18 Nov
2016
18 Nov
'16
6:13 a.m.
Hi,
Frank Liu wrote,
Hi All,
Kernel version : 4.4.19-linux4sam_5.4
uclibc version : 1.0.12
uclibc threading support : NPTL
Processor Arch: ARM
Better you switch to uClibc-ng mailinglist for this question.
We create a NONBLOCKING message queue.
The expected behavior is when the message queue is full, calling mq_send would return -1
and set errno to EAGAIN(11). However we are seeing some inconsistent behaviors of
mq_send.
When calling mq_send in a single threaded environment, the expected behavior is
observed.
If the program starts a second thread, which is doing completely different task, calling
mq_send when the queue is full would return -11 instead of -1. Also, the errno is set to
an incorrect value. Values we have seen are 0, 2, which are completely different from the
expected EAGAIN(11).
Can you provide a simple test case to check the behaviour?
best regards
Waldemar
18 Nov
18 Nov
6:45 a.m.
New subject: uclibc(1.0.12) mq_send return value and errno issue
Please see the attached sample code.
If I turn READERS and WRITERS to 0, the test works fine.
Adding another thread in the process by setting a non-zero number to either READERS or
WRITER, the test program crashes due to the assertion at line 99.
Regards
-----Original Message-----
From: Waldemar Brodkorb [mailto:wbx@uclibc-ng.org]
Sent: Friday, November 18, 2016 5:13 PM
To: Frank Liu
Cc: 'uclibc(a)uclibc.org'org'; devel(a)uclibc-ng.org; Dushara Jayasinghe
(dushara(a)successful.com.au)
Subject: Re: uclibc(1.0.12) mq_send return value and errno issue
Hi,
Frank Liu wrote,
Hi All,
Kernel version : 4.4.19-linux4sam_5.4
uclibc version : 1.0.12
uclibc threading support : NPTL
Processor Arch: ARM
Better you switch to uClibc-ng mailinglist for this question.
We create a NONBLOCKING message queue.
The expected behavior is when the message queue is full, calling mq_send would return -1
and set errno to EAGAIN(11). However we are seeing some inconsistent behaviors of
mq_send.
When calling mq_send in a single threaded environment, the expected behavior is
observed.
If the program starts a second thread, which is doing completely different task, calling
mq_send when the queue is full would return -11 instead of -1. Also, the errno is set to
an incorrect value. Values we have seen are 0, 2, which are completely different from the
expected EAGAIN(11).
Can you provide a simple test case to check the behaviour?
best regards
Waldemar
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24 Nov
24 Nov
3:27 a.m.
New subject: uclibc(1.0.12) mq_send return value and errno issue
Hi Frank,
Frank Liu wrote,
Please see the attached sample code.
If I turn READERS and WRITERS to 0, the test works fine.
Adding another thread in the process by setting a non-zero number to either READERS or
WRITER, the test program crashes due to the assertion at line 99.
I think I found the reason for the problem.
Try attached patch,
best regards
Waldemar
25 Nov
25 Nov
3:52 a.m.
New subject: uclibc(1.0.12) mq_send return value and errno issue
Hi Waldemar,
Thanks for the patchset. I can confirm it fixed my issue.
Regards
Frank
-----Original Message-----
From: Waldemar Brodkorb [mailto:wbx@uclibc-ng.org]
Sent: Thursday, November 24, 2016 2:27 PM
To: Frank Liu
Cc: Waldemar Brodkorb; 'uclibc(a)uclibc.org'org'; Dushara Jayasinghe
(dushara(a)successful.com.au); devel(a)uclibc-ng.org
Subject: Re: uclibc(1.0.12) mq_send return value and errno issue
Hi Frank,
Frank Liu wrote,
Please see the attached sample code.
If I turn READERS and WRITERS to 0, the test works fine.
Adding another thread in the process by setting a non-zero number to either READERS or
WRITER, the test program crashes due to the assertion at line 99.
I think I found the reason for the problem.
Try attached patch,
best regards
Waldemar
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IMPORTANTPrivileged - Private & Confidential This email and files transmitted with it
are intended solely for the use of the addressee (s) and may contain information which is
confidential or privileged. If you are not the intended recipient, be aware that any
disclosure, copying, distribution or use of this email or any attachment is prohibited. If
you receive this email and you are not the addressee, or you have received this email in
error, please disregard the contents of the email, delete the email and notify the author
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2718
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2725
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3 comments
2 participants
participants (2)
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Frank Liu -
Waldemar Brodkorb