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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/modules/interface/module.h"
#include "webrtc/modules/utility/source/process_thread_impl.h"
namespace webrtc {
ProcessThread::~ProcessThread()
{
}
ProcessThread* ProcessThread::CreateProcessThread()
{
return new ProcessThreadImpl();
}
void ProcessThread::DestroyProcessThread(ProcessThread* module)
{
delete module;
}
ProcessThreadImpl::ProcessThreadImpl()
: _timeEvent(*EventWrapper::Create()),
_critSectModules(CriticalSectionWrapper::CreateCriticalSection()),
_thread(NULL)
{
}
ProcessThreadImpl::~ProcessThreadImpl()
{
delete _critSectModules;
delete &_timeEvent;
}
int32_t ProcessThreadImpl::Start()
{
CriticalSectionScoped lock(_critSectModules);
if(_thread)
{
return -1;
}
_thread = ThreadWrapper::CreateThread(Run, this, kNormalPriority,
"ProcessThread");
unsigned int id;
int32_t retVal = _thread->Start(id);
if(retVal >= 0)
{
return 0;
}
delete _thread;
_thread = NULL;
return -1;
}
int32_t ProcessThreadImpl::Stop()
{
_critSectModules->Enter();
if(_thread)
{
_thread->SetNotAlive();
ThreadWrapper* thread = _thread;
_thread = NULL;
_timeEvent.Set();
_critSectModules->Leave();
if(thread->Stop())
{
delete thread;
} else {
return -1;
}
} else {
_critSectModules->Leave();
}
return 0;
}
int32_t ProcessThreadImpl::RegisterModule(Module* module)
{
CriticalSectionScoped lock(_critSectModules);
// Only allow module to be registered once.
for (ModuleList::iterator iter = _modules.begin();
iter != _modules.end(); ++iter) {
if(module == *iter)
{
return -1;
}
}
_modules.push_front(module);
// Wake the thread calling ProcessThreadImpl::Process() to update the
// waiting time. The waiting time for the just registered module may be
// shorter than all other registered modules.
_timeEvent.Set();
return 0;
}
int32_t ProcessThreadImpl::DeRegisterModule(const Module* module)
{
CriticalSectionScoped lock(_critSectModules);
for (ModuleList::iterator iter = _modules.begin();
iter != _modules.end(); ++iter) {
if(module == *iter)
{
_modules.erase(iter);
return 0;
}
}
return -1;
}
bool ProcessThreadImpl::Run(void* obj)
{
return static_cast<ProcessThreadImpl*>(obj)->Process();
}
bool ProcessThreadImpl::Process()
{
// Wait for the module that should be called next, but don't block thread
// longer than 100 ms.
int64_t minTimeToNext = 100;
{
CriticalSectionScoped lock(_critSectModules);
for (ModuleList::iterator iter = _modules.begin();
iter != _modules.end(); ++iter) {
int64_t timeToNext = (*iter)->TimeUntilNextProcess();
if(minTimeToNext > timeToNext)
{
minTimeToNext = timeToNext;
}
}
}
if(minTimeToNext > 0)
{
if(kEventError ==
_timeEvent.Wait(static_cast<unsigned long>(minTimeToNext)))
{
return true;
}
CriticalSectionScoped lock(_critSectModules);
if(!_thread)
{
return false;
}
}
{
CriticalSectionScoped lock(_critSectModules);
for (ModuleList::iterator iter = _modules.begin();
iter != _modules.end(); ++iter) {
int64_t timeToNext = (*iter)->TimeUntilNextProcess();
if(timeToNext < 1)
{
(*iter)->Process();
}
}
}
return true;
}
} // namespace webrtc
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