* gthr.h: Support systems that don't have weak, but have threads.

        * configure.in (*wrs-vxworks*): Use VxWorks threads by default.
        * gthr-vxworks.h: New file.
        * objc/thr-vxworks.h: Dummy file from thr-single.c for now.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@18971 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 132 insertions, 0 deletions

diff --git a/gcc/gthr-vxworks.h b/gcc/gthr-vxworks.h
new file mode 100644
index 00000000000..98766467818
--- /dev/null
+++ b/gcc/gthr-vxworks.h
@@ -0,0 +1,132 @@
+/* Threads compatibily routines for libgcc2 for VxWorks.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 1997 Free Software Foundation, Inc.
+   Contributed by Mike Stump <mrs@wrs.com>.
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU CC 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* As a special exception, if you link this library with other files,
+   some of which are compiled with GCC, to produce an executable,
+   this library does not by itself cause the resulting executable
+   to be covered by the GNU General Public License.
+   This exception does not however invalidate any other reasons why
+   the executable file might be covered by the GNU General Public License.  */
+
+#ifndef __gthr_vxworks_h
+#define __gthr_vxworks_h
+
+/* POSIX threads specific definitions.
+   Easy, since the interface is just one-to-one mapping. */
+
+#define __GTHREADS 1
+
+#include <vxWorks.h>
+#include <semLib.h>
+/* typedef void *SEM_ID; */
+
+typedef int __gthread_key_t;
+typedef char __gthread_once_t;
+typedef SEM_ID __gthread_mutex_t;
+
+#define __GTHREAD_MUTEX_INIT 0
+#define __GTHREAD_ONCE_INIT 0
+
+#ifndef REG_SAVED_REG
+static inline int
+__gthread_once (__gthread_once_t *once, void (*func) ())
+{
+  (*func)();
+  return 0;
+}
+
+extern __gthread_key_t eh_context_key;
+
+/* This is not the right way to do it, but the semantic of pthreads
+   don't map well enough onto VxWorks.  */
+
+static void
+__ehdtor ()
+{
+  if (eh_context_key)
+    free ((void*)eh_context_key);
+  eh_context_key = 0;
+}
+
+/* This only works for the code in libgcc2.c.  */
+
+static inline int
+__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
+{
+  *key = 0;
+
+  /* We don't have a way to track dtor here, so instead, we
+     register a generic routine that can cleanup any task.  */
+
+  taskDeleteHookAdd (__ehdtor);
+
+  return 0;
+}
+
+#define __gthread_setspecific(key, ptr) \
+  (key = (int) ptr, 0)
+
+static inline int
+__gthread_key_dtor (__gthread_key_t key, void *ptr)
+{
+  /* Just reset the key value to zero. */
+  if (ptr)
+    return __gthread_setspecific (key, 0);
+  else
+    return 0;
+}
+
+#define __gthread_key_delete(key) \
+  taskVarDelete (taskIdSelf (), &key)
+
+#define __gthread_getspecific(key)			\
+     ((key == 0)					\
+      ? ((taskVarAdd (taskIdSelf (), &key) != OK)	\
+	 ? (__terminate (), (void*)0)			\
+	 : (void*)0)					\
+      : (void*)key)
+#endif
+
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *mutex)
+{
+  if (*mutex == 0)
+    *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
+  return semTake (*mutex, WAIT_FOREVER);
+}
+
+static inline int
+__gthread_mutex_trylock (__gthread_mutex_t *mutex)
+{
+  if (*mutex == 0)
+    *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
+  return semTake (*mutex, NO_WAIT);
+}
+
+static inline int
+__gthread_mutex_unlock (__gthread_mutex_t *mutex)
+{
+  /* We could return the */
+  return semGive (*mutex);
+}
+
+#endif /* not __gthr_vxworks_h */