* [PATCH] Self-contained pthread_spinlock_t for RTEMS
@ 2016-11-24 10:04 Sebastian Huber
2016-11-24 15:59 ` Corinna Vinschen
0 siblings, 1 reply; 2+ messages in thread
From: Sebastian Huber @ 2016-11-24 10:04 UTC (permalink / raw)
To: newlib; +Cc: Sebastian Huber
Turn pthread_spinlock_t into a self-contained object. On uni-processor
configurations, interrupts are disabled in the lock/trylock operations
and the previous interrupt status is restored in the corresponding
unlock operations. On SMP configurations, a ticket lock is a acquired
and released in addition.
See also:
https://devel.rtems.org/ticket/2674
This implementation is simple and efficient. However, this test case of
the Linux Test Project would fail due to call of printf() and sleep()
during spin lock ownership:
https://github.com/linux-test-project/ltp/blob/master/testcases/open_posix_testsuite/conformance/interfaces/pthread_spin_lock/1-2.c
Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>
---
newlib/libc/sys/rtems/include/sys/_pthreadtypes.h | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/newlib/libc/sys/rtems/include/sys/_pthreadtypes.h b/newlib/libc/sys/rtems/include/sys/_pthreadtypes.h
index e1a88e9..bd66c68 100644
--- a/newlib/libc/sys/rtems/include/sys/_pthreadtypes.h
+++ b/newlib/libc/sys/rtems/include/sys/_pthreadtypes.h
@@ -22,6 +22,7 @@
#include <sys/sched.h>
#include <sys/cpuset.h>
+#include <sys/lock.h>
/*
* 2.5 Primitive System Data Types, P1003.1c/D10, p. 19.
@@ -190,7 +191,10 @@ typedef struct {
/* POSIX Spin Lock Types */
#if defined(_POSIX_SPIN_LOCKS)
-typedef __uint32_t pthread_spinlock_t; /* POSIX Spin Lock Object */
+typedef struct {
+ struct _Ticket_lock_Control _Lock;
+ __uint32_t _interrupt_state;
+} pthread_spinlock_t; /* POSIX Spin Lock Object */
#endif /* defined(_POSIX_SPIN_LOCKS) */
/* POSIX Reader/Writer Lock Types */
--
1.8.4.5
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] Self-contained pthread_spinlock_t for RTEMS
2016-11-24 10:04 [PATCH] Self-contained pthread_spinlock_t for RTEMS Sebastian Huber
@ 2016-11-24 15:59 ` Corinna Vinschen
0 siblings, 0 replies; 2+ messages in thread
From: Corinna Vinschen @ 2016-11-24 15:59 UTC (permalink / raw)
To: newlib
[-- Attachment #1: Type: text/plain, Size: 839 bytes --]
On Nov 24 10:58, Sebastian Huber wrote:
> Turn pthread_spinlock_t into a self-contained object. On uni-processor
> configurations, interrupts are disabled in the lock/trylock operations
> and the previous interrupt status is restored in the corresponding
> unlock operations. On SMP configurations, a ticket lock is a acquired
> and released in addition.
>
> See also:
>
> https://devel.rtems.org/ticket/2674
>
> This implementation is simple and efficient. However, this test case of
> the Linux Test Project would fail due to call of printf() and sleep()
> during spin lock ownership:
>
> https://github.com/linux-test-project/ltp/blob/master/testcases/open_posix_testsuite/conformance/interfaces/pthread_spin_lock/1-2.c
Patch applied.
Thanks,
Corinna
--
Corinna Vinschen
Cygwin Maintainer
Red Hat
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