Jaroslav Bachorik wrote:
On 27.3.2014 15:49, shanliang wrote:
Hi,
The call
thr.frames(0, frames.size() - 1);
suffers a synchronization issue, the size may be changed after
frames.size() returns.
Any idea why there is a synchronization issue? The code seems to be
intended to run only when a breakpoint is hit and the target thread is
suspended.
Here is the info from JDK-6751643 to which this test was developed to test:
------
This bug can only occur if a debugger has multiple threads and calls any
of the following methods in one thread while simultaneously resuming the
same debuggee thread in a different debugger thread. Debuggers shouldn't
do this because it is a race condition and the result returned by these
methods will vary depending upon just where in the processing of these
methods the resume takes effect. EG, the frameCount() method could
return 6 in a case where the debuggee has already been resumed and there
are no frames.
------
If I do not misunderstand, the check was possibly called before, during
or after resuming.
Shanliang
-JB-
webrev:
http://cr.openjdk.java.net/~sjiang/JDK-6815126/00/
bug:
https://bugs.openjdk.java.net/browse/JDK-6815126
Shanliang
