[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