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// file : cult/sched/thread.cxx
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2005-2010 Boris Kolpackov
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
#include <cult/sched/thread.hxx>
#include <cult/sched/lock.hxx>
#include <cult/sched/exception.hxx>
#include <cult/mm/counter.hxx> // MM::inc_ref
#include <cult/trace/stream.hxx>
namespace Cult
{
namespace Sched
{
namespace
{
Trace::Stream tout ("Cult::Sched::Thread", 7);
}
namespace Bits
{
typedef Void* (*Routine) (Void*);
struct StartData
{
StartData (Shptr<Thread> const& thread, Routine routine, void* arg)
: thread_ (thread), routine_ (routine), arg_ (arg)
{
}
~StartData ()
{
tout << 8 << "start data is being destroyed.";
}
Shptr<Thread> thread_;
Routine routine_;
Void* arg_;
};
static pthread_key_t key;
static pthread_once_t key_once = PTHREAD_ONCE_INIT;
extern "C" Void
cult_thread_dtor (Void* p)
{
// Exception in this function will result in the call
// to std::terminate().
//
tout << "cult_thread_dtor is being executed.";
Shptr<Thread> self (reinterpret_cast<Thread*> (p));
}
extern "C" Void
cult_thread_make_key ()
{
if (Int e = pthread_key_create (&key, &cult_thread_dtor))
throw Implementation (e);
}
extern "C" Void*
cult_thread_trampoline (Void* arg)
{
// Any failure in this function will result in the call
// to std::terminate().
//
Routine routine;
{
Shptr<StartData> data (reinterpret_cast<StartData*> (arg));
Thread* p (data->thread_.get ());
if (Int e = pthread_setspecific (key, p))
throw Implementation (e);
else
MM::inc_ref (p);
routine = data->routine_;
arg = data->arg_;
}
return routine (arg);
}
}
Thread::
Thread (Void* (*routine) (Void*), Void* arg)
: detached_ (false)
{
using Bits::StartData;
tout << "thread is being constructed.";
pthread_once (&Bits::key_once, &Bits::cult_thread_make_key);
Shptr<Thread> self (MM::inc_ref (this));
Shptr<StartData> data (new StartData (self, routine, arg));
if (Int e = pthread_create (&id_,
0,
&Bits::cult_thread_trampoline,
data.get ()))
{
throw Implementation (e);
}
else
{
// If pthread_create did not fail then thread_trampoline
// will release the data.
//
data.release ();
}
}
Thread::
Thread ()
: id_ (pthread_self ()), detached_ (false) //@@ We can't be sure
// the it is detached.
{
tout << "thread is being adopted.";
pthread_once (&Bits::key_once, &Bits::cult_thread_make_key);
if (pthread_getspecific (Bits::key) != 0)
throw Adopted ();
Shptr<Thread> self (MM::inc_ref (this));
if(Int e = pthread_setspecific (Bits::key, this))
{
throw Implementation (e);
}
else
{
// TSD slot has the reference now.
//
self.release ();
}
}
Void* Thread::
join ()
{
Lock lock (mutex_);
if (detached_)
throw Joined ();
Void* r;
if (Int e = pthread_join (id_, &r))
throw Implementation (e);
detached_ = true;
return r;
}
Void Thread::
cancel ()
{
if (Int e = pthread_cancel (id_))
throw Implementation (e);
}
Void Thread::
exit (Void* ret)
{
pthread_exit (ret);
}
Shptr<Thread> Thread::
self ()
{
Thread* p (reinterpret_cast<Thread*> (pthread_getspecific (Bits::key)));
if (p != 0)
return Shptr<Thread> (MM::inc_ref (p));
else
throw Foreign ();
}
Void Thread::
test_cancel ()
{
pthread_testcancel ();
}
Thread::
~Thread ()
{
tout << "thread is being destroyed.";
Lock lock (mutex_);
if (!detached_)
{
if (Int e = pthread_detach (id_))
throw Implementation (e);
}
}
}
}
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