X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fincludes%2FTSO.h;h=56bc726c654df2f440e408b4b7ca43e3e03cec02;hb=85aa72b9dc6803685595936c61f3cab6faab815a;hp=e97875f0dbc0df17c5357f224bafe22b75de5354;hpb=6169525ab2d20cd5814e2797a63649d039759e1e;p=ghc-hetmet.git diff --git a/ghc/includes/TSO.h b/ghc/includes/TSO.h index e97875f..56bc726 100644 --- a/ghc/includes/TSO.h +++ b/ghc/includes/TSO.h @@ -1,5 +1,5 @@ /* ----------------------------------------------------------------------------- - * $Id: TSO.h,v 1.12 2000/03/17 09:53:19 simonmar Exp $ + * $Id: TSO.h,v 1.32 2003/09/21 22:20:53 wolfgang Exp $ * * (c) The GHC Team, 1998-1999 * @@ -11,8 +11,10 @@ #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; @@ -50,6 +52,17 @@ typedef struct { } StgTSOParInfo; #endif /* PAR */ +#if defined(DIST) +typedef struct { + StgThreadPriority priority; + StgInt revalTid; /* ToDo: merge both into 1 word */ + StgInt revalSlot; +} StgTSODistInfo; +#else /* !DIST */ +typedef struct { +} StgTSODistInfo; +#endif /* DIST */ + #if defined(GRAN) typedef StgTSOStatBuf StgTSOGranInfo; #else /* !GRAN */ @@ -72,23 +85,18 @@ 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; @@ -105,6 +113,16 @@ typedef enum { 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 @@ -121,19 +139,37 @@ typedef enum { 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; /* @@ -142,6 +178,10 @@ typedef union { * 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; @@ -149,24 +189,25 @@ typedef struct StgTSO_ { StgMutClosure * mut_link; /* TSO's are mutable of course! */ struct StgTSO_* global_link; /* Links all threads together */ - StgTSOWhatNext whatNext; - StgTSOBlockReason why_blocked; + StgTSOWhatNext what_next : 16; + StgTSOBlockReason why_blocked : 16; StgTSOBlockInfo block_info; struct StgTSO_* blocked_exceptions; StgThreadID id; + int saved_errno; + StgTSOTickyInfo ticky; StgTSOProfInfo prof; StgTSOParInfo par; StgTSOGranInfo gran; - + 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; /* ----------------------------------------------------------------------------- @@ -176,7 +217,6 @@ typedef struct 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. @@ -185,7 +225,7 @@ typedef struct StgTSO_ { (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 @@ -198,17 +238,19 @@ typedef struct StgTSO_ { 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). @@ -223,6 +265,13 @@ typedef struct StgTSO_ { (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. @@ -233,7 +282,7 @@ typedef struct StgTSO_ { 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_))