Low level lock definitions for nptl on Alpha.

1 files changed, 218 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/alpha/nptl/lowlevellock.h b/sysdeps/unix/sysv/linux/alpha/nptl/lowlevellock.h
new file mode 100644
index 0000000000..e286ef36cb
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/nptl/lowlevellock.h
@@ -0,0 +1,218 @@
+/* Copyright (C) 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 Libr	\ary; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _LOWLEVELLOCK_H
+#define _LOWLEVELLOCK_H	1
+
+#include <time.h>
+#include <sys/param.h>
+#include <bits/pthreadtypes.h>
+#include <atomic.h>
+
+
+#define __NR_futex		394
+#define FUTEX_WAIT		0
+#define FUTEX_WAKE		1
+#define FUTEX_REQUEUE		3
+
+/* Initializer for compatibility lock.	*/
+#define LLL_MUTEX_LOCK_INITIALIZER (0)
+
+#define lll_futex_wait(futexp, val) \
+  ({									      \
+    INTERNAL_SYSCALL_DECL (__err);					      \
+    long int __ret;							      \
+    __ret = INTERNAL_SYSCALL (futex, __err, 4,				      \
+			      (futexp), FUTEX_WAIT, (val), 0);		      \
+    INTERNAL_SYSCALL_ERROR_P (__ret, __err)? -__ret: 0;			      \
+  })
+
+#define lll_futex_timed_wait(futexp, val, timespec) \
+  ({									      \
+    INTERNAL_SYSCALL_DECL (__err);					      \
+    long int __ret;							      \
+    __ret = INTERNAL_SYSCALL (futex, __err, 4,				      \
+			      (futexp), FUTEX_WAIT, (val), (timespec));	      \
+    INTERNAL_SYSCALL_ERROR_P (__ret, __err)? -__ret: 0;			      \
+  })
+
+#define lll_futex_wake(futexp, nr) \
+  ({									      \
+    INTERNAL_SYSCALL_DECL (__err);					      \
+    long int __ret;							      \
+    __ret = INTERNAL_SYSCALL (futex, __err, 4,				      \
+			      (futexp), FUTEX_WAKE, (nr), 0);		      \
+    INTERNAL_SYSCALL_ERROR_P (__ret, __err)? -__ret: 0;			      \
+  })
+
+#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex) \
+  ({									      \
+    INTERNAL_SYSCALL_DECL (__err);					      \
+    long int __ret;							      \
+									      \
+    __ret = INTERNAL_SYSCALL (futex, __err, 5,				      \
+			      (futexp), FUTEX_REQUEUE, (nr_wake), (nr_move),  \
+			      (mutex));					      \
+    INTERNAL_SYSCALL_ERROR_P (__ret, __err)? -__ret: 0;			      \
+  })
+
+/* Set *futex to 1 if it is 0, atomically.  Returns the old value */
+#define __lll_trylock(futex) \
+  ({ int __oldval, __temp;						\
+     __asm __volatile (							\
+	"1:	ldl_l	%[__oldval], %[__mem]\n"			\
+	"	lda	%[__temp], 1\n"					\
+	"	bne	%[__oldval], 2f\n"				\
+	"	stl_c	%[__temp], %[__mem]\n"				\
+	"	beq	%[__temp], 1b\n"				\
+		__MB							\
+	"2:"								\
+	: [__oldval] "=&r" (__oldval),					\
+	  [__temp] "=&r" (__temp)					\
+	: [__mem] "m" (*(futex))					\
+	: "memory");				     			\
+     __oldval;								\
+  })
+
+#define lll_mutex_trylock(lock)	__lll_trylock (&(lock))
+
+
+extern void __lll_lock_wait (int *futex, int val) attribute_hidden;
+
+#define lll_mutex_lock(lock) \
+  (void) ({								\
+    int *__futex = &(lock);						\
+    int __val = atomic_exchange_and_add (__futex, 1);			\
+    atomic_full_barrier();						\
+    if (__builtin_expect (__val != 0, 0))				\
+      __lll_lock_wait (__futex, __val);					\
+  })
+
+#define lll_mutex_cond_lock(lock) \
+  (void) ({								\
+    int *__futex = &(lock);						\
+    int __val = atomic_exchange_and_add (__futex, 2);			\
+    atomic_full_barrier();						\
