score: Rework global construction

Ensure that the global construction is performed in the context of the
first initialization thread.  On SMP this was not guaranteed in the
previous implementation.

1 files changed, 94 insertions, 0 deletions

diff --git a/cpukit/score/src/threadglobalconstruction.c b/cpukit/score/src/threadglobalconstruction.c
new file mode 100644
index 0000000000..ff8af51242
--- /dev/null
+++ b/cpukit/score/src/threadglobalconstruction.c
@@ -0,0 +1,94 @@
+/**
+ * @file
+ *
+ * @brief Thread Global Construction
+ *
+ * @ingroup ScoreThread
+ */
+
+/*
+ *  COPYRIGHT (c) 1989-2012.
+ *  On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.org/license/LICENSE.
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/score/threadimpl.h>
+#include <rtems/score/assert.h>
+#include <rtems/rtems/config.h>
+#include <rtems/posix/config.h>
+
+/*
+ *  Conditional magic to determine what style of C++ constructor
+ *  initialization this target and compiler version uses.
+ */
+#if defined(__USE_INIT_FINI__)
+  #if defined(__M32R__)
+    #define INIT_NAME __init
+  #elif defined(__ARM_EABI__)
+    #define INIT_NAME __libc_init_array
+  #else
+    #define INIT_NAME _init
+  #endif
+
+  extern void INIT_NAME(void);
+  #define EXECUTE_GLOBAL_CONSTRUCTORS
+#endif
+
+#if defined(__USE__MAIN__)
+  extern void __main(void);
+  #define INIT_NAME __main
+  #define EXECUTE_GLOBAL_CONSTRUCTORS
+#endif
+
+void *_Thread_Global_construction( void )
+{
+  Thread_Control *executing;
+  Thread_Entry    entry_point;
+
+#if defined(EXECUTE_GLOBAL_CONSTRUCTORS)
+  /*
+   *  _init could be a weak symbol and we SHOULD test it but it isn't
+   *  in any configuration I know of and it generates a warning on every
+   *  RTEMS target configuration.  --joel (12 May 2007)
+   */
+  INIT_NAME();
+#endif
+
+#if defined(RTEMS_POSIX_API)
+  if ( Configuration_RTEMS_API.number_of_initialization_tasks > 0 ) {
+#endif
+    entry_point = (Thread_Entry)
+      Configuration_RTEMS_API.User_initialization_tasks_table[ 0 ].entry_point;
+#if defined(RTEMS_POSIX_API)
+  } else {
+    entry_point = (Thread_Entry)
+      Configuration_POSIX_API
+        .User_initialization_threads_table[ 0 ].thread_entry;
+  }
+#endif
+
+  _Thread_Disable_dispatch();
+
+  executing = _Thread_Executing;
+  executing->Start.entry_point = entry_point;
+
+  _Thread_Restart(
+    executing,
+    executing,
+    executing->Start.pointer_argument,
+    executing->Start.numeric_argument
+  );
+
+  _Thread_Enable_dispatch();
+
+  _Assert_Not_reached();
+
+  return NULL;
+}