diff options
| -rw-r--r-- | ChangeLog | 9 | ||||
| -rw-r--r-- | sysdeps/s390/bits/atomic.h | 41 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/s390/lowlevellock.h | 335 |
3 files changed, 60 insertions, 325 deletions
diff --git a/ChangeLog b/ChangeLog index b09206cd36..60d99fe3a4 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,12 @@ +2015-02-20 Stefan Liebler <stli@linux.vnet.ibm.com> + + * sysdeps/unix/sysv/linux/s390/lowlevellock.h: Include + <sysdeps/nptl/lowlevellock.h> and remove macros and + functions that are now defined there. + (SYS_futex): Remove. + (lll_compare_and_swap): Remove. + * sysdeps/s390/bits/atomic.h (atomic_exchange_acq): Define. + 2015-02-19 Joseph Myers <joseph@codesourcery.com> [BZ #17999] diff --git a/sysdeps/s390/bits/atomic.h b/sysdeps/s390/bits/atomic.h index a85288280c..16c8c54b94 100644 --- a/sysdeps/s390/bits/atomic.h +++ b/sysdeps/s390/bits/atomic.h @@ -77,3 +77,44 @@ typedef uintmax_t uatomic_max_t; # define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \ (abort (), (__typeof (*mem)) 0) #endif + +/* Store NEWVALUE in *MEM and return the old value. */ +/* On s390, the atomic_exchange_acq is different from generic implementation, + because the generic one does not use the condition-code of cs-instruction + to determine if looping is needed. Instead it saves the old-value and + compares it against old-value returned by cs-instruction. */ +#ifdef __s390x__ +# define atomic_exchange_acq(mem, newvalue) \ + ({ __typeof (mem) __atg5_memp = (mem); \ + __typeof (*(mem)) __atg5_oldval = *__atg5_memp; \ + __typeof (*(mem)) __atg5_value = (newvalue); \ + if (sizeof (*mem) == 4) \ + __asm __volatile ("0: cs %0,%2,%1\n" \ + " jl 0b" \ + : "+d" (__atg5_oldval), "=Q" (*__atg5_memp) \ + : "d" (__atg5_value), "m" (*__atg5_memp) \ + : "cc", "memory" ); \ + else if (sizeof (*mem) == 8) \ + __asm __volatile ("0: csg %0,%2,%1\n" \ + " jl 0b" \ + : "+d" ( __atg5_oldval), "=Q" (*__atg5_memp) \ + : "d" ((long) __atg5_value), "m" (*__atg5_memp) \ + : "cc", "memory" ); \ + else \ + abort (); \ + __atg5_oldval; }) +#else +# define atomic_exchange_acq(mem, newvalue) \ + ({ __typeof (mem) __atg5_memp = (mem); \ + __typeof (*(mem)) __atg5_oldval = *__atg5_memp; \ + __typeof (*(mem)) __atg5_value = (newvalue); \ + if (sizeof (*mem) == 4) \ + __asm __volatile ("0: cs %0,%2,%1\n" \ + " jl 0b" \ + : "+d" (__atg5_oldval), "=Q" (*__atg5_memp) \ + : "d" (__atg5_value), "m" (*__atg5_memp) \ + : "cc", "memory" ); \ + else \ + abort (); \ + __atg5_oldval; }) +#endif diff --git a/sysdeps/unix/sysv/linux/s390/lowlevellock.h b/sysdeps/unix/sysv/linux/s390/lowlevellock.h index a46885951e..163a731bd3 100644 --- a/sysdeps/unix/sysv/linux/s390/lowlevellock.h +++ b/sysdeps/unix/sysv/linux/s390/lowlevellock.h @@ -16,335 +16,20 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ -#ifndef _LOWLEVELLOCK_H -#define _LOWLEVELLOCK_H 1 +#ifndef _S390_LOWLEVELLOCK_H +#define _S390_LOWLEVELLOCK_H 1 -#include <time.h> -#include <sys/param.h> -#include <bits/pthreadtypes.h> -#include <atomic.h> -#include <kernel-features.h> +#include <sysdeps/nptl/lowlevellock.h> -#define SYS_futex 238 -#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) -#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_WAIT_REQUEUE_PI 11 -#define FUTEX_CMP_REQUEUE_PI 12 -#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 IS_IN (libc) || 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(futex, val, private) \ - lll_futex_timed_wait (futex, val, NULL, private) - -#define lll_futex_timed_wait(futexp, val, timespec, private) \ - ({ \ - INTERNAL_SYSCALL_DECL (__err); \ - \ - INTERNAL_SYSCALL (futex, __err, 4, (futexp), \ - __lll_private_flag (FUTEX_WAIT, private), \ - (val), (timespec)); \ - }) - -#define lll_futex_timed_wait_bitset(futexp, val, timespec, clockbit, private) \ - ({ \ - INTERNAL_SYSCALL_DECL (__err); \ - int __op = FUTEX_WAIT_BITSET | clockbit; \ - \ - INTERNAL_SYSCALL (futex, __err, 6, (futexp), \ - __lll_private_flag (__op, private), \ - (val), (timespec), NULL /* Unused. */, \ - FUTEX_BITSET_MATCH_ANY); \ - }) - -#define lll_futex_wake(futexp, nr, private) \ - ({ \ - INTERNAL_SYSCALL_DECL (__err); \ - \ - INTERNAL_SYSCALL (futex, __err, 4, (futexp), \ - __lll_private_flag (FUTEX_WAKE, private), \ - (nr), 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, 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_wake_unlock(futexp, nr_wake, nr_wake2, futexp2, private) \ - ({ \ - INTERNAL_SYSCALL_DECL (__err); \ - long int __ret; \ - \ - __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); \ - }) - -/* Priority Inheritance support. */ -#define lll_futex_wait_requeue_pi(futexp, val, mutex, private) \ - lll_futex_timed_wait_requeue_pi (futexp, val, NULL, 0, mutex, private) - -#define lll_futex_timed_wait_requeue_pi(futexp, val, timespec, clockbit, \ - mutex, private) \ - ({ \ - INTERNAL_SYSCALL_DECL (__err); \ - int __op = FUTEX_WAIT_REQUEUE_PI | clockbit; \ - \ - INTERNAL_SYSCALL (futex, __err, 5, (futexp), \ - __lll_private_flag (__op, private), \ - (val), (timespec), mutex); \ - }) - -#define lll_futex_cmp_requeue_pi(futexp, nr_wake, nr_move, mutex, val, priv) \ - ({ \ - INTERNAL_SYSCALL_DECL (__err); \ - long int __ret; \ - \ - __ret = INTERNAL_SYSCALL (futex, __err, 6, (futexp), \ - __lll_private_flag (FUTEX_CMP_REQUEUE_PI, priv),\ - (nr_wake), (nr_move), (mutex), (val)); \ - INTERNAL_SYSCALL_ERROR_P (__ret, __err); \ - }) - -#define lll_compare_and_swap(futex, oldval, newval, operation) \ - do { \ - __typeof (futex) __futex = (futex); \ - __asm __volatile (" l %1,%0\n" \ - "0: " operation "\n" \ - " cs %1,%2,%0\n" \ - " jl 0b\n" \ - "1:" \ - : "=Q" (*__futex), "=&d" (oldval), "=&d" (newval) \ - : "m" (*__futex) : "cc", "memory" ); \ - } while (0) - - -static inline int -__attribute__ ((always_inline)) -__lll_trylock (int *futex) -{ - unsigned int old; - - __asm __volatile ("cs %0,%3,%1" - : "=d" (old), "=Q" (*futex) - : "0" (0), "d" (1), "m" (*futex) : "cc", "memory" ); - return old != 0; -} -#define lll_trylock(futex) __lll_trylock (&(futex)) - - -static inline int -__attribute__ ((always_inline)) -__lll_cond_trylock (int *futex) -{ - unsigned int old; - - __asm __volatile ("cs %0,%3,%1" - : "=d" (old), "=Q" (*futex) - : "0" (0), "d" (2), "m" (*futex) : "cc", "memory" ); - return old != 0; -} -#define lll_cond_trylock(futex) __lll_cond_trylock (&(futex)) - - -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_lock (int *futex, int private) -{ - if (__glibc_unlikely (atomic_compare_and_exchange_bool_acq (futex, 1, 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) - -static inline int -__attribute__ ((always_inline)) -__lll_robust_lock (int *futex, int id, int private) -{ - int result = 0; - if (__builtin_expect (atomic_compare_and_exchange_bool_acq (futex, id, 0), - 0)) - result = __lll_robust_lock_wait (futex, private); - return result; -} -#define lll_robust_lock(futex, id, private) \ - __lll_robust_lock (&(futex), id, private) - -static inline void -__attribute__ ((always_inline)) -__lll_cond_lock (int *futex, int private) -{ - if (__glibc_unlikely (atomic_compare_and_exchange_bool_acq (futex, 2, 0))) - __lll_lock_wait (futex, private); -} -#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 *, 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_timedlock (int *futex, const struct timespec *abstime, int private) -{ - int result = 0; - if (__glibc_unlikely (atomic_compare_and_exchange_bool_acq (futex, 1, 0))) - result = __lll_timedlock_wait (futex, abstime, private); - return result; -} -#define lll_timedlock(futex, abstime, private) \ - __lll_timedlock (&(futex), abstime, private) - -#ifdef ENABLE_LOCK_ELISION +/* Transactional lock elision definitions. */ +# ifdef ENABLE_LOCK_ELISION extern int __lll_timedlock_elision (int *futex, short *adapt_count, const struct timespec *timeout, int private) attribute_hidden; -# define lll_timedlock_elision(futex, adapt_count, timeout, private) \ +# define lll_timedlock_elision(futex, adapt_count, timeout, private) \ __lll_timedlock_elision(&(futex), &(adapt_count), timeout, private) -#endif - -static inline int -__attribute__ ((always_inline)) -__lll_robust_timedlock (int *futex, const struct timespec *abstime, - int id, int private) -{ - int result = 0; - if (__builtin_expect (atomic_compare_and_exchange_bool_acq (futex, id, 0), - 0)) - result = __lll_robust_timedlock_wait (futex, abstime, private); - return result; -} -#define lll_robust_timedlock(futex, abstime, id, private) \ - __lll_robust_timedlock (&(futex), abstime, id, private) - - -#define __lll_unlock(futex, private) \ - (void) \ - ({ int __oldval; \ - int __newval = 0; \ - int *__futexp = (futex); \ - \ - lll_compare_and_swap (__futexp, __oldval, __newval, "slr %2,%2"); \ - if (__glibc_unlikely (__oldval > 1)) \ - lll_futex_wake (__futexp, 1, private); \ - }) -#define lll_unlock(futex, private) __lll_unlock(&(futex), private) - - -#define __lll_robust_unlock(futex, private) \ - (void) \ - ({ int __oldval; \ - int __newval = 0; \ - int *__futexp = (futex); \ - \ - lll_compare_and_swap (__futexp, __oldval, __newval, "slr %2,%2"); \ - if (__glibc_unlikely (__oldval & FUTEX_WAITERS)) \ - lll_futex_wake (__futexp, 1, private); \ - }) -#define lll_robust_unlock(futex, private) \ - __lll_robust_unlock(&(futex), private) - -#define lll_islocked(futex) \ - (futex != 0) - - -/* Initializers for lock. */ -#define LLL_LOCK_INITIALIZER (0) -#define LLL_LOCK_INITIALIZER_LOCKED (1) - -/* The kernel notifies a process which uses CLONE_CHILD_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(ptid) \ - do \ - { \ - int __tid; \ - \ - while ((__tid = *ptid) != 0) \ - lll_futex_wait (ptid, __tid, LLL_SHARED); \ - } \ - while (0) -#define lll_wait_tid(tid) __lll_wait_tid(&(tid)) - -extern int __lll_timedwait_tid (int *, const struct timespec *) - attribute_hidden; - -#define lll_timedwait_tid(tid, abstime) \ - ({ \ - int __res = 0; \ - if ((tid) != 0) \ - __res = __lll_timedwait_tid (&(tid), (abstime)); \ - __res; \ - }) -#ifdef ENABLE_LOCK_ELISION extern int __lll_lock_elision (int *futex, short *adapt_count, int private) attribute_hidden; @@ -354,12 +39,12 @@ extern int __lll_unlock_elision(int *futex, int private) extern int __lll_trylock_elision(int *futex, short *adapt_count) attribute_hidden; -# define lll_lock_elision(futex, adapt_count, private) \ +# define lll_lock_elision(futex, adapt_count, private) \ __lll_lock_elision (&(futex), &(adapt_count), private) -# define lll_unlock_elision(futex, private) \ +# define lll_unlock_elision(futex, private) \ __lll_unlock_elision (&(futex), private) -# define lll_trylock_elision(futex, adapt_count) \ +# define lll_trylock_elision(futex, adapt_count) \ __lll_trylock_elision(&(futex), &(adapt_count)) -#endif +# endif /* ENABLE_LOCK_ELISION */ #endif /* lowlevellock.h */ |