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cuberite-2a/src/OSSupport/IsThread.cpp

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// IsThread.cpp
// Implements the cIsThread class representing an OS-independent wrapper for a class that implements a thread.
// This class will eventually suupersede the old cThread class
#include "Globals.h"
#include "IsThread.h"
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#if defined(_MSC_VER) && defined(_DEBUG)
// Code adapted from MSDN: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx
const DWORD MS_VC_EXCEPTION = 0x406D1388;
#pragma pack(push, 8)
struct THREADNAME_INFO
{
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DWORD dwType; // Must be 0x1000.
LPCSTR szName; // Pointer to name (in user addr space).
DWORD dwThreadID; // Thread ID (-1 = caller thread).
DWORD dwFlags; // Reserved for future use, must be zero.
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};
#pragma pack(pop)
/** Sets the name of a thread with the specified ID
(When in MSVC, the debugger provides "thread naming" by catching special exceptions)
*/
static void SetThreadName(std::thread * a_Thread, const char * a_ThreadName)
{
THREADNAME_INFO info { 0x1000, a_ThreadName, GetThreadId(a_Thread->native_handle()), 0 };
__try
{
RaiseException(MS_VC_EXCEPTION, 0, sizeof(info) / sizeof(ULONG_PTR), (ULONG_PTR *)&info);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
}
}
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#endif // _MSC_VER && _DEBUG
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////////////////////////////////////////////////////////////////////////////////
// cIsThread:
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cIsThread::cIsThread(const AString & a_ThreadName) :
m_ShouldTerminate(false),
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m_ThreadName(a_ThreadName)
{
}
cIsThread::~cIsThread()
{
m_ShouldTerminate = true;
Wait();
}
void cIsThread::DoExecute(void)
{
m_evtStart.Wait();
Execute();
}
bool cIsThread::Start(void)
{
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try
{
// Initialize the thread:
m_Thread = std::thread(&cIsThread::DoExecute, this);
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#if defined (_MSC_VER) && defined(_DEBUG)
if (!m_ThreadName.empty())
{
SetThreadName(&m_Thread, m_ThreadName.c_str());
}
#endif
// Notify the thread that initialization is complete and it can run its code safely:
m_evtStart.Set();
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return true;
}
catch (const std::system_error & a_Exception)
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{
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LOGERROR("cIsThread::Start error %i: could not construct thread %s; %s", a_Exception.code().value(), m_ThreadName.c_str(), a_Exception.code().message().c_str());
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return false;
}
}
void cIsThread::Stop(void)
{
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if (!m_Thread.joinable())
{
// The thread hasn't been started or has already been joined
return;
}
m_ShouldTerminate = true;
Wait();
}
bool cIsThread::Wait(void)
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{
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LOGD("Waiting for thread %s to finish", m_ThreadName.c_str());
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if (m_Thread.joinable())
{
try
{
m_Thread.join();
return true;
}
catch (std::system_error & a_Exception)
{
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LOGERROR("cIsThread::Wait error %i: could not join thread %s; %s", a_Exception.code().value(), m_ThreadName.c_str(), a_Exception.code().message().c_str());
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return false;
}
}
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LOGD("Thread %s finished", m_ThreadName.c_str());
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return true;
}