#include <bits/pthreadtypes.h>
#include <atomic.h>
#include <sysdep.h>
+#include <kernel-features.h>
#define FUTEX_WAIT 0
#define FUTEX_WAKE 1
#define LLL_PRIVATE 0
#define LLL_SHARED FUTEX_PRIVATE_FLAG
-/* Initializer for compatibility lock. */
-#define LLL_MUTEX_LOCK_INITIALIZER (0)
+
+#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)
({ \
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, private) \
- ({ \
- INTERNAL_SYSCALL_DECL (__err); \
- long int __ret; \
- __ret = INTERNAL_SYSCALL (futex, __err, 4, \
- (futexp), FUTEX_WAKE, (nr), 0); \
- __ret; \
- })
-
-#define lll_private_futex_wait(futexp, val) \
- lll_private_futex_timed_wait(futexp, val, NULL)
-
-#ifdef __ASSUME_PRIVATE_FUTEX
-#define lll_private_futex_timed_wait(futexp, val, timespec) \
- ({ \
- INTERNAL_SYSCALL_DECL (__err); \
- long int __ret; \
- __ret = INTERNAL_SYSCALL (futex, __err, 4, \
- (futexp), FUTEX_WAIT | FUTEX_PRIVATE_FLAG, \
+ __ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp), \
+ __lll_private_flag (FUTEX_WAIT, private), \
(val), (timespec)); \
__ret; \
})
-#define lll_private_futex_wake(futexp, nr) \
+#define lll_futex_wake(futexp, nr, private) \
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
- __ret = INTERNAL_SYSCALL (futex, __err, 4, \
- (futexp), FUTEX_WAKE | FUTEX_PRIVATE_FLAG, \
- (nr), (0)); \
- __ret; \
- })
-#else
-#define lll_private_futex_timed_wait(futexp, val, timespec) \
- ({ \
- INTERNAL_SYSCALL_DECL (__err); \
- long int __ret, __op; \
- __op = FUTEX_WAIT | THREAD_GETMEM (THREAD_SELF, header.private_futex); \
- __ret = INTERNAL_SYSCALL (futex, __err, 4, \
- (futexp), __op, (val), (timespec)); \
+ __ret = INTERNAL_SYSCALL (futex, __err, 4, (futexp), \
+ __lll_private_flag (FUTEX_WAKE, private), \
+ (nr), 0); \
__ret; \
})
-#define lll_private_futex_wake(futexp, nr) \
- ({ \
- INTERNAL_SYSCALL_DECL (__err); \
- long int __ret, __op; \
- __op = FUTEX_WAKE | THREAD_GETMEM (THREAD_SELF, header.private_futex); \
- __ret = INTERNAL_SYSCALL (futex, __err, 4, \
- (futexp), __op, (nr), 0); \
- __ret; \
- })
-#endif
-
-#define lll_robust_mutex_dead(futexv) \
+#define lll_robust_dead(futexv, private) \
do \
{ \
int *__futexp = &(futexv); \
atomic_or (__futexp, FUTEX_OWNER_DIED); \
- lll_futex_wake (__futexp, 1, 0); \
+ 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) \
+#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val, 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_CMP_REQUEUE, private),\
+ (nr_wake), (nr_move), (mutex), (val)); \
__ret; \
})
({ \
INTERNAL_SYSCALL_DECL (__err); \
long int __ret; \
- __ret = INTERNAL_SYSCALL (futex, __err, 6, \
- (futexp), FUTEX_WAKE_OP, (nr_wake), \
- (nr_wake2), (futexp2), \
+ __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); \
__ret; \
})
static inline int __attribute__((always_inline))
-__lll_mutex_trylock (int *futex)
+__lll_trylock (int *futex)
{
int flag = 1, old;
asm volatile (
return flag;
}
-#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)
{
int flag = 2, old;
asm volatile (
return flag;
}
-#define lll_mutex_cond_trylock(lock) __lll_mutex_cond_trylock (&(lock))
-
-
-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(lock, id) \
- __lll_robust_mutex_trylock (&(lock), id)
-
-extern int __lll_robust_lock_wait (int *futex) attribute_hidden;
-
-static inline void __attribute__((always_inline))
-__lll_mutex_lock (int *futex)
-{
- int val = atomic_exchange_acq (futex, 1);
-
- if (__builtin_expect (val != 0, 0))
- {
- while (atomic_exchange_acq (futex, 2) != 0)
- lll_futex_wait (futex, 2, 0);
- }
-}
-#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_exchange_acq (futex, 2);
-
- if (__builtin_expect (val != 0, 0))
- {
- while (atomic_exchange_acq (futex, 2) != 0)
- lll_futex_wait (futex, 2, 0);
- }
-}
-#define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex))
