X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fincludes%2FTSO.h;h=19a162e0366c65064b0d77bf1f838c27ccfcade9;hb=7ff78c251654969f9973c087bec3ae98d5e5b606;hp=2c53ab9b67517cda13caf46cb3e92b1c7511d9ca;hpb=c6ab4bfa09886be3bfff4aa747af2f1c8e348a1f;p=ghc-hetmet.git diff --git a/ghc/includes/TSO.h b/ghc/includes/TSO.h index 2c53ab9..19a162e 100644 --- a/ghc/includes/TSO.h +++ b/ghc/includes/TSO.h @@ -1,5 +1,5 @@ /* ----------------------------------------------------------------------------- - * $Id: TSO.h,v 1.8 1999/08/25 16:11:44 simonmar Exp $ + * $Id: TSO.h,v 1.27 2002/06/26 08:18:41 stolz Exp $ * * (c) The GHC Team, 1998-1999 * @@ -10,6 +10,32 @@ #ifndef TSO_H #define TSO_H +#if defined(GRAN) || defined(PAR) + +#if DEBUG +#define TSO_MAGIC 4321 +#endif + +typedef struct { + StgInt pri; + StgInt magic; + StgInt sparkname; + rtsTime startedat; + rtsBool exported; + StgInt basicblocks; + StgInt allocs; + rtsTime exectime; + rtsTime fetchtime; + rtsTime fetchcount; + rtsTime blocktime; + StgInt blockcount; + rtsTime blockedat; + StgInt globalsparks; + StgInt localsparks; + rtsTime clock; +} StgTSOStatBuf; +#endif + #if defined(PROFILING) typedef struct { CostCentreStack *CCCS; /* thread's current CCS */ @@ -20,14 +46,32 @@ typedef struct { #endif /* PROFILING */ #if defined(PAR) -typedef struct { -} StgTSOParInfo; +typedef StgTSOStatBuf StgTSOParInfo; #else /* !PAR */ typedef struct { } StgTSOParInfo; #endif /* PAR */ -#if defined(TICKY_TICKY) +#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 */ +typedef struct { +} StgTSOGranInfo; +#endif /* GRAN */ + + +#if defined(TICKY) typedef struct { } StgTSOTickyInfo; #else /* !TICKY_TICKY */ @@ -40,20 +84,20 @@ typedef enum { 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 */ + ThreadEnterInterp, /* 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; /* - * 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; @@ -70,6 +114,16 @@ 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 @@ -82,15 +136,24 @@ typedef enum { NotBlocked, BlockedOnMVar, BlockedOnBlackHole, + BlockedOnException, BlockedOnRead, BlockedOnWrite, BlockedOnDelay +#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 +#if defined(RTS_SUPPORTS_THREADS) + , BlockedOnCCall +#endif } StgTSOBlockReason; typedef union { StgClosure *closure; + struct StgTSO_ *tso; int fd; - unsigned int delay; + unsigned int target; } StgTSOBlockInfo; /* @@ -99,31 +162,38 @@ 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; - struct StgTSO_* link; - 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; - /* GranSim Info? */ - + 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; -extern DLL_IMPORT_RTS StgTSO *CurrentTSO; - /* ----------------------------------------------------------------------------- Invariants: @@ -131,7 +201,6 @@ extern DLL_IMPORT_RTS StgTSO *CurrentTSO; 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. @@ -140,28 +209,54 @@ extern DLL_IMPORT_RTS StgTSO *CurrentTSO; (a) smaller than a block, or (b) a multiple of BLOCK_SIZE - tso->link - == END_TSO_QUEUE , iff the thread is currently running. - == (StgTSO *) , otherwise, and it is linked onto either: + tso->why_blocked tso->block_info location + ---------------------------------------------------------------------- + NotBlocked NULL runnable_queue, or running + + BlockedOnBlackHole the BLACKHOLE_BQ the BLACKHOLE_BQ's queue + + BlockedOnMVar the MVAR the MVAR's queue + + BlockedOnException the TSO TSO->blocked_exception + + 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. - - the runnable_queue tso->blocked_on == END_TSO_QUEUE - - the blocked_queue tso->blocked_on == END_TSO_QUEUE - - a BLACKHOLE_BQ, tso->blocked_on == the BLACKHOLE_BQ - - an MVAR, tso->blocked_on == the MVAR - 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). - ---------------------------------------------------------------------------- */ + tso->blocked_exceptions is either: + + NULL if async exceptions are unblocked. + + END_TSO_QUEUE if async exceptions are blocked, but no threads + are currently waiting to deliver. + + (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. * symptom is that (&tso->stack - &tso->header) /= sizeof(StgTSO) @@ -171,7 +266,7 @@ extern DLL_IMPORT_RTS StgTSO *CurrentTSO; 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_))