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// @file task.cpp
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mongo/pch.h"
#include <boost/thread/condition.hpp>
#include "mongo/util/concurrency/task.h"
#include "mongo/db/repl/server.h"
#include "mongo/util/goodies.h"
#include "mongo/util/startup_test.h"
#include "mongo/util/time_support.h"
namespace mongo {
namespace task {
/*void foo() {
boost::mutex m;
boost::mutex::scoped_lock lk(m);
boost::condition cond;
cond.wait(lk);
cond.notify_one();
}*/
Task::Task()
: BackgroundJob( true /* deleteSelf */ ) {
n = 0;
repeat = 0;
}
void Task::halt() { repeat = 0; }
void Task::setUp() {}
void Task::run() {
verify( n == 0 );
setUp();
while( 1 ) {
n++;
try {
doWork();
}
catch(...) { }
sleepmillis(repeat);
if( inShutdown() )
break;
if( repeat == 0 )
break;
}
}
void Task::begin() {
go();
}
void fork(Task *t) {
t->begin();
}
void repeat(Task *t, unsigned millis) {
t->repeat = millis;
t->begin();
}
}
}
/* task::Server */
namespace mongo {
namespace task {
/* to get back a return value */
struct Ret {
Ret() : done(false),m("Ret") { }
bool done;
mongo::mutex m;
boost::condition c;
const lam *msg;
void f() {
(*msg)();
done = true;
c.notify_one();
}
};
void Server::call( const lam& msg ) {
Ret r;
r.msg = &msg;
lam f = boost::bind(&Ret::f, &r);
send(f);
{
scoped_lock lk(r.m);
while( !r.done )
r.c.wait(lk.boost());
}
}
void Server::send( lam msg ) {
{
scoped_lock lk(m);
d.push_back(msg);
wassert( d.size() < 1024 );
}
c.notify_one();
}
void Server::doWork() {
starting();
while( 1 ) {
lam f;
try {
scoped_lock lk(m);
while( d.empty() )
c.wait(lk.boost());
f = d.front();
d.pop_front();
}
catch(...) {
log() << "ERROR exception in Server:doWork?" << endl;
}
try {
f();
if( rq ) {
rq = false;
{
scoped_lock lk(m);
d.push_back(f);
}
}
}
catch(std::exception& e) {
log() << "Server::doWork task:" << name() << " exception:" << e.what() << endl;
}
catch(const char *p) {
log() << "Server::doWork task:" << name() << " unknown c exception:" <<
((p&&strlen(p)<800)?p:"?") << endl;
}
catch(...) {
log() << "Server::doWork unknown exception task:" << name() << endl;
}
}
}
static Server *s;
static void abc(int i) {
cout << "Hello " << i << endl;
s->requeue();
}
class TaskUnitTest : public mongo::StartupTest {
public:
virtual void run() {
lam f = boost::bind(abc, 3);
//f();
s = new Server("unittest");
fork(s);
s->send(f);
sleepsecs(30);
cout <<" done" << endl;
}
}; // not running. taskunittest;
}
}
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