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authorUlrich Drepper <drepper@redhat.com>2000-07-27 22:01:07 +0000
committerUlrich Drepper <drepper@redhat.com>2000-07-27 22:01:07 +0000
commit37d33038d0986abffa6a14895ba7ae36413c7868 (patch)
treed9cf5e96666b3d1ba27c6d329fe48de2c9078834 /linuxthreads/sysdeps
parentbaec5641ed9a1551982f5250c8335fe3cdf32c62 (diff)
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Update.
2000-07-27 Jes Sorensen <jes@linuxcare.com> * sysdeps/unix/sysv/linux/ia64/fork.c: Make __libc_fork the strong name and add weak alias for __fork. * sysdeps/unix/sysv/linux/ia64/syscalls.list: Change llseek, pread & pwrite to use __libc_<name> as strong names instead of __syscall_<name>. * include/sched.h: Add clone2 prototype. 2000-07-26 Jes Sorensen <jes@linuxcare.com> * sysdeps/unix/sysv/linux/ia64/sysdep.h (ENTRY): Don't declare the procedure name twice. 2000-07-27 Philip Blundell <philb@gnu.org> * malloc/malloc.c (HAVE_MREMAP): Undo change of 1997-12-04.
Diffstat (limited to 'linuxthreads/sysdeps')
-rw-r--r--linuxthreads/sysdeps/ia64/pspinlock.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/linuxthreads/sysdeps/ia64/pspinlock.c b/linuxthreads/sysdeps/ia64/pspinlock.c
new file mode 100644
index 0000000..ada28bd
--- /dev/null
+++ b/linuxthreads/sysdeps/ia64/pspinlock.c
@@ -0,0 +1,93 @@
+/* POSIX spinlock implementation. ia64 version.
+ Copyright (C) 2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Jes Sorensen <jes@linuxcare.com>
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <errno.h>
+#include <pthread.h>
+
+
+/* This implementation is inspired by the implementation used in the
+ Linux kernel. */
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+ asm volatile
+ ("mov ar.ccv = r0\n\t"
+ "mov r3 = 1\n\t"
+ ";;\n"
+ "1:\n\t"
+ "ld4 r2 = %0\n\t"
+ ";;\n\t"
+ "cmp4.eq p0, p7 = r0, r2\n\t"
+ "(p7) br.cond.spnt.few 1b \n\t"
+ "cmpxchg4.acq r2 = %0, r3, ar.ccv\n\t"
+ ";;\n\t"
+ "cmp4.eq p0, p7 = r0, r2\n\t"
+ "(p7) br.cond.spnt.few 1b\n\t"
+ ";;\n"
+ :: "m" (lock) : "r2", "r3", "p7", "memory");
+ return 0;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+ int oldval;
+
+ asm volatile
+ ("mov ar.ccv = r0\n\t"
+ "mov r2 = 1\n\t"
+ ";;\n\t"
+ "cmpxchg4.acq %0 = %1, r2, ar.ccv\n\t"
+ ";;\n"
+ : "=r" (oldval) : "m" (lock) : "r2", "memory");
+ return oldval > 0 ? 0 : EBUSY;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+ return *lock = 0;
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+ /* We can ignore the `pshared' parameter. Since we are busy-waiting
+ all processes which can access the memory location `lock' points
+ to can use the spinlock. */
+ return *lock = 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+ /* Nothing to do. */
+ return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)