QThreadStorageData Class Reference

#include <qthreadstorage.h>

Public Functions
void **	get () const
	QThreadStorageData (void(*func)(void *))
void **	set (void *p)
	~QThreadStorageData ()

Static Public Functions
static void	finish (void **)

Public Variables
int	id

Detailed Description

Definition at line 55 of file qthreadstorage.h.

Constructors and Destructors

QThreadStorageData()

QThreadStorageData::QThreadStorageData ( void(*)(void *)  func )

explicit

Definition at line 78 of file qthreadstorage.cpp.

{
    QMutexLocker locker(mutex());
    DestructorMap *destr = destructors();
    if (!destr) {
        /*
         the destructors vector has already been destroyed, yet a new
         QThreadStorage is being allocated. this can only happen during global
         destruction, at which point we assume that there is only one thread.
         in order to keep QThreadStorage working, we need somewhere to store
         the data, best place we have in this situation is at the tail of the
         current thread's tls vector. the destructor is ignored, since we have
         no where to store it, and no way to actually call it.
         */
        QThreadData *data = QThreadData::current();
        id = data->tls.count();
        DEBUG_MSG("QThreadStorageData: Allocated id %d, destructor %p cannot be stored", id, func);
        return;
    }
    for (id = 0; id < destr->count(); id++) {
        if (destr->at(id) == 0)
            break;
    }
    if (id == destr->count()) {
        destr->append(func);
    } else {
        (*destr)[id] = func;
    }
    DEBUG_MSG("QThreadStorageData: Allocated id %d, destructor %p", id, func);
}

~QThreadStorageData()

QThreadStorageData::~QThreadStorageData

(

)

Definition at line 109 of file qthreadstorage.cpp.

{
    DEBUG_MSG("QThreadStorageData: Released id %d", id);
    QMutexLocker locker(mutex());
    if (destructors())
        (*destructors())[id] = 0;
}

Functions

finish()

void QThreadStorageData::finish ( void **  p )

static

Definition at line 174 of file qthreadstorage.cpp.

Referenced by QThreadPrivate::finish(), and QCoreApplicationPrivate::~QCoreApplicationPrivate().

{
    QVector<void *> *tls = reinterpret_cast<QVector<void *> *>(p);
    if (!tls || tls->isEmpty() || !mutex())
        return; // nothing to do

    DEBUG_MSG("QThreadStorageData: Destroying storage for thread %p", QThread::currentThread());
    while (!tls->isEmpty()) {
        void *&value = tls->last();
        void *q = value;
        value = 0;
        int i = tls->size() - 1;
        tls->resize(i);

        if (!q) {
            // data already deleted
            continue;
        }

        QMutexLocker locker(mutex());
        void (*destructor)(void *) = destructors()->value(i);
        locker.unlock();

        if (!destructor) {
            if (QThread::currentThread())
                qWarning("QThreadStorage: Thread %p exited after QThreadStorage %d destroyed",
                         QThread::currentThread(), i);
            continue;
        }
        destructor(q); //crash here might mean the thread exited after qthreadstorage was destroyed

        if (tls->size() > i) {
            //re reset the tls in case it has been recreated by its own destructor.
            (*tls)[i] = 0;
        }
    }
    tls->clear();
}

get()

void ** QThreadStorageData::get

(

)

const

Definition at line 117 of file qthreadstorage.cpp.

Referenced by QThreadStorage< QNetworkAccessCache *>::hasLocalData(), qThreadStorage_localData(), and qThreadStorage_localData_const().

{
    QThreadData *data = QThreadData::current();
    if (!data) {
        qWarning("QThreadStorage::get: QThreadStorage can only be used with threads started with QThread");
        return 0;
    }
    QVector<void *> &tls = data->tls;
    if (tls.size() <= id)
        tls.resize(id + 1);
    void **v = &tls[id];

    DEBUG_MSG("QThreadStorageData: Returning storage %d, data %p, for thread %p",
          id,
          *v,
          data->thread);

    return *v ? v : 0;
}

set()

void ** QThreadStorageData::set

(

void *

p

)

Definition at line 137 of file qthreadstorage.cpp.

Referenced by qThreadStorage_localData().

{
    QThreadData *data = QThreadData::current();
    if (!data) {
        qWarning("QThreadStorage::set: QThreadStorage can only be used with threads started with QThread");
        return 0;
    }
    QVector<void *> &tls = data->tls;
    if (tls.size() <= id)
        tls.resize(id + 1);

    void *&value = tls[id];
    // delete any previous data
    if (value != 0) {
        DEBUG_MSG("QThreadStorageData: Deleting previous storage %d, data %p, for thread %p",
                id,
                value,
                data->thread);

        QMutexLocker locker(mutex());
        DestructorMap *destr = destructors();
        void (*destructor)(void *) = destr ? destr->value(id) : 0;
        locker.unlock();

        void *q = value;
        value = 0;

        if (destructor)
            destructor(q);
    }

    // store new data
    value = p;
    DEBUG_MSG("QThreadStorageData: Set storage %d for thread %p to %p", id, data->thread, p);
    return &value;
}

Properties

id

int QThreadStorageData::id

Definition at line 65 of file qthreadstorage.h.

Referenced by get(), and set().

---

The documentation for this class was generated from the following files:

• /src/corelib/thread/qthreadstorage.h
• /src/corelib/thread/qthreadstorage.cpp