Do not #include external header files when compiling via C

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

diff --git a/includes/SMPClosureOps.h b/includes/SMPClosureOps.h
new file mode 100644 (file)
index 0000000..fe78168
--- /dev/null
+++ b/includes/SMPClosureOps.h
@@ -0,0 +1,71 @@
+/* ----------------------------------------------------------------------------
+ *
+ * (c) The GHC Team, 2005
+ *
+ * Macros for THREADED_RTS support
+ *
+ * -------------------------------------------------------------------------- */
+
+#ifndef SMPCLOSUREOPS_H
+#define SMPCLOSUREOPS_H
+
+#if defined(THREADED_RTS)
+
+/* -----------------------------------------------------------------------------
+ * Locking/unlocking closures
+ *
+ * This is used primarily in the implementation of MVars.
+ * -------------------------------------------------------------------------- */
+
+#define SPIN_COUNT 4000
+
+#ifdef KEEP_LOCKCLOSURE
+// We want a callable copy of lockClosure() so that we can refer to it
+// from .cmm files compiled using the native codegen.
+extern StgInfoTable *lockClosure(StgClosure *p);
+INLINE_ME
+#else
+INLINE_HEADER
+#endif
+StgInfoTable *
+lockClosure(StgClosure *p)
+{
+    StgWord info;
+    do {
+       nat i = 0;
+       do {
+           info = xchg((P_)(void *)&p->header.info, (W_)&stg_WHITEHOLE_info);
+           if (info != (W_)&stg_WHITEHOLE_info) return (StgInfoTable *)info;
+       } while (++i < SPIN_COUNT);
+       yieldThread();
+    } while (1);
+}
+
+INLINE_HEADER void
+unlockClosure(StgClosure *p, const StgInfoTable *info)
+{
+    // This is a strictly ordered write, so we need a write_barrier():
+    write_barrier();
+    p->header.info = info;
+}
+
+#else /* !THREADED_RTS */
+
+INLINE_HEADER StgInfoTable *
+lockClosure(StgClosure *p)
+{ return (StgInfoTable *)p->header.info; }
+
+INLINE_HEADER void
+unlockClosure(StgClosure *p STG_UNUSED, const StgInfoTable *info STG_UNUSED)
+{ /* nothing */ }
+
+#endif /* THREADED_RTS */
+
+// Handy specialised versions of lockClosure()/unlockClosure()
+INLINE_HEADER void lockTSO(StgTSO *tso)
+{ lockClosure((StgClosure *)tso); }
+
+INLINE_HEADER void unlockTSO(StgTSO *tso)
+{ unlockClosure((StgClosure*)tso, (const StgInfoTable *)&stg_TSO_info); }
+
+#endif /* SMPCLOSUREOPS_H */