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Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h')
-rw-r--r--nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h95
1 files changed, 11 insertions, 84 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h b/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h
index 5013922a2f..4626aec524 100644
--- a/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h
+++ b/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
@@ -30,11 +30,6 @@
#define FUTEX_WAKE 1
#define FUTEX_REQUEUE 3
#define FUTEX_CMP_REQUEUE 4
-#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
/* Initializer for compatibility lock. */
#define LLL_MUTEX_LOCK_INITIALIZER (0)
@@ -81,38 +76,15 @@
INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
})
-#define lll_robust_mutex_dead(futexv) \
- do \
- { \
- int *__futexp = &(futexv); \
- atomic_or (__futexp, FUTEX_OWNER_DIED); \
- lll_futex_wake (__futexp, 1); \
- } \
- while (0)
-
-/* Returns non-zero if error happened, zero if success. */
#ifdef __sparc32_atomic_do_lock
-/* Avoid FUTEX_WAKE_OP if supporting pre-v9 CPUs. */
-# define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2) 1
-#else
-# define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2) \
- ({ \
- INTERNAL_SYSCALL_DECL (__err); \
- long int __ret; \
- \
- __ret = INTERNAL_SYSCALL (futex, __err, 6, \
- (futexp), FUTEX_WAKE_OP, (nr_wake), \
- (nr_wake2), (futexp2), \
- FUTEX_OP_CLEAR_WAKE_IF_GT_ONE); \
- INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
- })
+#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_24_acq (futex, 1, 0) != 0;
+ return atomic_compare_and_exchange_val_acq (futex, 1, 0) != 0;
}
#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))
@@ -120,71 +92,47 @@ static inline int
__attribute__ ((always_inline))
__lll_mutex_cond_trylock (int *futex)
{
- return atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0;
+ return atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0;
}
#define lll_mutex_cond_trylock(futex) __lll_mutex_cond_trylock (&(futex))
-static inline int
-__attribute__ ((always_inline))
-__lll_robust_mutex_trylock (int *futex, int id)
-{
- return atomic_compare_and_exchange_val_acq (futex, id, 0) != 0;
-}
-#define lll_robust_mutex_trylock(futex, id) \
- __lll_robust_mutex_trylock (&(futex), id)
-
extern void __lll_lock_wait (int *futex) attribute_hidden;
-extern int __lll_robust_lock_wait (int *futex) attribute_hidden;
+
static inline void
__attribute__ ((always_inline))
__lll_mutex_lock (int *futex)
{
- int val = atomic_compare_and_exchange_val_24_acq (futex, 1, 0);
+ int val = atomic_compare_and_exchange_val_acq (futex, 1, 0);
if (__builtin_expect (val != 0, 0))
__lll_lock_wait (futex);
}
#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex))
-static inline int
-__attribute__ ((always_inline))
-__lll_robust_mutex_lock (int *futex, int id)
-{
- int result = 0;
- if (atomic_compare_and_exchange_bool_acq (futex, id, 0) != 0)
- result = __lll_robust_lock_wait (futex);
- return result;
-}
-#define lll_robust_mutex_lock(futex, id) \
- __lll_robust_mutex_lock (&(futex), id)
static inline void
__attribute__ ((always_inline))
__lll_mutex_cond_lock (int *futex)
{
- int val = atomic_compare_and_exchange_val_24_acq (futex, 2, 0);
+ int val = atomic_compare_and_exchange_val_acq (futex, 2, 0);
if (__builtin_expect (val != 0, 0))
__lll_lock_wait (futex);
}
#define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex))
-#define lll_robust_mutex_cond_lock(futex, id) \
- __lll_robust_mutex_lock (&(futex), (id) | FUTEX_WAITERS)
-
extern int __lll_timedlock_wait (int *futex, const struct timespec *)
attribute_hidden;
-extern int __lll_robust_timedlock_wait (int *futex, const struct timespec *)
- attribute_hidden;
+
static inline int
__attribute__ ((always_inline))
__lll_mutex_timedlock (int *futex, const struct timespec *abstime)
{
- int val = atomic_compare_and_exchange_val_24_acq (futex, 1, 0);
+ int val = atomic_compare_and_exchange_val_acq (futex, 1, 0);
int result = 0;
if (__builtin_expect (val != 0, 0))
@@ -194,39 +142,18 @@ __lll_mutex_timedlock (int *futex, const struct timespec *abstime)
#define lll_mutex_timedlock(futex, abstime) \
__lll_mutex_timedlock (&(futex), abstime)
-static inline int
-__attribute__ ((always_inline))
-__lll_robust_mutex_timedlock (int *futex, const struct timespec *abstime,
- int id)
-{
- int result = 0;
- if (atomic_compare_and_exchange_bool_acq (futex, id, 0) != 0)
- result = __lll_robust_timedlock_wait (futex, abstime);
- return result;
-}
-#define lll_robust_mutex_timedlock(futex, abstime, id) \
- __lll_robust_mutex_timedlock (&(futex), abstime, id)
-
#define lll_mutex_unlock(lock) \
((void) ({ \
int *__futex = &(lock); \
- int __val = atomic_exchange_24_rel (__futex, 0); \
- if (__builtin_expect (__val > 1, 0)) \
- lll_futex_wake (__futex, 1); \
- }))
-
-#define lll_robust_mutex_unlock(lock) \
- ((void) ({ \
- int *__futex = &(lock); \
int __val = atomic_exchange_rel (__futex, 0); \
- if (__builtin_expect (__val & FUTEX_WAITERS, 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_24_rel (__futex, 0); \
+ (void) atomic_exchange_rel (__futex, 0); \
lll_futex_wake (__futex, 1); \
}))
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