/* -----------------------------------------------------------------------------
- * $Id: TSO.h,v 1.10 2000/01/13 14:34:01 hwloidl Exp $
+ * $Id: TSO.h,v 1.14 2000/03/20 09:42:49 andy Exp $
*
* (c) The GHC Team, 1998-1999
*
tso_state_stopped
} StgTSOState;
+/*
+ * The what_next field of a TSO indicates how the thread is to be run.
+ */
typedef enum {
- ThreadEnterGHC,
- ThreadRunGHC,
- ThreadEnterHugs,
- ThreadKilled,
- ThreadComplete
+ ThreadEnterGHC, /* enter top thunk on stack */
+ ThreadRunGHC, /* return to address on top of stack */
+ ThreadEnterHugs, /* enter top thunk on stack (w/ interpreter) */
+ ThreadKilled, /* thread has died, don't run it */
+ ThreadRelocated, /* thread has moved, link points to new locn */
+ ThreadComplete /* thread has finished */
} StgTSOWhatNext;
/*
StgClosure *closure;
struct StgTSO_ *tso;
int fd;
+#if defined(INTERPRETER) && !defined(HAVE_SETITIMER)
+ unsigned int target;
+#else
unsigned int delay;
+#endif
#if defined(PAR)
globalAddr ga;
#endif
typedef struct StgTSO_ {
StgHeader header;
- struct StgTSO_* link;
- /* SDM and HWL agree that it would be cool to have a list of all TSOs */
- StgMutClosure * mut_link; /* TSO's are mutable of course! */
- StgTSOWhatNext whatNext;
+
+ struct StgTSO_* link; /* Links threads onto blocking queues */
+ StgMutClosure * mut_link; /* TSO's are mutable of course! */
+ struct StgTSO_* global_link; /* Links all threads together */
+
+ StgTSOWhatNext what_next;
StgTSOBlockReason why_blocked;
StgTSOBlockInfo block_info;
struct StgTSO_* blocked_exceptions;
A zombie thread has the following properties:
- tso->whatNext == ThreadComplete or ThreadKilled
+ tso->what_next == ThreadComplete or ThreadKilled
tso->link == (could be on some queue somewhere)
tso->su == tso->stack + tso->stack_size
tso->sp == tso->stack + tso->stack_size - 1 (i.e. top stack word)
- tso->sp[0] == return value of thread, if whatNext == ThreadComplete,
- exception , if whatNext == ThreadKilled
+ tso->sp[0] == return value of thread, if what_next == ThreadComplete,
+ exception , if what_next == ThreadKilled
(tso->sp is left pointing at the top word on the stack so that
the return value or exception will be retained by a GC).