[PATCH v2 1/3] y2038: Convert cnd_timedwait to support 64 bit time

[PATCH v2 1/3] y2038: Convert cnd_timedwait to support 64 bit time

[Lukasz Majewski]

The cnd_timedwait function has been converted to support 64 bit time.
It was also necessary to provide Linux specific copy of it to avoid
problems on i686-gnu (i.e. HURD) port, which is not providing
pthread_cond_timedwait() supporting 64 bit time.

Moreover, a linux specific copy of thrd_priv.h header file has been
added as well.

The cnd_timedwait is a wrapper on POSIX threads to provide C11 standard
threads interface. It directly calls __pthread_cond_timedwait64().

Build tests:
./src/scripts/build-many-glibcs.py glibcs
---
Changes for v2:
- Create linux specific version of thrd_priv.h

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
 sysdeps/unix/sysv/linux/cnd_timedwait.c | 44 +++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/thrd_priv.h     | 27 +++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/cnd_timedwait.c
 create mode 100644 sysdeps/unix/sysv/linux/thrd_priv.h

diff --git a/sysdeps/unix/sysv/linux/cnd_timedwait.c b/sysdeps/unix/sysv/linux/cnd_timedwait.c
new file mode 100644
index 0000000000..5bf5a2d968
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/cnd_timedwait.c
@@ -0,0 +1,44 @@
+/* C11 threads conditional timed wait implementation - Linux variant.
+   Copyright (C) 2020 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/>.  */
+
+#include <time.h>
+#include "thrd_priv.h"
+
+int
+__cnd_timedwait64 (cnd_t *restrict cond, mtx_t *restrict mutex,
+                   const struct __timespec64* restrict time_point)
+{
+  int err_code = __pthread_cond_timedwait64 ((pthread_cond_t *) cond,
+                                             (pthread_mutex_t *) mutex,
+                                             time_point);
+  return thrd_err_map (err_code);
+}
+
+#if __TIMESIZE != 64
+libpthread_hidden_def (__cnd_timedwait64)
+
+int
+__cnd_timedwait (cnd_t *restrict cond, mtx_t *restrict mutex,
+                 const struct timespec* restrict time_point)
+{
+  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*time_point);
+
+  return __cnd_timedwait64(cond, mutex, &ts64);
+}
+#endif
+weak_alias (__cnd_timedwait, cnd_timedwait)
diff --git a/sysdeps/unix/sysv/linux/thrd_priv.h b/sysdeps/unix/sysv/linux/thrd_priv.h
new file mode 100644
index 0000000000..5ca0d7a1d9
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/thrd_priv.h
@@ -0,0 +1,27 @@
+/* Internal C11 threads definitions - linux version
+   Copyright (C) 2020 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/>.  */
+
+#include <sysdeps/pthread/thrd_priv.h>
+
+#if __TIMESIZE == 64
+# define __cnd_timedwait64 __cnd_timedwait
+#else
+extern int __cnd_timedwait64 (cnd_t *restrict cond, mtx_t *restrict mutex,
+                              const struct __timespec64* restrict time_point);
+libpthread_hidden_proto (__cnd_timedwait64)
+#endif
-- 
2.20.1

[PATCH v2 2/3] y2038: Convert mtx_timedlock to support 64 bit time

[Lukasz Majewski]

The mtx_timedlock function has been converted to support 64 bit time.
It was also necessary to provide Linux specific copy of it to avoid
problems on i686-gnu (i.e. HURD) port, which is not providing
pthread_mutex_timedlock() supporting 64 bit time.

The mtx_timedlock is a wrapper on POSIX threads to provide C11 standard
threads interface. It directly calls __pthread_mutex_timedlock64().

