Qt-interest Archive, January 2007
No public msleep/usleep?
Message 1 in thread
Why are the msleep and usleep static methods of QThread declared as
protected? In some code that I write with Qt, especially in Qt 4 where
you can use QCoreApplication, I need to introduce a small delay (for
example in serial port communications) but the code isn't in a QThread
so I ended up writing my own little msleep function that calls Sleep on
Windows and usleep on Linux. Ideally I would have liked to use
something like Qthread::currentThread()->msleep(100) but I can't since
msleep in QThread is protected.
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Message 2 in thread
Brad Pepers wrote:
> Why are the msleep and usleep static methods of QThread declared as
> protected? In some code that I write with Qt, especially in Qt 4 where
> you can use QCoreApplication, I need to introduce a small delay (for
> example in serial port communications) but the code isn't in a QThread
> so I ended up writing my own little msleep function that calls Sleep on
> Windows and usleep on Linux. Ideally I would have liked to use
> something like Qthread::currentThread()->msleep(100) but I can't since
> msleep in QThread is protected.
>
class Helper: public QThread {
public:
static void msleep(int ms)
{
QThread::msleep(ms);
}
};
does the trick.
Not nice, but certainly better than providing own implementations.
/eno
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Message 3 in thread
<troll@xxxxxxxxxxxx> wrote in message news:459EA527.6040206@xxxxxxxxxxxxxxx
> Brad Pepers wrote:
> > Why are the msleep and usleep static methods of QThread declared as
> > protected? In some code that I write with Qt, especially in Qt 4 where
> > you can use QCoreApplication, I need to introduce a small delay (for
> > example in serial port communications) but the code isn't in a QThread
> > so I ended up writing my own little msleep function that calls Sleep on
> > Windows and usleep on Linux. Ideally I would have liked to use
> > something like Qthread::currentThread()->msleep(100) but I can't since
> > msleep in QThread is protected.
> >
>
> class Helper: public QThread {
> public:
> static void msleep(int ms)
> {
> QThread::msleep(ms);
> }
> };
>
> does the trick.
>
> Not nice, but certainly better than providing own implementations.
void sleep(unsigned long msecs) {
QWaitCondition w;
QMutex sleepmutex;
sleepmutex.lock();
w.wait(&sleepmutex, msecs);
sleepmutex.unlock();
}
Seems to work though it's probably not the most
efficient. We mostly use boost threads
so I didn't like the idea of having
two thread classes in the same project.
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Message 4 in thread
troll@xxxxxxxxxxxx wrote:
> Brad Pepers wrote:
>> Why are the msleep and usleep static methods of QThread declared as
>> protected? In some code that I write with Qt, especially in Qt 4
>> where you can use QCoreApplication, I need to introduce a small delay
>> (for example in serial port communications) but the code isn't in a
>> QThread so I ended up writing my own little msleep function that calls
>> Sleep on Windows and usleep on Linux. Ideally I would have liked to
>> use something like Qthread::currentThread()->msleep(100) but I can't
>> since msleep in QThread is protected.
>>
>
> class Helper: public QThread {
> public:
> static void msleep(int ms)
> {
> QThread::msleep(ms);
> }
> };
>
> does the trick.
>
> Not nice, but certainly better than providing own implementations.
True but I was worried there was some reason that QThread didn't make
the methods public. If there isn't, I'll just do that but it seems an
ugly thing when the methods should just be public.
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Message 5 in thread
Hi,
> [...]
> Windows and usleep on Linux. Ideally I would have liked to use
> something like Qthread::currentThread()->msleep(100) but I can't since
> msleep in QThread is protected.
You wouldn't be do that anyway since they are static methods.
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Message 6 in thread
I wrote:
>> [...]
>> Windows and usleep on Linux. Ideally I would have liked to use
>> something like Qthread::currentThread()->msleep(100) but I can't since
>> msleep in QThread is protected.
>
> You wouldn't be do that anyway since they are static methods.
Sorry, you could do that of course:
Qthread::currentThread()->msleep(100)
which would be equivalent to:
Qthread::msleep(100)
but the following:
getSomeOtherthread()->msleep(100)
wouldn't do what expected.
I guess this is why it was decided to make the function protected, to
prevent some users from shooting themselves in the foot, although it may
also annoy other users who do know what they're doing.
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Message 7 in thread
I use the following:
//-----------------------------------------------------------------
// This class let's us sleep in seconds, milleseconds, and microseconds
class sotoSleep : public QThread
{
public:
static void sleep(unsigned long secs)
{
QThread::sleep(secs);
}
static void msleep(unsigned long msecs)
{
QThread::msleep(msecs);
}
static void usleep(unsigned long usecs)
{
QThread::usleep(usecs);
}
};
Then I can do this:
sotoSleep::sleep(1); // for seconds
sotoSleep::msleep(1000); // for milliseconds
sotoSleep::sleep(1000000); // for microseconds.
Pepsiman
-----Original Message-----
From: Brad Pepers [mailto:brad@xxxxxxxxxxxxxxx]
Sent: Friday, January 05, 2007 1:00 PM
To: qt-interest@xxxxxxxxxxxxx
Subject: No public msleep/usleep?
Why are the msleep and usleep static methods of QThread declared as
protected? In some code that I write with Qt, especially in Qt 4 where
you can use QCoreApplication, I need to introduce a small delay (for
example in serial port communications) but the code isn't in a QThread
so I ended up writing my own little msleep function that calls Sleep on
Windows and usleep on Linux. Ideally I would have liked to use
something like Qthread::currentThread()->msleep(100) but I can't since
msleep in QThread is protected.
--
[ signature omitted ]
