/* ----------------------------------------------------------------------------
- * $Id: RtsAPI.c,v 1.38 2002/12/11 15:36:47 simonmar Exp $
+ * $Id: RtsAPI.c,v 1.39 2003/01/25 15:54:49 wolfgang Exp $
*
* (c) The GHC Team, 1998-2001
*
#include "Prelude.h"
#include "OSThreads.h"
#include "Schedule.h"
+#include "Capability.h"
#include <stdlib.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 *)alloc(CONSTR_sizeW(0,1));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(CONSTR_sizeW(0,1));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(CONSTR_sizeW(0,1));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(CONSTR_sizeW(0,1));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(CONSTR_sizeW(0,1));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(CONSTR_sizeW(0,2));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(CONSTR_sizeW(0,1));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(CONSTR_sizeW(0,1));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(CONSTR_sizeW(0,1));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(CONSTR_sizeW(0,1));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(CONSTR_sizeW(0,2));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(CONSTR_sizeW(0,1));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(CONSTR_sizeW(0,sizeofW(StgDouble)));
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(sizeofW(StgHeader)+1);
+ StgClosure *p = (StgClosure *)allocate(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 *)alloc(sizeofW(StgHeader)+1);
+ StgClosure *p = (StgClosure *)allocate(sizeofW(StgHeader)+1);
SET_HDR(p, Ptr_con_info, CCS_SYSTEM);
p->payload[0] = (StgClosure *)a;
return p;
{
StgClosure *ap;
- ap = (StgClosure *)alloc(sizeofW(StgClosure) + 2);
+ ap = (StgClosure *)allocate(sizeofW(StgClosure) + 2);
SET_HDR(ap, (StgInfoTable *)&stg_ap_2_upd_info, CCS_SYSTEM);
ap->payload[0] = f;
ap->payload[1] = arg;
StgTSO *tso;
tso = createGenThread(RtsFlags.GcFlags.initialStkSize, p);
- releaseAllocLock();
return scheduleWaitThread(tso,ret);
}
StgTSO *tso;
tso = createGenThread(stack_size, p);
- releaseAllocLock();
return scheduleWaitThread(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;
+ StgTSO* tso;
tso = createStrictIOThread(RtsFlags.GcFlags.initialStkSize, p);
- releaseAllocLock();
scheduleThread(tso);
return waitThread(tso, ret);
}
p = (StgClosure *)deRefStablePtr(s);
tso = createStrictIOThread(RtsFlags.GcFlags.initialStkSize, p);
- releaseAllocLock();
stat = scheduleWaitThread(tso,&r);
if (stat == Success) {
StgTSO *tso;
tso = createIOThread(stack_size, p);
- releaseAllocLock();
return scheduleWaitThread(tso,ret);
}
stg_exit(EXIT_FAILURE);
}
}
+
+#ifdef RTS_SUPPORTS_THREADS
+void
+rts_lock()
+{
+ Capability *cap;
+ ACQUIRE_LOCK(&sched_mutex);
+
+ // we request to get the capability immediately, in order to
+ // a) stop other threads from using allocate()
+ // b) wake the current worker thread from awaitEvent()
+ // (so that a thread started by rts_eval* will start immediately)
+ grabReturnCapability(&sched_mutex,&cap);
+
+ // now that we have the capability, we don't need it anymore
+ // (other threads will continue to run as soon as we release the sched_mutex)
+ releaseCapability(cap);
+
+ // In the RTS hasn't been entered yet,
+ // start a RTS task.
+ // If there is already a task available (waiting for the work capability),
+ // this will do nothing.
+ startSchedulerTask();
+}
+
+void
+rts_unlock()
+{
+ RELEASE_LOCK(&sched_mutex);
+}
+#endif
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