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SSI263 speech: fix for data-race (todo: raise GH issue, since it resulted in a Win32 crash)

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tomcw 2015-04-12 18:17:08 +01:00
parent f114a9b8fe
commit 9ceb95372f
1 changed files with 17 additions and 17 deletions
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34
source/Mockingboard.cpp
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@ -157,8 +157,8 @@ static UINT64 g_uLastCumulativeCycles = 0;
// SSI263 vars:
static USHORT g_nSSI263Device = 0; // SSI263 device# which is generating phoneme-complete IRQ
static int g_nCurrentActivePhoneme = -1;
static bool g_bStopPhoneme = false;
static volatile int g_nCurrentActivePhoneme = -1; // Modified by threads: main & SSI263Thread
static volatile bool g_bStopPhoneme = false; // Modified by threads: main & SSI263Thread
static bool g_bVotraxPhoneme = false;
static const DWORD SAMPLE_RATE = 44100; // Use a base freq so that DirectX (or sound h/w) doesn't have to up/down-sample
@ -1000,29 +1000,31 @@ static DWORD WINAPI SSI263Thread(LPVOID lpParameter)
//-----------------------------------------------------------------------------
// Warning! Data-race! [FIXME]
// . SSI263Thread() can asynchronously set /g_nCurrentActivePhoneme/ to -1
// . I have seen it on a call to Play(0,0,0)
// . eg. could occur between [1] and [2]
// - presumably after Stop(), wait for: g_bStopPhoneme == false OR for g_nCurrentActivePhoneme == -1
// - NB. sample could finish between: if (g_nCurrentActivePhoneme >= 0) and g_bStopPhoneme = true
static void SSI263_Play(unsigned int nPhoneme)
{
#if 1
HRESULT hr;
if(g_nCurrentActivePhoneme >= 0)
{
// A write to DURPHON before previous phoneme has completed
g_bStopPhoneme = true;
hr = SSI263Voice[g_nCurrentActivePhoneme].lpDSBvoice->Stop();
int nCurrPhoneme = g_nCurrentActivePhoneme; // local copy in case SSI263Thread sets it to -1
if (nCurrPhoneme >= 0)
{
// A write to DURPHON before previous phoneme has completed
g_bStopPhoneme = true;
hr = SSI263Voice[nCurrPhoneme].lpDSBvoice->Stop();
// Busy-wait until ACK from SSI263Thread
// . required to avoid data-race
while ( g_bStopPhoneme && // wait for SSI263Thread to ACK the lpDSBVoice->Stop()
g_nCurrentActivePhoneme >= 0) // wait for SSI263Thread to get end of sample event
;
g_bStopPhoneme = false;
}
}
g_nCurrentActivePhoneme = nPhoneme;
// [1]
hr = SSI263Voice[g_nCurrentActivePhoneme].lpDSBvoice->SetCurrentPosition(0);
if(FAILED(hr))
return;
@ -1032,8 +1034,6 @@ static void SSI263_Play(unsigned int nPhoneme)
return;
SSI263Voice[g_nCurrentActivePhoneme].bActive = true;
// [2]
#else
HRESULT hr;
bool bPause;