reactos/lib/drivers/sound/mmebuddy/thread.c

   1 /*
   2  * PROJECT:     ReactOS Sound System "MME Buddy" Library
   3  * LICENSE:     GPL - See COPYING in the top level directory
   4  * FILE:        lib/drivers/sound/mmebuddy/thread.c
   5  *
   6  * PURPOSE:     Multimedia thread management
   7  *
   8  * PROGRAMMERS: Andrew Greenwood (silverblade@reactos.org)
   9 */
  10
  11 #include <windows.h>
  12 #include <mmsystem.h>
  13 #include <mmddk.h>
  14 #include <ntddsnd.h>
  15 #include <mmebuddy.h>
  16
  17 DWORD WINAPI
  18 SoundThreadMain(
  19     IN  LPVOID lpParameter OPTIONAL)
  20 {
  21     PSOUND_THREAD Thread = (PSOUND_THREAD) lpParameter;
  22
  23     SND_TRACE(L"SoundThread running :)\n");
  24
  25     /* Callers will wait for us to be ready */
  26     Thread->Running = TRUE;
  27     SetEvent(Thread->Events.Ready);
  28
  29     while ( Thread->Running )
  30     {
  31         DWORD WaitResult;
  32
  33         /* Wait for a request, or an I/O completion */
  34         WaitResult = WaitForSingleObjectEx(Thread->Events.Request, INFINITE, TRUE);
  35         SND_TRACE(L"SoundThread - Came out of waiting\n");
  36
  37         if ( WaitResult == WAIT_OBJECT_0 )
  38         {
  39             SND_TRACE(L"SoundThread - Processing request\n");
  40
  41             if ( Thread->Request.Handler )
  42             {
  43                 Thread->Request.Result = Thread->Request.Handler(Thread->Request.SoundDeviceInstance,
  44                                                                  Thread->Request.Parameter);
  45             }
  46             else
  47             {
  48                 Thread->Request.Result = MMSYSERR_ERROR;
  49             }
  50
  51             /* Announce completion of the request */
  52             SetEvent(Thread->Events.Done);
  53             /* Accept new requests */
  54             SetEvent(Thread->Events.Ready);
  55         }
  56         else if ( WaitResult == WAIT_IO_COMPLETION )
  57         {
  58             SND_TRACE(L"SoundThread - Processing IO completion\n");
  59             /* TODO */
  60         }
  61         else
  62         {
  63             /* This should not happen! */
  64             SND_ASSERT(FALSE);
  65         }
  66
  67     }
  68
  69     return 0;
  70 }
  71
  72 MMRESULT
  73 CreateSoundThreadEvents(
  74     OUT HANDLE* ReadyEvent,
  75     OUT HANDLE* RequestEvent,
  76     OUT HANDLE* DoneEvent)
  77 {
  78     BOOL ok;
  79
  80     VALIDATE_MMSYS_PARAMETER( ReadyEvent );
  81     VALIDATE_MMSYS_PARAMETER( RequestEvent );
  82     VALIDATE_MMSYS_PARAMETER( DoneEvent );
  83
  84     SND_TRACE(L"Creating thread events\n");
  85
  86     /* Initialise these so we can identify them upon failure */
  87     *ReadyEvent = *RequestEvent = *DoneEvent = INVALID_HANDLE_VALUE;
  88
  89     ok = (*ReadyEvent = CreateEvent(NULL, FALSE, FALSE, NULL)) != INVALID_HANDLE_VALUE;
  90     ok &= (*RequestEvent = CreateEvent(NULL, FALSE, FALSE, NULL)) != INVALID_HANDLE_VALUE;
  91     ok &= (*DoneEvent = CreateEvent(NULL, FALSE, FALSE, NULL)) != INVALID_HANDLE_VALUE;
  92
  93     /* If something went wrong, clean up */
  94     if ( ! ok )
  95     {
  96         if ( *ReadyEvent != INVALID_HANDLE_VALUE )
  97             CloseHandle(*ReadyEvent);
  98
  99         if ( *RequestEvent != INVALID_HANDLE_VALUE )
 100             CloseHandle(*RequestEvent);
 101
 102         if ( *DoneEvent != INVALID_HANDLE_VALUE )
 103             CloseHandle(*DoneEvent);
 104
 105         return MMSYSERR_NOMEM;
 106     }
 107
 108     return MMSYSERR_NOERROR;
 109 }
 110
 111 MMRESULT
 112 DestroySoundThreadEvents(
 113     IN  HANDLE ReadyEvent,
 114     IN  HANDLE RequestEvent,
 115     IN  HANDLE DoneEvent)
 116 {
 117     VALIDATE_MMSYS_PARAMETER( ReadyEvent != INVALID_HANDLE_VALUE );
