Add __cxa_atexit(); atexit() is now built on top of on_exit()

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5292 42af7a65-404d-4744-a932-0658087f49c3

nuttx/ChangeLog

@@ -3547,4 +3547,10 @@
 	  is equivalent to !feof()); the others should be good.
 	* configs/stm32f4discovery/include/board.h:  Correct timer 2-7
 	  base frequency (provided by Freddie Chopin).
-
+	* include/nuttx/sched.h, sched/atexit.c, and sched/task_deletehook.c:
+	  If both atexit() and on_exit() are enabled, then implement atexit()
+	  as just a special caseof on_exit().  This assumes that the ABI can
+	  handle receipt of more call parameters than the receiving function
+	  expects.  That is usually the case if parameters are passed in
+	  registers.
+	* libxx/libxx_cxa_atexit():  Implements __cxa_atexit()

nuttx/configs/sim/cxxtest/defconfig

@@ -136,7 +136,8 @@ CONFIG_SDCLONE_DISABLE=y
 # CONFIG_SCHED_WORKQUEUE is not set
 # CONFIG_SCHED_WAITPID is not set
 # CONFIG_SCHED_ATEXIT is not set
-# CONFIG_SCHED_ONEXIT is not set
+CONFIG_SCHED_ONEXIT=y
+CONFIG_SCHED_ONEXIT_MAX=4
 CONFIG_USER_ENTRYPOINT="cxxtest_main"
 CONFIG_DISABLE_OS_API=y
 # CONFIG_DISABLE_CLOCK is not set

nuttx/include/nuttx/sched.h

@@ -138,11 +138,11 @@ typedef union entry_u entry_t;
  */
 
 #ifdef CONFIG_SCHED_ATEXIT
-typedef void (*atexitfunc_t)(void);
+typedef CODE void (*atexitfunc_t)(void);
 #endif
 
 #ifdef CONFIG_SCHED_ONEXIT
-typedef void (*onexitfunc_t)(int exitcode, FAR void *arg);
+typedef CODE void (*onexitfunc_t)(int exitcode, FAR void *arg);
 #endif
 
 /* POSIX Message queue */
@@ -189,7 +189,7 @@ struct _TCB
   start_t  start;                        /* Thread start function               */
   entry_t  entry;                        /* Entry Point into the thread         */
 
-#ifdef CONFIG_SCHED_ATEXIT
+#if defined(CONFIG_SCHED_ATEXIT) && !defined(CONFIG_SCHED_ONEXIT)
 # if defined(CONFIG_SCHED_ATEXIT_MAX) && CONFIG_SCHED_ATEXIT_MAX > 1
   atexitfunc_t atexitfunc[CONFIG_SCHED_ATEXIT_MAX];
 # else

nuttx/libxx/Makefile

@@ -39,8 +39,10 @@
 
 ASRCS = 
 CSRCS = 
+
 CXXSRCS  = libxx_cxapurevirtual.cxx libxx_delete.cxx libxx_deletea.cxx
-CXXSRCS += libxx_eabi_atexit.cxx libxx_new.cxx libxx_newa.cxx 
+CXXSRCS += libxx_eabi_atexit.cxx  libxx_cxa_atexit.cxx libxx_new.cxx
+CXXSRCS += libxx_newa.cxx 
 
