Hi all,
Does any one knows, if I create a thread in a method and start some
processing in it, what happens when this thread object goes out of
scope. Is it garbage collected (I assume yes, as it is a regular object
and there is no reference to it). If it is, what happens with the
executed code inside the thread? What kind of exceptions can I receive
(if any) and how to capture them (AppDomain.Unha ndledException may help,
but how do I recognize that this is in the collected thread?).
This is a sample:
using System;
using System.Threadin g;
namespace Test {
public class Test {
static ManualResetEven t evnt = new ManualResetEven t(false);
static void CreateThread()
{
Thread t = new Thread(new ThreadStart(Thr eadMethod));
t.IsBackground = true;
t.Start();
}
static void ThreadMethod()
{
Console.WriteLi ne("Thread started");
evnt.Set();
while (true)
{
Console.WriteLi ne("From thread.");
Thread.Sleep(10 00);
}
}
[STAThread]
public static void Main()
{
CreateThread();
evnt.WaitOne();
Console.WriteLi ne("press enter to GC");
Console.ReadLin e();
GC.Collect();
GC.WaitForPendi ngFinalizers();
Console.WriteLi ne("press enter for exit");
Console.ReadLin e();
}
}
}
The thread continues to run even after GC.Collect? Why? What holds a
reference?
And why TaskManager shows 6 threads running (before and after the
GC.Collect call) and 5 after that? I can count to 3 - the main one, GC
thread and my worker thread. What are the others?
Thanks
Sunny 5 2251
"Sunny" <su***@newsgrou ps.nospam> wrote in message
news:e7******** ******@tk2msftn gp13.phx.gbl... Hi all,
Does any one knows, if I create a thread in a method and start some processing in it, what happens when this thread object goes out of scope.
Nothing in particular.
Is it garbage collected (I assume yes, as it is a regular object and there is no reference to it).
No. The CLR (in effect, though perhaps not literally) keeps a pointer to
each active thread. Until the thread exits, it will not be collected.
Hi Sunny
Threads are considered GC Roots by the runtime, so they are not collected (otherwise you'd have to have a strong reference to every running thread).
Hope that helps
-Chris
-------------------- Hi all,
Does any one knows, if I create a thread in a method and start some processing in it, what happens when this thread object goes out of scope. Is it garbage collected (I assume yes, as it is a regular object and there is no reference to it). If it is, what happens with the executed code inside the thread? What kind of exceptions can I receive (if any) and how to capture them (AppDomain.Unha ndledException may help, but how do I recognize that this is in the collected thread?).
This is a sample:
using System; using System.Threadin g;
namespace Test {
public class Test {
static ManualResetEven t evnt = new ManualResetEven t(false);
static void CreateThread() { Thread t = new Thread(new ThreadStart(Thr eadMethod)); t.IsBackground = true; t.Start(); }
static void ThreadMethod() { Console.WriteLi ne("Thread started"); evnt.Set(); while (true) { Console.WriteLi ne("From thread."); Thread.Sleep(10 00); } }
[STAThread] public static void Main() { CreateThread(); evnt.WaitOne(); Console.WriteLi ne("press enter to GC"); Console.ReadLin e(); GC.Collect(); GC.WaitForPendi ngFinalizers(); Console.WriteLi ne("press enter for exit"); Console.ReadLin e(); } } }
The thread continues to run even after GC.Collect? Why? What holds a reference?
And why TaskManager shows 6 threads running (before and after the GC.Collect call) and 5 after that? I can count to 3 - the main one, GC thread and my worker thread. What are the others?
Thanks Sunny
--
This posting is provided "AS IS" with no warranties, and confers no rights. Use of included script samples are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm
Note: For the benefit of the community-at-large, all responses to this message are best directed to the newsgroup/thread from which they originated.
Thanks Mike,
exactly what I see, but I was not sure if this is the expected
behaviour.
Sunny
In article <er************ **@TK2MSFTNGP10 .phx.gbl>, ms************* @hotmail.com says... "Sunny" <su***@newsgrou ps.nospam> wrote in message news:e7******** ******@tk2msftn gp13.phx.gbl... Hi all,
Does any one knows, if I create a thread in a method and start some processing in it, what happens when this thread object goes out of scope.
Nothing in particular.
Is it garbage collected (I assume yes, as it is a regular object and there is no reference to it).
No. The CLR (in effect, though perhaps not literally) keeps a pointer to each active thread. Until the thread exits, it will not be collected.
Thanks Chris,
can you provide a link for more info, it is interesting subject :). I.e.
I'm interested when they are considered collectable, etc.
Sunny
In article <9s************ **@cpmsftngxa10 .phx.gbl>, cl***@online.mi crosoft.com says... Hi Sunny
Threads are considered GC Roots by the runtime, so they are not collected (otherwise you'd have to have a strong reference to every running thread).
