1 files changed, 98 insertions, 0 deletions
diff --git a/sysdeps/mach/pt-thread-alloc.c b/sysdeps/mach/pt-thread-alloc.c
new file mode 100644
index 00000000..af929533
--- /dev/null
+++ b/sysdeps/mach/pt-thread-alloc.c
@@ -0,0 +1,98 @@
+/* Start thread.  Mach version.
+   Copyright (C) 2000,02 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,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+
+#include <mach.h>
+
+#include <pt-internal.h>
+
+/* Prepare a wakeup message.  */
+static error_t
+create_wakeupmsg (struct __pthread *thread)
+{
+  kern_return_t err;
+
+  /* Build wakeup message.  */
+  thread->wakeupmsg.msgh_bits = MACH_MSGH_BITS (MACH_MSG_TYPE_COPY_SEND, 0);
+  thread->wakeupmsg.msgh_size = 0;
+
+  err = __mach_port_allocate (__mach_task_self (), MACH_PORT_RIGHT_RECEIVE,
+			      &thread->wakeupmsg.msgh_remote_port);
+  if (err)
+    return EAGAIN;
+
+  thread->wakeupmsg.msgh_local_port = MACH_PORT_NULL;
+  thread->wakeupmsg.msgh_seqno = 0;
+  thread->wakeupmsg.msgh_id = 0;
+
+  err = __mach_port_insert_right (__mach_task_self (),
+				  thread->wakeupmsg.msgh_remote_port,
+				  thread->wakeupmsg.msgh_remote_port,
+				  MACH_MSG_TYPE_MAKE_SEND);
+  if (err)
+    {
+      __mach_port_deallocate (__mach_task_self (),
+			      thread->wakeupmsg.msgh_remote_port);
+      return EAGAIN;
+    }
+
+  return 0;
+}
+
+/* Allocate any resouces for THREAD.  The new kernel thread should not
+   be eligible to be scheduled.  */
+int
+__pthread_thread_alloc (struct __pthread *thread)
+{
+  error_t err;
+
+  err = create_wakeupmsg (thread);
+  if (err)
+    return err;
+
+  /* If there are no pthreads in the system then the pthread library
+     is bootstrapping and the main thread must create initialize
+     itself.  The thread itself is already running, it just has not
+     pthread context.  We want to reuse what it already has (including
+     the kernel thread), however, we must determine which thread is
+     the main thread.
+
+     We cannot test if __pthread_total is one as we later decrement
+     before creating the signal thread.  Currently, we check if
+     __pthread_num_threads--the number of allocated thread
+     structures--is one.  __pthread_alloc has already been called in
+     __pthread_create_internal for us.  This predicate could be improved,
+     however, it is sufficient for now.  */
+  if (__pthread_num_threads == 1)
+    {
+      assert (__pthread_total == 0);
+      thread->kernel_thread = __mach_thread_self ();
+    }
+  else
+    {
+      err = __thread_create (__mach_task_self (), &thread->kernel_thread);
+      if (err)
+	return EAGAIN;
+    }
+
+  return 0;
+}