 # Paths
 

nuttx/libxx/libxx_cxa_atexit.cxx

@@ -0,0 +1,143 @@
+//***************************************************************************
+// libxx/libxx_eabi_atexit.cxx
+//
+//   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+//   Author: Gregory Nutt <gnutt@nuttx.org>
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//
+// 1. Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in
+//    the documentation and/or other materials provided with the
+//    distribution.
+// 3. Neither the name NuttX nor the names of its contributors may be
+//    used to endorse or promote products derived from this software
+//    without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//***************************************************************************
+
+//***************************************************************************
+// Included Files
+//***************************************************************************
+
+#include <nuttx/config.h>
+
+#include <cstdlib>
+#include <cassert>
+
+#include "libxx_internal.hxx"
+
+//***************************************************************************
+// Pre-processor Definitions
+//***************************************************************************
+
+//***************************************************************************
+// Private Types
+//***************************************************************************
+
+struct __cxa_atexit_s
+{
+  __cxa_exitfunc_t func;
+  FAR void *arg;
+};
+
+//***************************************************************************
+// Private Data
+//***************************************************************************
+
+extern "C"
+{
+  //*************************************************************************
+  // Public Data
+  //*************************************************************************
+
+  FAR void *__dso_handle = NULL;
+
+  //*************************************************************************
+  // Private Functions
+  //*************************************************************************
+
+  //*************************************************************************
+  // Name: __cxa_callback
+  //
+  // Description:
+  //   This is really just an "adaptor" function that matches the form of
+  //   the __cxa_exitfunc_t to an onexitfunc_t using an allocated structure
+  //   to marshall the call parameters.
+  //
+  //*************************************************************************
+
+#if CONFIG_SCHED_ONEXIT
+  static void __cxa_callback(int exitcode, FAR void *arg)
+  {
+    FAR struct __cxa_atexit_s *alloc = (FAR struct __cxa_atexit_s *)arg;
+    DEBUGASSERT(alloc && alloc->func);
+
+    alloc->func(alloc->arg);
+    free(alloc);
+  }
+#endif
+
+  //*************************************************************************
+  // Public Functions
+  //*************************************************************************
+
+  //*************************************************************************
+  // Name: __cxa_atexit
+  //
+  // Description:
+  //   __cxa_atexit() registers a destructor function to be called by exit().
+  //   On a call to exit(), the registered functions should be called with
+  //   the single argument 'arg'. Destructor functions shall always be
+  //   called in the reverse order to their registration (i.e. the most
+  //   recently registered function shall be called first),
+  //
+  //   If shared libraries were supported, the callbacks should be invoked
+  //   when the shared library is unloaded as well.
+  //
+  // Reference:
+  //   Linux base
+  //
+  //*************************************************************************
+
+  int __cxa_atexit(__cxa_exitfunc_t func, FAR void *arg, FAR void *dso_handle)
+    {
+#if CONFIG_SCHED_ONEXIT
+      // Allocate memory to hold the marshaled __cxa_exitfunc_t call
+      // information.
+
+      FAR struct __cxa_atexit_s *alloc =
+        (FAR struct __cxa_atexit_s *)malloc(sizeof(struct __cxa_atexit_s));
+
+      if (alloc)
+        {
+          // Register the function to be called when the task/thread exists.
+
+          return on_exit(__cxa_callback, alloc);
+        }
+      else
+#endif
+        {
+          // What else can we do?
+
+          return 0;
+        }
+    }
+}

nuttx/libxx/libxx_eabi_atexit.cxx

@@ -40,26 +40,22 @@
 #include <nuttx/config.h>
 #include <cstdlib>
 
+#include "libxx_internal.hxx"
+
 //***************************************************************************
-// Definitions
+// Pre-processor Definitions
 //***************************************************************************
 
 //***************************************************************************
 // Private Data
 //***************************************************************************
 
-extern "C"
+//***************************************************************************
-{
-  //*************************************************************************
-  // Public Data
-  //*************************************************************************
-
-  void *__dso_handle = NULL;
-
-  //*************************************************************************
 // Public Functions
-  //*************************************************************************
+//***************************************************************************
 
+extern "C"
+{
   //*************************************************************************
   // Name: __aeabi_atexit
   //
@@ -75,9 +71,8 @@ extern "C"
   //
   //*************************************************************************
 
-  int __aeabi_atexit(void* object, void (*destroyer)(void*), void *dso_handle)
+  int __aeabi_atexit(FAR void *object, __cxa_exitfunc_t func, FAR void *dso_handle)
     {
-      //return __cxa_atexit(destroyer, object, dso_handle); // 0 ? OK; non-0 ? failed }
+      return __cxa_atexit(func, object, dso_handle); // 0 ? OK; non-0 ? failed
-      return 0;
     }
 }

nuttx/libxx/libxx_internal.hxx

@@ -0,0 +1,67 @@
+//***************************************************************************
+// lib/libxx_internal.h
+//
+//   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+//   Author: Gregory Nutt <gnutt@nuttx.org>
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//
+// 1. Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in
+//    the documentation and/or other materials provided with the
+//    distribution.
+// 3. Neither the name NuttX nor the names of its contributors may be
+//    used to endorse or promote products derived from this software
+//    without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+// OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+// AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//***************************************************************************
+
+#ifndef __LIBXX_LIBXX_INTERNAL_HXX
+#define __LIBXX_LIBXX_INTERNAL_HXX
+
+//***************************************************************************
+// Included Files
+//***************************************************************************
+
+#include <nuttx/config.h>
+
+//***************************************************************************
+// Definitions
+//***************************************************************************
+
+//***************************************************************************
+// Public Types
+//***************************************************************************/
+
+typedef CODE void (*__cxa_exitfunc_t)(void *arg);
+
+//***************************************************************************
+// Public Variables
+//***************************************************************************
+
+extern "C" FAR void *__dso_handle;
+
+//***************************************************************************
+// Public Function Prototypes
+//***************************************************************************
+
+extern "C" int __cxa_atexit(__cxa_exitfunc_t func, void *arg, void *dso_handle);
+
+#endif // __LIBXX_LIBXX_INTERNAL_HXX

nuttx/sched/Kconfig

@@ -214,12 +214,17 @@ config SCHED_ATEXIT
 config SCHED_ATEXIT_MAX
 	int "Max number of atexit() functions"
 	default 1
-	depends on SCHED_ATEXIT
+	depends on SCHED_ATEXIT && !SCHED_ONEXIT
 	---help---
 		By default if SCHED_ATEXIT is selected, only a single atexit() function
 		is supported. That number can be increased by defined this setting to
 		the number that you require.
 