+#define lll_cond_trylock(lock) __lll_cond_trylock (&(lock))
+
+
+#define __lll_robust_trylock(futex, id) \
+ (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;
+
+#define __lll_lock(futex, private) \
+ ((void) ({ \
+ int *__futex = (futex); \
+ if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, \
+ 1, 0), 0)) \
+ { \
+ 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)
+
+
+#define __lll_robust_lock(futex, id, private) \
+ ({ \
+ int *__futex = (futex); \
+ int __val = 0; \
+ \
+ if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, id, \
+ 0), 0)) \
+ __val = __lll_robust_lock_wait (__futex, private); \
+ __val; \
+ })
+#define lll_robust_lock(futex, id, private) \
+ __lll_robust_lock (&(futex), id, private)
-#define lll_robust_mutex_cond_lock(futex, id) \
- __lll_robust_mutex_lock (&(futex), (id) | FUTEX_WAITERS)
+#define __lll_cond_lock(futex, private) \
+ ((void) ({ \
+ int *__futex = (futex); \
+ if (__builtin_expect (atomic_exchange_acq (__futex, 2), 0)) \
+ __lll_lock_wait (__futex, private); \
+ }))
+#define lll_cond_lock(futex, private) __lll_cond_lock (&(futex), private)
-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;
+#define lll_robust_cond_lock(futex, id, private) \
+ __lll_robust_lock (&(futex), (id) | FUTEX_WAITERS, private)
-static inline int __attribute__ ((always_inline))
-__lll_mutex_timedlock (int *futex, const struct timespec *abstime)
-{
- int result = 0;
- int val = atomic_exchange_acq (futex, 1);
- if (__builtin_expect (val != 0, 0))
- result = __lll_timedlock_wait (futex, abstime);
- return result;
-}
-#define lll_mutex_timedlock(futex, abstime) \
- __lll_mutex_timedlock (&(futex), abstime)
+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_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_timedlock(futex, abstime, private) \
+ ({ \
+ int *__futex = (futex); \
+ int __val = 0; \
+ \
+ if (__builtin_expect (atomic_exchange_acq (__futex, 1), 0)) \
+ __val = __lll_timedlock_wait (__futex, abstime, private); \
+ __val; \
+ })
+#define lll_timedlock(futex, abstime, private) \
+ __lll_timedlock (&(futex), abstime, private)
-static inline void __attribute__ ((always_inline))
-__lll_mutex_unlock (int *futex)
-{
- int val = atomic_exchange_rel (futex, 0);
- if (__builtin_expect (val > 1, 0))
- lll_futex_wake (futex, 1, 0);
-}
-#define lll_mutex_unlock(futex) __lll_mutex_unlock(&(futex))
+#define __lll_robust_timedlock(futex, abstime, id, private) \
+ ({ \
+ int *__futex = (futex); \
+ int __val = 0; \
+ \
+ if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, id, \
+ 0), 0)) \
+ __val = __lll_robust_timedlock_wait (__futex, abstime, private); \
+ __val; \
+ })
+#define lll_robust_timedlock(futex, abstime, id, private) \
+ __lll_robust_timedlock (&(futex), abstime, id, private)
-static inline void __attribute__ ((always_inline))
-__lll_robust_mutex_unlock (int *futex, int mask)
-{
- int val = atomic_exchange_rel (futex, 0);
- if (__builtin_expect (val & mask, 0))
- lll_futex_wake (futex, 1, 0);
-}
-#define lll_robust_mutex_unlock(futex) \
- __lll_robust_mutex_unlock(&(futex), FUTEX_WAITERS)
+#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)
-static inline void __attribute__ ((always_inline))
-__lll_mutex_unlock_force (int *futex)
-{
- (void) atomic_exchange_rel (futex, 0);
- lll_futex_wake (futex, 1, 0);
-}
-#define lll_mutex_unlock_force(futex) __lll_mutex_unlock_force(&(futex))
+#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)
-#define lll_mutex_islocked(futex) \
+#define lll_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)
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
do { \
__typeof (tid) __tid; \
while ((__tid = (tid)) != 0) \
- lll_futex_wait (&(tid), __tid, 0);\
+ lll_futex_wait (&(tid), __tid, LLL_SHARED);\
} while (0)
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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