From d1e44df1fa5fefd8a083f6c1e909bbcdc97c6438 Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Fri, 17 Apr 2015 09:02:19 -0700 Subject: Add arm-nacl port. --- sysdeps/nacl/lowlevellock-futex.h | 87 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 sysdeps/nacl/lowlevellock-futex.h (limited to 'sysdeps/nacl/lowlevellock-futex.h') diff --git a/sysdeps/nacl/lowlevellock-futex.h b/sysdeps/nacl/lowlevellock-futex.h new file mode 100644 index 0000000000..8d888a2e72 --- /dev/null +++ b/sysdeps/nacl/lowlevellock-futex.h @@ -0,0 +1,87 @@ +/* Low-level locking access to futex facilities. NaCl version. + Copyright (C) 2015 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + . */ + +#ifndef _LOWLEVELLOCK_FUTEX_H +#define _LOWLEVELLOCK_FUTEX_H 1 + +#include +#include + + +#pragma GCC diagnostic ignored "-Wunused-value" /* XXX */ + +/* Values for 'private' parameter of locking macros. Note pthreadP.h + optimizes for these exact values, though they are not required. */ +#define LLL_PRIVATE 0 +#define LLL_SHARED 128 + +#define FUTEX_PRIVATE_FLAG 0 /* XXX */ + + +/* Wait while *FUTEXP == VAL for an lll_futex_wake call on FUTEXP. */ +#define lll_futex_wait(futexp, val, private) \ + (- __nacl_irt_futex.futex_wait_abs ((volatile int *) (futexp), val, NULL)) + +/* Wait until a lll_futex_wake call on FUTEXP, or TIMEOUT elapses. */ +#define lll_futex_timed_wait(futexp, val, timeout, private) \ + ({ \ + /* This timeout is relative, but the IRT call wants it absolute. */ \ + const struct timespec *_to = (timeout); \ + struct timespec _ts; \ + int _err = 0; \ + if (_to != NULL \ + && __glibc_likely ((_err = __nacl_irt_clock.clock_gettime \ + (CLOCK_REALTIME, &_ts)) == 0)) \ + { \ + _ts.tv_sec -= _to->tv_sec; \ + _ts.tv_nsec -= _to->tv_nsec; \ + while (_ts.tv_nsec < 0) \ + { \ + _ts.tv_nsec += 1000000000; \ + --_ts.tv_sec; \ + } \ + _to = &_ts; \ + } \ + if (_err == 0) \ + _err = __nacl_irt_futex.futex_wait_abs \ + ((volatile int *) (futexp), val, _to); \ + -_err; \ + }) + +/* Wake up up to NR waiters on FUTEXP. */ +#define lll_futex_wake(futexp, nr, private) \ + ({ \ + int _woken; \ + - __nacl_irt_futex.futex_wake ((volatile int *) (futexp), nr, &_woken); \ + }) + +/* NaCl does not support the requeue operation. The only use of this is in + pthread_cond_broadcast, which handles an error return by falling back to + plain lll_futex_wake. */ +#define lll_futex_requeue(futexp, nr_wake, nr_move, mutex, val, private) \ + ((futexp), (nr_wake), (nr_move), (mutex), (val), (private), -ENOSYS) + +/* NaCl does not support the special wake-unlock operation. The only use + of this is in pthread_cond_signal, which handles an error return by + falling back to plain lll_futex_wake. */ +/* Wake up up to NR_WAKE waiters on FUTEXP and NR_WAKE2 on FUTEXP2. */ +#define lll_futex_wake_unlock(futexp, nr_wake, nr_wake2, futexp2, private) \ + ((futexp), (nr_wake), (nr_wake2), (futexp2), (private), -ENOSYS) + + +#endif /* lowlevellock-futex.h */ -- cgit 1.4.1