hurd: Add hurd thread library

Contributed by

Agustina Arzille <avarzille@riseup.net>
Amos Jeffries <squid3@treenet.co.nz>
David Michael <fedora.dm0@gmail.com>
Marco Gerards <marco@gnu.org>
Marcus Brinkmann <marcus@gnu.org>
Neal H. Walfield <neal@gnu.org>
Pino Toscano <toscano.pino@tiscali.it>
Richard Braun <rbraun@sceen.net>
Roland McGrath <roland@gnu.org>
Samuel Thibault <samuel.thibault@ens-lyon.org>
Thomas DiModica <ricinwich@yahoo.com>
Thomas Schwinge <tschwinge@gnu.org>

	* htl: New directory.
	* sysdeps/htl: New directory.
	* sysdeps/hurd/htl: New directory.
	* sysdeps/i386/htl: New directory.
	* sysdeps/mach/htl: New directory.
	* sysdeps/mach/hurd/htl: New directory.
	* sysdeps/mach/hurd/i386/htl: New directory.
	* nscd/Depend, resolv/Depend, rt/Depend: Add htl dependency.
	* sysdeps/mach/hurd/i386/Implies: Add mach/hurd/i386/htl imply.
	* sysdeps/mach/hurd/i386/libpthread.abilist: New file.

1 files changed, 111 insertions, 0 deletions

diff --git a/htl/pt-exit.c b/htl/pt-exit.c
new file mode 100644
index 0000000000..8f3d755773
--- /dev/null
+++ b/htl/pt-exit.c
@@ -0,0 +1,111 @@
+/* Thread termination.
+   Copyright (C) 2000-2018 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#include <assert.h>
+#include <errno.h>
+#include <pthread.h>
+#include <stdlib.h>
+
+#include <pt-internal.h>
+
+#include <atomic.h>
+
+
+/* Terminate the current thread and make STATUS available to any
+   thread that might join it.  */
+void
+__pthread_exit (void *status)
+{
+  struct __pthread *self = _pthread_self ();
+  struct __pthread_cancelation_handler **handlers;
+  int oldstate;
+
+  /* Run any cancelation handlers.  According to POSIX, the
+     cancellation cleanup handlers should be called with cancellation
+     disabled.  */
+  pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);
+
+  for (handlers = __pthread_get_cleanup_stack ();
+       *handlers != NULL;
+       *handlers = (*handlers)->__next)
+    (*handlers)->__handler ((*handlers)->__arg);
+
+  pthread_setcancelstate (oldstate, &oldstate);
+
+  /* Decrease the number of threads.  We use an atomic operation to
+     make sure that only the last thread calls `exit'.  */
+  if (atomic_decrement_and_test (&__pthread_total))
+    /* We are the last thread.  */
+    exit (0);
+
+  /* Note that after this point the process can be terminated at any
+     point if another thread calls `pthread_exit' and happens to be
+     the last thread.  */
+
+  __pthread_mutex_lock (&self->state_lock);
+
+  if (self->cancel_state == PTHREAD_CANCEL_ENABLE && self->cancel_pending)
+    status = PTHREAD_CANCELED;
+
+  switch (self->state)
+    {
+    default:
+      assert (!"Consistency error: unexpected self->state");
+      abort ();
+      break;
+
+    case PTHREAD_DETACHED:
+      __pthread_mutex_unlock (&self->state_lock);
+
+      break;
+
+    case PTHREAD_JOINABLE:
+      /* We need to stay around for a while since another thread
+         might want to join us.  */
+      self->state = PTHREAD_EXITED;
+
+      /* We need to remember the exit status.  A thread joining us
+         might ask for it.  */
+      self->status = status;
+
+      /* Broadcast the condition.  This will wake up threads that are
+         waiting to join us.  */
+      __pthread_cond_broadcast (&self->state_cond);
+      __pthread_mutex_unlock (&self->state_lock);
+
+      break;
+    }
+
+  /* Destroy any thread specific data.  */
+  __pthread_destroy_specific (self);
+
+  /* Destroy any signal state.  */
+  __pthread_sigstate_destroy (self);
+
+  /* Self terminating requires TLS, so defer the release of the TCB until
+     the thread structure is reused.  */
+
+  /* Release kernel resources, including the kernel thread and the stack,
+     and drop the self reference.  */
+  __pthread_thread_terminate (self);
+
+  /* NOTREACHED */
+  abort ();
+}
+
+strong_alias (__pthread_exit, pthread_exit);