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Code Issues Releases Wiki Activity

Make it possible to wait for a background thread to start

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This commit is contained in:
David Sansome 2010-06-02 14:22:40 +00:00
parent 24b22b1b17
commit c7d351f68a
2 changed files with 34 additions and 5 deletions
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18
src/core/backgroundthread.cpp
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@ -35,3 +35,21 @@ int BackgroundThreadBase::gettid() {
return 0;
#endif
}
void BackgroundThreadBase::Start(bool block) {
if (!block) {
// Just start the thread and return immediately
QThread::start(cpu_priority_);
return;
}
// Lock the mutex so the new thread won't try to wake us up before we start
// waiting.
QMutexLocker l(&started_wait_condition_mutex_);
// Start the thread.
QThread::start(cpu_priority_);
// Wait for the thread to initalise.
started_wait_condition_.wait(l.mutex());
}

21
src/core/backgroundthread.h
View File

@ -19,6 +19,8 @@
#include <QThread>
#include <QtDebug>
#include <QWaitCondition>
#include <QMutexLocker>
#include <boost/shared_ptr.hpp>
@ -67,7 +69,7 @@ class BackgroundThreadBase : public QThread {
void set_io_priority(IoPriority priority) { io_priority_ = priority; }
void set_cpu_priority(QThread::Priority priority) { cpu_priority_ = priority; }
virtual void Start() { QThread::start(cpu_priority_); }
virtual void Start(bool block = false);
signals:
void Initialised();
@ -85,6 +87,9 @@ class BackgroundThreadBase : public QThread {
IoPriority io_priority_;
QThread::Priority cpu_priority_;
QWaitCondition started_wait_condition_;
QMutex started_wait_condition_mutex_;
};
// This is the templated class that stores and returns the worker object.
@ -161,14 +166,20 @@ BackgroundThreadImplementation<InterfaceType, DerivedType>::
template <typename InterfaceType, typename DerivedType>
void BackgroundThreadImplementation<InterfaceType, DerivedType>::run() {
BackgroundThreadBase::SetIOPriority();
this->SetIOPriority();
BackgroundThread<InterfaceType>::worker_.reset(new DerivedType);
this->worker_.reset(new DerivedType);
emit BackgroundThreadBase::Initialised();
{
// Tell the calling thread that we've initialised the worker.
QMutexLocker l(&this->started_wait_condition_mutex_);
this->started_wait_condition_.wakeAll();
}
emit this->Initialised();
QThread::exec();
BackgroundThread<InterfaceType>::worker_.reset();
this->worker_.reset();
}