rt: Move generic implementation from sysdeps/pthread to rt

The pthread-based implementation is the generic one.  Replacing
the stubs makes it clear that they do not have to be adjusted for
the libpthread move.

Result of:

    git mv -f sysdeps/pthread/aio_misc.h sysdeps/generic/
    git mv sysdeps/pthread/timer_routines.c sysdeps/htl/
    git mv -f sysdeps/pthread/{aio,lio,timer}_*.c rt/

Followed by manual adjustment of the #include paths in
sysdeps/unix/sysv/linux/wordsize-64, and a move of the version
definitions formerly in sysdeps/pthread/Versions.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 111 insertions, 9 deletions

diff --git a/rt/timer_settime.c b/rt/timer_settime.c
index cde0e74..c05adf1 100644
--- a/rt/timer_settime.c
+++ b/rt/timer_settime.c
@@ -1,10 +1,11 @@
-/* Copyright (C) 1999-2021 Free Software Foundation, Inc.
+/* Copyright (C) 2000-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
+   Contributed by Kaz Kylheku <kaz@ashi.footprints.net>.
 
    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.
+   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
@@ -12,18 +13,119 @@
    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/>.  */
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, see <https://www.gnu.org/licenses/>.  */
 
 #include <errno.h>
+#include <pthread.h>
 #include <time.h>
 
+#include "posix-timer.h"
+
+
 /* Set timer TIMERID to VALUE, returning old value in OVLAUE.  */
 int
 timer_settime (timer_t timerid, int flags, const struct itimerspec *value,
 	       struct itimerspec *ovalue)
 {
-  __set_errno (ENOSYS);
-  return -1;
+  struct timer_node *timer;
+  struct thread_node *thread = NULL;
+  struct timespec now;
+  int have_now = 0, need_wakeup = 0;
+  int retval = -1;
+
+  timer = timer_id2ptr (timerid);
+  if (timer == NULL)
+    {
+      __set_errno (EINVAL);
+      goto bail;
+    }
+
+  if (! valid_nanoseconds (value->it_interval.tv_nsec)
+      || ! valid_nanoseconds (value->it_value.tv_nsec))
+    {
+      __set_errno (EINVAL);
+      goto bail;
+    }
+
+  /* Will need to know current time since this is a relative timer;
+     might as well make the system call outside of the lock now! */
+
+  if ((flags & TIMER_ABSTIME) == 0)
+    {
+      __clock_gettime (timer->clock, &now);
+      have_now = 1;
+    }
+
+  pthread_mutex_lock (&__timer_mutex);
+  timer_addref (timer);
+
+  /* One final check of timer validity; this one is possible only
+     until we have the mutex, because it accesses the inuse flag. */
+
+  if (! timer_valid(timer))
+    {
+      __set_errno (EINVAL);
+      goto unlock_bail;
+    }
+
+  if (ovalue != NULL)
+    {
+      ovalue->it_interval = timer->value.it_interval;
+
+      if (timer->armed)
+	{
+	  if (! have_now)
+	    {
+	      pthread_mutex_unlock (&__timer_mutex);
+	      __clock_gettime (timer->clock, &now);
+	      have_now = 1;
+	      pthread_mutex_lock (&__timer_mutex);
+	      timer_addref (timer);
+	    }
+
+	  timespec_sub (&ovalue->it_value, &timer->expirytime, &now);
+	}
+      else
+	{
+	  ovalue->it_value.tv_sec = 0;
+	  ovalue->it_value.tv_nsec = 0;
+	}
+    }
+
+  timer->value = *value;
+
+  list_unlink_ip (&timer->links);
+  timer->armed = 0;
+
+  thread = timer->thread;
+
+  /* A value of { 0, 0 } causes the timer to be stopped. */
+  if (value->it_value.tv_sec != 0
+      || __builtin_expect (value->it_value.tv_nsec != 0, 1))
+    {
+      if ((flags & TIMER_ABSTIME) != 0)
+	/* The user specified the expiration time.  */
+	timer->expirytime = value->it_value;
+      else
+	timespec_add (&timer->expirytime, &now, &value->it_value);
+
+      /* Only need to wake up the thread if timer is inserted
+	 at the head of the queue. */
+      if (thread != NULL)
+	need_wakeup = __timer_thread_queue_timer (thread, timer);
+      timer->armed = 1;
+    }
+
+  retval = 0;
+
+unlock_bail:
+  timer_delref (timer);
+  pthread_mutex_unlock (&__timer_mutex);
+
+bail:
+  if (thread != NULL && need_wakeup)
+    __timer_thread_wakeup (thread);
+
+  return retval;
 }
-stub_warning (timer_settime)