Add thc global init and tear down functions.

These are no-ops for now, but we may want to have some global
initialization stuff later.

src/common/thc.c

@@ -1343,6 +1343,18 @@ void thc_done(void) {
 }
 EXPORT_SYMBOL(thc_done);
 
+int thc_global_init(void)
+{
+	return 0; // no-op for now
+}
+EXPORT_SYMBOL(thc_global_init);
+
+void thc_global_fini(void)
+{
+	return; // no-op for now
+}
+EXPORT_SYMBOL(thc_global_fini);
+
 //struct run_args {
 //  int argc;
 //  char **argv;

src/include/thc.h

@@ -245,8 +245,16 @@ typedef void (*THCIdleFn_t)(void *);
 // possibly producing additional AWEs which may be run subsequently.
 typedef struct awe_t awe_t;
 
-// Invoke these to initialize/tear down the thc runtime
+// Invoke this before using any other code in the thc interface
+int thc_global_init(void);
+
+// Invoke this when you are finished using the thc code
+void thc_global_fini(void);
+
+// Invoke this to initialize the context for a *single thread*
 void thc_init(void);
+
+// Invoke this to destroy the context for a *single thread*
 void thc_done(void);
 
 // Finish the current AWE, and initialize (*awe_ptr_ptr) with a pointer