* [Xenomai] [PATCH] posix: Skip auto-shadowing if current thread is already shadowed
@ 2013-06-12 6:15 Jan Kiszka
2013-06-12 11:06 ` Gilles Chanteperdrix
2013-07-26 17:54 ` Jan Kiszka
0 siblings, 2 replies; 6+ messages in thread
From: Jan Kiszka @ 2013-06-12 6:15 UTC (permalink / raw)
To: Gilles Chanteperdrix; +Cc: Xenomai
While the user can also avoid double shadowing by providing the
XENO_NOSHADOW environment variable, there is still no reason to attempt
auto-shadowing in their absence if the current thread is already a
Xenomai thread. This helps, e.g., in complex dlopen scenarios where
the POSIX lib is pulled in belatedly, potentially after some other lib
already shadowed the dlopen caller.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
src/skins/posix/init.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/src/skins/posix/init.c b/src/skins/posix/init.c
index 80725c5..ca1d9e1 100644
--- a/src/skins/posix/init.c
+++ b/src/skins/posix/init.c
@@ -31,6 +31,7 @@
#include <rtdk.h>
#include <asm-generic/xenomai/bind.h>
+#include <asm-generic/xenomai/current.h>
int __pse51_muxid = -1;
int __pse51_rtdm_muxid = -1;
@@ -67,7 +68,7 @@ static __constructor__ void __init_posix_interface(void)
}
noshadow = getenv("XENO_NOSHADOW");
- if (!noshadow || !*noshadow) {
+ if ((!noshadow || !*noshadow) && xeno_get_current() == XN_NO_HANDLE) {
err = __real_pthread_getschedparam(pthread_self(), &policy,
&parm);
if (err) {
--
1.7.3.4
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [Xenomai] [PATCH] posix: Skip auto-shadowing if current thread is already shadowed
2013-06-12 6:15 [Xenomai] [PATCH] posix: Skip auto-shadowing if current thread is already shadowed Jan Kiszka
@ 2013-06-12 11:06 ` Gilles Chanteperdrix
2013-06-13 4:21 ` Jan Kiszka
2013-07-26 17:54 ` Jan Kiszka
1 sibling, 1 reply; 6+ messages in thread
From: Gilles Chanteperdrix @ 2013-06-12 11:06 UTC (permalink / raw)
To: Jan Kiszka; +Cc: Xenomai
On 06/12/2013 08:15 AM, Jan Kiszka wrote:
> While the user can also avoid double shadowing by providing the
> XENO_NOSHADOW environment variable, there is still no reason to attempt
> auto-shadowing in their absence if the current thread is already a
> Xenomai thread. This helps, e.g., in complex dlopen scenarios where
> the POSIX lib is pulled in belatedly, potentially after some other lib
> already shadowed the dlopen caller.
Well, last time I checked, calling __wrap_pthread_setschedparam for an
already shadowed threads was a nop. It usefaults the thread stack
though, maybe we can move the faulting of the tread stack to the
"promoted" case.
--
Gilles.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Xenomai] [PATCH] posix: Skip auto-shadowing if current thread is already shadowed
2013-06-12 11:06 ` Gilles Chanteperdrix
@ 2013-06-13 4:21 ` Jan Kiszka
2013-06-13 4:23 ` Jan Kiszka
0 siblings, 1 reply; 6+ messages in thread
From: Jan Kiszka @ 2013-06-13 4:21 UTC (permalink / raw)
To: Gilles Chanteperdrix; +Cc: Xenomai
On 2013-06-12 13:06, Gilles Chanteperdrix wrote:
> On 06/12/2013 08:15 AM, Jan Kiszka wrote:
>
>> While the user can also avoid double shadowing by providing the
>> XENO_NOSHADOW environment variable, there is still no reason to attempt
>> auto-shadowing in their absence if the current thread is already a
>> Xenomai thread. This helps, e.g., in complex dlopen scenarios where
>> the POSIX lib is pulled in belatedly, potentially after some other lib
>> already shadowed the dlopen caller.
>
>
> Well, last time I checked, calling __wrap_pthread_setschedparam for an
> already shadowed threads was a nop.
I'm getting an EBUSY from xnshadow_map as called by __pthread_shadow.
And that, of course, lets the lib init code bail out.
> It usefaults the thread stack
> though, maybe we can move the faulting of the tread stack to the
> "promoted" case.
Isn't it reasonable to assume that an existing Xenomai thread also
properly went through stack faulting?
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Xenomai] [PATCH] posix: Skip auto-shadowing if current thread is already shadowed
2013-06-13 4:21 ` Jan Kiszka
@ 2013-06-13 4:23 ` Jan Kiszka
0 siblings, 0 replies; 6+ messages in thread
From: Jan Kiszka @ 2013-06-13 4:23 UTC (permalink / raw)
To: Gilles Chanteperdrix; +Cc: Xenomai
On 2013-06-13 06:21, Jan Kiszka wrote:
> On 2013-06-12 13:06, Gilles Chanteperdrix wrote:
>> On 06/12/2013 08:15 AM, Jan Kiszka wrote:
>>
>>> While the user can also avoid double shadowing by providing the
>>> XENO_NOSHADOW environment variable, there is still no reason to attempt
>>> auto-shadowing in their absence if the current thread is already a
>>> Xenomai thread. This helps, e.g., in complex dlopen scenarios where
>>> the POSIX lib is pulled in belatedly, potentially after some other lib
>>> already shadowed the dlopen caller.
