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#include "config.h"
#include "AL/alc.h"
#include "AL/al.h"
#include "AL/alext.h"
#include "alMain.h"
#include "alError.h"
#include "ringbuffer.h"
static int EventThread(void *arg)
{
ALCcontext *context = arg;
/* Clear all pending posts on the semaphore. */
while(alsem_trywait(&context->EventSem) == althrd_success)
{
}
while(1)
{
ALbitfieldSOFT enabledevts;
AsyncEvent evt;
if(ll_ringbuffer_read(context->AsyncEvents, (char*)&evt, 1) == 0)
{
alsem_wait(&context->EventSem);
continue;
}
if(!evt.EnumType)
break;
almtx_lock(&context->EventCbLock);
enabledevts = ATOMIC_LOAD(&context->EnabledEvts, almemory_order_acquire);
if(context->EventCb && (enabledevts&evt.EnumType) == evt.EnumType)
context->EventCb(evt.Type, evt.ObjectId, evt.Param, (ALsizei)strlen(evt.Message),
evt.Message, context->EventParam);
almtx_unlock(&context->EventCbLock);
}
return 0;
}
AL_API void AL_APIENTRY alEventControlSOFT(ALsizei count, const ALenum *types, ALboolean enable)
{
ALCcontext *context;
ALbitfieldSOFT enabledevts;
ALbitfieldSOFT flags = 0;
bool isrunning;
ALsizei i;
context = GetContextRef();
if(!context) return;
if(count < 0) SETERR_GOTO(context, AL_INVALID_VALUE, done, "Controlling %d events", count);
if(count == 0) goto done;
if(!types) SETERR_GOTO(context, AL_INVALID_VALUE, done, "NULL pointer");
for(i = 0;i < count;i++)
{
if(types[i] == AL_EVENT_TYPE_BUFFER_COMPLETED_SOFT)
flags |= EventType_BufferCompleted;
else if(types[i] == AL_EVENT_TYPE_SOURCE_STATE_CHANGED_SOFT)
flags |= EventType_SourceStateChange;
else if(types[i] == AL_EVENT_TYPE_ERROR_SOFT)
flags |= EventType_Error;
else if(types[i] == AL_EVENT_TYPE_PERFORMANCE_SOFT)
flags |= EventType_Performance;
else if(types[i] == AL_EVENT_TYPE_DEPRECATED_SOFT)
flags |= EventType_Deprecated;
else if(types[i] == AL_EVENT_TYPE_DISCONNECTED_SOFT)
flags |= EventType_Disconnected;
else
SETERR_GOTO(context, AL_INVALID_ENUM, done, "Invalid event type 0x%04x", types[i]);
}
almtx_lock(&context->EventThrdLock);
if(enable)
{
if(!context->AsyncEvents)
context->AsyncEvents = ll_ringbuffer_create(63, sizeof(AsyncEvent), false);
enabledevts = ATOMIC_LOAD(&context->EnabledEvts, almemory_order_relaxed);
isrunning = !!enabledevts;
while(ATOMIC_COMPARE_EXCHANGE_WEAK(&context->EnabledEvts, &enabledevts, enabledevts|flags,
almemory_order_acq_rel, almemory_order_acquire) == 0)
{
/* enabledevts is (re-)filled with the current value on failure, so
* just try again.
*/
}
if(!isrunning && flags)
althrd_create(&context->EventThread, EventThread, context);
}
else
{
enabledevts = ATOMIC_LOAD(&context->EnabledEvts, almemory_order_relaxed);
isrunning = !!enabledevts;
while(ATOMIC_COMPARE_EXCHANGE_WEAK(&context->EnabledEvts, &enabledevts, enabledevts&~flags,
almemory_order_acq_rel, almemory_order_acquire) == 0)
{
}
if(isrunning && !(enabledevts&~flags))
{
static const AsyncEvent kill_evt = { 0 };
while(ll_ringbuffer_write(context->AsyncEvents, (const char*)&kill_evt, 1) == 0)
althrd_yield();
alsem_post(&context->EventSem);
althrd_join(context->EventThread, NULL);
}
else
{
/* Wait to ensure the event handler sees the changed flags before
* returning.
*/
almtx_lock(&context->EventCbLock);
almtx_unlock(&context->EventCbLock);
}
}
almtx_unlock(&context->EventThrdLock);
done:
ALCcontext_DecRef(context);
}
AL_API void AL_APIENTRY alEventCallbackSOFT(ALEVENTPROCSOFT callback, void *userParam)
{
ALCcontext *context;
context = GetContextRef();
if(!context) return;
almtx_lock(&context->PropLock);
almtx_lock(&context->EventCbLock);
context->EventCb = callback;
context->EventParam = userParam;
almtx_unlock(&context->EventCbLock);
almtx_unlock(&context->PropLock);
ALCcontext_DecRef(context);
}
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