/* -----------------------------------------------------------------------------
- * $Id: TSO.h,v 1.11 2000/01/22 18:00:03 simonmar Exp $
+ * $Id: TSO.h,v 1.33 2003/11/12 17:27:05 sof Exp $
*
* (c) The GHC Team, 1998-1999
*
#define TSO_H
#if defined(GRAN) || defined(PAR)
-// magic marker for TSOs; debugging only
+
+#if DEBUG
#define TSO_MAGIC 4321
+#endif
typedef struct {
StgInt pri;
CostCentreStack *CCCS; /* thread's current CCS */
} StgTSOProfInfo;
#else /* !PROFILING */
+# if defined(SUPPORTS_EMPTY_STRUCTS)
typedef struct {
+ /* empty */
} StgTSOProfInfo;
+# endif
#endif /* PROFILING */
#if defined(PAR)
typedef StgTSOStatBuf StgTSOParInfo;
#else /* !PAR */
+# if defined(SUPPORTS_EMPTY_STRUCTS)
typedef struct {
+ /* empty */
} StgTSOParInfo;
+# endif
#endif /* PAR */
+#if defined(DIST)
+typedef struct {
+ StgThreadPriority priority;
+ StgInt revalTid; /* ToDo: merge both into 1 word */
+ StgInt revalSlot;
+} StgTSODistInfo;
+#else /* !DIST */
+# if defined(SUPPORTS_EMPTY_STRUCTS)
+typedef struct {
+ /* empty */
+} StgTSODistInfo;
+# endif
+#endif /* DIST */
+
#if defined(GRAN)
typedef StgTSOStatBuf StgTSOGranInfo;
#else /* !GRAN */
+# if defined(SUPPORTS_EMPTY_STRUCTS)
typedef struct {
+ /* empty */
} StgTSOGranInfo;
+# endif
#endif /* GRAN */
typedef struct {
} StgTSOTickyInfo;
#else /* !TICKY_TICKY */
+# if defined(SUPPORTS_EMPTY_STRUCTS)
typedef struct {
+ /* empty */
} StgTSOTickyInfo;
+# endif
#endif /* TICKY_TICKY */
typedef enum {
} StgTSOState;
/*
- * The whatNext field of a TSO indicates how the thread is to be run.
+ * The what_next field of a TSO indicates how the thread is to be run.
*/
typedef enum {
- ThreadEnterGHC, /* enter top thunk on stack */
ThreadRunGHC, /* return to address on top of stack */
- ThreadEnterHugs, /* enter top thunk on stack (w/ interpreter) */
+ ThreadInterpret, /* interpret this thread */
ThreadKilled, /* thread has died, don't run it */
ThreadRelocated, /* thread has moved, link points to new locn */
ThreadComplete /* thread has finished */
} StgTSOWhatNext;
/*
- * We are completely paranoid and make thread IDs 64 bits to avoid
- * having to worry about overflow. A little calculation shows that
- * even doing 10^6 forks per second would take 35 million years to
- * overflow a 64 bit thread ID :-)
- *
+ * Thread IDs are 32 bits.
*/
typedef StgWord32 StgThreadID;
ThreadFinished
} StgThreadReturnCode;
+/*
+ * We distinguish between the various classes of threads in the system.