+		If both SCHED_ONEXIT and SCHED_ATEXIT are selected, then atexit() is built
+		on top of the on_exit() implementation.  In that case, SCHED_ONEXIT_MAX
+		determines the size of the combined number of atexit(0) and on_exit calls
+		and SCHED_ATEXIT_MAX is not used.
+
 config SCHED_ONEXIT
 	bool "Enable on_exit() API"
 	default n
@@ -235,6 +240,10 @@ config SCHED_ONEXIT_MAX
 		is supported. That number can be increased by defined this setting to the
 		number that you require.
 
+		If both SCHED_ONEXIT and SCHED_ATEXIT are selected, then atexit() is built
+		on top of the on_exit() implementation.  In that case, SCHED_ONEXIT_MAX
+		determines the size of the combined number of atexit(0) and on_exit calls.
+
 config USER_ENTRYPOINT
 	string "Application entry point"
 	default "user_start"

nuttx/sched/atexit.c

@@ -96,8 +96,13 @@
  *         CONFIG_SCHED_ATEXIT_MAX defines a larger number.
  *      2. atexit functions are not inherited when a new task is
  *         created.
+ *      3. If both SCHED_ONEXIT and SCHED_ATEXIT are selected, then atexit()
+ *         is built on top of the on_exit() implementation.  In that case,
+ *         CONFIG_SCHED_ONEXIT_MAX determines the size of the combined
+ *         number of atexit(0) and on_exit calls and SCHED_ATEXIT_MAX is
+ *         not used.
  *
- * Parameters:
+ * Input Parameters:
  *   func - A pointer to the function to be called when the task exits.
  *
  * Return Value:
@@ -107,7 +112,14 @@
 
 int atexit(void (*func)(void))
 {
-#if defined(CONFIG_SCHED_ATEXIT_MAX) && CONFIG_SCHED_ATEXIT_MAX > 1
+#if defined(CONFIG_SCHED_ONEXIT)
+  /* atexit is equivalent to on_exit() with no argument (Assuming that the ABI
+   * can handle a callback function that recieves more parameters than it expects).
+   */
+
+  return on_exit(onexitfunc_t func, NULL);
+
+#elif defined(CONFIG_SCHED_ATEXIT_MAX) && CONFIG_SCHED_ATEXIT_MAX > 1
   _TCB *tcb = (_TCB*)g_readytorun.head;
   int   index;
   int   ret = ERROR;

nuttx/sched/on_exit.c

@@ -117,7 +117,7 @@ int on_exit(CODE void (*func)(int, FAR void *), FAR void *arg)
 #if defined(CONFIG_SCHED_ONEXIT_MAX) && CONFIG_SCHED_ONEXIT_MAX > 1
   _TCB *tcb = (_TCB*)g_readytorun.head;
   int   index;
-  int   ret = ERROR;
+  int   ret = ENOSPC;
 
   /* The following must be atomic */
 
@@ -131,7 +131,6 @@ int on_exit(CODE void (*func)(int, FAR void *), FAR void *arg)
        * indices.
        */
 
-      available = -1;
       for (index = 0; index < CONFIG_SCHED_ONEXIT_MAX; index++)
         {
           if (!tcb->onexitfunc[index])
@@ -149,7 +148,7 @@ int on_exit(CODE void (*func)(int, FAR void *), FAR void *arg)
   return ret;
 #else
   _TCB *tcb = (_TCB*)g_readytorun.head;
-  int   ret = ERROR;
+  int   ret = ENOSPC;
 
   /* The following must be atomic */
 

nuttx/sched/task_exithook.c

@@ -82,7 +82,7 @@
  *
  ****************************************************************************/
 
-#ifdef CONFIG_SCHED_ATEXIT
+#if defined(CONFIG_SCHED_ATEXIT) && !defined(CONFIG_SCHED_ONEXIT)
 static inline void task_atexit(FAR _TCB *tcb)
 {
 #if defined(CONFIG_SCHED_ATEXIT_MAX) && CONFIG_SCHED_ATEXIT_MAX > 1