Merge branch 'upstream-merged' of git.debian.org:/git/pkg-hurd/hurd into upstream-merged

1 files changed, 92 insertions, 0 deletions

diff --git a/libpthread/pthread/pt-detach.c b/libpthread/pthread/pt-detach.c
new file mode 100644
index 00000000..1e42c452
--- /dev/null
+++ b/libpthread/pthread/pt-detach.c
@@ -0,0 +1,92 @@
+/* Detach a thread.
+   Copyright (C) 2000, 2005 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 <errno.h>
+#include <pthread.h>
+#include <stddef.h>
+
+#include <pt-internal.h>
+
+/* Indicate that the storage for THREAD can be reclaimed when it
+   terminates.  */
+int
+pthread_detach (pthread_t thread)
+{
+  struct __pthread *pthread;
+  int err = 0;
+
+  /* Lookup the thread structure for THREAD.  */
+  pthread = __pthread_getid (thread);
+  if (pthread == NULL)
+    return ESRCH;
+
+  __pthread_mutex_lock (&pthread->state_lock);
+
+  switch (pthread->state)
+    {
+    case PTHREAD_JOINABLE:
+      /* THREAD still running.  Mark it as detached such that its
+         resources can be reclaimed as soon as the thread exits.  */
+      pthread->state = PTHREAD_DETACHED;
+
+      /* Broadcast the condition.  This will make threads that are
+	 waiting to join THREAD continue with hopefully disastrous
+	 consequences instead of blocking indefinitely.  */
+      pthread_cond_broadcast (&pthread->state_cond);
+      __pthread_mutex_unlock (&pthread->state_lock);
+      break;
+
+    case PTHREAD_EXITED:
+      /* THREAD has already exited.  Make sure that nobody can
+         reference it anymore, and mark it as terminated.  */
+
+      __pthread_mutex_unlock (&pthread->state_lock);
+
+      /* Make sure the thread is not running before we remove its
+         stack.  (The only possibility is that it is in a call to
+         __pthread_thread_halt itself, but that is enough to cause a
+         sigsegv.)  */
+      __pthread_thread_halt (pthread);
+
+      /* Destroy the stack, the kernel resources and the control
+	 block.  */
+      assert (pthread->stack);
+      __pthread_stack_dealloc (pthread->stackaddr, pthread->stacksize);
+      pthread->stack = 0;
+
+      __pthread_thread_dealloc (pthread);
+
+      __pthread_dealloc (pthread);
+      break;
+
+    case PTHREAD_TERMINATED:
+      /* Pretend THREAD wasn't there in the first place.  */
+      __pthread_mutex_unlock (&pthread->state_lock);
+      err = ESRCH;
+      break;
+
+    default:
+      /* Thou shalt not detach non-joinable threads!  */
+      __pthread_mutex_unlock (&pthread->state_lock);
+      err = EINVAL;
+      break;
+    }
+
+  return err;
+}