RFR 8058113 Execution of OnOutOfMemoryError command hangs on linux-sparc

David Holmes david.holmes at oracle.com
Tue Feb 3 01:18:19 UTC 2015

Looks good.


On 3/02/2015 9:21 AM, Gerald Thornbrugh wrote:
> Hi,
> Please review my JDK7u change for JDK-8058113, "Execution of
> OnOutOfMemoryError command hangs on linux-sparc"
> The linux fork_and_exec() function in os_linux.cpp requires that a call
> be made directly to "syscall(fork)" to
> stay multi-thread safe.  The linux/sparc version of "syscall(fork)"
> returns the "is_child" flag in a register that
> is used to determine if the current thread is the child thread. This
> change creates the function sparc_fork()
> that uses the correct assembly code to call the linux/sparc version of
> "syscall(fork)" and returns the process
> id and "is child" flag.
> Webrev:
> http://cr.openjdk.java.net/~dcubed/gthornbr/8058113-webrev/5-for-jdk7u/
> It was determined that this fix should not be putback into JDK8 or
> JDK9.  A bug will be filed to look into
> a better way of doing a multi-thread safe "fork and exec" for all linux
> platforms in JDK8 and JDK9.
> I have completed JPRT and Aurora test runs on all platforms including 32
> and 64 bit linux platforms without issues.
> I have also completed JDK7u JPRT testing on linux/sparc 64 bit platforms
> without issues.
> I also ran the OnOutOfMemoryError test on linux/sparc 64 bit platform
> and the fix addressed the issue.
> Thanks,
> Gerald

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