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/*++
Module Name:
ParallelTask.cpp
Abstract:
Parallel task management
Environment:
User mode service.
--*/
#include "stdafx.h"
#include "ParallelTask.h"
#include "Error.h"
using std::max;
ParallelCoworker::ParallelCoworker(int i_numThreads, bool i_bindToProcessors, ParallelWorkerManager* i_manager, Callback i_callback, void* i_parameter)
: stopped(false), numThreads(i_numThreads), bindToProcessors(i_bindToProcessors), manager(i_manager), callback(i_callback), parameter(i_parameter)
{
workReady = new EventObject[numThreads];
workDone = new EventObject[numThreads];
workers = new ParallelWorker*[max(numThreads, 1)];
for (int i = 0; i < numThreads; i++) {
CreateEventObject(&workReady[i]);
PreventEventWaitersFromProceeding(&workReady[i]);
CreateEventObject(&workDone[i]);
PreventEventWaitersFromProceeding(&workDone[i]);
workers[i] = manager->createWorker();
workers[i]->configure(manager, i, numThreads);
}
CreateSingleWaiterObject(&finished);
}
ParallelCoworker::~ParallelCoworker()
{
for (int i = 0; i < numThreads; i++) {
DestroyEventObject(&workReady[i]);
DestroyEventObject(&workDone[i]);
delete workers[i];
}
delete [] workReady;
delete [] workDone;
delete [] workers;
delete task;
delete context;
}
void ParallelCoworker::start()
{
context = new WorkerContext();
context->shared = this;
context->totalThreads = numThreads;
context->bindToProcessors = bindToProcessors;
#ifdef _MSC_VER
context->useTimingBarrier = false;
#endif
task = new ParallelTask<WorkerContext>(context);
task->fork();
}
void ParallelCoworker::step()
{
manager->beginStep();
for (int i = 0; i < numThreads; i++) {
PreventEventWaitersFromProceeding(&workDone[i]);
AllowEventWaitersToProceed(&workReady[i]);
}
// if async, thread 0 will callback when all workers finish
// if sync, wait for all workers to finish
if (callback == NULL) {
for (int i = 0; i < numThreads; i++) {
WaitForEvent(&workDone[i]);
}
manager->finishStep();
}
}
void ParallelCoworker::stop()
{
stopped = true;
for (int i = 0; i < numThreads; i++) {
AllowEventWaitersToProceed(&workReady[i]);
}
if (!WaitForSingleWaiterObject(&finished)) {
WriteErrorMessage("Waiting for all threads to finish failed\n");
soft_exit(1);
}
}
void
WorkerContext::initializeThread()
{
shared->workers[threadNum]->initialize();
}
void
WorkerContext::runThread()
{
while (true) {
//fprintf(stderr, "worker task thread %d waiting to begin\n", GetCurrentThreadId());
WaitForEvent(&shared->workReady[threadNum]);
PreventEventWaitersFromProceeding(&shared->workReady[threadNum]);
if (shared->stopped) {
return;
}
//fprintf(stderr, "worker task thread %d begin\n", GetCurrentThreadId());
_int64 start = timeInMillis();
shared->workers[threadNum]->step();
//fprintf(stderr, "zip task thread %d done %lld ms\n", GetCurrentThreadId(), timeInMillis() - start);
AllowEventWaitersToProceed(&shared->workDone[threadNum]);
// if async, thread 0 will wait for everyone to finish and invoke callback
if (threadNum == 0 && shared->callback != NULL) {
for (int i = 1; i < shared->numThreads; i++) {
WaitForEvent(&shared->workDone[i]);
}
shared->manager->finishStep();
shared->callback(shared->parameter);
}
}
}
void
WorkerContext::finishThread(WorkerContext* common)
{
if (threadNum == totalThreads - 1) {
SignalSingleWaiterObject(&shared->finished);
}
}
void
ParallelWorkerManager::configure(
ParallelWorker* worker,
int threadNum,
int totalThreads)
{
worker->configure(this, threadNum, totalThreads);
}
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