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-rw-r--r--libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h251
1 files changed, 162 insertions, 89 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h b/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h
index 1f2f481d6..66c02cbbd 100644
--- a/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004, 2006-2008, 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
@@ -24,7 +24,7 @@
#include <sys/param.h>
#include <bits/pthreadtypes.h>
#include <atomic.h>
-
+#include <kernel-features.h>
#ifndef __NR_futex
# define __NR_futex 221
@@ -33,167 +33,262 @@
#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
+#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
-/* Initializer for compatibility lock. */
-#define LLL_MUTEX_LOCK_INITIALIZER (0)
+#define lll_futex_wait(futexp, val, private) \
+ lll_futex_timed_wait (futexp, val, NULL, private)
-#define lll_futex_wait(futexp, val) \
+#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 \
+ { \
+ INTERNAL_SYSCALL_DECL (__err); \
+ int *__futexp = &(futexv); \
+ \
+ atomic_or (__futexp, FUTEX_OWNER_DIED); \
+ INTERNAL_SYSCALL (futex, __err, 4, __futexp, \
+ __lll_private_flag (FUTEX_WAKE, private), 1, 0); \
+ } \
+ 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); \
})
+
#ifdef UP
# define __lll_acq_instr ""
# define __lll_rel_instr ""
#else
# define __lll_acq_instr "isync"
-# define __lll_rel_instr "sync"
+# ifdef _ARCH_PWR4
+/*
+ * Newer powerpc64 processors support the new "light weight" sync (lwsync)
+ * So if the build is using -mcpu=[power4,power5,power5+,970] we can
+ * safely use lwsync.
+ */
+# define __lll_rel_instr "lwsync"
+# else
+/*
+ * Older powerpc32 processors don't support the new "light weight"
+ * sync (lwsync). So the only safe option is to use normal sync
+ * for all powerpc32 applications.
+ */
+# define __lll_rel_instr "sync"
+# endif
#endif
-/* Set *futex to 1 if it is 0, atomically. Returns the old value */
-#define __lll_trylock(futex) \
+/* Set *futex to ID if it is 0, atomically. Returns the old value */
+#define __lll_robust_trylock(futex, id) \
({ int __val; \
- __asm __volatile ("1: lwarx %0,0,%2\n" \
+ __asm __volatile ("1: lwarx %0,0,%2" MUTEX_HINT_ACQ "\n" \
" cmpwi 0,%0,0\n" \
" bne 2f\n" \
" stwcx. %3,0,%2\n" \
" bne- 1b\n" \
"2: " __lll_acq_instr \
: "=&r" (__val), "=m" (*futex) \
- : "r" (futex), "r" (1), "m" (*futex) \
+ : "r" (futex), "r" (id), "m" (*futex) \
: "cr0", "memory"); \
__val; \
})
-#define lll_mutex_trylock(lock) __lll_trylock (&(lock))
+#define lll_robust_trylock(lock, id) __lll_robust_trylock (&(lock), id)
+
+/* Set *futex to 1 if it is 0, atomically. Returns the old value */
+#define __lll_trylock(futex) __lll_robust_trylock (futex, 1)
+
+#define lll_trylock(lock) __lll_trylock (&(lock))
/* Set *futex to 2 if it is 0, atomically. Returns the old value */
-#define __lll_cond_trylock(futex) \
- ({ int __val; \
- __asm __volatile ("1: lwarx %0,0,%2\n" \
- " cmpwi 0,%0,0\n" \
- " bne 2f\n" \
- " stwcx. %3,0,%2\n" \
- " bne- 1b\n" \
- "2: " __lll_acq_instr \
- : "=&r" (__val), "=m" (*futex) \
- : "r" (futex), "r" (2), "m" (*futex) \
- : "cr0", "memory"); \
- __val; \
- })
-#define lll_mutex_cond_trylock(lock) __lll_cond_trylock (&(lock))
+#define __lll_cond_trylock(futex) __lll_robust_trylock (futex, 2)
+#define lll_cond_trylock(lock) __lll_cond_trylock (&(lock))
-extern void __lll_lock_wait (int *futex) attribute_hidden;
-#define lll_mutex_lock(lock) \
+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(lock, private) \
(void) ({ \
int *__futex = &(lock); \
if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\
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_robust_lock(lock, id, private) \
+ ({ \
+ int *__futex = &(lock); \
+ 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_mutex_cond_lock(lock) \
+#define lll_cond_lock(lock, private) \
(void) ({ \
int *__futex = &(lock); \
if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 2, 0),\
0) != 0) \
- __lll_lock_wait (__futex); \
+ __lll_lock_wait (__futex, private); \
+ })
+
+#define lll_robust_cond_lock(lock, id, private) \
+ ({ \
+ int *__futex = &(lock); \
+ int __val = 0; \
+ int __id = id | FUTEX_WAITERS; \
+ if (__builtin_expect (atomic_compare_and_exchange_bool_acq (__futex, __id,\
+ 0), 0)) \
+ __val = __lll_robust_lock_wait (__futex, private); \
+ __val; \
})
+
extern int __lll_timedlock_wait
- (int *futex, const struct timespec *) attribute_hidden;
+ (int *futex, const struct timespec *, int private) attribute_hidden;
+extern int __lll_robust_timedlock_wait
+ (int *futex, const struct timespec *, int private) attribute_hidden;
-#define lll_mutex_timedlock(lock, abstime) \
+#define lll_timedlock(lock, abstime, private) \
({ \
int *__futex = &(lock); \
int __val = 0; \
if (__builtin_expect (atomic_compare_and_exchange_val_acq (__futex, 1, 0),\
0) != 0) \
- __val = __lll_timedlock_wait (__futex, abstime); \
+ __val = __lll_timedlock_wait (__futex, abstime, private); \
+ __val; \
+ })
+
+#define lll_robust_timedlock(lock, abstime, id, private) \
+ ({ \
+ int *__futex = &(lock); \
+ 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_mutex_unlock(lock) \
+#define lll_unlock(lock, private) \
((void) ({ \
int *__futex = &(lock); \
int __val = atomic_exchange_rel (__futex, 0); \
if (__builtin_expect (__val > 1, 0)) \
- lll_futex_wake (__futex, 1); \
+ lll_futex_wake (__futex, 1, private); \
}))
-#define lll_mutex_unlock_force(lock) \
+#define lll_robust_unlock(lock, private) \
((void) ({ \
int *__futex = &(lock); \
- *__futex = 0; \
- __asm __volatile (__lll_rel_instr ::: "memory"); \
- lll_futex_wake (__futex, 1); \
+ int __val = atomic_exchange_rel (__futex, 0); \
+ if (__builtin_expect (__val & FUTEX_WAITERS, 0)) \
+ lll_futex_wake (__futex, 1, 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)
-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
@@ -202,7 +297,7 @@ extern int lll_unlock_wake_cb (int *__futex) attribute_hidden;
do { \
__typeof (tid) __tid; \
while ((__tid = (tid)) != 0) \
- lll_futex_wait (&(tid), __tid); \
+ lll_futex_wait (&(tid), __tid, LLL_SHARED); \
} while (0)
extern int __lll_timedwait_tid (int *, const struct timespec *)
@@ -216,26 +311,4 @@ 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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