+ */
+
+typedef enum {
+ AdvisoryPriority,
+ MandatoryPriority,
+ RevalPriority
+} StgThreadPriority;
+
/*
* Threads may be blocked for several reasons. A blocked thread will
* have the reason in the why_blocked field of the TSO, and some
BlockedOnRead,
BlockedOnWrite,
BlockedOnDelay
+#if defined(mingw32_TARGET_OS)
+ , BlockedOnDoProc
+#endif
#if defined(PAR)
- , BlockedOnGA // blocked on a remote closure represented by a Global Address
+ , BlockedOnGA // blocked on a remote closure represented by a Global Address
+ , BlockedOnGA_NoSend // same as above but without sending a Fetch message
+#endif
+#if defined(RTS_SUPPORTS_THREADS)
+ , BlockedOnCCall
+ , BlockedOnCCall_NoUnblockExc // same as above but don't unblock async exceptions
+ // in resumeThread()
#endif
} StgTSOBlockReason;
+#if defined(mingw32_TARGET_OS)
+/* results from an async I/O request + it's ID. */
+typedef struct {
+ unsigned int reqID;
+ int len;
+ int errCode;
+} StgAsyncIOResult;
+#endif
+
typedef union {
StgClosure *closure;
struct StgTSO_ *tso;
int fd;
- unsigned int delay;
-#if defined(PAR)
- globalAddr ga;
+#if defined(mingw32_TARGET_OS)
+ StgAsyncIOResult* async_result;
#endif
+ unsigned int target;
} StgTSOBlockInfo;
/*
* storage manager, and won't be copied during garbage collection.
*/
+/*
+ * ToDo: make this structure sensible on a non-32-bit arch.
+ */
+
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;
- StgTSOBlockReason why_blocked;
+
+ 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 : 16;
+ StgTSOBlockReason why_blocked : 16;
StgTSOBlockInfo block_info;
struct StgTSO_* blocked_exceptions;
StgThreadID id;
- StgTSOTickyInfo ticky;
- StgTSOProfInfo prof;
- StgTSOParInfo par;
- StgTSOGranInfo gran;
-
+ int saved_errno;
+
+ MAYBE_EMPTY_STRUCT(StgTSOTickyInfo,ticky)
+ MAYBE_EMPTY_STRUCT(StgTSOProfInfo,prof)
+ MAYBE_EMPTY_STRUCT(StgTSOParInfo,par)
+ MAYBE_EMPTY_STRUCT(StgTSOGranInfo,gran)
+ MAYBE_EMPTY_STRUCT(StgTSODistInfo,dist)
+
/* The thread stack... */
StgWord stack_size; /* stack size in *words* */
StgWord max_stack_size; /* maximum stack size in *words* */
StgPtr sp;
- StgUpdateFrame* su;
- StgPtr splim;
- StgWord stack[0];
+ StgWord stack[FLEXIBLE_ARRAY];
} StgTSO;
/* -----------------------------------------------------------------------------
tso->stack < tso->sp < tso->stack+tso->stack_size
tso->stack_size <= tso->max_stack_size
- tso->splim == tso->stack + RESERVED_STACK_WORDS;
RESERVED_STACK_WORDS is large enough for any heap-check or
stack-check failure.
(a) smaller than a block, or
(b) a multiple of BLOCK_SIZE
- tso->block_reason tso->block_info location
+ tso->why_blocked tso->block_info location
----------------------------------------------------------------------
NotBlocked NULL runnable_queue, or running
BlockedOnRead NULL blocked_queue
BlockedOnWrite NULL blocked_queue
BlockedOnDelay NULL blocked_queue
+ BlockedOnGA closure TSO blocks on BQ of that closure
+ BlockedOnGA_NoSend closure TSO blocks on BQ of that closure
tso->link == END_TSO_QUEUE, if the thread is currently running.
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).
(StgTSO *)tso if threads are currently awaiting delivery of
exceptions to this thread.
+ The 2 cases BlockedOnGA and BlockedOnGA_NoSend are needed in a GUM
+ setup only. They mark a TSO that has entered a FETCH_ME or
+ FETCH_ME_BQ closure, respectively; only the first TSO hitting the
+ closure will send a Fetch message.
+ Currently we have no separate code for blocking on an RBH; we use the
+ BlockedOnBlackHole case for that. -- HWL
+
---------------------------------------------------------------------------- */
/* Workaround for a bug/quirk in gcc on certain architectures.
extern StgTSO dummy_tso;
#define TSO_STRUCT_SIZE \
- ((int)&(dummy_tso).stack - (int)&(dummy_tso).header)
+ ((char *)&dummy_tso.stack - (char *)&dummy_tso.header)
#define TSO_STRUCT_SIZEW (TSO_STRUCT_SIZE / sizeof(W_))
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