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Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/alpha/lowlevellock.h')
-rw-r--r--libpthread/nptl/sysdeps/unix/sysv/linux/alpha/lowlevellock.h255
1 files changed, 161 insertions, 94 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/alpha/lowlevellock.h b/libpthread/nptl/sysdeps/unix/sysv/linux/alpha/lowlevellock.h
index fd4a7ca4b..b7f4de338 100644
--- a/libpthread/nptl/sysdeps/unix/sysv/linux/alpha/lowlevellock.h
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/alpha/lowlevellock.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004, 2006, 2007 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
@@ -24,161 +24,250 @@
#include <bits/pthreadtypes.h>
#include <atomic.h>
#include <sysdep.h>
+#include <bits/kernel-features.h>
-#define __NR_futex 394
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
#define FUTEX_REQUEUE 3
#define FUTEX_CMP_REQUEUE 4
-
-/* Initializer for compatibility lock. */
-#define LLL_MUTEX_LOCK_INITIALIZER (0)
-
-#define lll_futex_wait(futexp, val) \
+#define FUTEX_WAKE_OP 5
+#define FUTEX_OP_CLEAR_WAKE_IF_GT_ONE ((4 << 24) | 1)
+#define FUTEX_LOCK_PI 6
+#define FUTEX_UNLOCK_PI 7
+#define FUTEX_TRYLOCK_PI 8
+#define FUTEX_WAIT_BITSET 9
+#define FUTEX_WAKE_BITSET 10
+#define FUTEX_PRIVATE_FLAG 128
+#define FUTEX_CLOCK_REALTIME 256
+
+#define FUTEX_BITSET_MATCH_ANY 0xffffffff
+
+/* Values for 'private' parameter of locking macros. Yes, the
+ definition seems to be backwards. But it is not. The bit will be
+ reversed before passing to the system call. */
+#define LLL_PRIVATE 0
+#define LLL_SHARED FUTEX_PRIVATE_FLAG
+
+
+#if !defined NOT_IN_libc || defined IS_IN_rtld
+/* In libc.so or ld.so all futexes are private. */
+# ifdef __ASSUME_PRIVATE_FUTEX
+# define __lll_private_flag(fl, private) \
+ ((fl) | FUTEX_PRIVATE_FLAG)
+# else
+# define __lll_private_flag(fl, private) \
+ ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex))
+# endif
+#else
+# ifdef __ASSUME_PRIVATE_FUTEX
+# define __lll_private_flag(fl, private) \
+ (((fl) | FUTEX_PRIVATE_FLAG) ^ (private))
+# else
+# define __lll_private_flag(fl, private) \
+ (__builtin_constant_p (private) \
+ ? ((private) == 0 \
+ ? ((fl) | THREAD_GETMEM (THREAD_SELF, header.private_futex)) \
+ : (fl)) \
+ : ((fl) | (((private) ^ FUTEX_PRIVATE_FLAG) \
+ & THREAD_GETMEM (THREAD_SELF, header.private_futex))))
+# endif
+#endif
+
+
+#define lll_futex_wait(futexp, val, private) \
+ lll_futex_timed_wait (futexp, val, NULL, private)
+
+#define lll_futex_timed_wait(futexp, val, timespec, private) \
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
- __ret = INTERNAL_SYSCALL (futex, __err, 4, \
- (futexp), FUTEX_WAIT, (val), 0); \
+ __ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp), \
+ __lll_private_flag (FUTEX_WAIT, private), \
+ (val), (timespec)); \
INTERNAL_SYSCALL_ERROR_P (__ret, __err)? -__ret : __ret; \
})
-#define lll_futex_timed_wait(futexp, val, timespec) \
+#define lll_futex_wake(futexp, nr, private) \
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
- __ret = INTERNAL_SYSCALL (futex, __err, 4, \
- (futexp), FUTEX_WAIT, (val), (timespec)); \
+ __ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp), \
+ __lll_private_flag (FUTEX_WAKE, private), \
+ (nr), 0); \
INTERNAL_SYSCALL_ERROR_P (__ret, __err)? -__ret : __ret; \
})
-#define lll_futex_wake(futexp, nr) \
+#define lll_robust_dead(futexv, private) \
