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, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include <lowlevellock.h>
26 #include <tcb-offsets.h>
30 __lll_lock_wait_private (int *futex)
33 lll_futex_wait (futex, 2, LLL_PRIVATE);
35 while (atomic_exchange_acq (futex, 2) != 0)
36 lll_futex_wait (futex, 2, LLL_PRIVATE);
40 /* These functions don't get included in libc.so */
41 #ifdef IS_IN_libpthread
43 __lll_lock_wait (int *futex, int private)
46 lll_futex_wait (futex, 2, private);
48 while (atomic_exchange_acq (futex, 2) != 0)
49 lll_futex_wait (futex, 2, private);
54 __lll_timedlock_wait (int *futex, const struct timespec *abstime, int private)
56 /* Reject invalid timeouts. */
57 if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
61 while (atomic_exchange_acq (futex, 2) != 0)
65 /* Get the current time. */
66 (void) gettimeofday (&tv, NULL);
68 /* Compute relative timeout. */
70 rt.tv_sec = abstime->tv_sec - tv.tv_sec;
71 rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
74 rt.tv_nsec += 1000000000;
82 lll_futex_timed_wait (futex, 2, &rt, private);
90 __lll_timedwait_tid (int *tidp, const struct timespec *abstime)
94 if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
97 /* Repeat until thread terminated. */
98 while ((tid = *tidp) != 0)
103 /* Get the current time. */
104 (void) __gettimeofday (&tv, NULL);
106 /* Compute relative timeout. */
107 rt.tv_sec = abstime->tv_sec - tv.tv_sec;
108 rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
111 rt.tv_nsec += 1000000000;
115 /* Already timed out? */
119 /* Wait until thread terminates. The kernel so far does not use
120 the private futex operations for this. */
121 if (lll_futex_timed_wait (tidp, tid, &rt, LLL_SHARED) == -ETIMEDOUT)