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Problem Report 1048 Details
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Problem Report Number 1048 Submitter's Classification Minor System Fault State Resolved Resolution Minor System Fault (MSF) Problem Resolution ID MSF.X.0038 Raised 1970-01-01 08:00 Updated 2003-03-13 08:00 Published 1998-07-06 08:00 Expiry Date 1999-07-06 Product Standard Internationalised System Calls and Libraries Extended V2 (UNIX 98) Certification Program The Open Brand certification program Test Suite VSRT version 5.0.1 Test Identification rt.os/procprim/sigwait 2 Problem Summary MSF4R.00002 An MSF is requested as the implementation may not select signals in priority order and signals may not be delivered (signal handlers not run) in priority order in a POSIX threads Realtime application Problem Text
This request is for the following test failures:
rt.os/procprim/sigwait/T.sigwait 2
rt.os/rtsignals/sigtimedwait/T.sigtimedwait 5
rt.os/rtsignals/sigwaitinfo/T.sigwaitinfo 5
rt.os/procprim/sigaction/T.sigaction 3
rt.os/procprim/sigaction/T.sigaction 5
The XSH5 specification states that when multiple realtime signals are
pending, sigwait(), sigwaitinfo() and sigtimedwait() shall select the
signal in priority order, with SIGRTMIN having the highest priority
and SIGRTMAX the lowest. The same applies when the realtime signals are
delivered (disposition for realtime signals is to catch, signal handlers
are installed), that is, they shall be delivered in priority order.
We are seeking a MSF for a recognized bug in our implementation whereby
with multiple real time signals pending, the maximum of _POSIX_SIGQUEUE_MAX
(32 for the implementation) instances, sigwait(), sigwaitinfo(), and
sigtimedwait() may not select the signals in priority order and signals
may not be delivered (signal handlers are not run) in priority order in a
POSIX threads Realtime application.
The impact on applications is that they can not depend on the value
_POSIX_SIGQUEUE_MAX. The priority order for selection or delivery of
pending signals is currently supported for a POSIX threads Realtime
application as long as the queue depth is not greater than one.
Priority order is supported when a single instance of any realtime
signal is pending.
As this request was initially refused we are also putting forward
the following in support of our case.
Clarifying the text of the original waiver request, the purpose of the
VSRT test suite is to test realtime functionality. Were it only testing
realtime functionality of sigwait, sigtimedwait, sigwaitinfo, and
sigaction (i.e. linking with -lrt only) as opposed to threaded realtime
functionality (i.e. linking with both -lrt and -lpthread), this test
would pass. In summary:
1. The problem is not present and will not affect applications that
only link with -lrt (real time library).
2. The problem is not present and will not affect applications that
only link with -lpthread (threads library).
3. Only applications that link with both -lrt and -lpthread MAY be
affected, in other words, threaded realtime applications.
4. Our customers have been using our realtime and threads functionality
for over a year and in that time have not raised this as an issue or
bug. The only application where this problem has become visible that
we are aware of is the test suite.Test Output
********************************************************************
/tset/rt.os/procprim/sigwait/T.sigwait 2 Failed
Test Description:
If _POSIX_REALTIME_SIGNALS is defined:
If a call to sigwait() selects any of the multiple pending signals
in the range SIGRTMIN to SIGRTMAX it shall be the lowest numbered
one.
Test Information:
Expected sig for signal 1 = 38, is 45
Expected sig for signal 3 = 38, is 45
Expected sig for signal 5 = 38, is 45
Expected sig for signal 7 = 38, is 45
Expected sig for signal 9 = 38, is 45
Expected sig for signal 11 = 38, is 45
Expected sig for signal 13 = 38, is 45
Expected sig for signal 15 = 38, is 45
Expected sig for signal 16 = 45, is 38
Expected sig for signal 18 = 45, is 38
Expected sig for signal 20 = 45, is 38
Expected sig for signal 22 = 45, is 38
Expected sig for signal 24 = 45, is 38
Expected sig for signal 26 = 45, is 38
Expected sig for signal 28 = 45, is 38
Expected sig for signal 30 = 45, is 38
********************************************************************
********************************************************************
/tset/rt.os/rtsignals/sigtimedwait/T.sigtimedwait 5 Failed
Test Description:
If _POSIX_REALTIME_SIGNALS is defined or the implementation supports
the sigtimedwait() function as described in System Interfaces and
Headers, Issue 5:
Should any of the multiple pending signals in the range SIGRTMIN to
SIGRTMAX be selected by a call to sigtimedwait() it shall be the
lowest numbered one.
Test Information:
Expected si_signo for signal 1 = 38, is 45
si_value for signal 1 = 16, maximum expected value is 15
Expected si_signo for signal 3 = 38, is 45
si_value for signal 3 = 17, maximum expected value is 15
Expected si_signo for signal 5 = 38, is 45
si_value for signal 5 = 18, maximum expected value is 15
Expected si_signo for signal 7 = 38, is 45
si_value for signal 7 = 19, maximum expected value is 15
Expected si_signo for signal 9 = 38, is 45
si_value for signal 9 = 20, maximum expected value is 15
Expected si_signo for signal 11 = 38, is 45
si_value for signal 11 = 21, maximum expected value is 15
Expected si_signo for signal 13 = 38, is 45
si_value for signal 13 = 22, maximum expected value is 15
Expected si_signo for signal 15 = 38, is 45
si_value for signal 15 = 23, maximum expected value is 15
Signal 8 not received
Signal 9 not received
Signal 10 not received
Signal 11 not received
Signal 12 not received
Signal 13 not received
Signal 14 not received
Signal 15 not received
Expected si_signo for signal 16 = 45, is 38
si_value for signal 16 = 8, expected value between 16 and 31
Expected si_signo for signal 18 = 45, is 38
si_value for signal 18 = 9, expected value between 16 and 31
Expected si_signo for signal 20 = 45, is 38
si_value for signal 20 = 10, expected value between 16 and 31
Expected si_signo for signal 21 = 45, is 38
si_value for signal 21 = 11, expected value between 16 and 31
Expected si_signo for signal 22 = 45, is 38
si_value for signal 22 = 12, expected value between 16 and 31
Expected si_signo for signal 23 = 45, is 38
si_value for signal 23 = 13, expected value between 16 and 31
Expected si_signo for signal 24 = 45, is 38
si_value for signal 24 = 14, expected value between 16 and 31
Expected si_signo for signal 25 = 45, is 38
si_value for signal 25 = 15, expected value between 16 and 31
Signal 16 not received
Signal 17 not received
Signal 18 not received
Signal 19 not received
Signal 20 not received
Signal 21 not received
Signal 22 not received
Signal 23 not received
********************************************************************
********************************************************************
/tset/rt.os/rtsignals/sigwaitinfo/T.sigwaitinfo 5 Failed
Test Description:
If _POSIX_REALTIME_SIGNALS is defined or the implementation supports
the sigwaitinfo() function as described in System Interfaces and
Headers, Issue 5:
Should any of the multiple pending signals in the range SIGRTMIN to
SIGRTMAX be selected by a call to sigwaitinfo() it shall be the
lowest numbered one.
Test Information:
Expected si_signo for signal 1 = 38, is 45
si_value for signal 1 = 16, maximum expected value is 15
Expected si_signo for signal 3 = 38, is 45
si_value for signal 3 = 17, maximum expected value is 15
Expected si_signo for signal 5 = 38, is 45
si_value for signal 5 = 18, maximum expected value is 15
Expected si_signo for signal 7 = 38, is 45
si_value for signal 7 = 19, maximum expected value is 15
Expected si_signo for signal 9 = 38, is 45
si_value for signal 9 = 20, maximum expected value is 15
Expected si_signo for signal 11 = 38, is 45
si_value for signal 11 = 21, maximum expected value is 15
Expected si_signo for signal 13 = 38, is 45
si_value for signal 13 = 22, maximum expected value is 15
Expected si_signo for signal 15 = 38, is 45
si_value for signal 15 = 23, maximum expected value is 15
Signal 8 not received
Signal 9 not received
Signal 10 not received
Signal 11 not received
Signal 12 not received
Signal 13 not received
Signal 14 not received
Signal 15 not received
Expected si_signo for signal 16 = 45, is 38
si_value for signal 16 = 8, expected value between 16 and 31
Expected si_signo for signal 18 = 45, is 38
si_value for signal 18 = 9, expected value between 16 and 31
Expected si_signo for signal 20 = 45, is 38
si_value for signal 20 = 10, expected value between 16 and 31
Expected si_signo for signal 22 = 45, is 38
si_value for signal 22 = 11, expected value between 16 and 31
Expected si_signo for signal 23 = 45, is 38
si_value for signal 23 = 12, expected value between 16 and 31
Expected si_signo for signal 24 = 45, is 38
si_value for signal 24 = 13, expected value between 16 and 31
Expected si_signo for signal 25 = 45, is 38
si_value for signal 25 = 14, expected value between 16 and 31
Expected si_signo for signal 26 = 45, is 38
si_value for signal 26 = 15, expected value between 16 and 31
Signal 16 not received
Signal 17 not received
Signal 18 not received
Signal 19 not received
Signal 20 not received
Signal 21 not received
Signal 22 not received
Signal 23 not received
********************************************************************
********************************************************************
/tset/rt.os/procprim/sigaction/T.sigaction 3 Failed
Test Description:
If _POSIX_REALTIME_SIGNALS is defined:
When multiple unblocked signals all in the range SIGRTMIN to
SIGRTMAX are pending the implementation shall deliver the pending
unblocked signal with the lowest number within that range.