Build tests:
./src/scripts/build-many-glibcs.py glibcs
---
Changes for v2:
- Add aliasing and __mtx_timedlock64 definition to linux specific
  version of thrd_priv.h
- Add missing space in __mtx_timedlock64 (mutex, &ts64);

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
 sysdeps/unix/sysv/linux/mtx_timedlock.c | 43 +++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/thrd_priv.h     |  4 +++
 2 files changed, 47 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/mtx_timedlock.c

diff --git a/sysdeps/unix/sysv/linux/mtx_timedlock.c b/sysdeps/unix/sysv/linux/mtx_timedlock.c
new file mode 100644
index 0000000000..8dde1d30d4
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mtx_timedlock.c
@@ -0,0 +1,43 @@
+/* C11 threads mutex timed lock implementation - Linux variant.
+   Copyright (C) 2020 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/>.  */
+
+#include <time.h>
+#include "thrd_priv.h"
+
+int
+__mtx_timedlock64 (mtx_t *restrict mutex,
+                   const struct __timespec64 *restrict time_point)
+{
+  int err_code = __pthread_mutex_timedlock64 ((pthread_mutex_t *)mutex,
+                                              time_point);
+  return thrd_err_map (err_code);
+}
+
+#if __TIMESIZE != 64
+libpthread_hidden_def (__mtx_timedlock64)
+
+int
+__mtx_timedlock (mtx_t *restrict mutex,
+                 const struct timespec *restrict time_point)
+{
+  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*time_point);
+
+  return __mtx_timedlock64 (mutex, &ts64);
+}
+#endif
+weak_alias (__mtx_timedlock, mtx_timedlock)
diff --git a/sysdeps/unix/sysv/linux/thrd_priv.h b/sysdeps/unix/sysv/linux/thrd_priv.h
index 5ca0d7a1d9..d7851f0986 100644
--- a/sysdeps/unix/sysv/linux/thrd_priv.h
+++ b/sysdeps/unix/sysv/linux/thrd_priv.h
@@ -20,8 +20,12 @@
 
 #if __TIMESIZE == 64
 # define __cnd_timedwait64 __cnd_timedwait
+# define __mtx_timedlock64 __mtx_timedlock
 #else
 extern int __cnd_timedwait64 (cnd_t *restrict cond, mtx_t *restrict mutex,
                               const struct __timespec64* restrict time_point);
 libpthread_hidden_proto (__cnd_timedwait64)
+extern int __mtx_timedlock64 (mtx_t *restrict mutex,
+                              const struct __timespec64 *restrict time_point);
+libpthread_hidden_proto (__mtx_timedlock64)
 #endif
-- 
2.20.1

[PATCH v2 3/3] y2038: Convert thrd_sleep to support 64 bit time

[Lukasz Majewski]

The thrd_sleep function has been converted to support 64 bit time.
It was also necessary to provide Linux specific copy of it to avoid
problems on i686-gnu (i.e. HURD) port, which is not providing
clock_nanosleep() supporting 64 bit time.

The thrd_sleep is a wrapper on POSIX threads to provide C11 standard
threads interface. It directly calls __clock_nanosleep64().

Build tests:
./src/scripts/build-many-glibcs.py glibcs
---
Changes for v2:
- Add aliasing and __thrd_sleep64 definition to linux specific
  version of thrd_priv.h
- Reformat the thrd_sleep.c to not exceed the line width

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
---
 sysdeps/unix/sysv/linux/thrd_priv.h  |  4 ++
 sysdeps/unix/sysv/linux/thrd_sleep.c | 56 ++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/thrd_sleep.c

