al/event.cpp

   1
   2 #include "config.h"
   3
   4 #include "event.h"
   5
   6 #include <algorithm>
   7 #include <atomic>
   8 #include <cstring>
   9 #include <exception>
  10 #include <memory>
  11 #include <mutex>
  12 #include <new>
  13 #include <string>
  14 #include <thread>
  15 #include <utility>
  16
  17 #include "AL/al.h"
  18 #include "AL/alc.h"
  19
  20 #include "albyte.h"
  21 #include "alc/context.h"
  22 #include "alc/effects/base.h"
  23 #include "alc/inprogext.h"
  24 #include "almalloc.h"
  25 #include "core/async_event.h"
  26 #include "core/except.h"
  27 #include "core/logging.h"
  28 #include "core/voice_change.h"
  29 #include "opthelpers.h"
  30 #include "ringbuffer.h"
  31 #include "threads.h"
  32
  33
  34 static int EventThread(ALCcontext *context)
  35 {
  36     RingBuffer *ring{context->mAsyncEvents.get()};
  37     bool quitnow{false};
  38     while(!quitnow)
  39     {
  40         auto evt_data = ring->getReadVector().first;
  41         if(evt_data.len == 0)
  42         {
  43             context->mEventSem.wait();
  44             continue;
  45         }
  46
  47         std::lock_guard<std::mutex> _{context->mEventCbLock};
  48         do {
  49             auto *evt_ptr = reinterpret_cast<AsyncEvent*>(evt_data.buf);
  50             evt_data.buf += sizeof(AsyncEvent);
  51             evt_data.len -= 1;
  52
  53             AsyncEvent evt{*evt_ptr};
  54             al::destroy_at(evt_ptr);
  55             ring->readAdvance(1);
  56
  57             quitnow = evt.EnumType == AsyncEvent::KillThread;
  58             if(quitnow) UNLIKELY break;
  59
  60             if(evt.EnumType == AsyncEvent::ReleaseEffectState)
  61             {
  62                 al::intrusive_ptr<EffectState>{evt.u.mEffectState};
  63                 continue;
  64             }
  65
  66             auto enabledevts = context->mEnabledEvts.load(std::memory_order_acquire);
  67             if(!context->mEventCb || !enabledevts.test(evt.EnumType))
  68                 continue;
  69
  70             if(evt.EnumType == AsyncEvent::SourceStateChange)
  71             {
  72                 ALuint state{};
  73                 std::string msg{"Source ID " + std::to_string(evt.u.srcstate.id)};
  74                 msg += " state has changed to ";
  75                 switch(evt.u.srcstate.state)
  76                 {
  77                 case AsyncEvent::SrcState::Reset:
  78                     msg += "AL_INITIAL";
  79                     state = AL_INITIAL;
  80                     break;
  81                 case AsyncEvent::SrcState::Stop:
  82                     msg += "AL_STOPPED";
  83                     state = AL_STOPPED;
  84                     break;
  85                 case AsyncEvent::SrcState::Play:
  86                     msg += "AL_PLAYING";
  87                     state = AL_PLAYING;
  88                     break;
  89                 case AsyncEvent::SrcState::Pause:
  90                     msg += "AL_PAUSED";
  91                     state = AL_PAUSED;
  92                     break;
  93                 }
  94                 context->mEventCb(AL_EVENT_TYPE_SOURCE_STATE_CHANGED_SOFT, evt.u.srcstate.id,
  95                     state, static_cast<ALsizei>(msg.length()), msg.c_str(), context->mEventParam);
  96             }
  97             else if(evt.EnumType == AsyncEvent::BufferCompleted)
  98             {
  99                 std::string msg{std::to_string(evt.u.bufcomp.count)};
 100                 if(evt.u.bufcomp.count == 1) msg += " buffer completed";
 101                 else msg += " buffers completed";
 102                 context->mEventCb(AL_EVENT_TYPE_BUFFER_COMPLETED_SOFT, evt.u.bufcomp.id,
 103                     evt.u.bufcomp.count, static_cast<ALsizei>(msg.length()), msg.c_str(),
 104                     context->mEventParam);
 105             }
 106             else if(evt.EnumType == AsyncEvent::Disconnected)
 107             {
 108                 context->mEventCb(AL_EVENT_TYPE_DISCONNECTED_SOFT, 0, 0,