Hope that helps -Chris
-------------------- Hi all,
Does any one knows, if I create a thread in a method and start some processing in it, what happens when this thread object goes out of scope. Is it garbage collected (I assume yes, as it is a regular object and there is no reference to it). If it is, what happens with the executed code inside the thread? What kind of exceptions can I receive (if any) and how to capture them (AppDomain.Unha ndledException may help, but how do I recognize that this is in the collected thread?).
This is a sample:
using System; using System.Threadin g;
namespace Test {
public class Test {
static ManualResetEven t evnt = new ManualResetEven t(false);
static void CreateThread() { Thread t = new Thread(new ThreadStart(Thr eadMethod)); t.IsBackground = true; t.Start(); }
static void ThreadMethod() { Console.WriteLi ne("Thread started"); evnt.Set(); while (true) { Console.WriteLi ne("From thread."); Thread.Sleep(10 00); } }
[STAThread] public static void Main() { CreateThread(); evnt.WaitOne(); Console.WriteLi ne("press enter to GC"); Console.ReadLin e(); GC.Collect(); GC.WaitForPendi ngFinalizers(); Console.WriteLi ne("press enter for exit"); Console.ReadLin e(); } } }
The thread continues to run even after GC.Collect? Why? What holds a reference?
And why TaskManager shows 6 threads running (before and after the GC.Collect call) and 5 after that? I can count to 3 - the main one, GC thread and my worker thread. What are the others?
Thanks Sunny
Hi Sunny
As long as the thread is running, it will not be collected. This is because a running thread is an implicit GC root, with a thread of execution. Without that root, your thread couldn't
run to completion if it went out of scope. Take a look in MSDN for articles on threading and GC for more information.
-Chris
-------------------- From: Sunny <su***@newsgrou ps.nospam> Subject: RE: threads and garbage collection Date: Tue, 27 Jul 2004 17:48:56 -0500 References: <e7************ **@tk2msftngp13 .phx.gbl> <9s************ **@cpmsftngxa10 .phx.gbl> Organization : Iceberg Wireless LLC MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit X-Newsreader: MicroPlanet Gravity v2.60 Message-ID: <uV************ *@tk2msftngp13. phx.gbl> Newsgroups: microsoft.publi c.dotnet.langua ges.csharp NNTP-Posting-Host: 216.17.90.91 Lines: 1 Path: cpmsftngxa10.ph x.gbl!TK2MSFTNG XA01.phx.gbl!TK 2MSFTNGP08.phx. gbl!tk2msftngp1 3.phx.gbl Xref: cpmsftngxa10.ph x.gbl microsoft.publi c.dotnet.langua ges.csharp:2613 50 X-Tomcat-NG: microsoft.publi c.dotnet.langua ges.csharp
Thanks Chris,
can you provide a link for more info, it is interesting subject :). I.e. I'm interested when they are considered collectable, etc.
Sunny
In article <9s************ **@cpmsftngxa10 .phx.gbl>, cl***@online.m icrosoft.com says... Hi Sunny
Threads are considered GC Roots by the runtime, so they are not collected (otherwise you'd have to have a strong reference to every running thread).
Hope that helps -Chris
-------------------- > >Hi all, > >Does any one knows, if I create a thread in a method and start some >processing in it, what happens when this thread object goes out of >scope. Is it garbage collected (I assume yes, as it is a regular object >and there is no reference to it). If it is, what happens with the >executed code inside the thread? What kind of exceptions can I receive >(if any) and how to capture them (AppDomain.Unha ndledException may help, >but how do I recognize that this is in the collected thread?). > >This is a sample: > >using System; >using System.Threadin g; > >namespace Test { > >public class Test { > > static ManualResetEven t evnt = new ManualResetEven t(false); > > static void CreateThread() > { > Thread t = new Thread(new ThreadStart(Thr eadMethod)); > t.IsBackground = true; > t.Start(); > } > > static void ThreadMethod() > { > Console.WriteLi ne("Thread started"); > evnt.Set(); > while (true) > { > Console.WriteLi ne("From thread."); > Thread.Sleep(10 00); > } > } > > [STAThread] > public static void Main() > { > CreateThread(); > evnt.WaitOne(); > Console.WriteLi ne("press enter to GC"); > Console.ReadLin e(); > GC.Collect(); > GC.WaitForPendi ngFinalizers(); > Console.WriteLi ne("press enter for exit"); > Console.ReadLin e(); > } >} >} > > >The thread continues to run even after GC.Collect? Why? What holds a >reference? > >And why TaskManager shows 6 threads running (before and after the >GC.Collect call) and 5 after that? I can count to 3 - the main one, GC >thread and my worker thread. What are the others? > >Thanks >Sunny >
--
This posting is provided "AS IS" with no warranties, and confers no rights. Use of included script samples are subject to the terms specified at http://www.microsoft.com/info/cpyright.htm
Note: For the benefit of the community-at-large, all responses to this message are best directed to the newsgroup/thread from which they originated. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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