diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/futex-internal.h')
| -rw-r--r-- | sysdeps/unix/sysv/linux/futex-internal.h | 255 |
1 files changed, 0 insertions, 255 deletions
diff --git a/sysdeps/unix/sysv/linux/futex-internal.h b/sysdeps/unix/sysv/linux/futex-internal.h deleted file mode 100644 index 5a4f4ff818..0000000000 --- a/sysdeps/unix/sysv/linux/futex-internal.h +++ /dev/null @@ -1,255 +0,0 @@ -/* futex operations for glibc-internal use. Linux version. - Copyright (C) 2014-2019 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - 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/>. */ - -#ifndef FUTEX_INTERNAL_H -#define FUTEX_INTERNAL_H - -#include <sysdeps/nptl/futex-internal.h> -#include <errno.h> -#include <lowlevellock-futex.h> -#include <sysdep-cancel.h> - -/* See sysdeps/nptl/futex-internal.h for documentation; this file only - contains Linux-specific comments. - - The Linux kernel treats provides absolute timeouts based on the - CLOCK_REALTIME clock and relative timeouts measured against the - CLOCK_MONOTONIC clock. - - We expect a Linux kernel version of 2.6.22 or more recent (since this - version, EINTR is not returned on spurious wake-ups anymore). */ - -/* FUTEX_SHARED is always supported by the Linux kernel. */ -static __always_inline int -futex_supports_pshared (int pshared) -{ - if (__glibc_likely (pshared == PTHREAD_PROCESS_PRIVATE)) - return 0; - else if (pshared == PTHREAD_PROCESS_SHARED) - return 0; - else - return EINVAL; -} - -/* See sysdeps/nptl/futex-internal.h for details. */ -static __always_inline int -futex_wait (unsigned int *futex_word, unsigned int expected, int private) -{ - int err = lll_futex_timed_wait (futex_word, expected, NULL, private); - switch (err) - { - case 0: - case -EAGAIN: - case -EINTR: - return -err; - - case -ETIMEDOUT: /* Cannot have happened as we provided no timeout. */ - case -EFAULT: /* Must have been caused by a glibc or application bug. */ - case -EINVAL: /* Either due to wrong alignment or due to the timeout not - being normalized. Must have been caused by a glibc or - application bug. */ - case -ENOSYS: /* Must have been caused by a glibc bug. */ - /* No other errors are documented at this time. */ - default: - futex_fatal_error (); - } -} - -/* See sysdeps/nptl/futex-internal.h for details. */ -static __always_inline int -futex_wait_cancelable (unsigned int *futex_word, unsigned int expected, - int private) -{ - int oldtype; - oldtype = __pthread_enable_asynccancel (); - int err = lll_futex_timed_wait (futex_word, expected, NULL, private); - __pthread_disable_asynccancel (oldtype); - switch (err) - { - case 0: - case -EAGAIN: - case -EINTR: - return -err; - - case -ETIMEDOUT: /* Cannot have happened as we provided no timeout. */ - case -EFAULT: /* Must have been caused by a glibc or application bug. */ - case -EINVAL: /* Either due to wrong alignment or due to the timeout not - being normalized. Must have been caused by a glibc or - application bug. */ - case -ENOSYS: /* Must have been caused by a glibc bug. */ - /* No other errors are documented at this time. */ - default: - futex_fatal_error (); - } -} - -/* See sysdeps/nptl/futex-internal.h for details. */ -static __always_inline int -futex_reltimed_wait (unsigned int *futex_word, unsigned int expected, - const struct timespec *reltime, int private) -{ - int err = lll_futex_timed_wait (futex_word, expected, reltime, private); - switch (err) - { - case 0: - case -EAGAIN: - case -EINTR: - case -ETIMEDOUT: - return -err; - - case -EFAULT: /* Must have been caused by a glibc or application bug. */ - case -EINVAL: /* Either due to wrong alignment or due to the timeout not - being normalized. Must have been caused by a glibc or - application bug. */ - case -ENOSYS: /* Must have been caused by a glibc bug. */ - /* No other errors are documented at this time. */ - default: - futex_fatal_error (); - } -} - -/* See sysdeps/nptl/futex-internal.h for details. */ -static __always_inline int -futex_reltimed_wait_cancelable (unsigned int *futex_word, - unsigned int expected, - const struct timespec *reltime, int private) -{ - int oldtype; - oldtype = LIBC_CANCEL_ASYNC (); - int err = lll_futex_timed_wait (futex_word, expected, reltime, private); - LIBC_CANCEL_RESET (oldtype); - switch (err) - { - case 0: - case -EAGAIN: - case -EINTR: - case -ETIMEDOUT: - return -err; - - case -EFAULT: /* Must have been caused by a glibc or application bug. */ - case -EINVAL: /* Either due to wrong alignment or due to the timeout not - being normalized. Must have been caused by a glibc or - application bug. */ - case -ENOSYS: /* Must have been caused by a glibc bug. */ - /* No other errors are documented at this time. */ - default: - futex_fatal_error (); - } -} - -/* See sysdeps/nptl/futex-internal.h for details. */ -static __always_inline int -futex_abstimed_supported_clockid (clockid_t clockid) -{ - return lll_futex_supported_clockid (clockid); -} - -/* See sysdeps/nptl/futex-internal.h for details. */ -static __always_inline int -futex_abstimed_wait (unsigned int *futex_word, unsigned int expected, - clockid_t clockid, - const struct timespec *abstime, int private) -{ - /* Work around the fact that the kernel rejects negative timeout values - despite them being valid. */ - if (__glibc_unlikely ((abstime != NULL) && (abstime->tv_sec < 0))) - return ETIMEDOUT; - int err = lll_futex_clock_wait_bitset (futex_word, expected, - clockid, abstime, - private); - switch (err) - { - case 0: - case -EAGAIN: - case -EINTR: - case -ETIMEDOUT: - return -err; - - case -EFAULT: /* Must have been caused by a glibc or application bug. */ - case -EINVAL: /* Either due to wrong alignment, unsupported - clockid or due to the timeout not being - normalized. Must have been caused by a glibc or - application bug. */ - case -ENOSYS: /* Must have been caused by a glibc bug. */ - /* No other errors are documented at this time. */ - default: - futex_fatal_error (); - } -} - -/* See sysdeps/nptl/futex-internal.h for details. */ -static __always_inline int -futex_abstimed_wait_cancelable (unsigned int *futex_word, - unsigned int expected, - clockid_t clockid, - const struct timespec *abstime, int private) -{ - /* Work around the fact that the kernel rejects negative timeout values - despite them being valid. */ - if (__glibc_unlikely ((abstime != NULL) && (abstime->tv_sec < 0))) - return ETIMEDOUT; - int oldtype; - oldtype = __pthread_enable_asynccancel (); - int err = lll_futex_clock_wait_bitset (futex_word, expected, - clockid, abstime, - private); - __pthread_disable_asynccancel (oldtype); - switch (err) - { - case 0: - case -EAGAIN: - case -EINTR: - case -ETIMEDOUT: - return -err; - - case -EFAULT: /* Must have been caused by a glibc or application bug. */ - case -EINVAL: /* Either due to wrong alignment or due to the timeout not - being normalized. Must have been caused by a glibc or - application bug. */ - case -ENOSYS: /* Must have been caused by a glibc bug. */ - /* No other errors are documented at this time. */ - default: - futex_fatal_error (); - } -} - -/* See sysdeps/nptl/futex-internal.h for details. */ -static __always_inline void -futex_wake (unsigned int *futex_word, int processes_to_wake, int private) -{ - int res = lll_futex_wake (futex_word, processes_to_wake, private); - /* No error. Ignore the number of woken processes. */ - if (res >= 0) - return; - switch (res) - { - case -EFAULT: /* Could have happened due to memory reuse. */ - case -EINVAL: /* Could be either due to incorrect alignment (a bug in - glibc or in the application) or due to memory being - reused for a PI futex. We cannot distinguish between the - two causes, and one of them is correct use, so we do not - act in this case. */ - return; - case -ENOSYS: /* Must have been caused by a glibc bug. */ - /* No other errors are documented at this time. */ - default: - futex_fatal_error (); - } -} - -#endif /* futex-internal.h */ |