diff options
Diffstat (limited to 'sysdeps/nacl/lowlevellock.h')
-rw-r--r-- | sysdeps/nacl/lowlevellock.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/sysdeps/nacl/lowlevellock.h b/sysdeps/nacl/lowlevellock.h new file mode 100644 index 0000000..0b85d8d --- /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 + <http://www.gnu.org/licenses/>. */ + +#ifndef _LOWLEVELLOCK_H + +/* Everything except the exit handling is the same as the generic code. */ +# include <sysdeps/nptl/lowlevellock.h> + +# 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 */ |