diff --git a/sysdeps/unix/sysv/linux/thrd_priv.h b/sysdeps/unix/sysv/linux/thrd_priv.h
index d7851f0986..3cfb529c2a 100644
--- a/sysdeps/unix/sysv/linux/thrd_priv.h
+++ b/sysdeps/unix/sysv/linux/thrd_priv.h
@@ -21,6 +21,7 @@
 #if __TIMESIZE == 64
 # define __cnd_timedwait64 __cnd_timedwait
 # define __mtx_timedlock64 __mtx_timedlock
+# define __thrd_sleep64 __thrd_sleep
 #else
 extern int __cnd_timedwait64 (cnd_t *restrict cond, mtx_t *restrict mutex,
                               const struct __timespec64* restrict time_point);
@@ -28,4 +29,7 @@ libpthread_hidden_proto (__cnd_timedwait64)
 extern int __mtx_timedlock64 (mtx_t *restrict mutex,
                               const struct __timespec64 *restrict time_point);
 libpthread_hidden_proto (__mtx_timedlock64)
+extern int __thrd_sleep64 (const struct __timespec64* time_point,
+                           struct __timespec64* remaining);
+libpthread_hidden_proto (__thrd_sleep64)
 #endif
diff --git a/sysdeps/unix/sysv/linux/thrd_sleep.c b/sysdeps/unix/sysv/linux/thrd_sleep.c
new file mode 100644
index 0000000000..32dbf2b772
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/thrd_sleep.c
@@ -0,0 +1,56 @@
+/* C11 threads thread sleep implementation - Linux variant.
+   Copyright (C) 2020 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/>.  */
+
+#include <time.h>
+#include <sysdep-cancel.h>
+
+#include "thrd_priv.h"
+
+int
+__thrd_sleep64 (const struct __timespec64* time_point,
+                struct __timespec64* remaining)
+{
+  int ret = __clock_nanosleep_time64 (CLOCK_REALTIME, 0, time_point,
+                                      remaining);
+  /* C11 states thrd_sleep function returns -1 if it has been interrupted
+     by a signal, or a negative value if it fails.  */
+  switch (ret)
+  {
+     case 0:      return 0;
+     case EINTR:  return -1;
+     default:     return -2;
+  }
+}
+
+#if __TIMESIZE != 64
+libpthread_hidden_def (__thrd_sleep64)
+
+int
+__thrd_sleep (const struct timespec* time_point, struct timespec* remaining)
+{
+  const struct __timespec64 treq64 = valid_timespec_to_timespec64 (*time_point);
+  struct __timespec64 trem64;
+
+  int ret = __thrd_sleep64 (&treq64, &trem64);
+  if (ret == -1 && remaining != NULL)
+    *remaining = valid_timespec64_to_timespec (trem64);
+
+  return ret;
+}
+#endif
+weak_alias (__thrd_sleep, thrd_sleep)
-- 
2.20.1

Re: [PATCH v2 3/3] y2038: Convert thrd_sleep to support 64 bit time

[Andreas Schwab]

On Nov 12 2020, Lukasz Majewski wrote:

> @@ -28,4 +29,7 @@ libpthread_hidden_proto (__cnd_timedwait64)
>  extern int __mtx_timedlock64 (mtx_t *restrict mutex,
>                                const struct __timespec64 *restrict time_point);
>  libpthread_hidden_proto (__mtx_timedlock64)
> +extern int __thrd_sleep64 (const struct __timespec64* time_point,
> +                           struct __timespec64* remaining);

Style: space before asterisk, not after.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."

Re: [PATCH v2 3/3] y2038: Convert thrd_sleep to support 64 bit time

[Andreas Schwab]

On Nov 12 2020, Lukasz Majewski wrote:

> +int
> +__thrd_sleep (const struct timespec* time_point, struct timespec* remaining)
> +{
> +  const struct __timespec64 treq64 = valid_timespec_to_timespec64 (*time_point);
> +  struct __timespec64 trem64;
> +
> +  int ret = __thrd_sleep64 (&treq64, &trem64);
> +  if (ret == -1 && remaining != NULL)
> +    *remaining = valid_timespec64_to_timespec (trem64);

If remaining is NULL then __thrd_sleep64 should probably be called with
NULL.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."

Re: [PATCH v2 2/3] y2038: Convert mtx_timedlock to support 64 bit time

[Adhemerval Zanella]

On 03/11/2020 06:14, Lukasz Majewski wrote:
> The mtx_timedlock function has been converted to support 64 bit time.
> It was also necessary to provide Linux specific copy of it to avoid
> problems on i686-gnu (i.e. HURD) port, which is not providing
> pthread_mutex_timedlock() supporting 64 bit time.
> 
> The mtx_timedlock is a wrapper on POSIX threads to provide C11 standard
> threads interface. It directly calls __pthread_mutex_timedlock64().
> 
> Build tests:
> ./src/scripts/build-many-glibcs.py glibcs
> ---
>  sysdeps/pthread/thrd_priv.h             |  4 +++
>  sysdeps/unix/sysv/linux/mtx_timedlock.c | 43 +++++++++++++++++++++++++
>  2 files changed, 47 insertions(+)
>  create mode 100644 sysdeps/unix/sysv/linux/mtx_timedlock.c
> 
> diff --git a/sysdeps/pthread/thrd_priv.h b/sysdeps/pthread/thrd_priv.h
> index dbfec0df7a..efe453bdec 100644
> --- a/sysdeps/pthread/thrd_priv.h
> +++ b/sysdeps/pthread/thrd_priv.h
> @@ -26,10 +26,14 @@
>  
>  #if __TIMESIZE == 64
>  # define __cnd_timedwait64 __cnd_timedwait
> +# define __mtx_timedlock64 __mtx_timedlock
>  #else
>  extern int __cnd_timedwait64 (cnd_t *restrict cond, mtx_t *restrict mutex,
>                                const struct __timespec64* restrict time_point);
>  libpthread_hidden_proto (__cnd_timedwait64)
> +extern int __mtx_timedlock64 (mtx_t *restrict mutex,
> +                              const struct __timespec64 *restrict time_point);
> +libpthread_hidden_proto (__mtx_timedlock64)
>  #endif
>  
>  static __always_inline int


