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[PATCH 2/2] S390: Use generic spinlock code.
- From: Stefan Liebler <stli at linux dot vnet dot ibm dot com>
- To: libc-alpha at sourceware dot org
- Cc: Stefan Liebler <stli at linux dot vnet dot ibm dot com>
- Date: Fri, 16 Dec 2016 17:31:57 +0100
- Subject: [PATCH 2/2] S390: Use generic spinlock code.
- Authentication-results: sourceware.org; auth=none
- References: <1481905917-15654-1-git-send-email-stli@linux.vnet.ibm.com>
This patch removes the s390 specific implementation of spinlock code
and is now using the generic one.
For pthread_spin_trylock an explicit load and test before executing
compare and swap instruction is done as it is an interlock update even
if the lock is already acquired.
ChangeLog:
* sysdeps/s390/nptl/pthread_spin_init.c: Delete File.
* sysdeps/s390/nptl/pthread_spin_unlock.c: Likewise.
* sysdeps/s390/nptl/pthread_spin_lock.c:
(SPIN_LOCK_READS_BETWEEN_CMPXCHG): New define.
Use generic spinlock code.
* sysdeps/s390/nptl/pthread_spin_trylock.c:
(SPIN_TRYLOCK_USE_CMPXCHG_INSTEAD_OF_XCHG): New define.
Use generic spinlock code.
---
sysdeps/s390/nptl/pthread_spin_init.c | 19 -------------------
sysdeps/s390/nptl/pthread_spin_lock.c | 18 +++++-------------
sysdeps/s390/nptl/pthread_spin_trylock.c | 18 +++++-------------
sysdeps/s390/nptl/pthread_spin_unlock.c | 32 --------------------------------
4 files changed, 10 insertions(+), 77 deletions(-)
delete mode 100644 sysdeps/s390/nptl/pthread_spin_init.c
delete mode 100644 sysdeps/s390/nptl/pthread_spin_unlock.c
diff --git a/sysdeps/s390/nptl/pthread_spin_init.c b/sysdeps/s390/nptl/pthread_spin_init.c
deleted file mode 100644
index 7d3568f..0000000
--- a/sysdeps/s390/nptl/pthread_spin_init.c
+++ /dev/null
@@ -1,19 +0,0 @@
-/* Copyright (C) 2003-2016 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-/* Not needed. pthread_spin_init is an alias for pthread_spin_unlock. */
diff --git a/sysdeps/s390/nptl/pthread_spin_lock.c b/sysdeps/s390/nptl/pthread_spin_lock.c
index def6a24..d99cd81 100644
--- a/sysdeps/s390/nptl/pthread_spin_lock.c
+++ b/sysdeps/s390/nptl/pthread_spin_lock.c
@@ -16,17 +16,9 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#include "pthreadP.h"
+#define SPIN_LOCK_READS_BETWEEN_CMPXCHG 1000
-int
-pthread_spin_lock (pthread_spinlock_t *lock)
-{
- int oldval;
-
- __asm__ __volatile__ ("0: lhi %0,0\n"
- " cs %0,%2,%1\n"
- " jl 0b"
- : "=&d" (oldval), "=Q" (*lock)
- : "d" (1), "m" (*lock) : "cc" );
- return 0;
-}
+/* We can't use the normal "#include <nptl/pthread_spin_lock.c>" because
+ it will resolve to this very file. Using "sysdeps/.." as reference to the
+ top level directory does the job. */
+#include <sysdeps/../nptl/pthread_spin_lock.c>
diff --git a/sysdeps/s390/nptl/pthread_spin_trylock.c b/sysdeps/s390/nptl/pthread_spin_trylock.c
index 4c00e08..d7a2089 100644
--- a/sysdeps/s390/nptl/pthread_spin_trylock.c
+++ b/sysdeps/s390/nptl/pthread_spin_trylock.c
@@ -16,17 +16,9 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#include <errno.h>
-#include "pthreadP.h"
+#define SPIN_TRYLOCK_USE_CMPXCHG_INSTEAD_OF_XCHG 1
-int
-pthread_spin_trylock (pthread_spinlock_t *lock)
-{
- int old;
-
- __asm__ __volatile__ ("cs %0,%3,%1"
- : "=d" (old), "=Q" (*lock)
- : "0" (0), "d" (1), "m" (*lock) : "cc" );
-
- return old != 0 ? EBUSY : 0;
-}
+/* We can't use the normal "#include <nptl/pthread_spin_trylock.c>" because
+ it will resolve to this very file. Using "sysdeps/.." as reference to the
+ top level directory does the job. */
+#include <sysdeps/../nptl/pthread_spin_trylock.c>
diff --git a/sysdeps/s390/nptl/pthread_spin_unlock.c b/sysdeps/s390/nptl/pthread_spin_unlock.c
deleted file mode 100644
index 0dcc2d0..0000000
--- a/sysdeps/s390/nptl/pthread_spin_unlock.c
+++ /dev/null
@@ -1,32 +0,0 @@
-/* Copyright (C) 2003-2016 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-/* Ugly hack to avoid the declaration of pthread_spin_init. */
-#define pthread_spin_init pthread_spin_init_XXX
-#include "pthreadP.h"
-#undef pthread_spin_init
-
-int
-pthread_spin_unlock (pthread_spinlock_t *lock)
-{
- __asm__ __volatile__ (" xc %O0(4,%R0),%0\n"
- " bcr 15,0"
- : "=Q" (*lock) : "m" (*lock) : "cc" );
- return 0;
-}
-strong_alias (pthread_spin_unlock, pthread_spin_init)
--
2.3.0