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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.
*
* How are multiple versions of a library loaded? Examples:
*
* base - a statically-linked ghci has its own copy, so might libraries it
* dynamically loads
*
* libHSghc - a statically-linked ghc has its own copy and so will Core
* plugins it dynamically loads.
*
* ---------------------------------------------------------------------------*/
#include "PosixSource.h"
#include "Rts.h"
#include "Globals.h"
#include "Stable.h"
typedef enum {
GHCConcSignalSignalHandlerStore,
GHCConcWindowsPendingDelaysStore,
GHCConcWindowsIOManagerThreadStore,
GHCConcWindowsProddingStore,
SystemEventThreadEventManagerStore,
SystemEventThreadIOManagerThreadStore,
SystemTimerThreadEventManagerStore,
SystemTimerThreadIOManagerThreadStore,
LibHSghcFastStringTable,
LibHSghcPersistentLinkerState,
LibHSghcInitLinkerDone,
LibHSghcGlobalDynFlags,
LibHSghcStaticOptions,
LibHSghcStaticOptionsReady,
MaxStoreKey
} StoreKey;
#ifdef THREADED_RTS
Mutex globalStoreLock;
#endif
static StgStablePtr store[MaxStoreKey];
void
initGlobalStore(void)
{
uint32_t i;
for (i=0; i < MaxStoreKey; i++) {
store[i] = 0;
}
#ifdef THREADED_RTS
initMutex(&globalStoreLock);
#endif
}
void
exitGlobalStore(void)
{
uint32_t 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;
}
#define mkStoreAccessor(name) \
StgStablePtr \
getOrSet##name(StgStablePtr ptr) \
{ return getOrSetKey(name, ptr); }
mkStoreAccessor(GHCConcSignalSignalHandlerStore)
mkStoreAccessor(GHCConcWindowsPendingDelaysStore)
mkStoreAccessor(GHCConcWindowsIOManagerThreadStore)
mkStoreAccessor(GHCConcWindowsProddingStore)
mkStoreAccessor(SystemEventThreadEventManagerStore)
mkStoreAccessor(SystemEventThreadIOManagerThreadStore)
mkStoreAccessor(SystemTimerThreadEventManagerStore)
mkStoreAccessor(SystemTimerThreadIOManagerThreadStore)
mkStoreAccessor(LibHSghcFastStringTable)
mkStoreAccessor(LibHSghcPersistentLinkerState)
mkStoreAccessor(LibHSghcInitLinkerDone)
mkStoreAccessor(LibHSghcGlobalDynFlags)
mkStoreAccessor(LibHSghcStaticOptions)
mkStoreAccessor(LibHSghcStaticOptionsReady)
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