 109                     static_cast<ALsizei>(strlen(evt.u.disconnect.msg)), evt.u.disconnect.msg,
 110                     context->mEventParam);
 111             }
 112         } while(evt_data.len != 0);
 113     }
 114     return 0;
 115 }
 116
 117 void StartEventThrd(ALCcontext *ctx)
 118 {
 119     try {
 120         ctx->mEventThread = std::thread{EventThread, ctx};
 121     }
 122     catch(std::exception& e) {
 123         ERR("Failed to start event thread: %s\n", e.what());
 124     }
 125     catch(...) {
 126         ERR("Failed to start event thread! Expect problems.\n");
 127     }
 128 }
 129
 130 void StopEventThrd(ALCcontext *ctx)
 131 {
 132     RingBuffer *ring{ctx->mAsyncEvents.get()};
 133     auto evt_data = ring->getWriteVector().first;
 134     if(evt_data.len == 0)
 135     {
 136         do {
 137             std::this_thread::yield();
 138             evt_data = ring->getWriteVector().first;
 139         } while(evt_data.len == 0);
 140     }
 141     al::construct_at(reinterpret_cast<AsyncEvent*>(evt_data.buf), AsyncEvent::KillThread);
 142     ring->writeAdvance(1);
 143
 144     ctx->mEventSem.post();
 145     if(ctx->mEventThread.joinable())
 146         ctx->mEventThread.join();
 147 }
 148
 149 AL_API void AL_APIENTRY alEventControlSOFT(ALsizei count, const ALenum *types, ALboolean enable)
 150 START_API_FUNC
 151 {
 152     ContextRef context{GetContextRef()};
 153     if(!context) UNLIKELY return;
 154
 155     if(count < 0) context->setError(AL_INVALID_VALUE, "Controlling %d events", count);
 156     if(count <= 0) return;
 157     if(!types) return context->setError(AL_INVALID_VALUE, "NULL pointer");
 158
 159     ContextBase::AsyncEventBitset flags{};
 160     const ALenum *types_end = types+count;
 161     auto bad_type = std::find_if_not(types, types_end,
 162         [&flags](ALenum type) noexcept -> bool
 163         {
 164             if(type == AL_EVENT_TYPE_BUFFER_COMPLETED_SOFT)
 165                 flags.set(AsyncEvent::BufferCompleted);
 166             else if(type == AL_EVENT_TYPE_SOURCE_STATE_CHANGED_SOFT)
 167                 flags.set(AsyncEvent::SourceStateChange);
 168             else if(type == AL_EVENT_TYPE_DISCONNECTED_SOFT)
 169                 flags.set(AsyncEvent::Disconnected);
 170             else
 171                 return false;
 172             return true;
 173         }
 174     );
 175     if(bad_type != types_end)
 176         return context->setError(AL_INVALID_ENUM, "Invalid event type 0x%04x", *bad_type);
 177
 178     if(enable)
 179     {
 180         auto enabledevts = context->mEnabledEvts.load(std::memory_order_relaxed);
 181         while(context->mEnabledEvts.compare_exchange_weak(enabledevts, enabledevts|flags,
 182             std::memory_order_acq_rel, std::memory_order_acquire) == 0)
 183         {
 184             /* enabledevts is (re-)filled with the current value on failure, so
 185              * just try again.
 186              */
 187         }
 188     }
 189     else
 190     {
 191         auto enabledevts = context->mEnabledEvts.load(std::memory_order_relaxed);
 192         while(context->mEnabledEvts.compare_exchange_weak(enabledevts, enabledevts&~flags,
 193             std::memory_order_acq_rel, std::memory_order_acquire) == 0)
 194         {
 195         }
 196         /* Wait to ensure the event handler sees the changed flags before
 197          * returning.
 198          */
 199         std::lock_guard<std::mutex> _{context->mEventCbLock};
 200     }
 201 }
 202 END_API_FUNC
 203
 204 AL_API void AL_APIENTRY alEventCallbackSOFT(ALEVENTPROCSOFT callback, void *userParam)
 205 START_API_FUNC
 206 {
 207     ContextRef context{GetContextRef()};
 208     if(!context) UNLIKELY return;
 209
 210     std::lock_guard<std::mutex> _{context->mPropLock};
 211     std::lock_guard<std::mutex> __{context->mEventCbLock};
 212     context->mEventCb = callback;
 213     context->mEventParam = userParam;
 214 }
 215 END_API_FUNC