*
* On discovering that a stack or heap check has failed, we do the following:
*
- * - If the context_switch flag is set, indicating that there are more
- * threads waiting to run, we yield to the scheduler
+ * - If HpLim==0, indicating that we should context-switch, we yield
+ * to the scheduler (return ThreadYielding).
+ *
+ * Note that we must leave no slop in the heap (this is a requirement
+ * for LDV profiling, at least), so if we just had a heap-check
+ * failure, then we must retract Hp by HpAlloc. How do we know
+ * whether there was a heap-check failure? HpLim might be zero, and
+ * yet we got here as a result of a stack-check failure. Hence, we
+ * require that HpAlloc is only non-zero if there was a heap-check
+ * failure, otherwise it is zero, so we can always safely subtract
+ * HpAlloc from Hp.
+ *
+ * Hence, HpAlloc is zeroed in LOAD_THREAD_STATE().
+ *
+ * - If the context_switch flag is set (the backup plan if setting HpLim
+ * to 0 didn't trigger a context switch), we yield to the scheduler
* (return ThreadYielding).
*
* - If Hp > HpLim, we've had a heap check failure. This means we've
DEBUG_ONLY(foreign "C" heapCheckFail()); \
if (Hp > HpLim) { \
Hp = Hp - HpAlloc/*in bytes*/; \
+ if (HpLim == 0) { \
+ R1 = ThreadYielding; \
+ goto sched; \
+ } \
if (HpAlloc <= BLOCK_SIZE \
&& bdescr_link(CurrentNursery) != NULL) { \
+ HpAlloc = 0; \
CLOSE_NURSERY(); \
CurrentNursery = bdescr_link(CurrentNursery); \
OPEN_NURSERY(); \
GC_GENERIC
}
-#if defined(GRAN)
-/*
- ToDo: merge the block and yield macros, calling something like BLOCK(N)
- at the end;
-*/
-
-/*
- Should we actually ever do a yield in such a case?? -- HWL
-*/
-gran_yield_0
-{
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadYielding;
- jump StgReturn;
-}
-
-gran_yield_1
-{
- Sp_adj(-1);
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadYielding;
- jump StgReturn;
-}
-
-/*- 2 Regs--------------------------------------------------------------------*/
-
-gran_yield_2
-{
- Sp_adj(-2);
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadYielding;
- jump StgReturn;
-}
-
-/*- 3 Regs -------------------------------------------------------------------*/
-
-gran_yield_3
-{
- Sp_adj(-3);
- Sp(2) = R3;
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadYielding;
- jump StgReturn;
-}
-
-/*- 4 Regs -------------------------------------------------------------------*/
-
-gran_yield_4
-{
- Sp_adj(-4);
- Sp(3) = R4;
- Sp(2) = R3;
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadYielding;
- jump StgReturn;
-}
-
-/*- 5 Regs -------------------------------------------------------------------*/
-
-gran_yield_5
-{
- Sp_adj(-5);
- Sp(4) = R5;
- Sp(3) = R4;
- Sp(2) = R3;
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadYielding;
- jump StgReturn;
-}
-
-/*- 6 Regs -------------------------------------------------------------------*/
-
-gran_yield_6
-{
- Sp_adj(-6);
- Sp(5) = R6;
- Sp(4) = R5;
- Sp(3) = R4;
- Sp(2) = R3;
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadYielding;
- jump StgReturn;
-}
-
-/*- 7 Regs -------------------------------------------------------------------*/
-
-gran_yield_7
-{
- Sp_adj(-7);
- Sp(6) = R7;
- Sp(5) = R6;
- Sp(4) = R5;
- Sp(3) = R4;
- Sp(2) = R3;
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadYielding;
- jump StgReturn;
-}
-
-/*- 8 Regs -------------------------------------------------------------------*/
-
-gran_yield_8
