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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | /* low level locking for pthread library. SPARC version. Copyright (C) 2003, 2006, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. 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/>. */ #include <errno.h> #include <sysdep.h> #include <lowlevellock.h> #include <sys/time.h> #include <tls.h> void #ifndef IS_IN_libpthread weak_function #endif __lll_lock_wait_private (int *futex) { do { int oldval = atomic_compare_and_exchange_val_24_acq (futex, 2, 1); if (oldval != 0) lll_futex_wait (futex, 2, LLL_PRIVATE); } while (atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0); } /* These functions don't get included in libc.so */ #ifdef IS_IN_libpthread void __lll_lock_wait (int *futex, int private) { do { int oldval = atomic_compare_and_exchange_val_24_acq (futex, 2, 1); if (oldval != 0) lll_futex_wait (futex, 2, private); } while (atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0); } int __lll_timedlock_wait (int *futex, const struct timespec *abstime, int private) { /* Reject invalid timeouts. */ if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) return EINVAL; do { struct timeval tv; struct timespec rt; /* Get the current time. */ (void) gettimeofday (&tv, NULL); /* Compute relative timeout. */ rt.tv_sec = abstime->tv_sec - tv.tv_sec; rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000; if (rt.tv_nsec < 0) { rt.tv_nsec += 1000000000; --rt.tv_sec; } /* Already timed out? */ if (rt.tv_sec < 0) return ETIMEDOUT; /* Wait. */ int oldval = atomic_compare_and_exchange_val_24_acq (futex, 2, 1); if (oldval != 0) lll_futex_timed_wait (futex, 2, &rt, private); } while (atomic_compare_and_exchange_val_24_acq (futex, 2, 0) != 0); return 0; } int __lll_timedwait_tid (int *tidp, const struct timespec *abstime) { int tid; if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) return EINVAL; /* Repeat until thread terminated. */ while ((tid = *tidp) != 0) { struct timeval tv; struct timespec rt; /* Get the current time. */ (void) gettimeofday (&tv, NULL); /* Compute relative timeout. */ rt.tv_sec = abstime->tv_sec - tv.tv_sec; rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000; if (rt.tv_nsec < 0) { rt.tv_nsec += 1000000000; --rt.tv_sec; } /* Already timed out? */ if (rt.tv_sec < 0) return ETIMEDOUT; /* Wait until thread terminates. The kernel so far does not use the private futex operations for this. */ if (lll_futex_timed_wait (tidp, tid, &rt, LLL_SHARED) == -ETIMEDOUT) return ETIMEDOUT; } return 0; } #endif |