From 3ed015122f159b4fade8e4feecb53fe1f84fa95f Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Thu, 28 May 2015 15:37:31 -0700 Subject: NaCl: Make thread exit wake pthread_join. --- sysdeps/nacl/lowlevellock.h | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 sysdeps/nacl/lowlevellock.h (limited to 'sysdeps/nacl/lowlevellock.h') diff --git a/sysdeps/nacl/lowlevellock.h b/sysdeps/nacl/lowlevellock.h new file mode 100644 index 0000000000..0b85d8d317 --- /dev/null +++ b/sysdeps/nacl/lowlevellock.h @@ -0,0 +1,45 @@ +/* Low-level lock implementation. 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_H + +/* Everything except the exit handling is the same as the generic code. */ +# include + +# ifndef BUSY_WAIT_NOP +# define BUSY_WAIT_NOP __sync_synchronize () +# endif + +/* See exit-thread.h for details. */ +# define NACL_EXITING_TID 1 + +# undef lll_wait_tid +# define lll_wait_tid(tid) \ + do { \ + __typeof (tid) __tid; \ + volatile __typeof (tid) *__tidp = &(tid); \ + while ((__tid = atomic_load_relaxed (__tidp)) != 0) \ + { \ + if (__tid == NACL_EXITING_TID) \ + BUSY_WAIT_NOP; \ + else \ + lll_futex_wait (__tidp, __tid, LLL_PRIVATE); \ + } \ + } while (0) + +#endif /* lowlevellock.h */ -- cgit 1.4.1