1 files changed, 239 insertions, 0 deletions
diff --git a/src/grt/config/pthread.c b/src/grt/config/pthread.c
new file mode 100644
index 0000000..189ae90
--- /dev/null
+++ b/src/grt/config/pthread.c
@@ -0,0 +1,239 @@
+/*  GRT stack implementation based on pthreads.
+    Copyright (C) 2003 - 2014 Felix Bertram & Tristan Gingold.
+
+    GHDL 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.
+
+    GHDL 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 GCC; see the file COPYING.  If not, write to the Free
+    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+    02111-1307, USA.
+*/
+//-----------------------------------------------------------------------------
+// Project:     GHDL - VHDL Simulator
+// Description: pthread port of stacks package, for use with MacOSX
+// Note:        Tristan's original i386/Linux used assembly-code
+//              to manually switch stacks for performance reasons.
+// History:     2003may22, FB, created.
+//-----------------------------------------------------------------------------
+
+#include <pthread.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <setjmp.h>
+#include <assert.h>
+
+//#define INFO printf
+#define INFO (void)
+
+// GHDL names an endless loop calling FUNC with ARG a 'stack'
+// at a given time, only one stack may be 'executed'
+typedef struct
+{
+  pthread_t           thread;         // stack's thread
+  pthread_mutex_t     mutex;          // mutex to suspend/resume thread
+#if defined(__CYGWIN__)
+  pthread_mutexattr_t mxAttr;
+#endif
+  void                (*Func)(void*); // stack's FUNC
+  void*               Arg;            // ARG passed to FUNC
+} Stack_Type_t, *Stack_Type;
+
+static Stack_Type_t      main_stack_context;
+static Stack_Type_t	 *current;
+extern void grt_set_main_stack (Stack_Type_t *stack);
+
+//----------------------------------------------------------------------------
+void grt_stack_init(void)
+// Initialize the stacks package.
+// This may adjust stack sizes.
+// Must be called after grt.options.decode.
+// => procedure Stack_Init;
+{
+  int res;
+  INFO("grt_stack_init\n");
+  INFO("  main_stack_context=0x%08x\n", &main_stack_context);
+
+
+#if defined(__CYGWIN__)
+  res = pthread_mutexattr_init (&main_stack_context.mxAttr);
+  assert (res == 0);
+  res = pthread_mutexattr_settype (&main_stack_context.mxAttr,
+				   PTHREAD_MUTEX_DEFAULT);
+  assert (res == 0);
+  res = pthread_mutex_init (&main_stack_context.mutex,
+			    &main_stack_context.mxAttr);
+  assert (res == 0);
+#else
+  res = pthread_mutex_init (&main_stack_context.mutex, NULL);
+  assert (res == 0);
+#endif
+  // lock the mutex, as we are currently running
+  res = pthread_mutex_lock (&main_stack_context.mutex);
+  assert (res == 0);
+
+  current = &main_stack_context;
+
+  grt_set_main_stack (&main_stack_context);
+}
+
+//----------------------------------------------------------------------------
+static void* grt_stack_loop(void* pv_myStack)
+{
+  Stack_Type myStack= (Stack_Type)pv_myStack;
+
+  INFO("grt_stack_loop\n");
+
+  INFO("  myStack=0x%08x\n", myStack);
+
+  // block until mutex becomes available again.
+  // this happens when this stack is enabled for the first time
+  pthread_mutex_lock(&(myStack->mutex));
+
+  // run stack's function in endless loop
+  while(1)
+    {
+      INFO("  call 0x%08x with 0x%08x\n", myStack->Func, myStack->Arg);
+      myStack->Func(myStack->Arg);
+    }
+
+  // we never get here...
+  return 0;
+}
+
+//----------------------------------------------------------------------------
+Stack_Type grt_stack_create(void* Func, void* Arg)
+// Create a new stack, which on first execution will call FUNC with
+// an argument ARG.
+// => function Stack_Create (Func : Address; Arg : Address) return Stack_Type;
+{
+  Stack_Type newStack;
+  int res;
+
+  INFO("grt_stack_create\n");
+  INFO("  call 0x%08x with 0x%08x\n", Func, Arg);
+
+  newStack = malloc (sizeof(Stack_Type_t));
+
+  // init function and argument
+  newStack->Func = Func;
+  newStack->Arg = Arg;
+
+  // create mutex
+#if defined(__CYGWIN__)
+  res = pthread_mutexattr_init (&newStack->mxAttr);
+  assert (res == 0);
+  res = pthread_mutexattr_settype (&newStack->mxAttr, PTHREAD_MUTEX_DEFAULT);
+  assert (res == 0);
+  res = pthread_mutex_init (&newStack->mutex, &newStack->mxAttr);
+  assert (res == 0);
+#else
+  res = pthread_mutex_init (&newStack->mutex, NULL);
+  assert (res == 0);
+#endif
+
+  // block the mutex, so that thread will blocked in grt_stack_loop
+  res = pthread_mutex_lock (&newStack->mutex);
+  assert (res == 0);
+
+  INFO("  newStack=0x%08x\n", newStack);
+
+  // create thread, which executes grt_stack_loop
+  pthread_create (&newStack->thread, NULL, grt_stack_loop, newStack);
+
+  return newStack;
+}
+
+static int need_longjmp;
+static int run_env_en;
+static jmp_buf run_env;
+
+//----------------------------------------------------------------------------
+void grt_stack_switch(Stack_Type To, Stack_Type From)
+// Resume stack TO and save the current context to the stack pointed by
+// CUR.
+// => procedure Stack_Switch (To : Stack_Type; From : Stack_Type);
+{
+  int res;
+  INFO("grt_stack_switch\n");
+  INFO("  from 0x%08x to 0x%08x\n", From, To);
+
+  current = To;
+
+  // unlock 'To' mutex. this will make the other thread either
+  // - starts for first time in grt_stack_loop
+  // - resumes at lock below
+  res = pthread_mutex_unlock (&To->mutex);
+  assert (res == 0);
+
+  // block until 'From' mutex becomes available again
+  // as we are running, our mutex is locked and we block here
+  // when stacks are switched, with above unlock, we may proceed
+  res = pthread_mutex_lock (&From->mutex);
+  assert (res == 0);
+
+  if (From == &main_stack_context && need_longjmp != 0)
+    longjmp (run_env, need_longjmp);
+}
+
+//----------------------------------------------------------------------------
+void grt_stack_delete(Stack_Type Stack)
+// Delete stack STACK, which must not be currently executed.
+// => procedure Stack_Delete (Stack : Stack_Type);
+{
+  INFO("grt_stack_delete\n");
+}
+
+void
+__ghdl_maybe_return_via_longjump (int val)
+{
+  if (!run_env_en)
+    return;
+
+  if (current != &main_stack_context)
+    {
+      need_longjmp = val;
+      grt_stack_switch (&main_stack_context, current);
+    }
+  else
+    longjmp (run_env, val);
+}
+
+int
+__ghdl_run_through_longjump (int (*func)(void))
+{
+  int res;
+
+  run_env_en = 1;
+  res = setjmp (run_env);
+  if (res == 0)
+    res = (*func)();
+  run_env_en = 0;
+  return res;
+}
+
+
+//----------------------------------------------------------------------------
+
+#ifndef WITH_GNAT_RUN_TIME
+void __gnat_raise_storage_error(void)
+{
+   abort ();
+}
+
+void __gnat_raise_program_error(void)
+{
+   abort ();
+}
+#endif /* WITH_GNAT_RUN_TIME */
+
+//----------------------------------------------------------------------------
+// end of file
+