-{
- Sp_adj(-8);
- Sp(7) = R8;
- Sp(6) = R7;
- Sp(5) = R6;
- Sp(4) = R5;
- Sp(3) = R4;
- Sp(2) = R3;
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadYielding;
- jump StgReturn;
-}
-
-// the same routines but with a block rather than a yield
-
-gran_block_1
-{
- Sp_adj(-1);
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadBlocked;
- jump StgReturn;
-}
-
-/*- 2 Regs--------------------------------------------------------------------*/
-
-gran_block_2
-{
- Sp_adj(-2);
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadBlocked;
- jump StgReturn;
-}
-
-/*- 3 Regs -------------------------------------------------------------------*/
-
-gran_block_3
-{
- Sp_adj(-3);
- Sp(2) = R3;
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadBlocked;
- jump StgReturn;
-}
-
-/*- 4 Regs -------------------------------------------------------------------*/
-
-gran_block_4
-{
- Sp_adj(-4);
- Sp(3) = R4;
- Sp(2) = R3;
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadBlocked;
- jump StgReturn;
-}
-
-/*- 5 Regs -------------------------------------------------------------------*/
-
-gran_block_5
-{
- Sp_adj(-5);
- Sp(4) = R5;
- Sp(3) = R4;
- Sp(2) = R3;
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadBlocked;
- jump StgReturn;
-}
-
-/*- 6 Regs -------------------------------------------------------------------*/
-
-gran_block_6
-{
- Sp_adj(-6);
- Sp(5) = R6;
- Sp(4) = R5;
- Sp(3) = R4;
- Sp(2) = R3;
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadBlocked;
- jump StgReturn;
-}
-
-/*- 7 Regs -------------------------------------------------------------------*/
-
-gran_block_7
-{
- Sp_adj(-7);
- Sp(6) = R7;
- Sp(5) = R6;
- Sp(4) = R5;
- Sp(3) = R4;
- Sp(2) = R3;
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadBlocked;
- jump StgReturn;
-}
-
-/*- 8 Regs -------------------------------------------------------------------*/
-
-gran_block_8
-{
- Sp_adj(-8);
- Sp(7) = R8;
- Sp(6) = R7;
- Sp(5) = R6;
- Sp(4) = R5;
- Sp(3) = R4;
- Sp(2) = R3;
- Sp(1) = R2;
- Sp(0) = R1;
- SAVE_THREAD_STATE();
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadBlocked;
- jump StgReturn;
-}
-
-#endif
-
-#if 0 && defined(PAR)
-
-/*
- Similar to stg_block_1 (called via StgMacro BLOCK_NP) but separates the
- saving of the thread state from the actual jump via an StgReturn.
- We need this separation because we call RTS routines in blocking entry codes
- before jumping back into the RTS (see parallel/FetchMe.hc).
-*/
-
-par_block_1_no_jump
-{
- Sp_adj(-1);
- Sp(0) = R1;
- SAVE_THREAD_STATE();
-}
-
-par_jump
-{
- TSO_what_next(CurrentTSO) = ThreadRunGHC;
- R1 = ThreadBlocked;
- jump StgReturn;
-}
-
-#endif
-
/* -----------------------------------------------------------------------------
Heap checks in Primitive case alternatives
{
R1 = Sp(1);
Sp_adj(2);
- jump takeMVarzh_fast;
+ jump stg_takeMVarzh;
}
// code fragment executed just before we return to the scheduler
R2 = Sp(2);
R1 = Sp(1);
Sp_adj(3);
- jump putMVarzh_fast;
+ jump stg_putMVarzh;
}
// code fragment executed just before we return to the scheduler
R2 = Sp(2);
R1 = Sp(1);
Sp_adj(3);
- jump killThreadzh_fast;
+ jump stg_killThreadzh;
}
stg_block_throwto_finally
{
-#ifdef THREADED_RTS
- foreign "C" throwToReleaseTarget (R3 "ptr");
-#endif
+ // unlock the throwto message
+ unlockClosure(StgTSO_block_info(CurrentTSO), stg_MSG_THROWTO_info);
jump StgReturn;
}
projects / ghc-hetmet.git / blobdiff