-/* Threads compatibily routines for libgcc2 for VxWorks. */
+/* Threads compatibility routines for libgcc2 and libobjc for VxWorks. */
/* Compile this one with gcc. */
-/* Copyright (C) 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1999, 2000, 2008, 2009 Free Software Foundation, Inc.
Contributed by Mike Stump <mrs@wrs.com>.
-This file is part of GNU CC.
+This file is part of GCC.
-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.
+GCC 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 3, 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.
+GCC 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. */
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
-/* 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. */
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+<http://www.gnu.org/licenses/>. */
-#ifndef __gthr_vxworks_h
-#define __gthr_vxworks_h
+#ifndef GCC_GTHR_VXWORKS_H
+#define GCC_GTHR_VXWORKS_H
-/* POSIX threads specific definitions.
- Easy, since the interface is just one-to-one mapping. */
+#ifdef _LIBOBJC
+
+/* libobjc requires the optional pthreads component. */
+#include "gthr-posix.h"
+
+#else
+#ifdef __cplusplus
+#define UNUSED(x)
+#else
+#define UNUSED(x) x __attribute__((unused))
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
#define __GTHREADS 1
+#define __gthread_active_p() 1
+
+/* Mutexes are easy, except that they need to be initialized at runtime. */
-#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;
+/* All VxWorks mutexes are recursive. */
+typedef SEM_ID __gthread_recursive_mutex_t;
+#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
-#define __GTHREAD_MUTEX_INIT 0
-#define __GTHREAD_ONCE_INIT 0
+static inline void
+__gthread_mutex_init_function (__gthread_mutex_t *mutex)
+{
+ *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
+}
-#ifndef REG_SAVED_REG
static inline int
-__gthread_once (__gthread_once_t *once, void (*func) ())
+__gthread_mutex_destroy (__gthread_mutex_t * UNUSED(mutex))
{
- (*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 ()
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *mutex)
{
- if (eh_context_key)
- free ((void*)eh_context_key);
- eh_context_key = 0;
+ return semTake (*mutex, WAIT_FOREVER);
}
-/* This only works for the code in libgcc2.c. */
-
static inline int
-__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
+__gthread_mutex_trylock (__gthread_mutex_t *mutex)
{
- *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;
+ return semTake (*mutex, NO_WAIT);
}
-#define __gthread_setspecific(key, ptr) \
- (key = (int) ptr, 0)
-
static inline int
-__gthread_key_dtor (__gthread_key_t key, void *ptr)
+__gthread_mutex_unlock (__gthread_mutex_t *mutex)
{
- /* Just reset the key value to zero. */
- if (ptr)
- return __gthread_setspecific (key, 0);
- else
- return 0;
+ return semGive (*mutex);
}
-#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 void
+__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
+{
+ __gthread_mutex_init_function (mutex);
+}
static inline int
-__gthread_mutex_lock (__gthread_mutex_t *mutex)
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
{
- if (*mutex == 0)
- *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
- return semTake (*mutex, WAIT_FOREVER);
+ return __gthread_mutex_lock (mutex);
}
static inline int
-__gthread_mutex_trylock (__gthread_mutex_t *mutex)
+__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
{
- if (*mutex == 0)
- *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
- return semTake (*mutex, NO_WAIT);
+ return __gthread_mutex_trylock (mutex);
}
static inline int
-__gthread_mutex_unlock (__gthread_mutex_t *mutex)
+__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
{
- /* We could return the */
- return semGive (*mutex);
+ return __gthread_mutex_unlock (mutex);
}
-#endif /* not __gthr_vxworks_h */
+/* pthread_once is complicated enough that it's implemented
+ out-of-line. See config/vxlib.c. */
+
+typedef struct
+{
+#if !defined(__RTP__)
+#if defined(__PPC__)
+ __attribute ((aligned (__alignof (unsigned))))
+#endif
+ volatile unsigned char busy;
+#endif
+ volatile unsigned char done;
+#if !defined(__RTP__) && defined(__PPC__)
+ /* PPC's test-and-set implementation requires a 4 byte aligned
+ object, of which it only sets the first byte. We use padding
+ here, in order to maintain some amount of backwards
+ compatibility. Without this padding, gthread_once objects worked
+ by accident because they happen to be static objects and the ppc
+ port automatically increased their alignment to 4 bytes. */
+ unsigned char pad1;
+ unsigned char pad2;
+#endif
+}
+__gthread_once_t;
+
+#if defined (__RTP__)
+# define __GTHREAD_ONCE_INIT { 0 }
+#elif defined (__PPC__)
+# define __GTHREAD_ONCE_INIT { 0, 0, 0, 0 }
+#else
+# define __GTHREAD_ONCE_INIT { 0, 0 }
+#endif
+
+extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void));
+
+/* Thread-specific data requires a great deal of effort, since VxWorks
+ is not really set up for it. See config/vxlib.c for the gory
+ details. All the TSD routines are sufficiently complex that they
+ need to be implemented out of line. */
+
+typedef unsigned int __gthread_key_t;
+
+extern int __gthread_key_create (__gthread_key_t *__keyp, void (*__dtor)(void *));
+extern int __gthread_key_delete (__gthread_key_t __key);
+
+extern void *__gthread_getspecific (__gthread_key_t __key);
+extern int __gthread_setspecific (__gthread_key_t __key, void *__ptr);
+
+#undef UNUSED
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* not _LIBOBJC */
+
+#endif /* gthr-vxworks.h */
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