Gilles Chanteperdrix wrote:
> Landau, Bracha wrote:
> > I'm using xenomai 2.2 rc3 on a MPC8247, on linux 2.6.14.
> >
> > I have a problem using mq_open. Please see the attached code.
> > If I fork before the mq_open the kernel, I get a kernel oops.
> >
> > Why this behaviour?
>
> The child process has not "bound" the interface, so, it has no
> per-process data. If this is the cause of the oops, the solution is to
> add a pthread_atfork call in xeno_user_skin_init in order for the
> process children to also call xeno_user_skin_init.
Actually, this issue is specific to skins using the per-process data
feature, i.e. only the posix skin now. So, here is a fix that only fixes
the posix skin initialization. If it solve your issue I will commit it.
You only have to rebuild the user-space support, kernel-space support is
unchanged.
--
Gilles Chanteperdrix.
Index: src/skins/posix/init.c
===================================================================
--- src/skins/posix/init.c (revision 1357)
+++ src/skins/posix/init.c (working copy)
@@ -30,6 +30,7 @@
int __pse51_muxid = -1;
int __rtdm_muxid = -1;
int __rtdm_fd_start = INT_MAX;
+static int fork_handler_registered;
int __wrap_pthread_setschedparam(pthread_t, int, const struct sched_param *);
@@ -58,9 +59,9 @@
}
parm.sched_priority = 0;
- if ((err =
- __wrap_pthread_setschedparam(pthread_self(), SCHED_OTHER,
- &parm))) {
+ err = __wrap_pthread_setschedparam(pthread_self(), SCHED_OTHER,
+ &parm);
+ if (err) {
fprintf(stderr, "Xenomai Posix skin init: "
"pthread_setschedparam: %s\n", strerror(err));
exit(EXIT_FAILURE);
@@ -70,4 +71,14 @@
perror("Xenomai Posix skin init: munlockall");
exit(EXIT_FAILURE);
}
+
+ if (!fork_handler_registered) {
+ err = pthread_atfork(NULL, NULL, &__init_posix_interface);
+ if (err) {
+ fprintf(stderr, "Xenomai Posix skin init: "
+ "pthread_atfork: %s\n", strerror(err));
+ exit(EXIT_FAILURE);
+ }
+ fork_handler_registered = 1;
+ }
}
Index: src/testsuite/switchtest/Makefile.am
===================================================================
--- src/testsuite/switchtest/Makefile.am (revision 1357)
+++ src/testsuite/switchtest/Makefile.am (working copy)
@@ -9,8 +9,7 @@
switch_LDFLAGS = $(XENO_POSIX_WRAPPERS) $(XENO_USER_LDFLAGS)
switch_LDADD = \
- -lpthread -lrt \
- ../../skins/posix/.libs/libpthread_rt.a
+ ../../skins/posix/.libs/libpthread_rt.a -lpthread -lrt
install-data-local:
$(mkinstalldirs) $(DESTDIR)$(testdir)
Index: src/testsuite/switchtest/Makefile.in
===================================================================
--- src/testsuite/switchtest/Makefile.in (revision 1357)
+++ src/testsuite/switchtest/Makefile.in (working copy)
@@ -1,4 +1,4 @@
-# Makefile.in generated by automake 1.9.6 from Makefile.am.
+# Makefile.in generated by automake 1.9.5 from Makefile.am.