Test Information:
Expected si_signo for signal 1 = 38, is 45
si_value for signal 1 = 16, maximum expected value is 15
Expected si_signo for signal 3 = 38, is 45
si_value for signal 3 = 17, maximum expected value is 15
Expected si_signo for signal 5 = 38, is 45
si_value for signal 5 = 18, maximum expected value is 15
Expected si_signo for signal 7 = 38, is 45
si_value for signal 7 = 19, maximum expected value is 15
Expected si_signo for signal 9 = 38, is 45
si_value for signal 9 = 20, maximum expected value is 15
Expected si_signo for signal 11 = 38, is 45
si_value for signal 11 = 21, maximum expected value is 15
Expected si_signo for signal 13 = 38, is 45
si_value for signal 13 = 22, maximum expected value is 15
Expected si_signo for signal 15 = 38, is 45
si_value for signal 15 = 23, maximum expected value is 15
Signal 8 not received
Signal 9 not received
Signal 10 not received
Signal 11 not received
Signal 12 not received
Signal 13 not received
Signal 14 not received
Signal 15 not received
Expected si_signo for signal 16 = 45, is 38
si_value for signal 16 = 8, expected value is between 16 and 31
Expected si_signo for signal 18 = 45, is 38
si_value for signal 18 = 9, expected value is between 16 and 31
Expected si_signo for signal 20 = 45, is 38
si_value for signal 20 = 10, expected value is between 16 and 31
Expected si_signo for signal 22 = 45, is 38
si_value for signal 22 = 11, expected value is between 16 and 31
Expected si_signo for signal 23 = 45, is 38
si_value for signal 23 = 12, expected value is between 16 and 31
Expected si_signo for signal 24 = 45, is 38
si_value for signal 24 = 13, expected value is between 16 and 31
Expected si_signo for signal 25 = 45, is 38
si_value for signal 25 = 14, expected value is between 16 and 31
Expected si_signo for signal 26 = 45, is 38
si_value for signal 26 = 15, expected value is between 16 and 31
Signal 16 not received
Signal 17 not received
Signal 18 not received
Signal 19 not received
Signal 20 not received
Signal 21 not received
Signal 22 not received
Signal 23 not received
*******************************************************************
********************************************************************
/tset/rt.os/procprim/sigaction/T.sigaction 5 Failed
Test Description:
If _POSIX_REALTIME_SIGNALS is defined:
Realtime signal behavior shall be provided for all signals in the
range SIGRTMIN to SIGRTMAX.
Test Information:
Signal 8 - received signal 38, but last signal was 45 and lowest
numbered should be delivered first
********************************************************************
Review Information
Review Type TSMA Review Start Date null Completed null Status Complete Review Recommendation No Resolution Given Review Response
We recommend this request be denied.
The impact of this fault on the behavior of conforming applications
using these APIs seems to us to be too significant to classify it as
a minor fault.
Review Type SA Review Start Date null Completed null Status Complete Review Resolution No Resolution Given Review Conclusion
Initially we refused this request as PG4R.00013, on considering the
additional rationale inserted above and discussing it with the
consultant, we now feel that a Temporary Waiver is possible.
Review Type SA Review Start Date null Completed null Status Complete Review Resolution Minor System Fault (MSF) Review Conclusion
A Temporary Waiver is granted.
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