X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fincludes%2FTSO.h;h=87ea876792a8af73ebb0af211626794fb255bdea;hb=423d477bfecd490de1449c59325c8776f91d7aac;hp=282e9c47c3472af881e3f36795dc5232521928ef;hpb=b86f4b95cb51d69a2537217132f675afa1e9519c;p=ghc-hetmet.git diff --git a/ghc/includes/TSO.h b/ghc/includes/TSO.h index 282e9c4..87ea876 100644 --- a/ghc/includes/TSO.h +++ b/ghc/includes/TSO.h @@ -1,5 +1,5 @@ /* ----------------------------------------------------------------------------- - * $Id: TSO.h,v 1.17 2000/08/15 14:18:43 simonmar Exp $ + * $Id: TSO.h,v 1.35 2004/08/13 13:09:40 simonmar Exp $ * * (c) The GHC Team, 1998-1999 * @@ -12,8 +12,7 @@ #if defined(GRAN) || defined(PAR) -#if DEBUG // && PARANOIA_LEVEL>999 -// magic marker for TSOs; debugging only +#if DEBUG #define TSO_MAGIC 4321 #endif @@ -37,108 +36,104 @@ typedef struct { } StgTSOStatBuf; #endif -#if defined(PROFILING) +/* + * 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 + */ +#ifdef PAR typedef StgTSOStatBuf StgTSOParInfo; -#else /* !PAR */ +#else +#ifdef SUPPORTS_EMPTY_STRUCTS typedef struct { + /* empty */ } StgTSOParInfo; -#endif /* PAR */ +#endif +#endif -#if defined(GRAN) +/* + * DIST info in a TSO + */ +#ifdef DIST +typedef struct { + StgThreadPriority priority; + StgInt revalTid; /* ToDo: merge both into 1 word */ + StgInt revalSlot; +} StgTSODistInfo; +#else +#ifdef SUPPORTS_EMPTY_STRUCTS +typedef struct { + /* empty */ +} StgTSODistInfo; +#endif +#endif + +/* + * GRAN info in a TSO + */ +#ifdef GRAN typedef StgTSOStatBuf StgTSOGranInfo; -#else /* !GRAN */ +#else +#ifdef SUPPORTS_EMPTY_STRUCTS typedef struct { + /* empty */ } StgTSOGranInfo; -#endif /* GRAN */ - +#endif +#endif -#if defined(TICKY) -typedef struct { -} StgTSOTickyInfo; -#else /* !TICKY_TICKY */ +/* + * TICKY_TICKY info in a TSO + */ +#ifdef SUPPORTS_EMPTY_STRUCTS typedef struct { + /* empty */ } StgTSOTickyInfo; -#endif /* TICKY_TICKY */ - -typedef enum { - tso_state_runnable, - tso_state_stopped -} StgTSOState; +#endif /* - * The what_next field of a TSO indicates how the thread is to be run. + * Thread IDs are 32 bits. */ -typedef enum { - ThreadEnterGHC, /* enter top thunk on stack */ - ThreadRunGHC, /* return to address on top of stack */ - ThreadEnterHugs, /* 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 StgWord32 StgThreadID; /* - * 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 :-) - * + * Type returned after running a thread. Values of this type + * include HeapOverflow, StackOverflow etc. See Constants.h for the + * full list. */ -typedef StgWord32 StgThreadID; +typedef unsigned int StgThreadReturnCode; /* - * This type is returned to the scheduler by a thread that has - * stopped for one reason or another. + * We distinguish between the various classes of threads in the system. */ typedef enum { - HeapOverflow, /* might also be StackOverflow */ - StackOverflow, - ThreadYielding, - ThreadBlocked, - ThreadFinished -} StgThreadReturnCode; - -/* - * 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. - */ + AdvisoryPriority, + MandatoryPriority, + RevalPriority +} StgThreadPriority; -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 +#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 -} StgTSOBlockReason; typedef union { StgClosure *closure; struct StgTSO_ *tso; int fd; -#if defined(HAVE_SETITIMER) || defined(mingw32_TARGET_OS) - unsigned int delay; -#else - unsigned int target; +#if defined(mingw32_TARGET_OS) + StgAsyncIOResult* async_result; #endif + unsigned int target; } StgTSOBlockInfo; /* @@ -148,34 +143,48 @@ typedef union { */ /* + * 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; /* Links threads onto blocking queues */ - StgMutClosure * mut_link; /* TSO's are mutable of course! */ - struct StgTSO_* global_link; /* Links all threads together */ + 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 StgTSOBlockInfo block_info; struct StgTSO_* blocked_exceptions; StgThreadID id; + int saved_errno; + +#ifdef TICKY_TICKY + MAYBE_EMPTY_STRUCT(StgTSOTickyInfo,ticky) +#endif +#ifdef PROFILING + StgTSOProfInfo prof; +#endif - StgTSOTickyInfo ticky; - StgTSOProfInfo prof; - StgTSOParInfo par; - StgTSOGranInfo gran; + MAYBE_EMPTY_STRUCT(StgTSOParInfo,par); + MAYBE_EMPTY_STRUCT(StgTSOGranInfo,gran); + MAYBE_EMPTY_STRUCT(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; - StgWord stack[0]; + StgWord stack[FLEXIBLE_ARRAY]; } StgTSO; /* ----------------------------------------------------------------------------- @@ -250,8 +259,20 @@ 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) */ +#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 */