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Report From: Delphi-BCB/RTL/Delphi/Thread support [ Add a report in this area ]

Report #: 67691

Status: Closed

BeginThread memory leak

Project: Delphi

Build #: 12.0.3155.16733

Version: 12.0

Submitted By: Alexey Kazantsev

Report Type: Minor failure / Design problem

Date Reported: 10/8/2008 9:13:54 PM

Severity: Infrequently encountered problem

Last Updated: 3/20/2012 2:24:39 AM

Platform: All versions

Internal Tracking #: 266121

Resolution: Fixed (Resolution Comments)

Resolved in Build: : 15.0.3573.25335

Duplicate of: None

Voting and Rating

Overall Rating: (1 Total Rating)

4.00 out of 5

Total Votes: None

Description

If BeginThread cannot create a new thread (any reason) occures memory leak.

Steps to Reproduce:

function BeginThread(SecurityAttributes: Pointer; StackSize: LongWord;
  ThreadFunc: TThreadFunc; Parameter: Pointer; CreationFlags: LongWord;
  var ThreadId: LongWord): Integer;
var
  P: PThreadRec;
begin
  if Assigned(SystemThreadFuncProc) then
    P := PThreadRec(SystemThreadFuncProc(ThreadFunc, Parameter))
  else
  begin
    New(P);
    P.Func := ThreadFunc;
    P.Parameter := Parameter;
  end;
  IsMultiThread := TRUE;
  Result := CreateThread(SecurityAttributes, StackSize, @ThreadWrapper, P,
    CreationFlags, ThreadID);
end;

Variable P : PThreadRec allocated in BeginThread release in ThreadWrapper which not executed if BeginThread not successful.

Workarounds

None

Attachment

None

Comments

Lucian Radulescu at 10/12/2008 7:57:29 PM -

What "any reason"? if Createthread fails, your application is doomed anyway, who cares about a few bytes memory leak :-)

Alexey Kazantsev at 10/13/2008 2:28:25 AM -

No. This may be thread from thread pool. I have situation, when BeginThread fails, but this no kill my application.

Lucian Radulescu at 1/20/2009 1:39:30 PM -

>This may be thread from thread pool

So what ... again, if the system can not create threads your application is doomed anyway :-)

Alexey Kazantsev at 2/1/2009 3:57:02 PM -

Not. Pool can have various count of threads.

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