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tqt3/src/kernel/qthread_unix.cpp

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/****************************************************************************
**
** TQThread class for Unix
**
** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the kernel module of the TQt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free TQt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
** included in the packaging of this file. Licensees holding valid TQt
** Commercial licenses may use this file in accordance with the TQt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#if defined(TQT_THREAD_SUPPORT)
#include "qplatformdefs.h"
typedef pthread_mutex_t Q_MUTEX_T;
#include "ntqthread.h"
#include <private/qthreadinstance_p.h>
#include <private/qmutex_p.h>
#include <private/qmutexpool_p.h>
#include <ntqthreadstorage.h>
#include <ntqapplication.h>
#include <errno.h>
#include <sched.h>
#if defined(QT_USE_GLIBMAINLOOP)
#include <glib.h>
#endif // QT_USE_GLIBMAINLOOP
static TQMutexPool *qt_thread_mutexpool = 0;
#if defined(Q_C_CALLBACKS)
extern "C" {
#endif
typedef void*(*TQtThreadCallback)(void*);
static pthread_once_t storage_key_once = PTHREAD_ONCE_INIT;
static pthread_key_t storage_key;
static void create_storage_key()
{
pthread_key_create( &storage_key, NULL );
}
#if defined(Q_C_CALLBACKS)
}
#endif
/**************************************************************************
** TQThreadInstance
*************************************************************************/
void TQThreadInstance::setCurrentThread(TQThread *thread)
{
pthread_once(&storage_key_once, create_storage_key);
pthread_setspecific(storage_key, thread);
}
TQThreadInstance *TQThreadInstance::current()
{
TQThreadInstance *ret = NULL;
pthread_once( &storage_key_once, create_storage_key );
TQThread *thread = (TQThread *) pthread_getspecific( storage_key );
if (thread) {
ret = thread->d;
}
return ret;
}
void TQThreadInstance::init(unsigned int stackSize)
{
stacksize = stackSize;
args[0] = args[1] = 0;
thread_storage = 0;
finished = FALSE;
running = FALSE;
orphan = FALSE;
disableThreadPostedEvents = FALSE;
pthread_cond_init(&thread_done, NULL);
thread_id = 0;
eventLoop = 0;
cleanupType = TQThread::CleanupMergeObjects;
// threads have not been initialized yet, do it now
if (! qt_thread_mutexpool) TQThread::initialize();
}
void TQThreadInstance::deinit()
{
pthread_cond_destroy(&thread_done);
}
void *TQThreadInstance::start( void *_arg )
{
void **arg = (void **) _arg;
#if defined(QT_USE_GLIBMAINLOOP)
// This is the first time we have access to the native pthread ID of this newly created thread
((TQThreadInstance*)arg[1])->thread_id = pthread_self();
#endif // QT_USE_GLIBMAINLOOP
#ifdef QT_DEBUG
tqDebug("TQThreadInstance::start: Setting thread storage to %p\n", (TQThread *) arg[0]);
#endif // QT_DEBUG
setCurrentThread( (TQThread *) arg[0] );
pthread_cleanup_push( TQThreadInstance::finish, arg[1] );
pthread_testcancel();
( (TQThread *) arg[0] )->run();
pthread_cleanup_pop( TRUE );
return 0;
}
void TQThreadInstance::finish( void * )
{
TQThreadInstance *d = current();
if ( ! d ) {
#ifdef QT_CHECK_STATE
tqWarning( "TQThread: internal error: zero data for running thread." );
#endif // QT_CHECK_STATE
return;
}
#ifdef QT_DEBUG
tqDebug("TQThreadInstance::finish: In TQThreadInstance::finish for thread %p\n", (TQThread*)d->args[0]);
#endif // QT_DEBUG
TQApplication::threadTerminationHandler((TQThread*)d->args[0]);
TQMutexLocker locker( d->mutex() );
d->running = FALSE;
d->finished = TRUE;
d->args[0] = d->args[1] = 0;
TQThreadStorageData::finish( d->thread_storage );
d->thread_storage = 0;
d->thread_id = 0;
pthread_cond_broadcast(&d->thread_done);
if (d->orphan) {
d->deinit();
delete d;
}
}
TQMutex *TQThreadInstance::mutex() const
{
return qt_thread_mutexpool ? qt_thread_mutexpool->get( (void *) this ) : 0;
}
void TQThreadInstance::terminate()
{
if ( ! thread_id ) return;
pthread_cancel( thread_id );
}
/**************************************************************************
** TQThread
*************************************************************************/
/*!
This returns the thread handle of the currently executing thread.
\warning The handle returned by this function is used for internal
purposes and should \e not be used in any application code. On
Windows, the returned value is a pseudo handle for the current
thread, and it cannot be used for numerical comparison.
*/
TQt::HANDLE TQThread::currentThread()
{
return (HANDLE) pthread_self();
}
/*! \internal
Initializes the TQThread system.
