Date: Sun, 2 Jun 2013 08:16:58 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: ????????? <huanghwh@yahoo.com> Cc: "java@freebsd.org" <java@freebsd.org> Subject: Re: System.currentTimeMillis() is totally wrong after call JNA mlockall Message-ID: <20130602051658.GZ3047@kib.kiev.ua> In-Reply-To: <1370140389.34142.YahooMailNeo@web15306.mail.cnb.yahoo.com> References: <1370140389.34142.YahooMailNeo@web15306.mail.cnb.yahoo.com>
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On Sun, Jun 02, 2013 at 10:33:09AM +0800, ????????? wrote:
> Hi,
> I recently found that Cassandra 1.2.4 could not shutdown when enable JNA,
> so I try to solve it, and found that under OpenJDK6/FreeBSD,š
> System.currentTimeMillis() is totally wrong after call JNA mlockall,
> time seams to not change anymore.
You did not specified the version of the system. I assume this is either
9-STABLE or HEAD ? Also, I believe you use TSC as timecounter, check
with the sysctl kern.timecounter.hardware.
Try the patch below. I also added the C program that should exhibit
the same behaviour of reporting the stale time.
diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c
index 3890157..c45b974 100644
--- a/sys/kern/kern_exec.c
+++ b/sys/kern/kern_exec.c
@@ -1050,8 +1050,9 @@ exec_new_vmspace(imgp, sv)
vm_object_reference(obj);
error = vm_map_fixed(map, obj, 0,
sv->sv_shared_page_base, sv->sv_shared_page_len,
- VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
- MAP_COPY_ON_WRITE | MAP_ACC_NO_CHARGE);
+ VM_PROT_READ | VM_PROT_EXECUTE,
+ VM_PROT_READ | VM_PROT_EXECUTE,
+ MAP_INHERIT_SHARE | MAP_ACC_NO_CHARGE);
if (error) {
vm_object_deallocate(obj);
return (error);
/* $Id: time_mlock.c,v 1.4 2013/06/02 05:15:53 kostik Exp kostik $ */
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
int
main(void)
{
time_t t;
pid_t child;
if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1)
err(1, "mlockall");
fflush(stdout);
child = fork();
if (child == -1) {
err(1, "fork");
} else if (child == 0) {
time(&t);
printf("%s", ctime(&t));
sleep(3);
time(&t);
printf("%s", ctime(&t));
}
return (0);
}
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