Same as previous patch, I think this should be moved to a Linux internal
thread.h header.

> diff --git a/sysdeps/unix/sysv/linux/mtx_timedlock.c b/sysdeps/unix/sysv/linux/mtx_timedlock.c
> new file mode 100644
> index 0000000000..ef57dd1e41
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/mtx_timedlock.c
> @@ -0,0 +1,43 @@
> +/* C11 threads mutex timed lock implementation - Linux variant.
> +   Copyright (C) 2020 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/>.  */
> +
> +#include <time.h>
> +#include "thrd_priv.h"
> +
> +int
> +__mtx_timedlock64 (mtx_t *restrict mutex,
> +                   const struct __timespec64 *restrict time_point)
> +{
> +  int err_code = __pthread_mutex_timedlock64 ((pthread_mutex_t *)mutex,
> +                                              time_point);
> +  return thrd_err_map (err_code);
> +}
> +
> +#if __TIMESIZE != 64
> +libpthread_hidden_def (__mtx_timedlock64)
> +
> +int
> +__mtx_timedlock (mtx_t *restrict mutex,
> +                 const struct timespec *restrict time_point)
> +{
> +  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*time_point);
> +
> +  return __mtx_timedlock64(mutex, &ts64);

Space after function name.

> +}
> +#endif
> +weak_alias (__mtx_timedlock, mtx_timedlock)
> 

Re: [PATCH v2 2/3] y2038: Convert mtx_timedlock to support 64 bit time

[Alistair Francis]

On Tue, Nov 3, 2020 at 1:15 AM Lukasz Majewski <lukma@denx.de> wrote:
>
> The mtx_timedlock function has been converted to support 64 bit time.
> It was also necessary to provide Linux specific copy of it to avoid
> problems on i686-gnu (i.e. HURD) port, which is not providing
> pthread_mutex_timedlock() supporting 64 bit time.
>
> The mtx_timedlock is a wrapper on POSIX threads to provide C11 standard
> threads interface. It directly calls __pthread_mutex_timedlock64().
>
> Build tests:
> ./src/scripts/build-many-glibcs.py glibcs