>>
>>
>> Well, last time I checked, calling __wrap_pthread_setschedparam for an
>> already shadowed threads was a nop.
>
> I'm getting an EBUSY from xnshadow_map as called by __pthread_shadow.
> And that, of course, lets the lib init code bail out.
BTW, the test pattern is pretty simple:
main()
{
...
rt_task_shadow(&task, "test", 0, 0);
handle = dlopen("libpthread_rt.so", RTLD_LAZY);
...
}
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Xenomai] [PATCH] posix: Skip auto-shadowing if current thread is already shadowed
2013-06-12 6:15 [Xenomai] [PATCH] posix: Skip auto-shadowing if current thread is already shadowed Jan Kiszka
2013-06-12 11:06 ` Gilles Chanteperdrix
@ 2013-07-26 17:54 ` Jan Kiszka
2013-07-26 19:12 ` Gilles Chanteperdrix
1 sibling, 1 reply; 6+ messages in thread
From: Jan Kiszka @ 2013-07-26 17:54 UTC (permalink / raw)
Cc: Xenomai
On 2013-06-12 08:15, Jan Kiszka wrote:
> While the user can also avoid double shadowing by providing the
> XENO_NOSHADOW environment variable, there is still no reason to attempt
> auto-shadowing in their absence if the current thread is already a
> Xenomai thread. This helps, e.g., in complex dlopen scenarios where
> the POSIX lib is pulled in belatedly, potentially after some other lib
> already shadowed the dlopen caller.
>
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> ---
> src/skins/posix/init.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/src/skins/posix/init.c b/src/skins/posix/init.c
> index 80725c5..ca1d9e1 100644
> --- a/src/skins/posix/init.c
> +++ b/src/skins/posix/init.c
> @@ -31,6 +31,7 @@
> #include <rtdk.h>
>
> #include <asm-generic/xenomai/bind.h>
> +#include <asm-generic/xenomai/current.h>
>
> int __pse51_muxid = -1;
> int __pse51_rtdm_muxid = -1;
> @@ -67,7 +68,7 @@ static __constructor__ void __init_posix_interface(void)
> }
>
> noshadow = getenv("XENO_NOSHADOW");
> - if (!noshadow || !*noshadow) {
> + if ((!noshadow || !*noshadow) && xeno_get_current() == XN_NO_HANDLE) {
> err = __real_pthread_getschedparam(pthread_self(), &policy,
> &parm);
> if (err) {
>
Ping for this patch. Any concerns remaining?
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Xenomai] [PATCH] posix: Skip auto-shadowing if current thread is already shadowed
2013-07-26 17:54 ` Jan Kiszka
@ 2013-07-26 19:12 ` Gilles Chanteperdrix
0 siblings, 0 replies; 6+ messages in thread
From: Gilles Chanteperdrix @ 2013-07-26 19:12 UTC (permalink / raw)
To: Jan Kiszka; +Cc: Xenomai
On 07/26/2013 07:54 PM, Jan Kiszka wrote:
> On 2013-06-12 08:15, Jan Kiszka wrote:
>> While the user can also avoid double shadowing by providing the
>> XENO_NOSHADOW environment variable, there is still no reason to attempt
>> auto-shadowing in their absence if the current thread is already a
>> Xenomai thread. This helps, e.g., in complex dlopen scenarios where
>> the POSIX lib is pulled in belatedly, potentially after some other lib
>> already shadowed the dlopen caller.
>>
>> Signed-off-by: Jan Kiszka<jan.kiszka@siemens.com>
>> ---
>> src/skins/posix/init.c | 3 ++-
>> 1 files changed, 2 insertions(+), 1 deletions(-)
>>
>> diff --git a/src/skins/posix/init.c b/src/skins/posix/init.c
>> index 80725c5..ca1d9e1 100644
>> --- a/src/skins/posix/init.c
>> +++ b/src/skins/posix/init.c
>> @@ -31,6 +31,7 @@
>> #include<rtdk.h>
>>
>> #include<asm-generic/xenomai/bind.h>
>> +#include<asm-generic/xenomai/current.h>
>>
>> int __pse51_muxid = -1;
>> int __pse51_rtdm_muxid = -1;
>> @@ -67,7 +68,7 @@ static __constructor__ void __init_posix_interface(void)
>> }
>>
>> noshadow = getenv("XENO_NOSHADOW");
>> - if (!noshadow || !*noshadow) {
>> + if ((!noshadow || !*noshadow)&& xeno_get_current() == XN_NO_HANDLE) {
>> err = __real_pthread_getschedparam(pthread_self(),&policy,
>> &parm);
>> if (err) {
>>
>
> Ping for this patch. Any concerns remaining?
Will merge, thanks for the reminder.
--
Gilles.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2013-07-26 19:12 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2013-06-12 6:15 [Xenomai] [PATCH] posix: Skip auto-shadowing if current thread is already shadowed Jan Kiszka
2013-06-12 11:06 ` Gilles Chanteperdrix
2013-06-13 4:21 ` Jan Kiszka
2013-06-13 4:23 ` Jan Kiszka
2013-07-26 17:54 ` Jan Kiszka
2013-07-26 19:12 ` Gilles Chanteperdrix
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