^Z followed by fg in bash causes failure with certain linux versions

[Jeff Hill]

Yevgeny A. Gusev has observed that EPICS code exhibits the following failure related diagnostic when running on an earlier version of Linux and a ^Z followed by "fg" is issued at the bash command line by the user.

pthread_cond_timedwait failed: error Interrupted system call
epicsThread: Unknown C++ exception - terminating thread "timerQueue"

Original Mantis Bug: mantis-96
    http://www.aps.anl.gov/epics/mantis/view_bug_page.php?f_id=96

[Jeff Hill (johill-lanl)]

I am unable to reproduce this on my version of Linux (see my experience below). I am going to guess that this is a Linux kernel specific issue. Nevertheless, I am starting to suspect that we could avoid this issue by restarting the pthread_cond_timedwait system call if the errorno indicates that the system call was interrupted?

~/epicsR3.14/epics/appl/caApp/O.linux-x86$ uname -a
Linux quax.ta53.lanl.gov 2.4.20-8 #1 Thu Mar 13 17:54:28 EST 2003 i686 i686 i386 GNU/Linux

~/epicsR3.14/epics/appl/caApp/O.linux-x86$ ./catest joh:fred
./catest: connection handler for "joh:fred": CONNECTED
./catest: event handler called for "joh:fred"
./catest: event handler called for "joh:fred"
./catest: event handler called for "joh:fred"

[1]+ Stopped ./catest joh:fred
~/epicsR3.14/epics/appl/caApp/O.linux-x86$ fg
./catest joh:fred
./catest: event handler called for "joh:fred"
./catest: event handler called for "joh:fred"
./catest: event handler called for "joh:fred"
./catest: event handler called for "joh:fred"
./catest: event handler called for "joh:fred"
./catest: event handler called for "joh:fred"

[Andrew Johnson (anj)]

No feedback in 3 months, and we've reworked the EPICS signal handling since then so we think the problem should have been resolved in R3.14.7.

[Andrew Johnson (anj)]

R3.14.7 Released