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AnvilStats: Fixed thread start race condition.

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The whole program would sometimes fail to process anything because the threads were waited-for before they were started.
This commit is contained in:
Mattes D 2014-08-27 12:29:57 +03:00
parent af47b5ece2
commit cde195c156
2 changed files with 24 additions and 10 deletions
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24
Tools/AnvilStats/Processor.cpp
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@ -28,6 +28,7 @@ cProcessor::cThread::cThread(cCallback & a_Callback, cProcessor & a_ParentProces
m_Callback(a_Callback),
m_ParentProcessor(a_ParentProcessor)
{
LOG("Created a new thread: %p", this);
super::Start();
}
@ -35,11 +36,20 @@ cProcessor::cThread::cThread(cCallback & a_Callback, cProcessor & a_ParentProces
void cProcessor::cThread::WaitForStart(void)
{
m_HasStarted.Wait();
}
void cProcessor::cThread::Execute(void)
{
LOG("Started a new thread: %d", cIsThread::GetCurrentID());
LOG("Started a new thread: %p, ID %d", this, cIsThread::GetCurrentID());
m_ParentProcessor.m_ThreadsHaveStarted.Set();
m_HasStarted.Set();
for (;;)
{
@ -52,7 +62,7 @@ void cProcessor::cThread::Execute(void)
ProcessFile(FileName);
} // for-ever
LOG("Thread %d terminated", cIsThread::GetCurrentID());
LOG("Thread %p (ID %d) terminated", this, cIsThread::GetCurrentID());
}
@ -522,20 +532,18 @@ void cProcessor::ProcessWorld(const AString & a_WorldFolder, cCallbackFactory &
#endif // _DEBUG
//*/
// Start all the threads:
for (int i = 0; i < NumThreads; i++)
{
cCallback * Callback = a_CallbackFactory.GetNewCallback();
m_Threads.push_back(new cThread(*Callback, *this));
}
// Wait for the first thread to start processing:
m_ThreadsHaveStarted.Wait();
// Wait for all threads to finish
// simply by calling each thread's destructor sequentially
// Wait for all threads to finish:
LOG("Waiting for threads to finish");
for (cThreads::iterator itr = m_Threads.begin(), end = m_Threads.end(); itr != end; ++itr)
{
(*itr)->WaitForStart();
delete *itr;
} // for itr - m_Threads[]
LOG("Processor finished");

10
Tools/AnvilStats/Processor.h
View File

@ -30,6 +30,7 @@ class cProcessor
cCallback & m_Callback;
cProcessor & m_ParentProcessor;
cEvent m_HasStarted;
// cIsThread override:
virtual void Execute(void) override;
@ -48,6 +49,9 @@ class cProcessor
public:
cThread(cCallback & a_Callback, cProcessor & a_ParentProcessor);
/** Waits until the thread starts processing the callback code. */
void WaitForStart(void);
} ;
typedef std::vector<cThread *> cThreads;
@ -65,10 +69,12 @@ protected:
AStringList m_FileQueue;
cThreads m_Threads;
cEvent m_ThreadsHaveStarted; // This is signalled by each thread to notify the parent thread that it can start waiting for those threads
/** Populates m_FileQueue with Anvil files from the specified folder. */
void PopulateFileQueue(const AString & a_WorldFolder);
/** Returns one filename from m_FileQueue, and removes the name from the queue. */
AString GetOneFileName(void);
} ;