/* ----------------------------------------------------------------------------
- * $Id: RtsAPI.c,v 1.29 2001/08/29 11:20:40 simonmar Exp $
+ * $Id: RtsAPI.c,v 1.36 2002/08/16 14:30:21 simonmar Exp $
*
* (c) The GHC Team, 1998-2001
*
#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.
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;
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;
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);
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);
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;
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;
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;
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;
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;
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;
{
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]);
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;
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;
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;
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;
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;
}
/* ----------------------------------------------------------------------------
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);
}
/*
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;
}
/*
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. */
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));
}
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