+ do \
+ { \
+ int *__futexp = &(futexv); \
+ atomic_or (__futexp, FUTEX_OWNER_DIED); \
+ lll_futex_wake (__futexp, 1, private); \
+ } \
+ while (0)
+
+/* Returns non-zero if error happened, zero if success. */
+#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val, private) \
({ \
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 : __ret; \
+ __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \
+ __lll_private_flag (FUTEX_CMP_REQUEUE, private),\
+ (nr_wake), (nr_move), (mutex), (val)); \
+ INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
})
/* Returns non-zero if error happened, zero if success. */
-#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val) \
+#define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2, private) \
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
- __ret = INTERNAL_SYSCALL (futex, __err, 6, \
- (futexp), FUTEX_CMP_REQUEUE, (nr_wake), \
- (nr_move), (mutex), (val)); \
+ __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \
+ __lll_private_flag (FUTEX_WAKE_OP, private), \
+ (nr_wake), (nr_wake2), (futexp2), \
+ FUTEX_OP_CLEAR_WAKE_IF_GT_ONE); \
INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
})
+
+
static inline int __attribute__((always_inline))
-__lll_mutex_trylock(int *futex)
+__lll_trylock(int *futex)
{
return atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0;
}
-#define lll_mutex_trylock(lock) __lll_mutex_trylock (&(lock))
+#define lll_trylock(lock) __lll_trylock (&(lock))
static inline int __attribute__((always_inline))
-__lll_mutex_cond_trylock(int *futex)
+__lll_cond_trylock(int *futex)
{
return atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0;
}
-#define lll_mutex_cond_trylock(lock) __lll_mutex_cond_trylock (&(lock))
+#define lll_cond_trylock(lock) __lll_cond_trylock (&(lock))
-extern void __lll_lock_wait (int *futex) attribute_hidden;
+static inline int __attribute__((always_inline))
+__lll_robust_trylock(int *futex, int id)
+{
+ return atomic_compare_and_exchange_val_acq (futex, id, 0) != 0;
+}
+#define lll_robust_trylock(lock, id) \
+ __lll_robust_trylock (&(lock), id)
+
+extern void __lll_lock_wait_private (int *futex) attribute_hidden;
+extern void __lll_lock_wait (int *futex, int private) attribute_hidden;
+extern int __lll_robust_lock_wait (int *futex, int private) attribute_hidden;
static inline void __attribute__((always_inline))
-__lll_mutex_lock(int *futex)
+__lll_lock(int *futex, int private)
{
if (atomic_compare_and_exchange_bool_acq (futex, 1, 0) != 0)
- __lll_lock_wait (futex);
+ {
+ if (__builtin_constant_p (private) && private == LLL_PRIVATE)
+ __lll_lock_wait_private (futex);
+ else
+ __lll_lock_wait (futex, private);
+ }
+}
+#define lll_lock(futex, private) __lll_lock (&(futex), private)
+
+
+static inline int __attribute__ ((always_inline))
+__lll_robust_lock (int *futex, int id, int private)
+{
+ int result = 0;
+ if (atomic_compare_and_exchange_bool_acq (futex, id, 0) != 0)
+ result = __lll_robust_lock_wait (futex, private);
+ return result;
}
-#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex))
+#define lll_robust_lock(futex, id, private) \
+ __lll_robust_lock (&(futex), id, private)
static inline void __attribute__ ((always_inline))
-__lll_mutex_cond_lock (int *futex)
+__lll_cond_lock (int *futex, int private)
{
if (atomic_compare_and_exchange_bool_acq (futex, 2, 0) != 0)
- __lll_lock_wait (futex);
+ __lll_lock_wait (futex, private);
