X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Frts%2FRtsAPI.c;h=7449badd8879546b70361da973578a4133b0687e;hb=0c0a693f3bc05a7c31f53c7b27f55479c1bc0ee9;hp=a8661b7162dbe3a9d0ee000c76086cc9ce8537bb;hpb=305e5f5702b5a468300433028b261f153087f1e9;p=ghc-hetmet.git

diff --git a/ghc/rts/RtsAPI.c b/ghc/rts/RtsAPI.c
index a8661b7..7449bad 100644
--- a/ghc/rts/RtsAPI.c
+++ b/ghc/rts/RtsAPI.c
@@ -1,5 +1,5 @@
 /* ----------------------------------------------------------------------------
- * $Id: RtsAPI.c,v 1.27 2001/08/03 16:30:13 sof Exp $
+ * $Id: RtsAPI.c,v 1.36 2002/08/16 14:30:21 simonmar Exp $
  *
  * (c) The GHC Team, 1998-2001
  *
@@ -7,6 +7,7 @@
  *
  * --------------------------------------------------------------------------*/
 
+#include "PosixSource.h"
 #include "Rts.h"
 #include "Storage.h"
 #include "RtsAPI.h"
@@ -14,6 +15,52 @@
 #include "RtsFlags.h"
 #include "RtsUtils.h"
 #include "Prelude.h"
+#include "OSThreads.h"
+#include "Schedule.h"
+
+#if defined(RTS_SUPPORTS_THREADS)
+/* Cheesy locking scheme while waiting for the 
+ * RTS API to change.
+ */
+static Mutex     alloc_mutex = INIT_MUTEX_VAR;
+static Condition alloc_cond  = INIT_COND_VAR;
+#define INVALID_THREAD_ID ((OSThreadId)(-1))
+
+/* Thread currently owning the allocator */
+static OSThreadId c_id = INVALID_THREAD_ID;
+
+static StgPtr alloc(nat n)
+{
+  OSThreadId tid = osThreadId();
+  ACQUIRE_LOCK(&alloc_mutex);
+  if (tid == c_id) {
+    /* I've got the lock, just allocate() */
+    ;
+  } else if (c_id == INVALID_THREAD_ID) {
+    c_id = tid;
+  } else {
+    waitCondition(&alloc_cond, &alloc_mutex);
+    c_id = tid;
+  }
+  RELEASE_LOCK(&alloc_mutex);
+  return allocate(n);
+}
+
+static void releaseAllocLock(void)
+{
+  ACQUIRE_LOCK(&alloc_mutex);
+  /* Reset the allocator owner */
+  c_id = INVALID_THREAD_ID;
+  RELEASE_LOCK(&alloc_mutex);
+
+  /* Free up an OS thread waiting to get in */
+  signalCondition(&alloc_cond);
+}
+#else
+# define alloc(n) allocate(n)
+# define releaseAllocLock() /* nothing */
+#endif
+
 
 /* ----------------------------------------------------------------------------
    Building Haskell objects from C datatypes.
@@ -21,8 +68,8 @@
 HaskellObj
 rts_mkChar (HsChar c)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
-  p->header.info = Czh_con_info;
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
+  SET_HDR(p, Czh_con_info, CCS_SYSTEM);
   p->payload[0]  = (StgClosure *)(StgChar)c;
   return p;
 }
@@ -30,8 +77,8 @@ rts_mkChar (HsChar c)
 HaskellObj
 rts_mkInt (HsInt i)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
-  p->header.info = Izh_con_info;
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
+  SET_HDR(p, Izh_con_info, CCS_SYSTEM);
   p->payload[0]  = (StgClosure *)(StgInt)i;
   return p;
 }
@@ -39,8 +86,8 @@ rts_mkInt (HsInt i)
 HaskellObj
 rts_mkInt8 (HsInt8 i)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
-  p->header.info = I8zh_con_info;
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
+  SET_HDR(p, I8zh_con_info, CCS_SYSTEM);
   /* Make sure we mask out the bits above the lowest 8 */
   p->payload[0]  = (StgClosure *)(StgInt)((unsigned)i & 0xff);
   return p;
@@ -49,8 +96,8 @@ rts_mkInt8 (HsInt8 i)
 HaskellObj
 rts_mkInt16 (HsInt16 i)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
-  p->header.info = I16zh_con_info;
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
+  SET_HDR(p, I16zh_con_info, CCS_SYSTEM);
   /* Make sure we mask out the relevant bits */
   p->payload[0]  = (StgClosure *)(StgInt)((unsigned)i & 0xffff);
   return p;
@@ -59,9 +106,9 @@ rts_mkInt16 (HsInt16 i)
 HaskellObj
 rts_mkInt32 (HsInt32 i)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
-  p->header.info = I32zh_con_info;
-  p->payload[0]  = (StgClosure *)(StgInt)i;
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
+  SET_HDR(p, I32zh_con_info, CCS_SYSTEM);
+  p->payload[0]  = (StgClosure *)(StgInt)((unsigned)i & 0xffffffff);
   return p;
 }
 