*/
void TQThread::initialize()
{
if ( ! tqt_global_mutexpool )
tqt_global_mutexpool = new TQMutexPool( TRUE, 73 );
if ( ! qt_thread_mutexpool )
qt_thread_mutexpool = new TQMutexPool( FALSE, 127 );
}
/*! \internal
Cleans up the TQThread system.
*/
void TQThread::cleanup()
{
delete tqt_global_mutexpool;
delete qt_thread_mutexpool;
tqt_global_mutexpool = 0;
qt_thread_mutexpool = 0;
}
/*!
Ends the execution of the calling thread and wakes up any threads
waiting for its termination.
*/
void TQThread::exit()
{
pthread_exit( 0 );
}
/* \internal
helper function to do thread sleeps, since usleep()/nanosleep()
aren't reliable enough (in terms of behavior and availability)
*/
static void thread_sleep( struct timespec *ti )
{
pthread_mutex_t mtx;
pthread_cond_t cnd;
pthread_mutex_init(&mtx, 0);
pthread_cond_init(&cnd, 0);
pthread_mutex_lock( &mtx );
(void) pthread_cond_timedwait( &cnd, &mtx, ti );
pthread_mutex_unlock( &mtx );
pthread_cond_destroy( &cnd );
pthread_mutex_destroy( &mtx );
}
/*!
System independent sleep. This causes the current thread to sleep
for \a secs seconds.
*/
void TQThread::sleep( unsigned long secs )
{
struct timeval tv;
gettimeofday( &tv, 0 );
struct timespec ti;
ti.tv_sec = tv.tv_sec + secs;
ti.tv_nsec = ( tv.tv_usec * 1000 );
thread_sleep( &ti );
}
/*!
System independent sleep. This causes the current thread to sleep
for \a msecs milliseconds
*/
void TQThread::msleep( unsigned long msecs )
{
struct timeval tv;
gettimeofday( &tv, 0 );
struct timespec ti;
ti.tv_nsec = ( tv.tv_usec + ( msecs % 1000 ) * 1000 ) * 1000;
ti.tv_sec = tv.tv_sec + ( msecs / 1000 ) + ( ti.tv_nsec / 1000000000 );
ti.tv_nsec %= 1000000000;
thread_sleep( &ti );
}
/*!
System independent sleep. This causes the current thread to sleep
for \a usecs microseconds
*/
void TQThread::usleep( unsigned long usecs )
{
struct timeval tv;
gettimeofday( &tv, 0 );
struct timespec ti;
ti.tv_nsec = ( tv.tv_usec + ( usecs % 1000000 ) ) * 1000;
ti.tv_sec = tv.tv_sec + ( usecs / 1000000 ) + ( ti.tv_nsec / 1000000000 );
ti.tv_nsec %= 1000000000;
thread_sleep( &ti );
}
/*!
Begins execution of the thread by calling run(), which should be
reimplemented in a TQThread subclass to contain your code. The
operating system will schedule the thread according to the \a
priority argument.
If you try to start a thread that is already running, this
function will wait until the the thread has finished and then
restart the thread.
\sa Priority
*/
void TQThread::start(Priority priority)
{
TQMutexLocker locker( d->mutex() );
if ( d->running )
pthread_cond_wait(&d->thread_done, &locker.mutex()->d->handle);
d->running = TRUE;
d->finished = FALSE;
int ret;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
#if !defined(Q_OS_OPENBSD) && defined(_POSIX_THREAD_PRIORITY_SCHEDULING) && (_POSIX_THREAD_PRIORITY_SCHEDULING-0 >= 0)
switch (priority) {
case InheritPriority:
{
pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED);
break;
}
default:
{
int sched_policy;
if (pthread_attr_getschedpolicy(&attr, &sched_policy) != 0) {
// failed to get the scheduling policy, don't bother
// setting the priority
tqWarning("TQThread: cannot determine default scheduler policy");
break;
}
int prio_min = sched_get_priority_min(sched_policy);
int prio_max = sched_get_priority_max(sched_policy);
if (prio_min == -1 || prio_max == -1) {
// failed to get the scheduling parameters, don't
// bother setting the priority
tqWarning("TQThread: cannot determine scheduler priority range");
break;
}
int prio;
switch (priority) {
case IdlePriority:
prio = prio_min;
break;
case HighestPriority:
prio = prio_max;
break;
default:
// crudely scale our priority enum values to the prio_min/prio_max
prio = (((prio_max - prio_min) / TimeCriticalPriority) *
priority) + prio_min;
prio = TQMAX(prio_min, TQMIN(prio_max, prio));
break;
}
sched_param sp;
sp.sched_priority = prio;
pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED);
pthread_attr_setschedparam(&attr, &sp);
break;
}
}
#endif // _POSIX_THREAD_PRIORITY_SCHEDULING
if ( d->stacksize > 0 ) {
#if defined(_POSIX_THREAD_ATTR_STACKSIZE) && (_POSIX_THREAD_ATTR_STACKSIZE-0 > 0)
ret = pthread_attr_setstacksize( &attr, d->stacksize );
#else
ret = ENOSYS; // stack size not supported, automatically fail
#endif // _POSIX_THREAD_ATTR_STACKSIZE
if ( ret ) {
#ifdef QT_CHECK_STATE
tqWarning( "TQThread::start: thread stack size error: %s", strerror( ret ) ) ;
#endif // QT_CHECK_STATE
// we failed to set the stacksize, and as the documentation states,
// the thread will fail to run...
