1 /* low level locking for pthread library. Generic futex-using version.
2 Copyright (C) 2003, 2007 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
22 #include <lowlevellock.h>
25 #include <tcb-offsets.h>
29 __lll_lock_wait_private (int *futex)
32 lll_futex_wait (futex, 2, LLL_PRIVATE);
34 while (atomic_exchange_acq (futex, 2) != 0)
35 lll_futex_wait (futex, 2, LLL_PRIVATE);
39 /* These functions don't get included in libc.so */
40 #ifdef IS_IN_libpthread
42 __lll_lock_wait (int *futex, int private)
45 lll_futex_wait (futex, 2, private);
47 while (atomic_exchange_acq (futex, 2) != 0)
48 lll_futex_wait (futex, 2, private);
53 __lll_timedlock_wait (int *futex, const struct timespec *abstime, int private)
55 /* Reject invalid timeouts. */
56 if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
60 while (atomic_exchange_acq (futex, 2) != 0)
64 /* Get the current time. */
65 (void) gettimeofday (&tv, NULL);
67 /* Compute relative timeout. */
69 rt.tv_sec = abstime->tv_sec - tv.tv_sec;
70 rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
73 rt.tv_nsec += 1000000000;
81 lll_futex_timed_wait (futex, 2, &rt, private);
89 __lll_timedwait_tid (int *tidp, const struct timespec *abstime)
93 if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
96 /* Repeat until thread terminated. */
97 while ((tid = *tidp) != 0)
102 /* Get the current time. */
103 (void) __gettimeofday (&tv, NULL);
105 /* Compute relative timeout. */
106 rt.tv_sec = abstime->tv_sec - tv.tv_sec;
107 rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
110 rt.tv_nsec += 1000000000;
114 /* Already timed out? */
118 /* Wait until thread terminates. The kernel so far does not use
119 the private futex operations for this. */
120 if (lll_futex_timed_wait (tidp, tid, &rt, LLL_SHARED) == -ETIMEDOUT)