Low level lock definitions for nptl on Alpha.

diff --git a/sysdeps/unix/sysv/linux/alpha/nptl/lowlevellock.h b/sysdeps/unix/sysv/linux/alpha/nptl/lowlevellock.h
new file mode 100644 (file)
index 0000000..e286ef3
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+++ 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 */