1 /* low level locking for pthread library. Generic futex-using version.
2 Copyright (C) 2003, 2005, 2007 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 #include <lowlevellock.h>
27 __lll_lock_wait_private (int *futex)
31 int oldval = atomic_compare_and_exchange_val_acq (futex, 2, 1);
33 lll_futex_wait (futex, 2, LLL_PRIVATE);
35 while (atomic_compare_and_exchange_bool_acq (futex, 2, 0) != 0);
39 /* These functions don't get included in libc.so */
40 #ifdef IS_IN_libpthread
42 __lll_lock_wait (int *futex, int private)
46 int oldval = atomic_compare_and_exchange_val_acq (futex, 2, 1);
48 lll_futex_wait (futex, 2, private);
50 while (atomic_compare_and_exchange_bool_acq (futex, 2, 0) != 0);
55 __lll_timedlock_wait (int *futex, const struct timespec *abstime, int private)
59 /* Reject invalid timeouts. */
60 if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
63 /* Upgrade the lock. */
64 if (atomic_exchange_acq (futex, 2) == 0)
71 /* Get the current time. */
72 (void) gettimeofday (&tv, NULL);
74 /* Compute relative timeout. */
75 rt.tv_sec = abstime->tv_sec - tv.tv_sec;
76 rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
79 rt.tv_nsec += 1000000000;
83 /* Already timed out? */
87 // XYZ: Lost the lock to check whether it was private.
88 lll_futex_timed_wait (futex, 2, &rt, private);
90 while (atomic_compare_and_exchange_bool_acq (futex, 2, 0) != 0);
97 __lll_timedwait_tid (int *tidp, const struct timespec *abstime)
101 if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
104 /* Repeat until thread terminated. */
105 while ((tid = *tidp) != 0)
110 /* Get the current time. */
111 (void) gettimeofday (&tv, NULL);
113 /* Compute relative timeout. */
114 rt.tv_sec = abstime->tv_sec - tv.tv_sec;
115 rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
118 rt.tv_nsec += 1000000000;
122 /* Already timed out? */
126 /* Wait until thread terminates. */
127 // XYZ: Lost the lock to check whether it was private.
128 if (lll_futex_timed_wait (tidp, tid, &rt, LLL_SHARED) == -ETIMEDOUT)