From c094c3adb595d0f6fd881c6d7502291df4728cd8 Mon Sep 17 00:00:00 2001
From: simonmar <unknown>
Date: Thu, 8 Nov 2001 16:17:35 +0000
Subject: [PATCH] [project @ 2001-11-08 16:17:35 by simonmar] Revert
 resumeThread and suspendThread to working with StgRegTable
 rather than Capability, and do the conversion in the
 functions themselves rather than in the inline code.  This
 means I don't have to fiddle with the NCG to fix the
 SUSPEND_THREAD/RESUME_THREAD macros.

---
 ghc/includes/StgMacros.h |   13 +++++--------
 ghc/rts/Schedule.c       |   12 ++++++++----
 2 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/ghc/includes/StgMacros.h b/ghc/includes/StgMacros.h
index 6f35a55..5f28554 100644
--- a/ghc/includes/StgMacros.h
+++ b/ghc/includes/StgMacros.h
@@ -1,5 +1,5 @@
 /* -----------------------------------------------------------------------------
- * $Id: StgMacros.h,v 1.39 2001/11/08 12:46:31 simonmar Exp $
+ * $Id: StgMacros.h,v 1.40 2001/11/08 16:17:35 simonmar Exp $
  *
  * (c) The GHC Team, 1998-1999
  *
@@ -784,20 +784,17 @@ LoadThreadState (void)
  * Suspending/resuming threads for doing external C-calls (_ccall_GC).
  * These functions are defined in rts/Schedule.c.
  */
-StgInt       suspendThread ( Capability *cap );
-Capability * resumeThread  ( StgInt );
+StgInt        suspendThread ( StgRegTable * );
+StgRegTable * resumeThread  ( StgInt );
 
 #define SUSPEND_THREAD(token)			\
    SaveThreadState();				\
-   token = suspendThread((Capability *)((void *)BaseReg - sizeof(StgFunTable)));
+   token = suspendThread(BaseReg);
 
 #ifdef SMP
 #define RESUME_THREAD(token)			\
-  { Capability c;				\
-    c = resumeThread(token);			\
-    BaseReg = &c.r;				\
+    BaseReg = resumeThread(token);		\
     LoadThreadState();				\
-  }
 #else
 #define RESUME_THREAD(token)			\
    (void)resumeThread(token);			\
diff --git a/ghc/rts/Schedule.c b/ghc/rts/Schedule.c
index 3371bad..ec0ac22 100644
--- a/ghc/rts/Schedule.c
+++ b/ghc/rts/Schedule.c
@@ -1,5 +1,5 @@
 /* ---------------------------------------------------------------------------
- * $Id: Schedule.c,v 1.105 2001/11/08 12:46:31 simonmar Exp $
+ * $Id: Schedule.c,v 1.106 2001/11/08 16:17:35 simonmar Exp $
  *
  * (c) The GHC Team, 1998-2000
  *
@@ -1356,9 +1356,13 @@ void deleteAllThreads ( void )
  * ------------------------------------------------------------------------- */
    
 StgInt
-suspendThread( Capability *cap )
+suspendThread( StgRegTable *reg )
 {
   nat tok;
+  Capability *cap;
+
+  // assume that *reg is a pointer to the StgRegTable part of a Capability
+  cap = (Capability *)((void *)reg - sizeof(StgFunTable));
 
   ACQUIRE_LOCK(&sched_mutex);
 
@@ -1382,7 +1386,7 @@ suspendThread( Capability *cap )
   return tok; 
 }
 
-Capability *
+StgRegTable *
 resumeThread( StgInt tok )
 {
   StgTSO *tso, **prev;
@@ -1420,7 +1424,7 @@ resumeThread( StgInt tok )
   cap->r.rCurrentTSO = tso;
 
   RELEASE_LOCK(&sched_mutex);
-  return cap;
+  return &cap->r;
 }
 
 
-- 
1.7.10.4