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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.
*
* ---------------------------------------------------------------------------*/
#include "Rts.h"
#include "RtsGlobals.h"
static StgStablePtr typeableStore = 0;
static StgStablePtr signalHandlerStore = 0;
#ifdef THREADED_RTS
Mutex globalStoreLock;
#endif
void
initGlobalStore(void)
{
typeableStore = 0;
signalHandlerStore = 0;
#ifdef THREADED_RTS
initMutex(&globalStoreLock);
#endif
}
void
exitGlobalStore(void)
{
#ifdef THREADED_RTS
closeMutex(&globalStoreLock);
#endif
if(typeableStore!=0) {
freeStablePtr((StgStablePtr)typeableStore);
typeableStore=0;
}
if(signalHandlerStore!=0) {
freeStablePtr((StgStablePtr)signalHandlerStore);
signalHandlerStore=0;
}
}
StgStablePtr
getOrSetTypeableStore(StgStablePtr ptr)
{
StgStablePtr ret = typeableStore;
if(ret==0) {
#ifdef THREADED_RTS
ACQUIRE_LOCK(&globalStoreLock);
ret=typeableStore;
if(ret==0) {
#endif
typeableStore = ret = ptr;
#ifdef THREADED_RTS
}
RELEASE_LOCK(&globalStoreLock);
#endif
}
return ret;
}
StgStablePtr
getOrSetSignalHandlerStore(StgStablePtr ptr)
{
StgStablePtr ret = signalHandlerStore;
if(ret==0) {
#ifdef THREADED_RTS
ACQUIRE_LOCK(&globalStoreLock);
ret=signalHandlerStore;
if(ret==0) {
#endif
signalHandlerStore = ret = ptr;
#ifdef THREADED_RTS
}
RELEASE_LOCK(&globalStoreLock);
#endif
}
return ret;
}
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