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NPTL: Conditionalize direct futex syscall uses.

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This commit is contained in:
Roland McGrath
2014-10-17 14:30:16 -07:00
parent 327ae25707
commit 184ee94010
7 changed files with 62 additions and 22 deletions
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13
nptl/pthread_mutex_lock.c
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@ -276,6 +276,10 @@ __pthread_mutex_lock_full (pthread_mutex_t *mutex)
THREAD_SETMEM (THREAD_SELF, robust_head.list_op_pending, NULL);
break;
/* The PI support requires the Linux futex system call. If that's not
available, pthread_mutex_init should never have allowed the type to
be set. So it will get the default case for an invalid type. */
#ifdef __NR_futex
case PTHREAD_MUTEX_PI_RECURSIVE_NP:
case PTHREAD_MUTEX_PI_ERRORCHECK_NP:
case PTHREAD_MUTEX_PI_NORMAL_NP:
@ -321,9 +325,9 @@ __pthread_mutex_lock_full (pthread_mutex_t *mutex)
}
int newval = id;
#ifdef NO_INCR
# ifdef NO_INCR
newval |= FUTEX_WAITERS;
#endif
# endif
oldval = atomic_compare_and_exchange_val_acq (&mutex->__data.__lock,
newval, 0);
@ -377,9 +381,9 @@ __pthread_mutex_lock_full (pthread_mutex_t *mutex)
incremented which is not correct because the old owner
has to be discounted. If we are not supposed to
increment __nusers we actually have to decrement it here. */
#ifdef NO_INCR
# ifdef NO_INCR
--mutex->__data.__nusers;
#endif
# endif
return EOWNERDEAD;
}
@ -409,6 +413,7 @@ __pthread_mutex_lock_full (pthread_mutex_t *mutex)
}
}
break;
#endif /* __NR_futex. */
case PTHREAD_MUTEX_PP_RECURSIVE_NP:
case PTHREAD_MUTEX_PP_ERRORCHECK_NP: