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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team, 1995-2009
*
* The RTS stores some "global" values on behalf of libraries, so that
* some libraries can ensure that certain top-level things are shared
* even when multiple versions of the library are loaded. e.g. see
* Data.Typeable and GHC.Conc.
*
* If/when we switch to a dynamically-linked GHCi, this can all go
* away, because there would be just one copy of each library.
*
* ---------------------------------------------------------------------------*/
#include "PosixSource.h"
#include "Rts.h"
#include "Globals.h"
#include "Stable.h"
typedef enum {
TypeableStore,
GHCConcSignalHandlerStore,
GHCConcPendingEventsStore,
GHCConcPendingDelaysStore,
GHCConcIOManagerThreadStore,
GHCConcProddingStore,
MaxStoreKey
} StoreKey;
#ifdef THREADED_RTS
Mutex globalStoreLock;
#endif
static StgStablePtr store[MaxStoreKey];
void
initGlobalStore(void)
{
nat i;
for (i=0; i < MaxStoreKey; i++) {
store[i] = 0;
}
#ifdef THREADED_RTS
initMutex(&globalStoreLock);
#endif
}
void
exitGlobalStore(void)
{
nat i;
#ifdef THREADED_RTS
closeMutex(&globalStoreLock);
#endif
for (i=0; i < MaxStoreKey; i++) {
if (store[i] != 0) {
freeStablePtr(store[i]);
store[i] = 0;
}
}
}
static StgStablePtr getOrSetKey(StoreKey key, StgStablePtr ptr)
{
StgStablePtr ret = store[key];
if(ret==0) {
#ifdef THREADED_RTS
ACQUIRE_LOCK(&globalStoreLock);
ret = store[key];
if(ret==0) {
#endif
store[key] = ret = ptr;
#ifdef THREADED_RTS
}
RELEASE_LOCK(&globalStoreLock);
#endif
}
return ret;
}
StgStablePtr
getOrSetTypeableStore(StgStablePtr ptr)
{
return getOrSetKey(TypeableStore,ptr);
}
StgStablePtr
getOrSetGHCConcSignalHandlerStore(StgStablePtr ptr)
{
return getOrSetKey(GHCConcSignalHandlerStore,ptr);
}
StgStablePtr
getOrSetGHCConcPendingEventsStore(StgStablePtr ptr)
{
return getOrSetKey(GHCConcPendingEventsStore,ptr);
}
StgStablePtr
getOrSetGHCConcPendingDelaysStore(StgStablePtr ptr)
{
return getOrSetKey(GHCConcPendingDelaysStore,ptr);
}
StgStablePtr
getOrSetGHCConcIOManagerThreadStore(StgStablePtr ptr)
{
return getOrSetKey(GHCConcIOManagerThreadStore,ptr);
}
StgStablePtr
getOrSetGHCConcProddingStore(StgStablePtr ptr)
{
return getOrSetKey(GHCConcProddingStore,ptr);
}
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