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/**
* Copyright (C) 2009 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/kill_current_op.h"
#include <set>
#include "mongo/bson/util/atomic_int.h"
#include "mongo/db/client.h"
#include "mongo/db/curop.h"
#include "mongo/platform/random.h"
#include "mongo/scripting/engine.h"
#include "mongo/util/fail_point_service.h"
namespace mongo {
// Enabling the checkForInterruptFail fail point will start a game of random chance on the
// connection specified in the fail point data, generating an interrupt with a given fixed
// probability. Example invocation:
//
// {configureFailPoint: "checkForInterruptFail",
// mode: "alwaysOn",
// data: {conn: 17, chance: .01, allowNested: true}}
//
// All three data fields must be specified. In the above example, all interrupt points on
// connection 17 will generate a kill on the current operation with probability p(.01),
// including interrupt points of nested operations. If "allowNested" is false, nested
// operations are not targeted. "chance" must be a double between 0 and 1, inclusive.
MONGO_FP_DECLARE(checkForInterruptFail);
void KillCurrentOp::interruptJs( AtomicUInt *op ) {
if ( !globalScriptEngine )
return;
if ( !op ) {
globalScriptEngine->interruptAll();
}
else {
globalScriptEngine->interrupt( *op );
}
}
void KillCurrentOp::killAll() {
_globalKill = true;
interruptJs( 0 );
}
bool KillCurrentOp::kill(AtomicUInt i) {
scoped_lock l( Client::clientsMutex );
return _killImpl_inclientlock(i);
}
void KillCurrentOp::blockingKill(AtomicUInt opId) {
bool killed = false;
LOG(1) << "KillCurrentOp: starting blockingkill" << endl;
boost::scoped_ptr<scoped_lock> clientLock( new scoped_lock( Client::clientsMutex ) );
boost::unique_lock<boost::mutex> lck(_mtx);
bool foundId = _killImpl_inclientlock(opId, &killed);
if (!foundId) {
// don't wait if not found
return;
}
clientLock.reset( NULL ); // unlock client since we don't need it anymore
// block until the killed operation stops
LOG(1) << "KillCurrentOp: waiting for confirmation of kill" << endl;
while (killed == false) {
_condvar.wait(lck);
}
LOG(1) << "KillCurrentOp: kill syncing complete" << endl;
}
bool KillCurrentOp::_killImpl_inclientlock(AtomicUInt i, bool* pNotifyFlag /* = NULL */) {
bool found = false;
{
for( set< Client* >::const_iterator j = Client::clients.begin();
!found && j != Client::clients.end();
++j ) {
for( CurOp *k = ( *j )->curop(); !found && k; k = k->parent() ) {
if ( k->opNum() != i )
continue;
k->kill(pNotifyFlag);
for( CurOp *l = ( *j )->curop(); l; l = l->parent() ) {
l->kill();
}
found = true;
}
}
}
if ( found ) {
interruptJs( &i );
}
return found;
}
void KillCurrentOp::notifyAllWaiters() {
boost::unique_lock<boost::mutex> lck(_mtx);
if (!haveClient())
return;
cc().curop()->setKillWaiterFlags();
_condvar.notify_all();
}
namespace {
// Global state for checkForInterrupt fail point.
PseudoRandom checkForInterruptPRNG(static_cast<int64_t>(time(NULL)));
// Helper function for checkForInterrupt fail point. Decides whether the operation currently
// being run by the given Client meet the (probabilistic) conditions for interruption as
// specified in the fail point info.
bool opShouldFail(const Client& c, const BSONObj& failPointInfo) {
// Only target the client with the specified connection number.
if (c.getConnectionId() != failPointInfo["conn"].safeNumberLong()) {
return false;
}
// Only target nested operations if requested.
if (!failPointInfo["allowNested"].trueValue() && c.curop()->parent() != NULL) {
return false;
}
// Return true with (approx) probability p = "chance". Recall: 0 <= chance <= 1.
double next = static_cast<double>(std::abs(checkForInterruptPRNG.nextInt64()));
double upperBound =
std::numeric_limits<int64_t>::max() * failPointInfo["chance"].numberDouble();
if (next > upperBound) {
return false;
}
return true;
}
} // namespace
void KillCurrentOp::checkForInterrupt(bool heedMutex) {
Client& c = cc();
if (heedMutex && Lock::somethingWriteLocked() && c.hasWrittenSinceCheckpoint()) {
return;
}
uassert(ErrorCodes::InterruptedAtShutdown, "interrupted at shutdown", !_globalKill);
if (c.curop()->maxTimeHasExpired()) {
c.curop()->kill();
notifyAllWaiters();
uasserted(ErrorCodes::ExceededTimeLimit, "operation exceeded time limit");
}
MONGO_FAIL_POINT_BLOCK(checkForInterruptFail, scopedFailPoint) {
if (opShouldFail(c, scopedFailPoint.getData())) {
log() << "set pending kill on " << (c.curop()->parent() ? "nested" : "top-level")
<< " op " << c.curop()->opNum().get() << ", for checkForInterruptFail";
c.curop()->kill();
}
}
if (c.curop()->killPending()) {
notifyAllWaiters();
uasserted(11601, "operation was interrupted");
}
}
const char * KillCurrentOp::checkForInterruptNoAssert() {
Client& c = cc();
if (_globalKill) {
return "interrupted at shutdown";
}
if (c.curop()->maxTimeHasExpired()) {
c.curop()->kill();
return "exceeded time limit";
}
MONGO_FAIL_POINT_BLOCK(checkForInterruptFail, scopedFailPoint) {
if (opShouldFail(c, scopedFailPoint.getData())) {
log() << "set pending kill on " << (c.curop()->parent() ? "nested" : "top-level")
<< " op " << c.curop()->opNum().get() << ", for checkForInterruptFail";
c.curop()->kill();
}
}
if (c.curop()->killPending()) {
return "interrupted";
}
return "";
}
void KillCurrentOp::reset() {
_globalKill = false;
}
}
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