X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fincludes%2FTSO.h;h=06e8636ab52f2676039466d052b3313324040bcf;hb=c1f3fad183f553aa46ec9dea33999f387014fded;hp=d898bc71f92945c5f677cdee4d059bfd14f2f2a3;hpb=21462c00b3241f15de3b145ac92ee5b266b5733a;p=ghc-hetmet.git diff --git a/ghc/includes/TSO.h b/ghc/includes/TSO.h index d898bc7..06e8636 100644 --- a/ghc/includes/TSO.h +++ b/ghc/includes/TSO.h @@ -1,5 +1,5 @@ /* ----------------------------------------------------------------------------- - * $Id: TSO.h,v 1.5 1999/03/02 19:44:22 sof Exp $ + * $Id: TSO.h,v 1.26 2002/04/10 11:43:44 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 */ @@ -20,40 +46,58 @@ typedef struct { #endif /* PROFILING */ #if defined(PAR) -typedef struct { -} StgTSOParInfo; +typedef StgTSOStatBuf StgTSOParInfo; #else /* !PAR */ 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 */ +typedef struct { +} StgTSOGranInfo; +#endif /* GRAN */ + + #if defined(TICKY) typedef struct { } StgTSOTickyInfo; -#else /* !TICKY */ +#else /* !TICKY_TICKY */ typedef struct { } StgTSOTickyInfo; -#endif /* TICKY */ +#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 { - 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; @@ -71,36 +115,151 @@ typedef enum { } 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 + * 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(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 target; +} StgTSOBlockInfo; + +/* * TSOs live on the heap, and therefore look just like heap objects. * Large TSOs will live in their own "block group" allocated by the * 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; - StgTSOState state; /* necessary? */ + + 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; - /* Exception Handlers */ +#ifdef DEBUG + char* label; +#endif + 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: + + An active thread has the following properties: + + tso->stack < tso->sp < tso->stack+tso->stack_size + tso->stack_size <= tso->max_stack_size + + RESERVED_STACK_WORDS is large enough for any heap-check or + stack-check failure. + + The size of the TSO struct plus the stack is either + (a) smaller than a block, or + (b) a multiple of BLOCK_SIZE + + 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. + + A zombie thread has the following properties: + + 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 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) @@ -110,7 +269,7 @@ 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_))