18 Nov
2016
18 Nov
'16
6:45 a.m.
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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