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, 246 insertions, 0 deletions

diff --git a/htl/pt-create.c b/htl/pt-create.c
new file mode 100644
index 0000000..f5c06ff
--- /dev/null
+++ b/htl/pt-create.c
@@ -0,0 +1,246 @@
+/* Thread creation.
+   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 <signal.h>
+#include <resolv.h>
+
+#include <atomic.h>
+#include <hurd/resource.h>
+
+#include <pt-internal.h>
+
+#if IS_IN (libpthread)
+# include <ctype.h>
+#endif
+#ifdef HAVE_USELOCALE
+# include <locale.h>
+#endif
+
+/* The total number of pthreads currently active.  This is defined
+   here since it would be really stupid to have a threads-using
+   program that doesn't call `pthread_create'.  */
+unsigned int __pthread_total;
+
+
+/* The entry-point for new threads.  */
+static void
+entry_point (struct __pthread *self, void *(*start_routine) (void *), void *arg)
+{
+  ___pthread_self = self;
+  __resp = &self->res_state;
+
+#if IS_IN (libpthread)
+  /* Initialize pointers to locale data.  */
+  __ctype_init ();
+#endif
+#ifdef HAVE_USELOCALE
+  /* A fresh thread needs to be bound to the global locale.  */
+  uselocale (LC_GLOBAL_LOCALE);
+#endif
+
+  __pthread_startup ();
+
+  pthread_exit (start_routine (arg));
+}
+
+/* Create a thread with attributes given by ATTR, executing
+   START_ROUTINE with argument ARG.  */
+int
+pthread_create (pthread_t * thread, const pthread_attr_t * attr,
+		void *(*start_routine) (void *), void *arg)
+{
+  int err;
+  struct __pthread *pthread;
+
+  err = __pthread_create_internal (&pthread, attr, start_routine, arg);
+  if (!err)
+    *thread = pthread->thread;
+  else if (err == ENOMEM)
+    err = EAGAIN;
+
+  return err;
+}
+
+/* Internal version of pthread_create.  See comment in
+   pt-internal.h.  */
+int
+__pthread_create_internal (struct __pthread **thread,
+			   const pthread_attr_t * attr,
+			   void *(*start_routine) (void *), void *arg)
+{
+  int err;
+  struct __pthread *pthread;
+  const struct __pthread_attr *setup;
+  sigset_t sigset;
+  size_t stacksize;
+
+  /* Allocate a new thread structure.  */
+  err = __pthread_alloc (&pthread);
+  if (err)
+    goto failed;
+
+  /* Use the default attributes if ATTR is NULL.  */
+  setup = attr ? attr : &__pthread_default_attr;
+
+  stacksize = setup->__stacksize;
+  if (stacksize == 0)
+    {
+      struct rlimit rlim;
+      __getrlimit (RLIMIT_STACK, &rlim);
+      if (rlim.rlim_cur != RLIM_INFINITY)
+	stacksize = rlim.rlim_cur;
+      if (stacksize == 0)
+	stacksize = PTHREAD_STACK_DEFAULT;
+    }
+
+  /* Initialize the thread state.  */
+  pthread->state = (setup->__detachstate == PTHREAD_CREATE_DETACHED
+		    ? PTHREAD_DETACHED : PTHREAD_JOINABLE);
+
+  if (setup->__stackaddr)
+    {
+      pthread->stackaddr = setup->__stackaddr;
+
+      /* If the user supplied a stack, it is not our responsibility to
+         setup a stack guard.  */
+      pthread->guardsize = 0;
+      pthread->stack = 0;
+    }
+  else
+    {
+      /* Allocate a stack.  */
+      err = __pthread_stack_alloc (&pthread->stackaddr,
+				   ((setup->__guardsize + __vm_page_size - 1)
+				    / __vm_page_size) * __vm_page_size
+				   + stacksize);
+      if (err)
+	goto failed_stack_alloc;
+
+      pthread->guardsize = setup->__guardsize;
+      pthread->stack = 1;
+    }
+
+  pthread->stacksize = stacksize;
+
+  /* Allocate the kernel thread and other required resources.  */
+  err = __pthread_thread_alloc (pthread);
+  if (err)
+    goto failed_thread_alloc;
+
+  pthread->tcb = _dl_allocate_tls (NULL);
+  if (pthread->tcb == NULL)
