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/**
* Copyright (C) 2012 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.
*/
#pragma once
#include "mongo/util/concurrency/mutexdebugger.h"
#include "mongo/util/debug_util.h"
#include "mongo/util/goodies.h" // printStackTrace
#include "mongo/util/stacktrace.h"
namespace mongo {
namespace race {
#ifdef _WIN32
typedef unsigned threadId_t;
#else
typedef pthread_t threadId_t;
#endif
#if defined(_DEBUG)
class Block {
volatile int n;
unsigned ncalls;
const std::string file;
const unsigned line;
void fail() {
log() << "\n\n\nrace: synchronization (race condition) failure\ncurrent locks this thread (" << getThreadName() << "):" << std::endl
<< mutexDebugger.currentlyLocked();
printStackTrace();
::abort();
}
void enter() {
if( ++n != 1 ) fail();
ncalls++;
if( ncalls < 100 ) {
sleepmillis(0);
}
else {
RARELY {
sleepmillis(0);
if( ncalls < 128 * 20 ) {
OCCASIONALLY {
sleepmillis(3);
}
}
}
}
}
void leave() {
if( --n != 0 ) fail();
}
public:
Block(const std::string& f, unsigned l) : n(0), ncalls(0), file(f), line(l) { }
~Block() {
if( ncalls > 1000000 ) {
// just so we know if we are slowing things down
log() << "race::Block lots of calls " << file << ' ' << line << " n:" << ncalls;
}
}
class Within {
Block& _s;
public:
Within(Block& s) : _s(s) { _s.enter(); }
~Within() { _s.leave(); }
};
};
/* in a rwlock situation this will fail, so not appropriate for things like that. */
# define RACECHECK \
static race::Block __cp(__FILE__, __LINE__); \
race::Block::Within __ck(__cp);
#else
/* !_DEBUG */
# define RACECHECK
#endif
}
}
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