Re: Thread safety

From:
 arun.darra@gmail.com
Newsgroups:
comp.lang.c++
Date:
Wed, 06 Jun 2007 20:57:19 -0000
Message-ID:
<1181163439.502898.191770@i13g2000prf.googlegroups.com>
On Jun 6, 8:25 pm, Gianni Mariani <gi3nos...@mariani.ws> wrote:

arun.da...@gmail.com wrote:

Are the following thread safe:


Assuming you're using either GCC, VC++ or the Intel compiler...

1. Assuming Object is any simple object
Object* fn()
{
   Object *p = new Object();
   return p;
}


Safe if you use the supplied new operator.

2. is return by value thread safe?


Safe if the copy constructor is thread safe.

3. int *p = new int
is this thread safe?


Safe assuming that p is not used before it is initialized.


Thanks for the reply... i just have 2 quick question:

1. You said that if i use the default new operator then using
Object *p = new Object();
is thread safe right...

but if i have a condition like:
If(thread-1)
Object1* p1 = new Object1();
else if(thread2)
Object2* p1 = new Object2();

and if both thread1 and thread2 are active at the same time and
running the above code then will new still be thread safe?

2. Is the following thread safe:
void fn()
{
  static Object o;
}
assuming multiple threds are active

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