Update.
* sysdeps/unix/sysv/linux/ia64/lowlevellock.h: Likewise. * sysdeps/unix/sysv/linux/powerpc/lowlevellock.h: Likewise. * sysdeps/unix/sysv/linux/lowlevellock.c: Likewise. * sysdeps/pthread/pthread_cond_signal.c: Don't use requeue.
This commit is contained in:
Ulrich Drepper
parent
3a226d3301
commit
bc1989aad2
@ -4,9 +4,12 @@
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locking macros. No distinction between normal and mutex locking
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anymore.
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* sysdeps/unix/sysv/linux/x86_64/lowlevellock.h: Likewise.
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* sysdeps/unix/sysv/linux/ia64/lowlevellock.h: Likewise.
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* sysdeps/unix/sysv/linux/powerpc/lowlevellock.h: Likewise.
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* sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S: Rewrite mutex
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locking. Merge bits from lowlevelmutex.S we still need.
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* sysdeps/unix/sysv/linux/x86_64/lowlevellock.S: Likewise.
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* sysdeps/unix/sysv/linux/lowlevellock.c: Likewise.
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* sysdeps/unix/sysv/linux/i386/i486/lowlevelmutex.S: Removed.
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* sysdeps/unix/sysv/linux/x86_64/lowlevelmutex.S: Removed.
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* Makefile (routines): Remove libc-lowlevelmutex.
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@ -37,6 +40,7 @@
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* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_signal.S: Likewise.
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Don't use requeue.
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* sysdeps/unix/sysv/linux/x86_64/pthread_cond_signal.S: Likewise.
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* sysdeps/pthread/pthread_cond_signal.c: Don't use requeue.
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2003-09-20 Ulrich Drepper <drepper@redhat.com>
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@ -52,22 +52,7 @@ __pthread_cond_signal (cond)
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#endif
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/* Wake one. */
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int r = lll_futex_requeue (futex, 0, 1, &cond->__data.__lock);
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if (__builtin_expect (r == -EINVAL, 0))
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{
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/* The requeue functionality is not available. */
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#ifndef __ASSUME_FUTEX_REQUEUE
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lll_futex_wake (futex, 1);
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#endif
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}
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else if (r != 0)
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{
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/* We always have to make the syscall if requeue actually
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moved a thread. */
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lll_mutex_unlock_force (cond->__data.__lock);
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return 0;
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}
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lll_futex_wake (futex, 1);
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}
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/* We are done. */
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@ -127,10 +127,8 @@ static inline void
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__attribute__ ((always_inline))
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__lll_mutex_lock (int *futex)
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{
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int val = atomic_exchange_and_add (futex, 1);
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if (__builtin_expect (val != 0, 0))
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__lll_lock_wait (futex, val);
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if (atomic_compare_and_exchange_bool_acq (futex, 1, 0) != 0)
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__lll_lock_wait (futex);
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}
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#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex))
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@ -139,13 +137,8 @@ static inline void
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__attribute__ ((always_inline))
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__lll_mutex_cond_lock (int *futex)
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{
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int val = atomic_exchange_and_add (futex, 2);
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if (__builtin_expect (val != 0, 0))
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/* Note, the val + 1 is kind of ugly here. __lll_lock_wait will add
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1 again. But we added 2 to the futex value so this is the right
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value which will be passed to the kernel. */
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__lll_lock_wait (futex, val + 1);
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if (atomic_compare_and_exchange_bool_acq (futex, 2, 0) != 0)
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__lll_lock_wait (futex);
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}
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#define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex))
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@ -158,11 +151,10 @@ static inline int
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__attribute__ ((always_inline))
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__lll_mutex_timedlock (int *futex, const struct timespec *abstime)
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{
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int val = atomic_exchange_and_add (futex, 1);
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int result = 0;
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if (__builtin_expect (val != 0, 0))
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result = __lll_timedlock_wait (futex, val, abstime);
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if (atomic_compare_and_exchange_bool_acq (futex, 1, 0) != 0)
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result = __lll_timedlock_wait (futex, abstime);
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return result;
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}
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@ -25,22 +25,20 @@
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void
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__lll_lock_wait (int *futex, int val)
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__lll_lock_wait (int *futex)
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{
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/* In the loop we are going to add 2 instead of 1 which is what
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the caller did. Account for that. */
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--val;
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do
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{
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lll_futex_wait (futex, val + 2);
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val = atomic_exchange_and_add (futex, 2);
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int oldval = atomic_compare_and_exchange_val_acq (futex, 2, 1);
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if (oldval != 0)
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lll_futex_wait (futex, 2);
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}
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while (val != 0);
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while (atomic_compare_and_exchange_bool_acq (futex, 2, 0) != 0);
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}
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int
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__lll_timedlock_wait (int *futex, int val, const struct timespec *abstime)
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__lll_timedlock_wait (int *futex, const struct timespec *abstime)
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{
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/* Reject invalid timeouts. */
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if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
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@ -68,12 +66,12 @@ __lll_timedlock_wait (int *futex, int val, const struct timespec *abstime)
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return ETIMEDOUT;
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/* Wait. */
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if (lll_futex_timed_wait (futex, val + 1, &rt) == -ETIMEDOUT)
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return ETIMEDOUT;
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int oldval = atomic_compare_and_exchange_val_acq (futex, 2, 1);
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if (oldval != 0)
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lll_futex_wait (futex, 2);
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}
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while ((val = atomic_exchange_and_add (futex, 1)) != 0);
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while (atomic_compare_and_exchange_bool_acq (futex, 2, 0) != 0);
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*futex = 2;
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return 0;
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}
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@ -106,34 +106,25 @@ extern void __lll_lock_wait (int *futex, int val) attribute_hidden;
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#define lll_mutex_lock(lock) \
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(void) ({ \
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int *__futex = &(lock); \
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int __val = atomic_exchange_and_add (__futex, 1); \
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__asm __volatile (__lll_acq_instr ::: "memory"); \
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if (__builtin_expect (__val != 0, 0)) \
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__lll_lock_wait (__futex, __val); \
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if (atomic_compare_and_exchange_bool_acq (__futex, 1, 0) != 0) \
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__lll_lock_wait (__futex); \
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})
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#define lll_mutex_cond_lock(lock) \
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(void) ({ \
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int *__futex = &(lock); \
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int __val = atomic_exchange_and_add (__futex, 2); \
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__asm __volatile (__lll_acq_instr ::: "memory"); \
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if (__builtin_expect (__val != 0, 0)) \
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/* Note, the val + 1 is kind of ugly here. __lll_lock_wait will add \
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1 again. But we added 2 to the futex value so this is the right \
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value which will be passed to the kernel. */ \
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__lll_lock_wait (__futex, __val + 1); \
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if (atomic_compare_and_exchange_bool_acq (__futex, 2, 0) != 0) \
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__lll_lock_wait (__futex); \
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})
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extern int __lll_timedlock_wait
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(int *futex, int val, const struct timespec *) attribute_hidden;
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#define lll_mutex_timedlock(lock, abstime) \
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({ int *__futex = &(lock); \
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int __val = atomic_exchange_and_add (__futex, 1); \
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__asm __volatile (__lll_acq_instr ::: "memory"); \
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if (__builtin_expect (__val != 0, 0)) \
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__val = __lll_timedlock_wait (__futex, __val, (abstime)); \
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__val; \
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(void) ({ \
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int *__futex = &(lock); \
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if (atomic_compare_and_exchange_bool_acq (__futex, 1, 0) != 0) \
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__lll_timedlock_wait (__futex, abstime); \
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})
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#define lll_mutex_unlock(lock) \
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