Loelvel definitions for locks on Linux/SPARC.
authordrepper <drepper>
Sun, 31 Aug 2003 17:35:21 +0000 (17:35 +0000)
committerdrepper <drepper>
Sun, 31 Aug 2003 17:35:21 +0000 (17:35 +0000)
nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h [new file with mode: 0644]

diff --git a/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h b/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h
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+/* Copyright (C) 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.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 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 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);                \
+    __ret;                                                                   \
+  })
+
+#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));       \
+    __ret;                                                                   \
+  })
+
+#define lll_futex_wake(futexp, nr) \
+  ({                                                                         \
+    INTERNAL_SYSCALL_DECL (__err);                                           \
+    long int __ret;                                                          \
+                                                                             \
+    __ret = INTERNAL_SYSCALL (futex, __err, 4,                               \
+                             (futexp), FUTEX_WAKE, (nr), 0);                 \
+    __ret;                                                                   \
+  })
+
+#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));                                       \
+    __ret;                                                                   \
+  })
+
+#ifdef __sparc32_atomic_do_lock
+#error SPARC < v9 does not support compare and swap which is essential for futex based locking
+#endif
+
+static inline int
+__attribute__ ((always_inline))
+__lll_mutex_trylock (int *futex)
+{
+  return atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0;
+}
+#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))
+
+
+extern void __lll_lock_wait (int *futex, int val) attribute_hidden;
+
+
+static inline void
+__attribute__ ((always_inline))
+__lll_mutex_lock (int *futex)
+{
+  int val = atomic_exchange_and_add (futex, 1);
+
+  if (__builtin_expect (val != 0, 0))
+    __lll_lock_wait (futex, val);
+}
+#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex))
+
+
+static inline void
+__attribute__ ((always_inline))
+__lll_mutex_cond_lock (int *futex)
+{
+  int val = atomic_exchange_and_add (futex, 2);
+
+  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);
+}
+#define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex))
+
+
+extern int __lll_timedlock_wait (int *futex, int val, const struct timespec *)
+     attribute_hidden;
+
+
+static inline int
+__attribute__ ((always_inline))
+__lll_mutex_timedlock (int *futex, const struct timespec *abstime)
+{
+  int val = atomic_exchange_and_add (futex, 1);
+  int result = 0;
+
+  if (__builtin_expect (val != 0, 0))
+    result = __lll_timedlock_wait (futex, val, abstime);
+
+  return result;
+}
+#define lll_mutex_timedlock(futex, abstime) \
+  __lll_mutex_timedlock (&(futex), abstime)
+
+#define lll_mutex_unlock(lock) \
+  ((void) ({                                                                 \
+    int *__futex = &(lock);                                                  \
+    int __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);                                                  \
+    (void) atomic_exchange_rel (__futex, 0);                                 \
+    lll_futex_wake (__futex, 1);                                             \
+  }))
+
+#define lll_mutex_islocked(futex) \
+  (futex != 0)
+
+
+/* We have a separate internal lock implementation which is not tied
+   to binary compatibility.  We can use the lll_mutex_*.  */
+
+/* Type for lock object.  */
+typedef int lll_lock_t;
+
+extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
+
+/* Initializers for lock.  */
+#define LLL_LOCK_INITIALIZER           (0)
+#define LLL_LOCK_INITIALIZER_LOCKED    (1)
+
+#define lll_trylock(futex)     lll_mutex_trylock (futex)
+#define lll_lock(futex)                lll_mutex_lock (futex)
+#define lll_unlock(futex)      lll_mutex_unlock (futex)
+#define lll_islocked(futex)    lll_mutex_islocked (futex)
+
+
+/* The kernel notifies a process with 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 */