 118     VALIDATE_MMSYS_PARAMETER( RequestEvent != INVALID_HANDLE_VALUE );
 119     VALIDATE_MMSYS_PARAMETER( DoneEvent != INVALID_HANDLE_VALUE );
 120
 121     SND_TRACE(L"Destroying thread events\n");
 122
 123     CloseHandle(ReadyEvent);
 124     CloseHandle(RequestEvent);
 125     CloseHandle(DoneEvent);
 126
 127     return MMSYSERR_NOERROR;
 128 }
 129
 130 MMRESULT
 131 CreateSoundThread(
 132     OUT PSOUND_THREAD* Thread)
 133 {
 134     MMRESULT Result;
 135     PSOUND_THREAD NewThread;
 136
 137     VALIDATE_MMSYS_PARAMETER( Thread );
 138
 139     NewThread = AllocateStruct(SOUND_THREAD);
 140     if ( ! NewThread )
 141         return MMSYSERR_NOMEM;
 142
 143     /* Prepare the events we'll be using to sync. everything */
 144     Result = CreateSoundThreadEvents(&NewThread->Events.Ready,
 145                                      &NewThread->Events.Request,
 146                                      &NewThread->Events.Done);
 147
 148     if ( ! MMSUCCESS(Result) )
 149     {
 150         FreeMemory(NewThread);
 151         return TranslateInternalMmResult(Result);
 152     }
 153
 154     SND_TRACE(L"Creating a sound thread\n");
 155     NewThread->Handle = CreateThread(NULL,
 156                                      0,
 157                                      &SoundThreadMain,
 158                                      (LPVOID) NewThread,
 159                                      CREATE_SUSPENDED,
 160                                      NULL);
 161
 162     /* Something went wrong, bail out! */
 163     if ( NewThread->Handle == INVALID_HANDLE_VALUE )
 164     {
 165         SND_ERR(L"Sound thread creation failed!\n");
 166         DestroySoundThreadEvents(NewThread->Events.Ready,
 167                                  NewThread->Events.Request,
 168                                  NewThread->Events.Done);
 169
 170         FreeMemory(NewThread);
 171
 172         return Win32ErrorToMmResult(GetLastError());
 173     }
 174
 175     /* Wake the thread up */
 176     if ( ResumeThread(NewThread->Handle) == -1 )
 177     {
 178         CloseHandle(NewThread->Handle);
 179         DestroySoundThreadEvents(NewThread->Events.Ready,
 180                                  NewThread->Events.Request,
 181                                  NewThread->Events.Done);
 182
 183         FreeMemory(NewThread);
 184         return Win32ErrorToMmResult(GetLastError());
 185     }
 186
 187     /* If all is well we can now give the thread to the caller */
 188     *Thread = NewThread;
 189     return MMSYSERR_NOERROR;
 190 }
 191
 192 MMRESULT
 193 DestroySoundThread(
 194     IN  PSOUND_THREAD Thread)
 195 {
 196     /* TODO: Implement me! */
 197     return MMSYSERR_NOTSUPPORTED;
 198 }
 199
 200 MMRESULT
 201 CallSoundThread(
 202     IN  PSOUND_THREAD Thread,
 203     IN  SOUND_THREAD_REQUEST_HANDLER RequestHandler,
 204     IN  PSOUND_DEVICE_INSTANCE SoundDeviceInstance OPTIONAL,
 205     IN  PVOID Parameter OPTIONAL)
 206 {
 207     VALIDATE_MMSYS_PARAMETER( Thread );
 208     VALIDATE_MMSYS_PARAMETER( RequestHandler );
 209
 210     SND_TRACE(L"Waiting for READY event\n");
 211     WaitForSingleObject(Thread->Events.Ready, INFINITE);
 212
 213     Thread->Request.Result = MMSYSERR_NOTSUPPORTED;
 214     Thread->Request.Handler = RequestHandler;
 215     Thread->Request.SoundDeviceInstance = SoundDeviceInstance;
 216     Thread->Request.Parameter = Parameter;
 217
 218     /* Notify the thread it has work to do */
 219     SND_TRACE(L"Setting REQUEST event\n");
 220     SetEvent(Thread->Events.Request);
 221
 222     /* Wait for the work to be done */
 223     SND_TRACE(L"Waiting for DONE event\n");
 224     WaitForSingleObject(Thread->Events.Done, INFINITE);
 225
 226     return Thread->Request.Result;
 227 }