[project @ 2002-02-13 08:48:06 by sof]

[ghc-hetmet.git] / ghc / rts / RtsAPI.c

diff --git a/ghc/rts/RtsAPI.c b/ghc/rts/RtsAPI.c
index 96092d0..4178837 100644 (file)
--- a/ghc/rts/RtsAPI.c
+++ b/ghc/rts/RtsAPI.c
@@ -1,5 +1,5 @@
 /* ----------------------------------------------------------------------------
- * $Id: RtsAPI.c,v 1.31 2002/01/22 13:54:22 simonmar Exp $
+ * $Id: RtsAPI.c,v 1.32 2002/02/13 08:48:06 sof Exp $
  *
  * (c) The GHC Team, 1998-2001
  *
@@ -15,6 +15,60 @@
 #include "RtsFlags.h"
 #include "RtsUtils.h"
 #include "Prelude.h"
+#include "OSThreads.h"
+#include "Schedule.h"
+
+#if defined(THREADED_RTS)
+#define SCHEDULE_MAIN_THREAD(tso) scheduleThread_(tso,rtsFalse)
+#define WAIT_MAIN_THREAD(tso,ret) waitThread_(tso,ret,rtsFalse)
+#else
+#define SCHEDULE_MAIN_THREAD(tso) scheduleThread(tso)
+#define WAIT_MAIN_THREAD(tso,ret) waitThread(tso,ret)
+#endif
+
+#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.
@@ -22,7 +76,7 @@
 HaskellObj
 rts_mkChar (HsChar c)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
   SET_HDR(p, Czh_con_info, CCS_SYSTEM);
   p->payload[0]  = (StgClosure *)(StgChar)c;
   return p;
@@ -31,7 +85,7 @@ rts_mkChar (HsChar c)
 HaskellObj
 rts_mkInt (HsInt i)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
   SET_HDR(p, Izh_con_info, CCS_SYSTEM);
   p->payload[0]  = (StgClosure *)(StgInt)i;
   return p;
@@ -40,7 +94,7 @@ rts_mkInt (HsInt i)
 HaskellObj
 rts_mkInt8 (HsInt8 i)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
+  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);
@@ -50,7 +104,7 @@ rts_mkInt8 (HsInt8 i)
 HaskellObj
 rts_mkInt16 (HsInt16 i)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
+  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);
@@ -60,7 +114,7 @@ rts_mkInt16 (HsInt16 i)
 HaskellObj
 rts_mkInt32 (HsInt32 i)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
+  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;
@@ -70,7 +124,7 @@ HaskellObj
 rts_mkInt64 (HsInt64 i)
 {
   long long *tmp;
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,2));
+  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;
@@ -80,7 +134,7 @@ rts_mkInt64 (HsInt64 i)
 HaskellObj
 rts_mkWord (HsWord i)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
+  StgClosure *p = (StgClosure *)alloc(CONSTR_sizeW(0,1));
   SET_HDR(p, Wzh_con_info, CCS_SYSTEM);
   p->payload[0]  = (StgClosure *)(StgWord)i;
   return p;
@@ -90,7 +144,7 @@ HaskellObj
 rts_mkWord8 (HsWord8 w)
 {
   /* see rts_mkInt* comments */
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
+  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;
@@ -100,7 +154,7 @@ HaskellObj
 rts_mkWord16 (HsWord16 w)
 {
   /* see rts_mkInt* comments */
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
+  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;
@@ -110,7 +164,7 @@ HaskellObj
 rts_mkWord32 (HsWord32 w)
 {
   /* see rts_mkInt* comments */
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
+  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;
@@ -121,7 +175,7 @@ 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 */
   SET_HDR(p, W64zh_con_info, CCS_SYSTEM);
   tmp  = (unsigned long long*)&(p->payload[0]);
@@ -132,7 +186,7 @@ rts_mkWord64 (HsWord64 w)
 HaskellObj
 rts_mkFloat (HsFloat f)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,1));
+  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;
@@ -141,7 +195,7 @@ rts_mkFloat (HsFloat f)
 HaskellObj
 rts_mkDouble (HsDouble d)
 {
-  StgClosure *p = (StgClosure *)allocate(CONSTR_sizeW(0,sizeofW(StgDouble)));
+  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;
@@ -150,7 +204,7 @@ rts_mkDouble (HsDouble d)
 HaskellObj
 rts_mkStablePtr (HsStablePtr s)
 {
-  StgClosure *p = (StgClosure *)allocate(sizeofW(StgHeader)+1);
+  StgClosure *p = (StgClosure *)alloc(sizeofW(StgHeader)+1);
   SET_HDR(p, StablePtr_con_info, CCS_SYSTEM);
   p->payload[0]  = (StgClosure *)s;
   return p;
@@ -159,7 +213,7 @@ rts_mkStablePtr (HsStablePtr s)
 HaskellObj
 rts_mkPtr (HsPtr a)
 {
-  StgClosure *p = (StgClosure *)allocate(sizeofW(StgHeader)+1);
+  StgClosure *p = (StgClosure *)alloc(sizeofW(StgHeader)+1);
   SET_HDR(p, Ptr_con_info, CCS_SYSTEM);
   p->payload[0]  = (StgClosure *)a;
   return p;
@@ -186,7 +240,7 @@ rts_mkString (char *s)
 HaskellObj
 rts_apply (HaskellObj f, HaskellObj arg)
 {
-  StgAP_UPD *ap = (StgAP_UPD *)allocate(AP_sizeW(1));
+  StgAP_UPD *ap = (StgAP_UPD *)alloc(AP_sizeW(1));
   SET_HDR(ap, &stg_AP_UPD_info, CCS_SYSTEM);
   ap->n_args = 1;
   ap->fun    = f;
@@ -400,6 +454,7 @@ rts_eval (HaskellObj p, /*out*/HaskellObj *ret)
     StgTSO *tso;
 
     tso = createGenThread(RtsFlags.GcFlags.initialStkSize, p);
+    releaseAllocLock();
     scheduleThread(tso);
     return waitThread(tso, ret);
 }
@@ -410,6 +465,7 @@ rts_eval_ (HaskellObj p, unsigned int stack_size, /*out*/HaskellObj *ret)
     StgTSO *tso;
     
     tso = createGenThread(stack_size, p);
+    releaseAllocLock();
     scheduleThread(tso);
     return waitThread(tso, ret);
 }
@@ -424,11 +480,27 @@ rts_evalIO (HaskellObj p, /*out*/HaskellObj *ret)
     StgTSO* tso; 
     
     tso = createStrictIOThread(RtsFlags.GcFlags.initialStkSize, p);
+    releaseAllocLock();
     scheduleThread(tso);
     return waitThread(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();
+    SCHEDULE_MAIN_THREAD(tso);
+    return WAIT_MAIN_THREAD(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
@@ -443,6 +515,7 @@ rts_evalStableIO (HsStablePtr s, /*out*/HsStablePtr *ret)
     
     p = (StgClosure *)deRefStablePtr(s);
     tso = createStrictIOThread(RtsFlags.GcFlags.initialStkSize, p);
+    releaseAllocLock();
     scheduleThread(tso);
     stat = waitThread(tso, &r);
 
@@ -463,6 +536,7 @@ rts_evalLazyIO (HaskellObj p, unsigned int stack_size, /*out*/HaskellObj *ret)
     StgTSO *tso;
 
     tso = createIOThread(stack_size, p);
+    releaseAllocLock();
     scheduleThread(tso);
     return waitThread(tso, ret);
 }