Mail Archives: cygwin/2011/04/04/08:49:50
Hallo,
it seems that mq_unlink and/or mq_open forget to close some handles (5 to b=
e precise).
How to test:
Execute the following code and watch the number of handles in the windows t=
ask-manager (processes tab, you can add a column there). For me it increase=
s by 5 with every loop.
Tested with this DLL: cygwin1-20110327.dll
Thanks,
Manuel
#include <stdio.h>
#include <stdlib.h>
#include <mqueue.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
int main(void)
{
int res;
int i =3D 0;
char msgQueueTestName[] =3D "./testQueue";
mqd_t testQueue;
struct mq_attr attrQueue;
memset(&attrQueue,0x00,sizeof(attrQueue));
attrQueue.mq_maxmsg =3D 10; /* room for X messages in the queue */
attrQueue.mq_msgsize =3D 20; /* maximum size of a message */
while(1)
{
sleep(1);
i++;
printf("Loop #%d\n", i); fflush(stdout);
// Remove old queues before trying to create a new one.
res =3D mq_unlink(msgQueueTestName);
if ((res =3D=3D -1) && (errno !=3D ENOENT))
{
// Don't print anything if the queue can't be unlinked, because it do=
esn't exist.
printf("Failed to unlink msg queue %s: %s %d\n", msgQueueTestName, sys=
_errlist[errno],errno);
}
testQueue =3D mq_open(msgQueueTestName, O_RDWR | O_CREAT | O_EXCL, S_IR=
WXU | S_IRWXG, &attrQueue);
if( testQueue =3D=3D (mqd_t)-1 )
{
printf("Failed to open msg queue %s: %s %d\n", msgQueueTestName, sys_=
errlist[errno],errno);
}
res =3D mq_unlink(msgQueueTestName);
if (res =3D=3D -1)
{
printf("Failed to unlink msg queue %s: %s %d\n", msgQueueTestName, sy=
s_errlist[errno],errno);
}
}
return EXIT_SUCCESS;
}
--
Problem reports: http://cygwin.com/problems.html
FAQ: http://cygwin.com/faq/
Documentation: http://cygwin.com/docs.html
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
- Raw text -