X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fincludes%2FTSO.h;h=82ecacb867f065f117560e82e4922769dcecba25;hb=0372ac231bd18e993a2533f784805046876d5527;hp=1f7aa8e7d17f7403a19d32063da9672abbafb36b;hpb=53d50b9c155b7deb44267100aa58497b0eedde9f;p=ghc-hetmet.git diff --git a/ghc/includes/TSO.h b/ghc/includes/TSO.h index 1f7aa8e..82ecacb 100644 --- a/ghc/includes/TSO.h +++ b/ghc/includes/TSO.h @@ -1,5 +1,4 @@ /* ----------------------------------------------------------------------------- - * $Id: TSO.h,v 1.19 2000/12/14 15:19:47 sewardj Exp $ * * (c) The GHC Team, 1998-1999 * @@ -10,10 +9,7 @@ #ifndef TSO_H #define TSO_H -#if defined(GRAN) || defined(PAR) - -#if DEBUG // && PARANOIA_LEVEL>999 -// magic marker for TSOs; debugging only +#if DEBUG #define TSO_MAGIC 4321 #endif @@ -35,106 +31,92 @@ typedef struct { StgInt localsparks; rtsTime clock; } StgTSOStatBuf; -#endif -#if defined(PROFILING) +/* + * 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; -#else /* !PROFILING */ -typedef struct { -} StgTSOProfInfo; -#endif /* PROFILING */ -#if defined(PAR) +/* + * PAR info in a TSO + */ typedef StgTSOStatBuf StgTSOParInfo; -#else /* !PAR */ -typedef struct { -} StgTSOParInfo; -#endif /* PAR */ - -#if defined(GRAN) -typedef StgTSOStatBuf StgTSOGranInfo; -#else /* !GRAN */ -typedef struct { -} StgTSOGranInfo; -#endif /* GRAN */ - -#if defined(TICKY) -typedef struct { -} StgTSOTickyInfo; -#else /* !TICKY_TICKY */ +/* + * DIST info in a TSO + */ typedef struct { -} StgTSOTickyInfo; -#endif /* TICKY_TICKY */ - -typedef enum { - tso_state_runnable, - tso_state_stopped -} StgTSOState; + StgThreadPriority priority; + StgInt revalTid; /* ToDo: merge both into 1 word */ + StgInt revalSlot; +} StgTSODistInfo; /* - * The what_next field of a TSO indicates how the thread is to be run. + * GRAN info in a TSO */ -typedef enum { - 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; +typedef StgTSOStatBuf StgTSOGranInfo; /* - * 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 :-) - * + * There is no TICKY info in a TSO at this time. */ -typedef StgWord32 StgThreadID; /* - * This type is returned to the scheduler by a thread that has - * stopped for one reason or another. + * Thread IDs are 32 bits. */ - -typedef enum { - HeapOverflow, /* might also be StackOverflow */ - StackOverflow, - ThreadYielding, - ThreadBlocked, - ThreadFinished -} StgThreadReturnCode; +typedef StgWord32 StgThreadID; /* - * 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. + * Flags for the tso->flags field. + * + * The TSO_DIRTY flag indicates that this TSO's stack should be + * scanned during garbage collection. The link field of a TSO is + * always scanned, so we don't have to dirty a TSO just for linking + * it on a different list. + * + * TSO_DIRTY is set by + * - schedule(), just before running a thread, + * - raiseAsync(), because it modifies a thread's stack + * - resumeThread(), just before running the thread again + * and unset by the garbage collector (only). */ +#define TSO_DIRTY 1 -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 +/* + * 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; + +#if defined(mingw32_HOST_OS) +/* results from an async I/O request + its request ID. */ +typedef struct { + unsigned int reqID; + int len; + int errCode; +} StgAsyncIOResult; #endif -} StgTSOBlockReason; typedef union { StgClosure *closure; struct StgTSO_ *tso; - int fd; - unsigned int target; + StgInt fd; /* StgInt instead of int, so that it's the same size as the ptrs */ +#if defined(mingw32_HOST_OS) + StgAsyncIOResult *async_result; +#endif + StgWord target; } StgTSOBlockInfo; /* @@ -144,34 +126,51 @@ typedef union { */ /* - * ToDo: make this structure sensible on a non-32-bit arch. + * 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 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 */ - StgTSOWhatNext what_next : 16; - StgTSOBlockReason why_blocked : 16; + StgWord16 what_next; /* Values defined in Constants.h */ + StgWord16 why_blocked; /* Values defined in Constants.h */ + StgWord32 flags; StgTSOBlockInfo block_info; struct StgTSO_* blocked_exceptions; StgThreadID id; - - StgTSOTickyInfo ticky; - StgTSOProfInfo prof; - StgTSOParInfo par; - StgTSOGranInfo gran; + int saved_errno; + struct Task_* bound; // non-NULL for a bound thread + struct StgTRecHeader_ *trec; /* STM transaction record */ + +#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; - StgWord stack[0]; + StgWord stack[FLEXIBLE_ARRAY]; } StgTSO; /* ----------------------------------------------------------------------------- @@ -196,6 +195,8 @@ typedef struct StgTSO_ { BlockedOnBlackHole the BLACKHOLE_BQ the BLACKHOLE_BQ's queue BlockedOnMVar the MVAR the MVAR's queue + + BlockedOnSTM END_TSO_QUEUE STM wait queue(s) BlockedOnException the TSO TSO->blocked_exception @@ -246,8 +247,24 @@ 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_)) + +/* this is the NIL ptr for a TSO queue (e.g. runnable queue) */ +#if IN_STG_CODE +#define END_TSO_QUEUE (stg_END_TSO_QUEUE_closure) +#else +#define END_TSO_QUEUE ((StgTSO *)(void*)&stg_END_TSO_QUEUE_closure) +#endif + +#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 */