synchronous call

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Ivan - 13 Dec 2005 20:05 GMT

how to make a single method thread safe?

example:
class A
{
void func() {}
}

thread1:
A a1 = new A();
a.func();

thread2:
A a2 = new A();
a.func();

Ivan

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Nicholas Paldino [.NET/C# MVP] - 13 Dec 2005 21:51 GMT

Ivan,

The code that you just posted is actually thread safe because it doesn't
do anything.

Making an object or method call thread-safe depends on the granularity
you are looking to achieve, along with the resources you are trying to make
thread safe.

Can you be more specific about what you are trying to make thread-safe?

Signature

- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard.caspershouse.com

> how to make a single method thread safe?
>
[quoted text clipped - 13 lines]
>
> Ivan

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Ivan - 13 Dec 2005 21:59 GMT

A.func() needs to be application-wide thread safe.
Having the example in mind, if a1 enters func(), a2 should wait.

example:
class A
{
void func() {}
}

thread1:
A a1 = new A();
a1.func();

thread2:
A a2 = new A();
a2.func();

Ivan

Reply to this Message

Nicholas Paldino [.NET/C# MVP] - 13 Dec 2005 23:54 GMT

Ivan,

Check out the MethodImpl attribute, and pass in the
MethodImplOptions.Synchronized value to the attribute.

However, this will make any call on the object (you need to apply it to
every method) hold whenever any other method is called on any other thread.

Again, you didn't show anything that you were trying to synchronize, so
this is the most generic code you could use.

Signature

- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard.caspershouse.com

> A.func() needs to be application-wide thread safe.
> Having the example in mind, if a1 enters func(), a2 should wait.
[quoted text clipped - 14 lines]
>
> Ivan

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Ivan - 14 Dec 2005 21:54 GMT

> Again, you didn't show anything that you were trying to synchronize, so ...

synchronized code is substituted for simplicity by A.func()
this is code that only one thread needs to be in.
if I make it static and use this attribute (thanks for the attribute), my problem's fixed.

example:

using System.Runtime.CompilerServices;

class A
{
[MethodImplAttribute(MethodImplOptions.Synchronized)]
public static void func() {}
}

thread1:
A a1 = new A();
a1.func();

thread2:
A a2 = new A();
a2.func();

Ivan

> Ivan,
>
[quoted text clipped - 3 lines]
> However, this will make any call on the object (you need to apply it to
> every method) hold whenever any other method is called on any other thread.

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synchronous call

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