Does lock{} work across methods?

[Tom P.]

I have a class that ahs several methods. It pulls from a queue so it
has to be singleton at that point. The question I have is: does the
lock{} statement work across methods? If I have A(), B(), and C() and
I do this:
A()
{
lock{
SomeWork();
}
}

B()
{
lock{
Some();
Other();
Work();
}
}

Will A() be locked if a thread is currently in B()? Thanks for the
help.

Tom P.

[Pavel Minaev]

On Jul 17, 5:04*pm, "Tom P." <[e-mail]:

I have a class that ahs several methods. It pulls from a queue so it
has to be singleton at that point. The question I have is: does the
lock{} statement work across methods? If I have A(), B(), and C() and
I do this:
A()
{
* lock{
* * * * *SomeWork();
* * *}

}

B()
{
* * *lock{
* * * * * *Some();
* * * * * *Other();
* * * * * *Work();
* * * }

}

Will A() be locked if a thread is currently in B()? Thanks for the
help.

If both locks are on the same object, and the calls are on two
different threads, then, yes, a call to A on one thread will be locked
while another thread is executing B.

[Jon Skeet [C# MVP]]

Tom P. <pa***********@gmail.comwrote:

I have a class that ahs several methods. It pulls from a queue so it
has to be singleton at that point. The question I have is: does the
lock{} statement work across methods? If I have A(), B(), and C() and
I do this:
A()
{
lock{
SomeWork();
}
}

B()
{
lock{
Some();
Other();
Work();
}
}

Will A() be locked if a thread is currently in B()? Thanks for the
help.

That entirely depends on what you put in the bit you've missed out. The
"lock" statement works on a reference - it's not

lock {
code
}

it's

lock(reference) {
code
}

If you use the same reference in the two methods, then the lock will
indeed hold across methods.

See http://pobox.com/~skeet/csharp/threads for more info.

--
Jon Skeet - <sk***@pobox.com>
Web site: http://www.pobox.com/~skeet
Blog: http://www.msmvps.com/jon_skeet
C# in Depth: http://csharpindepth.com