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  sysdeps/pthread/thrd_priv.h             |  4 +++
>  sysdeps/unix/sysv/linux/mtx_timedlock.c | 43 +++++++++++++++++++++++++
>  2 files changed, 47 insertions(+)
>  create mode 100644 sysdeps/unix/sysv/linux/mtx_timedlock.c
>
> diff --git a/sysdeps/pthread/thrd_priv.h b/sysdeps/pthread/thrd_priv.h
> index dbfec0df7a..efe453bdec 100644
> --- a/sysdeps/pthread/thrd_priv.h
> +++ b/sysdeps/pthread/thrd_priv.h
> @@ -26,10 +26,14 @@
>
>  #if __TIMESIZE == 64
>  # define __cnd_timedwait64 __cnd_timedwait
> +# define __mtx_timedlock64 __mtx_timedlock
>  #else
>  extern int __cnd_timedwait64 (cnd_t *restrict cond, mtx_t *restrict mutex,
>                                const struct __timespec64* restrict time_point);
>  libpthread_hidden_proto (__cnd_timedwait64)
> +extern int __mtx_timedlock64 (mtx_t *restrict mutex,
> +                              const struct __timespec64 *restrict time_point);
> +libpthread_hidden_proto (__mtx_timedlock64)
>  #endif
>
>  static __always_inline int
> diff --git a/sysdeps/unix/sysv/linux/mtx_timedlock.c b/sysdeps/unix/sysv/linux/mtx_timedlock.c
> new file mode 100644
> index 0000000000..ef57dd1e41
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/mtx_timedlock.c
> @@ -0,0 +1,43 @@
> +/* C11 threads mutex timed lock implementation - Linux variant.
> +   Copyright (C) 2020 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/>.  */
> +
> +#include <time.h>
> +#include "thrd_priv.h"
> +
> +int
> +__mtx_timedlock64 (mtx_t *restrict mutex,
> +                   const struct __timespec64 *restrict time_point)
> +{
> +  int err_code = __pthread_mutex_timedlock64 ((pthread_mutex_t *)mutex,
> +                                              time_point);
> +  return thrd_err_map (err_code);
> +}
> +
> +#if __TIMESIZE != 64
> +libpthread_hidden_def (__mtx_timedlock64)
> +
> +int
> +__mtx_timedlock (mtx_t *restrict mutex,
> +                 const struct timespec *restrict time_point)
> +{
> +  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*time_point);
> +
> +  return __mtx_timedlock64(mutex, &ts64);
> +}
> +#endif
> +weak_alias (__mtx_timedlock, mtx_timedlock)
> --
> 2.20.1
>

[PATCH v2 2/3] y2038: Convert mtx_timedlock to support 64 bit time

[Lukasz Majewski]

The mtx_timedlock function has been converted to support 64 bit time.
It was also necessary to provide Linux specific copy of it to avoid
problems on i686-gnu (i.e. HURD) port, which is not providing
pthread_mutex_timedlock() supporting 64 bit time.

The mtx_timedlock is a wrapper on POSIX threads to provide C11 standard
threads interface. It directly calls __pthread_mutex_timedlock64().

Build tests:
./src/scripts/build-many-glibcs.py glibcs
---
 sysdeps/pthread/thrd_priv.h             |  4 +++
 sysdeps/unix/sysv/linux/mtx_timedlock.c | 43 +++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/mtx_timedlock.c

diff --git a/sysdeps/pthread/thrd_priv.h b/sysdeps/pthread/thrd_priv.h
index dbfec0df7a..efe453bdec 100644
--- a/sysdeps/pthread/thrd_priv.h
+++ b/sysdeps/pthread/thrd_priv.h
@@ -26,10 +26,14 @@
 
 #if __TIMESIZE == 64
 # define __cnd_timedwait64 __cnd_timedwait
+# define __mtx_timedlock64 __mtx_timedlock
 #else
 extern int __cnd_timedwait64 (cnd_t *restrict cond, mtx_t *restrict mutex,
                               const struct __timespec64* restrict time_point);
 libpthread_hidden_proto (__cnd_timedwait64)
+extern int __mtx_timedlock64 (mtx_t *restrict mutex,
+                              const struct __timespec64 *restrict time_point);
+libpthread_hidden_proto (__mtx_timedlock64)
 #endif
 
 static __always_inline int
diff --git a/sysdeps/unix/sysv/linux/mtx_timedlock.c b/sysdeps/unix/sysv/linux/mtx_timedlock.c
new file mode 100644
index 0000000000..ef57dd1e41
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mtx_timedlock.c
@@ -0,0 +1,43 @@
+/* C11 threads mutex timed lock implementation - Linux variant.
+   Copyright (C) 2020 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/>.  */
+
+#include <time.h>
+#include "thrd_priv.h"
+
+int
+__mtx_timedlock64 (mtx_t *restrict mutex,
+                   const struct __timespec64 *restrict time_point)
+{
+  int err_code = __pthread_mutex_timedlock64 ((pthread_mutex_t *)mutex,
+                                              time_point);
+  return thrd_err_map (err_code);
+}
+
+#if __TIMESIZE != 64
+libpthread_hidden_def (__mtx_timedlock64)
+
+int
+__mtx_timedlock (mtx_t *restrict mutex,
+                 const struct timespec *restrict time_point)
+{
+  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*time_point);
+
+  return __mtx_timedlock64(mutex, &ts64);
+}
+#endif
+weak_alias (__mtx_timedlock, mtx_timedlock)
-- 
2.20.1