/* -----------------------------------------------------------------------------
- * $Id: TSO.h,v 1.34 2004/03/01 14:18:35 simonmar Exp $
+ * $Id: TSO.h,v 1.35 2004/08/13 13:09:40 simonmar Exp $
*
* (c) The GHC Team, 1998-1999
*
} StgTSOStatBuf;
#endif
-#if defined(PROFILING)
+/*
+ * PROFILING info in a TSO
+ */
typedef struct {
CostCentreStack *CCCS; /* thread's current CCS */
} StgTSOProfInfo;
-#else /* !PROFILING */
-# if defined(SUPPORTS_EMPTY_STRUCTS)
-typedef struct {
- /* empty */
-} StgTSOProfInfo;
-# endif
-#endif /* PROFILING */
-#if defined(PAR)
+/*
+ * PAR info in a TSO
+ */
+#ifdef PAR
typedef StgTSOStatBuf StgTSOParInfo;
-#else /* !PAR */
-# if defined(SUPPORTS_EMPTY_STRUCTS)
+#else
+#ifdef SUPPORTS_EMPTY_STRUCTS
typedef struct {
- /* empty */
+ /* empty */
} StgTSOParInfo;
-# endif
-#endif /* PAR */
+#endif
+#endif
-#if defined(DIST)
+/*
+ * DIST info in a TSO
+ */
+#ifdef DIST
typedef struct {
StgThreadPriority priority;
StgInt revalTid; /* ToDo: merge both into 1 word */
StgInt revalSlot;
} StgTSODistInfo;
-#else /* !DIST */
-# if defined(SUPPORTS_EMPTY_STRUCTS)
+#else
+#ifdef SUPPORTS_EMPTY_STRUCTS
typedef struct {
- /* empty */
+ /* empty */
} StgTSODistInfo;
-# endif
-#endif /* DIST */
+#endif
+#endif
-#if defined(GRAN)
+/*
+ * GRAN info in a TSO
+ */
+#ifdef GRAN
typedef StgTSOStatBuf StgTSOGranInfo;
-#else /* !GRAN */
-# if defined(SUPPORTS_EMPTY_STRUCTS)
+#else
+#ifdef SUPPORTS_EMPTY_STRUCTS
typedef struct {
- /* empty */
+ /* empty */
} StgTSOGranInfo;
-# endif
-#endif /* GRAN */
-
+#endif
+#endif
-#if defined(TICKY)
-typedef struct {
-} StgTSOTickyInfo;
-#else /* !TICKY_TICKY */
-# if defined(SUPPORTS_EMPTY_STRUCTS)
+/*
+ * TICKY_TICKY info in a TSO
+ */
+#ifdef SUPPORTS_EMPTY_STRUCTS
typedef struct {
/* empty */
} StgTSOTickyInfo;
-# endif
-#endif /* TICKY_TICKY */
-
-typedef enum {
- tso_state_runnable,
- tso_state_stopped
-} StgTSOState;
-
-/*
- * The what_next field of a TSO indicates how the thread is to be run.
- */
-typedef enum {
- ThreadRunGHC, /* return to address on top of stack */
- 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;
+#endif
/*
* Thread IDs are 32 bits.
typedef StgWord32 StgThreadID;
/*
- * This type is returned to the scheduler by a thread that has
- * stopped for one reason or another.
+ * Type returned after running a thread. Values of this type
+ * include HeapOverflow, StackOverflow etc. See Constants.h for the
+ * full list.
*/
-
-typedef enum {
- HeapOverflow, /* might also be StackOverflow */
- StackOverflow,
- ThreadYielding,
- ThreadBlocked,
- ThreadFinished
-} StgThreadReturnCode;
+typedef unsigned int StgThreadReturnCode;
/*
* We distinguish between the various classes of threads in the system.
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
- * further info (such as the closure the thread is blocked on, or the
- * file descriptor if the thread is waiting on I/O) in the block_info
- * field.
- */
-
-typedef enum {
- NotBlocked,
- BlockedOnMVar,
- BlockedOnBlackHole,
- BlockedOnException,
- 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_NoSend // same as above but without sending a Fetch message
-#endif
- , BlockedOnCCall
- , BlockedOnCCall_NoUnblockExc // same as above but don't unblock
- // async exceptions in resumeThread()
-} StgTSOBlockReason;
-
#if defined(mingw32_TARGET_OS)
/* results from an async I/O request + it's ID. */
typedef struct {
*/
/*
+ * Threads may be blocked for several reasons. A blocked thread will
+ * have the reason in the why_blocked field of the TSO, and some
+ * further info (such as the closure the thread is blocked on, or the
+ * file descriptor if the thread is waiting on I/O) in the block_info
+ * field.
+ */
+
+/*
* ToDo: make this structure sensible on a non-32-bit arch.
*/
typedef struct StgTSO_ {
StgHeader header;
- 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 */
+ 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;
- int saved_errno;
- struct StgMainThread_* main;
+ StgWord16 what_next; // Values defined in Constants.h
+ StgWord16 why_blocked; // Values defined in Constants.h
+ StgTSOBlockInfo block_info;
+ struct StgTSO_* blocked_exceptions;
+ StgThreadID id;
+ int saved_errno;
+#ifdef TICKY_TICKY
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)
-
+#endif
+#ifdef PROFILING
+ StgTSOProfInfo prof;
+#endif
+
+ 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* */
#define TSO_STRUCT_SIZEW (TSO_STRUCT_SIZE / sizeof(W_))
+
+/* this is the NIL ptr for a TSO queue (e.g. runnable queue) */
+#define END_TSO_QUEUE ((StgTSO *)(void*)&stg_END_TSO_QUEUE_closure)
+
+#if defined(PAR) || defined(GRAN)
+/* this is the NIL ptr for a blocking queue */
+# define END_BQ_QUEUE ((StgBlockingQueueElement *)(void*)&stg_END_TSO_QUEUE_closure)
+/* this is the NIL ptr for a blocked fetch queue (as in PendingFetches in GUM) */
+# define END_BF_QUEUE ((StgBlockedFetch *)(void*)&stg_END_TSO_QUEUE_closure)
+#endif
+/* ToDo?: different name for end of sleeping queue ? -- HWL */
+
#endif /* TSO_H */
projects / ghc-hetmet.git / blobdiff