+    {
+      err = ENOMEM;
+      goto failed_thread_tls_alloc;
+    }
+  pthread->tcb->tcb = pthread->tcb;
+
+  /* And initialize the rest of the machine context.  This may include
+     additional machine- and system-specific initializations that
+     prove convenient.  */
+  err = __pthread_setup (pthread, entry_point, start_routine, arg);
+  if (err)
+    goto failed_setup;
+
+  /* Initialize the system-specific signal state for the new
+     thread.  */
+  err = __pthread_sigstate_init (pthread);
+  if (err)
+    goto failed_sigstate;
+
+  /* If the new thread is joinable, add a reference for the caller.  */
+  if (pthread->state == PTHREAD_JOINABLE)
+    pthread->nr_refs++;
+
+  /* Set the new thread's signal mask and set the pending signals to
+     empty.  POSIX says: "The signal mask shall be inherited from the
+     creating thread.  The set of signals pending for the new thread
+     shall be empty."  If the currnet thread is not a pthread then we
+     just inherit the process' sigmask.  */
+  if (__pthread_num_threads == 1)
+    err = sigprocmask (0, 0, &sigset);
+  else
+    err = __pthread_sigstate (_pthread_self (), 0, 0, &sigset, 0);
+  assert_perror (err);
+
+  err = __pthread_sigstate (pthread, SIG_SETMASK, &sigset, 0, 1);
+  assert_perror (err);
+
+  /* Increase the total number of threads.  We do this before actually
+     starting the new thread, since the new thread might immediately
+     call `pthread_exit' which decreases the number of threads and
+     calls `exit' if the number of threads reaches zero.  Increasing
+     the number of threads from within the new thread isn't an option
+     since this thread might return and call `pthread_exit' before the
+     new thread runs.  */
+  atomic_increment (&__pthread_total);
+
+  /* Store a pointer to this thread in the thread ID lookup table.  We
+     could use __thread_setid, however, we only lock for reading as no
+     other thread should be using this entry (we also assume that the
+     store is atomic).  */
+  __pthread_rwlock_rdlock (&__pthread_threads_lock);
+  __pthread_threads[pthread->thread - 1] = pthread;
+  __pthread_rwlock_unlock (&__pthread_threads_lock);
+
+  /* At this point it is possible to guess our pthread ID.  We have to
+     make sure that all functions taking a pthread_t argument can
+     handle the fact that this thread isn't really running yet.  Since
+     the new thread might be passed its ID through pthread_create (to
+     avoid calling pthread_self), read it before starting the thread.  */
+  *thread = pthread;
+
+  /* Schedule the new thread.  */
+  err = __pthread_thread_start (pthread);
+  if (err)
+    goto failed_starting;
+
+
+  return 0;
+
+failed_starting:
+  /* If joinable, a reference was added for the caller.  */
+  if (pthread->state == PTHREAD_JOINABLE)
+    __pthread_dealloc (pthread);
+
+  __pthread_setid (pthread->thread, NULL);
+  atomic_decrement (&__pthread_total);
+failed_sigstate:
+  __pthread_sigstate_destroy (pthread);
+failed_setup:
+  _dl_deallocate_tls (pthread->tcb, 1);
+  pthread->tcb = NULL;
+failed_thread_tls_alloc:
+  __pthread_thread_terminate (pthread);
+
+  /* __pthread_thread_terminate has taken care of deallocating the stack and
+     the thread structure.  */
+  goto failed;
+failed_thread_alloc:
+  if (pthread->stack)
+    __pthread_stack_dealloc (pthread->stackaddr,
+			     ((setup->__guardsize + __vm_page_size - 1)
+			      / __vm_page_size) * __vm_page_size + stacksize);
+failed_stack_alloc:
+  __pthread_dealloc (pthread);
+failed:
+  return err;
+}