@@ -69,8 +116,8 @@ HaskellObj
 rts_mkInt64 (HsInt64 i)
 {
   long long *tmp;
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,2));
-  p->header.info = I64zh_con_info;
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,2));
+  SET_HDR(p, I64zh_con_info, CCS_SYSTEM);
   tmp  = (long long*)&(p->payload[0]);
   *tmp = (StgInt64)i;
   return p;
@@ -79,8 +126,8 @@ rts_mkInt64 (HsInt64 i)
 HaskellObj
 rts_mkWord (HsWord i)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
-  p->header.info = Wzh_con_info;
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
+  SET_HDR(p, Wzh_con_info, CCS_SYSTEM);
   p->payload[0]  = (StgClosure *)(StgWord)i;
   return p;
 }
@@ -89,8 +136,8 @@ HaskellObj
 rts_mkWord8 (HsWord8 w)
 {
   /* see rts_mkInt* comments */
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
-  p->header.info = W8zh_con_info;
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
+  SET_HDR(p, W8zh_con_info, CCS_SYSTEM);
   p->payload[0]  = (StgClosure *)(StgWord)(w & 0xff);
   return p;
 }
@@ -99,8 +146,8 @@ HaskellObj
 rts_mkWord16 (HsWord16 w)
 {
   /* see rts_mkInt* comments */
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
-  p->header.info = W16zh_con_info;
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
+  SET_HDR(p, W16zh_con_info, CCS_SYSTEM);
   p->payload[0]  = (StgClosure *)(StgWord)(w & 0xffff);
   return p;
 }
@@ -109,9 +156,9 @@ HaskellObj
 rts_mkWord32 (HsWord32 w)
 {
   /* see rts_mkInt* comments */
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
-  p->header.info = W32zh_con_info;
-  p->payload[0]  = (StgClosure *)(StgWord)w;
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
+  SET_HDR(p, W32zh_con_info, CCS_SYSTEM);
+  p->payload[0]  = (StgClosure *)(StgWord)(w & 0xffffffff);
   return p;
 }
 
@@ -120,9 +167,9 @@ rts_mkWord64 (HsWord64 w)
 {
   unsigned long long *tmp;
 
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,2));
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,2));
   /* see mk_Int8 comment */
-  p->header.info = W64zh_con_info;
+  SET_HDR(p, W64zh_con_info, CCS_SYSTEM);
   tmp  = (unsigned long long*)&(p->payload[0]);
   *tmp = (StgWord64)w;
   return p;
@@ -131,8 +178,8 @@ rts_mkWord64 (HsWord64 w)
 HaskellObj
 rts_mkFloat (HsFloat f)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
-  p->header.info = Fzh_con_info;
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
+  SET_HDR(p, Fzh_con_info, CCS_SYSTEM);
   ASSIGN_FLT((P_)p->payload, (StgFloat)f);
   return p;
 }
@@ -140,8 +187,8 @@ rts_mkFloat (HsFloat f)
 HaskellObj
 rts_mkDouble (HsDouble d)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,sizeofW(StgDouble)));
-  p->header.info = Dzh_con_info;
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,sizeofW(StgDouble)));
+  SET_HDR(p, Dzh_con_info, CCS_SYSTEM);
   ASSIGN_DBL((P_)p->payload, (StgDouble)d);
   return p;
 }
@@ -149,8 +196,8 @@ rts_mkDouble (HsDouble d)
 HaskellObj
 rts_mkStablePtr (HsStablePtr s)
 {
-  StgClosure *p = (StgClosure *)allocate(sizeofW(StgHeader)+1);
-  p->header.info = StablePtr_con_info;
+  StgClosure *p = (StgClosure *)alloc(sizeofW(StgHeader)+1);
+  SET_HDR(p, StablePtr_con_info, CCS_SYSTEM);
   p->payload[0]  = (StgClosure *)s;
   return p;
 }
@@ -158,8 +205,8 @@ rts_mkStablePtr (HsStablePtr s)
 HaskellObj
 rts_mkPtr (HsPtr a)
 {
-  StgClosure *p = (StgClosure *)allocate(sizeofW(StgHeader)+1);
-  p->header.info = Ptr_con_info;
+  StgClosure *p = (StgClosure *)alloc(sizeofW(StgHeader)+1);
+  SET_HDR(p, Ptr_con_info, CCS_SYSTEM);
   p->payload[0]  = (StgClosure *)a;
   return p;
 }
@@ -185,12 +232,13 @@ rts_mkString (char *s)
 HaskellObj
 rts_apply (HaskellObj f, HaskellObj arg)
 {
-  StgAP_UPD *ap = (StgAP_UPD *)allocate(AP_sizeW(1));
-  SET_HDR(ap, &stg_AP_UPD_info, CCS_SYSTEM);
-  ap->n_args = 1;
-  ap->fun    = f;
-  ap->payload[0] = arg;
-  return (StgClosure *)ap;
+    StgClosure *ap;
+
+    ap = (StgClosure *)alloc(sizeofW(StgClosure) + 2);
+    SET_HDR(ap, (StgInfoTable *)&stg_ap_2_upd_info, CCS_SYSTEM);
+    ap->payload[0] = f;
+    ap->payload[1] = arg;
+    return (StgClosure *)ap;
 }
 
