_t ()
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{
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if (descriptor != NULL || descriptor > 0) {
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taskDelete (descriptor);
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}
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}
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#endif
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// Creates OS thread. 'tfn' is main thread function. It'll be passed
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// 'arg' as an argument.
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// Name is 16 characters max including terminating NUL. Thread naming is
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// implemented only for pthread, and windows when a debugger is attached.
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void start (thread_fn *tfn_, void *arg_, const char *name_);
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// Returns whether the thread was started, i.e. start was called.
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bool get_started () const;
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// Returns whether the executing thread is the thread represented by the
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// thread object.
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bool is_current_thread () const;
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// Waits for thread termination.
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void stop ();
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// Sets the thread scheduling parameters. Only implemented for
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// pthread. Has no effect on other platforms.
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void setSchedulingParameters (int priority_,
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int scheduling_policy_,
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const std::set<int> &affinity_cpus_);
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// These are internal members. They should be private, however then
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// they would not be accessible from the main C routine of the thread.
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void applySchedulingParameters ();
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void applyThreadName ();
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thread_fn *_tfn;
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void *_arg;
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char _name[16];
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private:
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bool _started;
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#ifdef ZMQ_HAVE_WINDOWS
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HANDLE _descriptor;
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#if defined _WIN32_WCE
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DWORD _thread_id;
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#else
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unsigned int _thread_id;
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#endif
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#elif defined ZMQ_HAVE_VXWORKS
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int _descriptor;
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enum
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{
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DEFAULT_PRIORITY = 100,
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DEFAULT_OPTIONS = 0,
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DEFAULT_STACK_SIZE = 4000
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};
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#else
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pthread_t _descriptor;
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#endif
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// Thread scheduling parameters.
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int _thread_priority;
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int _thread_sched_policy;
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std::set<int> _thread_affinity_cpus;
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ZMQ_NON_COPYABLE_NOR_MOVABLE (thread_t)
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};
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}
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#endif
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