}
-#define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex))
+#define lll_cond_lock(futex, private) __lll_cond_lock (&(futex), private)
+
+
+#define lll_robust_cond_lock(futex, id, private) \
+ __lll_robust_lock (&(futex), (id) | FUTEX_WAITERS, private)
-extern int __lll_timedlock_wait (int *futex, const struct timespec *)
- attribute_hidden;
+extern int __lll_timedlock_wait (int *futex, const struct timespec *,
+ int private) attribute_hidden;
+extern int __lll_robust_timedlock_wait (int *futex, const struct timespec *,
+ int private) attribute_hidden;
static inline int __attribute__ ((always_inline))
-__lll_mutex_timedlock (int *futex, const struct timespec *abstime)
+__lll_timedlock (int *futex, const struct timespec *abstime, int private)
{
int result = 0;
if (atomic_compare_and_exchange_bool_acq (futex, 1, 0) != 0)
- result = __lll_timedlock_wait (futex, abstime);
+ result = __lll_timedlock_wait (futex, abstime, private);
return result;
}
-#define lll_mutex_timedlock(futex, abstime) \
- __lll_mutex_timedlock (&(futex), abstime)
+#define lll_timedlock(futex, abstime, private) \
+ __lll_timedlock (&(futex), abstime, private)
-static inline void __attribute__ ((always_inline))
-__lll_mutex_unlock (int *futex)
+static inline int __attribute__ ((always_inline))
+__lll_robust_timedlock (int *futex, const struct timespec *abstime,
+ int id, int private)
{
- int val = atomic_exchange_rel (futex, 0);
- if (__builtin_expect (val > 1, 0))
- lll_futex_wake (futex, 1);
+ int result = 0;
+ if (atomic_compare_and_exchange_bool_acq (futex, id, 0) != 0)
+ result = __lll_robust_timedlock_wait (futex, abstime, private);
+ return result;
}
-#define lll_mutex_unlock(futex) __lll_mutex_unlock(&(futex))
-
+#define lll_robust_timedlock(futex, abstime, id, private) \
+ __lll_robust_timedlock (&(futex), abstime, id, private)
-static inline void __attribute__ ((always_inline))
-__lll_mutex_unlock_force (int *futex)
-{
- (void) atomic_exchange_rel (futex, 0);
- lll_futex_wake (futex, 1);
-}
-#define lll_mutex_unlock_force(futex) __lll_mutex_unlock_force(&(futex))
+#define __lll_unlock(futex, private) \
+ (void) \
+ ({ int *__futex = (futex); \
+ int __oldval = atomic_exchange_rel (__futex, 0); \
+ if (__builtin_expect (__oldval > 1, 0)) \
+ lll_futex_wake (__futex, 1, private); \
+ })
+#define lll_unlock(futex, private) __lll_unlock(&(futex), private)
-#define lll_mutex_islocked(futex) \
- (futex != 0)
+#define __lll_robust_unlock(futex, private) \
+ (void) \
+ ({ int *__futex = (futex); \
+ int __oldval = atomic_exchange_rel (__futex, 0); \
+ if (__builtin_expect (__oldval & FUTEX_WAITERS, 0)) \
+ lll_futex_wake (__futex, 1, private); \
+ })
+#define lll_robust_unlock(futex, private) \
+ __lll_robust_unlock(&(futex), private)
-/* Our internal lock implementation is identical to the binary-compatible
- mutex implementation. */
-/* Type for lock object. */
-typedef int lll_lock_t;
+#define lll_islocked(futex) \
+ (futex != 0)
/* 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); \
+ do { \
+ __typeof (tid) __tid; \
+ while ((__tid = (tid)) != 0) \
+ lll_futex_wait (&(tid), __tid, LLL_SHARED); \
} while (0)
extern int __lll_timedwait_tid (int *, const struct timespec *)
@@ -192,26 +281,4 @@ extern int __lll_timedwait_tid (int *, const struct timespec *)
__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 */
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