# @configure_input@
# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
@@ -14,6 +14,8 @@
@SET_MAKE@
+SOURCES = $(switch_SOURCES)
+
srcdir = @srcdir@
top_srcdir = @top_srcdir@
VPATH = @srcdir@
@@ -229,8 +231,7 @@
switch_CPPFLAGS = -I$(top_srcdir)/include/posix $(XENO_USER_CFLAGS) -g
-I$(top_srcdir)/include
switch_LDFLAGS = $(XENO_POSIX_WRAPPERS) $(XENO_USER_LDFLAGS)
switch_LDADD = \
- -lpthread -lrt \
- ../../skins/posix/.libs/libpthread_rt.a
+ ../../skins/posix/.libs/libpthread_rt.a -lpthread -lrt
EXTRA_DIST = runinfo
all: all-am
Index: src/testsuite/cyclic/Makefile.am
===================================================================
--- src/testsuite/cyclic/Makefile.am (revision 1357)
+++ src/testsuite/cyclic/Makefile.am (working copy)
@@ -9,8 +9,7 @@
cyclictest_LDFLAGS = $(XENO_POSIX_WRAPPERS) $(XENO_USER_LDFLAGS)
cyclictest_LDADD = \
- -lpthread -lrt \
- ../../skins/posix/.libs/libpthread_rt.a
+ ../../skins/posix/.libs/libpthread_rt.a -lpthread -lrt
install-data-local:
$(mkinstalldirs) $(DESTDIR)$(testdir)
Index: src/testsuite/cyclic/Makefile.in
===================================================================
--- src/testsuite/cyclic/Makefile.in (revision 1357)
+++ src/testsuite/cyclic/Makefile.in (working copy)
@@ -1,4 +1,4 @@
-# Makefile.in generated by automake 1.9.6 from Makefile.am.
+# Makefile.in generated by automake 1.9.5 from Makefile.am.
# @configure_input@
# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
@@ -14,6 +14,8 @@
@SET_MAKE@
+SOURCES = $(cyclictest_SOURCES)
+
srcdir = @srcdir@
top_srcdir = @top_srcdir@
VPATH = @srcdir@
@@ -229,8 +231,7 @@
cyclictest_CPPFLAGS = -I$(top_srcdir)/include/posix $(XENO_USER_CFLAGS)
-DIPIPE_TRACE=1 -I$(top_srcdir)/include
cyclictest_LDFLAGS = $(XENO_POSIX_WRAPPERS) $(XENO_USER_LDFLAGS)
cyclictest_LDADD = \
- -lpthread -lrt \
- ../../skins/posix/.libs/libpthread_rt.a
+ ../../skins/posix/.libs/libpthread_rt.a -lpthread -lrt
EXTRA_DIST = runinfo
all: all-am
Index: src/testsuite/irqbench/Makefile.am
===================================================================
--- src/testsuite/irqbench/Makefile.am (revision 1357)
+++ src/testsuite/irqbench/Makefile.am (working copy)
@@ -19,8 +19,7 @@
$(XENO_USER_LDFLAGS)
irqloop_LDADD = \
- -lpthread \
- ../../skins/posix/.libs/libpthread_rt.a
+ ../../skins/posix/.libs/libpthread_rt.a -lpthread
irqbench_SOURCES = irqbench.c
Index: src/testsuite/irqbench/Makefile.in
===================================================================
--- src/testsuite/irqbench/Makefile.in (revision 1357)
+++ src/testsuite/irqbench/Makefile.in (working copy)
@@ -1,4 +1,4 @@
-# Makefile.in generated by automake 1.9.6 from Makefile.am.
+# Makefile.in generated by automake 1.9.5 from Makefile.am.
# @configure_input@
# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
@@ -14,6 +14,8 @@
@SET_MAKE@
+SOURCES = $(irqbench_SOURCES) $(irqloop_SOURCES)
+
srcdir = @srcdir@
top_srcdir = @top_srcdir@
VPATH = @srcdir@
@@ -241,8 +243,7 @@
$(XENO_USER_LDFLAGS)
irqloop_LDADD = \
- -lpthread \
- ../../skins/posix/.libs/libpthread_rt.a
+ ../../skins/posix/.libs/libpthread_rt.a -lpthread
irqbench_SOURCES = irqbench.c
irqbench_CPPFLAGS = \
_______________________________________________
Xenomai-help mailing list
[email protected]
https://mail.gna.org/listinfo/xenomai-help
