/* Timed low level locking for pthread library. Generic futex-using version. Copyright (C) 2003-2020 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 <https://www.gnu.org/licenses/>. */ #include <atomic.h> #include <errno.h> #include <lowlevellock.h> #include <sys/time.h> #include <time.h> int __lll_clocklock_wait (int *futex, int val, clockid_t clockid, const struct timespec *abstime, int private) { struct timespec ts, *tsp = NULL; if (abstime != NULL) { /* Reject invalid timeouts. */ if (! valid_nanoseconds (abstime->tv_nsec)) return EINVAL; /* Get the current time. This can only fail if clockid is not valid. */ if (__glibc_unlikely (__clock_gettime (clockid, &ts) != 0)) return EINVAL; /* Compute relative timeout. */ ts.tv_sec = abstime->tv_sec - ts.tv_sec; ts.tv_nsec = abstime->tv_nsec - ts.tv_nsec; if (ts.tv_nsec < 0) { ts.tv_nsec += 1000000000; --ts.tv_sec; } if (ts.tv_sec < 0) return ETIMEDOUT; tsp = &ts; } /* If *futex == val, wait until woken or timeout. */ lll_futex_timed_wait (futex, val, tsp, private); return 0; }