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core(tls): handle process termination / cleanup issues

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This commit is contained in:
Alexander Alekhin 2021-04-29 21:25:42 +00:00
parent 0649a2fbdb
commit d2a9ca13f1
1 changed files with 19 additions and 0 deletions
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19
modules/core/src/system.cpp
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@ -1800,12 +1800,31 @@ static TlsStorage &getTlsStorage()
#ifndef _WIN32 // pthread key destructor
static void opencv_tls_destructor(void* pData)
{
if (!g_isTlsStorageInitialized)
return; // nothing to release, so prefer to avoid creation of new global structures
getTlsStorage().releaseThread(pData);
}
#else // _WIN32
#ifdef CV_USE_FLS
static void WINAPI opencv_fls_destructor(void* pData)
{
// Empiric detection of ExitProcess call
DWORD code = STILL_ACTIVE/*259*/;
BOOL res = GetExitCodeProcess(GetCurrentProcess(), &code);
if (res && code != STILL_ACTIVE)
{
// Looks like we are in ExitProcess() call
// This is FLS specific only because their callback is called before DllMain.
// TLS doesn't have similar problem, DllMain() is called first which mark __termination properly.
// Note: this workaround conflicts with ExitProcess() steps order described in documentation, however it works:
// 3. ... called with DLL_PROCESS_DETACH
// 7. The termination status of the process changes from STILL_ACTIVE to the exit value of the process.
// (ref: https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-exitprocess)
cv::__termination = true;
}
if (!g_isTlsStorageInitialized)
return; // nothing to release, so prefer to avoid creation of new global structures
getTlsStorage().releaseThread(pData);
}
#endif // CV_USE_FLS