 /* ----------------------------------------------------------------------------
@@ -396,17 +444,21 @@ rts_getBool (HaskellObj p)
 SchedulerStatus
 rts_eval (HaskellObj p, /*out*/HaskellObj *ret)
 {
-  StgTSO *tso = createGenThread(RtsFlags.GcFlags.initialStkSize, p);
-  scheduleThread(tso);
-  return waitThread(tso, ret);
+    StgTSO *tso;
+
+    tso = createGenThread(RtsFlags.GcFlags.initialStkSize, p);
+    releaseAllocLock();
+    return scheduleWaitThread(tso,ret);
 }
 
 SchedulerStatus
 rts_eval_ (HaskellObj p, unsigned int stack_size, /*out*/HaskellObj *ret)
 {
-  StgTSO *tso = createGenThread(stack_size, p);
-  scheduleThread(tso);
-  return waitThread(tso, ret);
+    StgTSO *tso;
+    
+    tso = createGenThread(stack_size, p);
+    releaseAllocLock();
+    return scheduleWaitThread(tso,ret);
 }
 
 /*
@@ -416,9 +468,52 @@ rts_eval_ (HaskellObj p, unsigned int stack_size, /*out*/HaskellObj *ret)
 SchedulerStatus
 rts_evalIO (HaskellObj p, /*out*/HaskellObj *ret)
 {
-  StgTSO* tso = createStrictIOThread(RtsFlags.GcFlags.initialStkSize, p);
-  scheduleThread(tso);
-  return waitThread(tso, ret);
+    StgTSO* tso; 
+    
+    tso = createStrictIOThread(RtsFlags.GcFlags.initialStkSize, p);
+    releaseAllocLock();
+    return scheduleWaitThread(tso,ret);
+}
+
+/*
+ * Identical to rts_evalIO(), but won't create a new task/OS thread
+ * to evaluate the Haskell thread. Used by main() only. Hack.
+ */
+SchedulerStatus
+rts_mainEvalIO(HaskellObj p, /*out*/HaskellObj *ret)
+{
+    StgTSO* tso; 
+    
+    tso = createStrictIOThread(RtsFlags.GcFlags.initialStkSize, p);
+    releaseAllocLock();
+    scheduleThread(tso);
+    return waitThread(tso, ret);
+}
+
+/*
+ * rts_evalStableIO() is suitable for calling from Haskell.  It
+ * evaluates a value of the form (StablePtr (IO a)), forcing the
+ * action's result to WHNF before returning.  The result is returned
+ * in a StablePtr.
+ */
+SchedulerStatus
+rts_evalStableIO (HsStablePtr s, /*out*/HsStablePtr *ret)
+{
+    StgTSO* tso;
+    StgClosure *p, *r;
+    SchedulerStatus stat;
+    
+    p = (StgClosure *)deRefStablePtr(s);
+    tso = createStrictIOThread(RtsFlags.GcFlags.initialStkSize, p);
+    releaseAllocLock();
+    stat = scheduleWaitThread(tso,&r);
+
+    if (stat == Success) {
+	ASSERT(r != NULL);
+	*ret = getStablePtr((StgPtr)r);
+    }
+
+    return stat;
 }
 
 /*
@@ -427,9 +522,11 @@ rts_evalIO (HaskellObj p, /*out*/HaskellObj *ret)
 SchedulerStatus
 rts_evalLazyIO (HaskellObj p, unsigned int stack_size, /*out*/HaskellObj *ret)
 {
-  StgTSO *tso = createIOThread(stack_size, p);
-  scheduleThread(tso);
-  return waitThread(tso, ret);
+    StgTSO *tso;
+
+    tso = createIOThread(stack_size, p);
+    releaseAllocLock();
+    return scheduleWaitThread(tso,ret);
 }
 
 /* Convenience function for decoding the returned status. */
@@ -444,8 +541,6 @@ rts_checkSchedStatus ( char* site, SchedulerStatus rc )
 	barf("%s: uncaught exception",site);
     case Interrupted:
 	barf("%s: interrupted", site);
-    case Deadlock:
-	barf("%s: no threads to run:  infinite loop or deadlock?", site);
     default:
 	barf("%s: Return code (%d) not ok",(site),(rc));	
     }