Under utils/ext-core, update README to mention that ext-core is now on Hackage

[ghc-hetmet.git] / includes / RtsAPI.h

diff --git a/includes/RtsAPI.h b/includes/RtsAPI.h
index 41f0fc0..ff2bc11 100644 (file)
--- a/includes/RtsAPI.h
+++ b/includes/RtsAPI.h
@@ -4,6 +4,9 @@
  *
  * API for invoking Haskell functions via the RTS
  *
+ * To understand the structure of the RTS headers, see the wiki:
+ *   http://hackage.haskell.org/trac/ghc/wiki/Commentary/SourceTree/Includes
+ *
  * --------------------------------------------------------------------------*/
 
 #ifndef RTSAPI_H
@@ -26,7 +29,7 @@ typedef enum {
     HeapExhausted /* out of memory */
 } SchedulerStatus;
 
-typedef StgClosure *HaskellObj;
+typedef struct StgClosure_ *HaskellObj;
 
 /*
  * An abstract type representing the token returned by rts_lock() and
@@ -66,6 +69,15 @@ Capability *rts_lock (void);
 // releases the token acquired with rts_lock().
 void rts_unlock (Capability *token);
 
+// If you are in a context where you know you have a current capability but
+// do not know what it is, then use this to get it. Basically this only
+// applies to "unsafe" foreign calls (as unsafe foreign calls are made with
+// the capability held).
+//
+// WARNING: There is *no* guarantee this returns anything sensible (eg NULL)
+// when there is no current capability.
+Capability *rts_unsafeGetMyCapability (void);
+
 /* ----------------------------------------------------------------------------
    Building Haskell objects from C datatypes.
    ------------------------------------------------------------------------- */