d->running = FALSE;
d->finished = FALSE;
return;
}
}
d->args[0] = this;
d->args[1] = d;
#if defined(QT_USE_GLIBMAINLOOP)
// The correct thread_id is set in TQThreadInstance::start using the value of d->args[1]
d->thread_id = 0;
// Legacy glib versions require this threading system initialization call
if (!GLIB_CHECK_VERSION (2, 32, 0)) {
if( ! g_thread_get_initialized () ) {
g_thread_init(NULL);
}
}
GThread* glib_thread_handle = g_thread_create((GThreadFunc)TQThreadInstance::start, d->args, false, NULL);
if (glib_thread_handle) {
ret = 0;
}
else {
ret = -1;
}
#else // QT_USE_GLIBMAINLOOP
ret = pthread_create( &d->thread_id, &attr, (TQtThreadCallback)TQThreadInstance::start, d->args );
#if defined (Q_OS_HPUX)
if (ret == EPERM) {
pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED);
ret = pthread_create(&d->thread_id, &attr, (TQtThreadCallback)TQThreadInstance::start, d->args);
}
#endif
pthread_attr_destroy( &attr );
#endif // QT_USE_GLIBMAINLOOP
if ( ret ) {
#ifdef QT_CHECK_STATE
tqWarning( "TQThread::start: thread creation error: %s", strerror( ret ) );
#endif // QT_CHECK_STATE
d->running = FALSE;
d->finished = FALSE;
d->args[0] = d->args[1] = 0;
}
}
void TQThread::start()
{
start(InheritPriority);
}
/*!
A thread calling this function will block until either of these
conditions is met:
\list
\i The thread associated with this TQThread object has finished
execution (i.e. when it returns from \l{run()}). This function
will return TRUE if the thread has finished. It also returns
TRUE if the thread has not been started yet.
\i \a time milliseconds has elapsed. If \a time is ULONG_MAX (the
default), then the wait will never timeout (the thread must
return from \l{run()}). This function will return FALSE if the
wait timed out.
\endlist
This provides similar functionality to the POSIX \c pthread_join() function.
*/
bool TQThread::wait( unsigned long time )
{
TQMutexLocker locker( d->mutex() );
if ( d->thread_id == pthread_self() ) {
#ifdef QT_CHECK_STATE
tqWarning( "TQThread::wait: thread tried to wait on itself" );
#endif // QT_CHECK_STATE
return FALSE;
}
if ( d->finished || ! d->running ) {
return TRUE;
}
int ret;
if (time != ULONG_MAX) {
struct timeval tv;
gettimeofday(&tv, 0);
timespec ti;
ti.tv_nsec = (tv.tv_usec + (time % 1000) * 1000) * 1000;
ti.tv_sec = tv.tv_sec + (time / 1000) + (ti.tv_nsec / 1000000000);
ti.tv_nsec %= 1000000000;
ret = pthread_cond_timedwait(&d->thread_done, &locker.mutex()->d->handle, &ti);
}
else {
ret = pthread_cond_wait(&d->thread_done, &locker.mutex()->d->handle);
}
#ifdef QT_CHECK_RANGE
if (ret && ret != ETIMEDOUT) {
tqWarning("Wait condition wait failure: %s",strerror(ret));
}
#endif
return (ret == 0);
}
/*!
Returns the current cleanup behaviour of the thread.
\sa setCleanupType
\sa CleanupType
*/
TQThread::CleanupType TQThread::cleanupType() const {
return (TQThread::CleanupType)d->cleanupType;
}
/*!
Sets the current cleanup behaviour of the thread. The default,
TQThread::CleanupMergeObjects, will merge any objects owned by this thread
with the main GUI thread when this thread is terminated.
If faster thread termination performance is desired, TQThread::CleanupNone
may be specified instead. However, this is not recommended as any objects
owned by this thread on termination can then cause events to become "stuck"
in the global event queue, leading to high CPU usage and other undesirable
behavior. You have been warned!
\sa cleanupType
\sa CleanupType
*/
void TQThread::setCleanupType(CleanupType type) {
d->cleanupType = type;
}
/*!
Returns a pointer to the currently executing TQThread. If the
current thread was not started using the TQThread API, this
function returns zero.
Note that TQApplication creates a TQThread object to represent the
main thread; calling this function from main() after creating
TQApplication will return a valid pointer.
*/
TQThread *TQThread::currentThreadObject()
{
pthread_once(&storage_key_once, create_storage_key);
return reinterpret_cast<TQThread *>(pthread_getspecific(storage_key));
}
#endif // TQT_THREAD_SUPPORT