Reorganisation of the source tree

[ghc-hetmet.git] / rts / Main.c

diff --git a/rts/Main.c b/rts/Main.c
new file mode 100644 (file)
index 0000000..6aef280
--- /dev/null
+++ b/rts/Main.c
@@ -0,0 +1,138 @@
+/* -----------------------------------------------------------------------------
+ *
+ * (c) The GHC Team 1998-2000
+ *
+ * Main function for a standalone Haskell program.
+ *
+ * ---------------------------------------------------------------------------*/
+
+#define COMPILING_RTS_MAIN
+
+#include "PosixSource.h"
+#include "Rts.h"
+#include "RtsAPI.h"
+#include "SchedAPI.h"
+#include "Schedule.h"
+#include "RtsFlags.h"
+#include "RtsUtils.h"
+#include "Prelude.h"
+#include "Task.h"
+#include <stdlib.h>
+
+#ifdef DEBUG
+# include "Printer.h"   /* for printing        */
+#endif
+
+#ifdef PAR
+# include "Parallel.h"
+# include "ParallelRts.h"
+# include "LLC.h"
+#endif
+
+#if defined(GRAN) || defined(PAR)
+# include "GranSimRts.h"
+#endif
+
+#ifdef HAVE_WINDOWS_H
+# include <windows.h>
+#endif
+
+extern void __stginit_ZCMain(void);
+
+/* Hack: we assume that we're building a batch-mode system unless 
+ * INTERPRETER is set
+ */
+#ifndef INTERPRETER /* Hack */
+int main(int argc, char *argv[])
+{
+    int exit_status;
+    SchedulerStatus status;
+    /* all GranSim/GUM init is done in startupHaskell; sets IAmMainThread! */
+
+    startupHaskell(argc,argv,__stginit_ZCMain);
+
+    /* kick off the computation by creating the main thread with a pointer
+       to mainIO_closure representing the computation of the overall program;
+       then enter the scheduler with this thread and off we go;
+      
+       the same for GranSim (we have only one instance of this code)
+
+       in a parallel setup, where we have many instances of this code
+       running on different PEs, we should do this only for the main PE
+       (IAmMainThread is set in startupHaskell) 
+    */
+
+#  if defined(PAR)
+
+#   if defined(DEBUG)
+    { /* a wait loop to allow attachment of gdb to UNIX threads */
+      nat i, j, s;
+
+      for (i=0, s=0; i<(nat)RtsFlags.ParFlags.wait; i++)
+       for (j=0; j<1000000; j++) 
+         s += j % 65536;
+    }
+    IF_PAR_DEBUG(verbose,
+                belch("Passed wait loop"));
+#   endif
+
+    if (IAmMainThread == rtsTrue) {
+      IF_PAR_DEBUG(verbose,
+                  debugBelch("==== [%x] Main Thread Started ...\n", mytid));
+
+      /* ToDo: Dump event for the main thread */
+      status = rts_mainLazyIO((HaskellObj)mainIO_closure, NULL);
+    } else {
+      /* Just to show we're alive */
+      IF_PAR_DEBUG(verbose,
+                  debugBelch("== [%x] Non-Main PE enters scheduler via taskStart() without work ...\n",
+                          mytid));
+     
+      /* all non-main threads enter the scheduler without work */
+      taskStart();       
+      status = Success;  // declare victory (see shutdownParallelSystem)
+    }
+
+#  elif defined(GRAN)
+
+    /* ToDo: Dump event for the main thread */
+    status = rts_mainLazyIO(mainIO_closure, NULL);
+
+#  else /* !PAR && !GRAN */
+
+    /* ToDo: want to start with a larger stack size */
+    { 
+       void *cap = rts_lock();
+       cap = rts_evalLazyIO(cap,(HaskellObj)(void *)mainIO_closure, NULL);
+       status = rts_getSchedStatus(cap);
+       rts_unlock(cap);
+    }
+
+#  endif /* !PAR && !GRAN */
+
+    /* check the status of the entire Haskell computation */
+    switch (status) {
+    case Killed:
+      errorBelch("main thread exited (uncaught exception)");
+      exit_status = EXIT_KILLED;
+      break;
+    case Interrupted:
+      errorBelch("interrupted");
+      exit_status = EXIT_INTERRUPTED;
+      break;
+    case Success:
+      exit_status = EXIT_SUCCESS;
+      break;
+#if defined(PAR)
+    case NoStatus:
+      errorBelch("main thread PE killed; probably due to failure of another PE; check /tmp/pvml...");
+      exit_status = EXIT_KILLED;
+      break;
+#endif 
+    default:
+      barf("main thread completed with invalid status");
+    }
+    shutdownHaskellAndExit(exit_status);
+    return 0; /* never reached, keep gcc -Wall happy */
+}
+# endif /* BATCH_MODE */