diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/lowlevellock.c')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/lowlevellock.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/lowlevellock.c b/nptl/sysdeps/unix/sysv/linux/lowlevellock.c new file mode 100644 index 0000000000..b80e15337f --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/lowlevellock.c @@ -0,0 +1,140 @@ +/* low level locking for pthread library. Generic futex-using version. + Copyright (C) 2003 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <errno.h> +#include <sysdep.h> +#include <lowlevellock.h> +#include <sys/time.h> + + +void +__lll_lock_wait (int *futex, int val) +{ + do { + lll_futex_wait (futex, val+1); + } while ((val = __lll_add (futex, 1)) != 0); + *futex = 2; +} +hidden_proto (__lll_lock_wait) + + +int +__lll_timedlock_wait (int *futex, int val, const struct timespec *abstime) +{ + int err; + + /* Reject invalid timeouts. */ + if (abstime->tv_nsec >= 1000000000) + return EINVAL; + + do + { + struct timeval tv; + struct timespec rt; + int sec, nsec; + + /* Get the current time. */ + __gettimeofday (&tv, NULL); + + /* Compute relative timeout. */ + sec = abstime->tv_sec - tv.tv_sec; + nsec = abstime->tv_nsec - tv.tv_usec * 1000; + if (nsec < 0) + { + nsec += 1000000000; + --sec; + } + + /* Already timed out? */ + err = -ETIMEDOUT; + if (sec < 0) + break; + + /* Wait. */ + rt.tv_sec = sec; + rt.tv_nsec = nsec; + err = lll_futex_timed_wait (futex, val+1, &rt); + } while (err == 0 && (val = __lll_add (futex, 1)) != 0); + + *futex = 2; + return -err; +} +hidden_proto (__lll_timedlock_wait) + + +/* These don't get included in libc.so */ +#ifdef IS_IN_libpthread +int +lll_unlock_wake_cb (int *futex) +{ + __lll_add (futex, 1); + return 0; +} +hidden_proto (lll_unlock_wake_cb) + + +int +__lll_timedwait_tid (int *tidp, const struct timespec *abstime) +{ + int tid; + int err = 0; + + if (abstime == NULL || abstime->tv_nsec >= 1000000000) + return EINVAL; + + /* Repeat until thread terminated. */ + while ((tid = *tidp) != 0) + { + struct timeval tv; + struct timespec rt; + int sec, nsec; + + /* Get the current time. */ + __gettimeofday (&tv, NULL); + + /* Compute relative timeout. */ + sec = abstime->tv_sec - tv.tv_sec; + nsec = abstime->tv_nsec - tv.tv_usec * 1000; + if (nsec < 0) + { + nsec += 1000000000; + --sec; + } + + /* Already timed out? */ + err = -ETIMEDOUT; + if (sec < 0) + break; + + /* Wait. */ + rt.tv_sec = sec; + rt.tv_nsec = nsec; + + /* Wait until thread terminates. */ + err = lll_futex_timed_wait (tidp, tid, &rt); + if (err != 0) + break; + } + + return -err; +} + +hidden_proto (__lll_timedwait_tid) +#endif |