X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fincludes%2FTSO.h;h=8592cb8062469003f925f92a5c7fe7acafa7caed;hb=8504635323bc4c2d7ade98771a4e281c2d56761c;hp=6167b3195f04b1f81a370616fe99825edadf5197;hpb=438596897ebbe25a07e1c82085cfbc5bdb00f09e;p=ghc-hetmet.git diff --git a/ghc/includes/TSO.h b/ghc/includes/TSO.h index 6167b31..8592cb8 100644 --- a/ghc/includes/TSO.h +++ b/ghc/includes/TSO.h @@ -1,5 +1,7 @@ /* ----------------------------------------------------------------------------- - * $Id: TSO.h,v 1.2 1998/12/02 13:21:43 simonm Exp $ + * $Id: TSO.h,v 1.37 2004/11/08 12:26:57 simonmar Exp $ + * + * (c) The GHC Team, 1998-1999 * * The definitions for Thread State Objects. * @@ -8,64 +10,99 @@ #ifndef TSO_H #define TSO_H -#if defined(PROFILING) +#if DEBUG +#define TSO_MAGIC 4321 +#endif + typedef struct { - CostCentreStack *CCCS; /* thread's current CCS */ -} StgTSOProfInfo; -#else /* !PROFILING */ + 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; + +/* + * GRAN: We distinguish between the various classes of threads in + * the system. + */ +typedef enum { + AdvisoryPriority, + MandatoryPriority, + RevalPriority +} StgThreadPriority; + +/* + * PROFILING info in a TSO + */ typedef struct { + CostCentreStack *CCCS; /* thread's current CCS */ } StgTSOProfInfo; -#endif /* PROFILING */ -#if defined(PAR) -typedef struct { -} StgTSOParInfo; -#else /* !PAR */ -typedef struct { -} StgTSOParInfo; -#endif /* PAR */ +/* + * PAR info in a TSO + */ +typedef StgTSOStatBuf StgTSOParInfo; -#if defined(TICKY) -typedef struct { -} StgTSOTickyInfo; -#else /* !TICKY */ +/* + * DIST info in a TSO + */ typedef struct { -} StgTSOTickyInfo; -#endif /* TICKY */ + StgThreadPriority priority; + StgInt revalTid; /* ToDo: merge both into 1 word */ + StgInt revalSlot; +} StgTSODistInfo; -typedef enum { - tso_state_runnable, - tso_state_stopped -} StgTSOState; +/* + * GRAN info in a TSO + */ +typedef StgTSOStatBuf StgTSOGranInfo; -typedef enum { - ThreadEnterGHC, - ThreadRunGHC, - ThreadEnterHugs, - ThreadKilled, - ThreadComplete -} StgTSOWhatNext; +/* + * There is no TICKY info in a TSO at this time. + */ /* - * 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 StgNat64 StgThreadID; +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 unsigned int StgThreadReturnCode; -typedef enum { - HeapOverflow, /* might also be StackOverflow */ - StackOverflow, - ThreadYielding, - ThreadBlocked, - ThreadFinished -} StgThreadReturnCode; +#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; +#if defined(mingw32_TARGET_OS) + StgAsyncIOResult* async_result; +#endif + unsigned int target; +} StgTSOBlockInfo; /* * TSOs live on the heap, and therefore look just like heap objects. @@ -73,30 +110,120 @@ typedef enum { * storage manager, and won't be copied during garbage collection. */ +/* + * 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; - 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 */ + + 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; - /* Exception Handlers */ - StgTSOTickyInfo ticky; - StgTSOProfInfo prof; - StgTSOParInfo par; - /* GranSim Info? */ + int saved_errno; + struct StgMainThread_* main; + +#ifdef TICKY_TICKY + // TICKY-specific stuff would go here. +#endif +#ifdef PROFILING + StgTSOProfInfo prof; +#endif +#ifdef PAR + StgTSOParInfo par; +#endif +#ifdef GRAN + StgTSOGranInfo gran; +#endif +#ifdef DIST + StgTSODistInfo dist; +#endif /* 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 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) @@ -106,8 +233,20 @@ extern 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_)) + +/* 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 */