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, 99 insertions, 0 deletions

diff --git a/sysdeps/mach/hurd/htl/pt-sysdep.c b/sysdeps/mach/hurd/htl/pt-sysdep.c
new file mode 100644
index 0000000000..40ebc8e6d6
--- /dev/null
+++ b/sysdeps/mach/hurd/htl/pt-sysdep.c
@@ -0,0 +1,99 @@
+/* System dependent pthreads code.  Hurd version.
+   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 <stddef.h>
+#include <stdint.h>
+
+#include <mach.h>
+#include <mach/mig_support.h>
+
+#include <pt-internal.h>
+
+__thread struct __pthread *___pthread_self;
+
+/* Forward.  */
+static void *init_routine (void);
+
+/* OK, the name of this variable isn't really appropriate, but I don't
+   want to change it yet.  */
+void *(*_cthread_init_routine) (void) = &init_routine;
+
+/* This function is called from the Hurd-specific startup code.  It
+   should return a new stack pointer for the main thread.  The caller
+   will switch to this new stack before doing anything serious.  */
+static void *
+_init_routine (void *stack)
+{
+  struct __pthread *thread;
+  int err;
+  pthread_attr_t attr, *attrp = 0;
+
+  if (__pthread_threads != NULL)
+    /* Already initialized */
+    return 0;
+
+  /* Initialize the library.  */
+  ___pthread_init ();
+
+  if (stack != NULL)
+    {
+      /* We are getting initialized due to dlopening a library using libpthread
+         while the main program was not linked against libpthread.  */
+      /* Avoid allocating another stack */
+      attrp = &attr;
+      pthread_attr_init (attrp);
+      pthread_attr_setstack (attrp, stack, __vm_page_size);
+    }
+
+  /* Create the pthread structure for the main thread (i.e. us).  */
+  err = __pthread_create_internal (&thread, attrp, 0, 0);
+  assert_perror (err);
+
+  /* XXX The caller copies the command line arguments and the environment
+     to the new stack.  Pretend it wasn't allocated so that it remains
+     valid if the main thread terminates.  */
+  thread->stack = 0;
+
+  ___pthread_self = thread;
+
+  /* Decrease the number of threads, to take into account that the
+     signal thread (which will be created by the glibc startup code
+     when we return from here) shouldn't be seen as a user thread.  */
+  __pthread_total--;
+
+  /* Make MiG code thread aware.  */
+  __mig_init (thread->stackaddr);
+
+  return thread->mcontext.sp;
+}
+
+static void *
+init_routine (void)
+{
+  return _init_routine (0);
+}
+
+#ifdef SHARED
+__attribute__ ((constructor))
+static void
+dynamic_init_routine (void)
+{
+  _init_routine (__libc_stack_end);
+}
+#endif