+    if (__builtin_expect (__val != 0, 0))				\
+      /* Note, the val + 1 is kind of ugly here.  __lll_lock_wait will	\
+	 add 1 again.  But we added 2 to the futex value so this is the	\
+	 right value which will be passed to the kernel.  */		\
+      __lll_lock_wait (__futex, __val + 1);				\
+  })
+
+extern int __lll_timedlock_wait
+	(int *futex, int val, const struct timespec *) attribute_hidden;
+
+#define lll_mutex_timedlock(lock, abstime) \
+  ({ int *__futex = &(lock);						\
+     int __val = atomic_exchange_and_add (__futex, 1);			\
+     atomic_full_barrier();						\
+     if (__builtin_expect (__val != 0, 0))				\
+       __val = __lll_timedlock_wait (__futex, __val, (abstime));	\
+     __val;								\
+  })
+
+#define lll_mutex_unlock(lock) \
+  ((void) ({								\
+    int *__futex = &(lock), __val;					\
+    atomic_write_barrier();						\
+    __val = atomic_exchange_rel (__futex, 0);				\
+    if (__builtin_expect (__val > 1, 0))				\
+      lll_futex_wake (__futex, 1);					\
+  }))
+
+#define lll_mutex_unlock_force(lock) \
+  ((void) ({								\
+    int *__futex = &(lock);						\
+    atomic_write_barrier();						\
+    *__futex = 0;							\
+    atomic_full_barrier();						\
+    lll_futex_wake (__futex, 1);					\
+  }))
+
+#define lll_mutex_islocked(futex) \
+  (futex != 0)
+
+
+/* Our internal lock implementation is identical to the binary-compatible
+   mutex implementation. */
+
+/* Type for lock object.  */
+typedef int lll_lock_t;
+
+/* Initializers for lock.  */
+#define LLL_LOCK_INITIALIZER		(0)
+#define LLL_LOCK_INITIALIZER_LOCKED	(1)
+
+extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
+
+/* The states of a lock are:
+    0  -  untaken
+    1  -  taken by one user
+   >1  -  taken by more users */
+
+#define lll_trylock(lock)	lll_mutex_trylock (lock)
+#define lll_lock(lock)		lll_mutex_lock (lock)
+#define lll_unlock(lock)	lll_mutex_unlock (lock)
+#define lll_islocked(lock)	lll_mutex_islocked (lock)
+
+/* The kernel notifies a process which uses CLONE_CLEARTID via futex
+   wakeup when the clone terminates.  The memory location contains the
+   thread ID while the clone is running and is reset to zero
+   afterwards.	*/
+#define lll_wait_tid(tid) \
+  do {									      \
+    __typeof (tid) __tid;						      \
+    while ((__tid = (tid)) != 0)					      \
+      lll_futex_wait (&(tid), __tid);					      \
+  } while (0)
+
+extern int __lll_timedwait_tid (int *, const struct timespec *)
+     attribute_hidden;
+
+#define lll_timedwait_tid(tid, abstime) \
+  ({									      \
+    int __res = 0;							      \
+    if ((tid) != 0)							      \
+      __res = __lll_timedwait_tid (&(tid), (abstime));			      \
+    __res;								      \
+  })
+
+
+/* Conditional variable handling.  */
+
+extern void __lll_cond_wait (pthread_cond_t *cond)
+     attribute_hidden;
+extern int __lll_cond_timedwait (pthread_cond_t *cond,
+				 const struct timespec *abstime)
+     attribute_hidden;
+extern void __lll_cond_wake (pthread_cond_t *cond)
+     attribute_hidden;
+extern void __lll_cond_broadcast (pthread_cond_t *cond)
+     attribute_hidden;
+
+#define lll_cond_wait(cond) \
+  __lll_cond_wait (cond)
+#define lll_cond_timedwait(cond, abstime) \
+  __lll_cond_timedwait (cond, abstime)
+#define lll_cond_wake(cond) \
+  __lll_cond_wake (cond)
+#define lll_cond_broadcast(cond) \
+  __lll_cond_broadcast (cond)
+
+#endif	/* lowlevellock.h */