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-rw-r--r--libpthread/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h190
1 files changed, 110 insertions, 80 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h b/libpthread/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h
index 4626aec52..4db6fb0b4 100644
--- a/libpthread/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/sparc/lowlevellock.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
@@ -24,33 +24,28 @@
#include <sys/param.h>
#include <bits/pthreadtypes.h>
#include <atomic.h>
+#include <sysdep.h>
#define FUTEX_WAIT 0
#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)
/* 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; \
- })
+ lll_futex_timed_wait (futexp, val, NULL)
#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 = INTERNAL_SYSCALL (futex, __err, 4, (futexp), \
+ FUTEX_WAIT, (val), (timespec)); \
__ret; \
})
@@ -58,9 +53,8 @@
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
- \
- __ret = INTERNAL_SYSCALL (futex, __err, 4, \
- (futexp), FUTEX_WAKE, (nr), 0); \
+ __ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp), \
+ FUTEX_WAKE, (nr), 0); \
__ret; \
})
@@ -69,70 +63,115 @@
({ \
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), \
+ FUTEX_CMP_REQUEUE, (nr_wake), (nr_move), (mutex), (val)); \
INTERNAL_SYSCALL_ERROR_P (__ret, __err); \
})
+#define lll_robust_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
-#error SPARC < v9 does not support compare and swap which is essential for futex based locking
+/* 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); \
+ })
#endif
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;
+ return atomic_compare_and_exchange_val_24_acq (futex, 1, 0) != 0;
}
-#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))
+#define lll_mutex_trylock(futex) __lll_trylock (&(futex))
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;
+ return atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0;
}
-#define lll_mutex_cond_trylock(futex) __lll_mutex_cond_trylock (&(futex))
+#define lll_mutex_cond_trylock(futex) __lll_cond_trylock (&(futex))
+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(futex, id) \
+ __lll_robust_trylock (&(futex), id)
-extern void __lll_lock_wait (int *futex) attribute_hidden;
+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)
+__lll_lock (int *futex)
{
- int val = atomic_compare_and_exchange_val_acq (futex, 1, 0);
+ int val = atomic_compare_and_exchange_val_24_acq (futex, 1, 0);
if (__builtin_expect (val != 0, 0))
- __lll_lock_wait (futex);
+ {
+ __lll_lock_wait (futex);
+ }
}
-#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex))
+#define lll_mutex_lock(futex) __lll_lock (&(futex))
+static inline int
+__attribute__ ((always_inline))
+__lll_robust_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_lock(futex, id) \
+ __lll_robust_lock (&(futex), id)
static inline void
__attribute__ ((always_inline))
-__lll_mutex_cond_lock (int *futex)
+__lll_cond_lock (int *futex)
{
- int val = atomic_compare_and_exchange_val_acq (futex, 2, 0);
+ int val = atomic_compare_and_exchange_val_24_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_mutex_cond_lock(futex) __lll_cond_lock (&(futex))
+#define lll_robust_cond_lock(futex, id) \
+ __lll_robust_lock (&(futex), (id) | FUTEX_WAITERS)
-extern int __lll_timedlock_wait (int *futex, const struct timespec *)
- attribute_hidden;
+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)
+__lll_timedlock (int *futex, const struct timespec *abstime)
{
- int val = atomic_compare_and_exchange_val_acq (futex, 1, 0);
+ int val = atomic_compare_and_exchange_val_24_acq (futex, 1, 0);
int result = 0;
if (__builtin_expect (val != 0, 0))
@@ -140,43 +179,56 @@ __lll_mutex_timedlock (int *futex, const struct timespec *abstime)
return result;
}
#define lll_mutex_timedlock(futex, abstime) \
- __lll_mutex_timedlock (&(futex), abstime)
+ __lll_timedlock (&(futex), abstime)
+
+static inline int
+__attribute__ ((always_inline))
+__lll_robust_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_timedlock(futex, abstime, id) \
+ __lll_robust_timedlock (&(futex), abstime, id)
#define lll_mutex_unlock(lock) \
((void) ({ \
int *__futex = &(lock); \
- int __val = atomic_exchange_rel (__futex, 0); \
+ int __val = atomic_exchange_24_rel (__futex, 0); \
if (__builtin_expect (__val > 1, 0)) \
- lll_futex_wake (__futex, 1); \
+ lll_futex_wake (__futex, 1); \
}))
-#define lll_mutex_unlock_force(lock) \
+#define lll_robust_unlock(lock) \
((void) ({ \
int *__futex = &(lock); \
- (void) atomic_exchange_rel (__futex, 0); \
- lll_futex_wake (__futex, 1); \
+ int __val = atomic_exchange_rel (__futex, 0); \
+ if (__builtin_expect (__val & FUTEX_WAITERS, 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_*. */
+ to binary compatibility. */
/* 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)
+extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
+
+#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 with uses CLONE_CLEARTID via futex
@@ -184,12 +236,12 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
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); \
+ } \
while (0)
extern int __lll_timedwait_tid (int *, const struct timespec *)
@@ -203,26 +255,4 @@ 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 */
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-14 14:55:17 +0000