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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
using namespace std;
#include <string>
#include "common/Mutex.h"
#include "common/perf_counters.h"
#include "common/ceph_context.h"
#include "common/config.h"
#include "include/utime.h"
#include "common/Clock.h"
Mutex::Mutex(const char *n, bool r, bool ld,
bool bt,
CephContext *cct) :
name(n), id(-1), recursive(r), lockdep(ld), backtrace(bt),
nlock(0), locked_by(0), cct(cct), logger(0)
{
if (cct) {
PerfCountersBuilder b(cct, string("mutex-") + name,
l_mutex_first, l_mutex_last);
b.add_time_avg(l_mutex_wait, "wait");
logger = b.create_perf_counters();
cct->get_perfcounters_collection()->add(logger);
logger->set(l_mutex_wait, 0);
}
if (recursive) {
// Mutexes of type PTHREAD_MUTEX_RECURSIVE do all the same checks as
// mutexes of type PTHREAD_MUTEX_ERRORCHECK.
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&_m,&attr);
pthread_mutexattr_destroy(&attr);
if (g_lockdep)
_register();
}
else if (lockdep) {
// If the mutex type is PTHREAD_MUTEX_ERRORCHECK, then error checking
// shall be provided. If a thread attempts to relock a mutex that it
// has already locked, an error shall be returned. If a thread
// attempts to unlock a mutex that it has not locked or a mutex which
// is unlocked, an error shall be returned.
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
pthread_mutex_init(&_m, &attr);
if (g_lockdep)
_register();
}
else {
// If the mutex type is PTHREAD_MUTEX_NORMAL, deadlock detection
// shall not be provided. Attempting to relock the mutex causes
// deadlock. If a thread attempts to unlock a mutex that it has not
// locked or a mutex which is unlocked, undefined behavior results.
pthread_mutex_init(&_m, NULL);
}
}
Mutex::~Mutex() {
assert(nlock == 0);
pthread_mutex_destroy(&_m);
if (cct && logger) {
cct->get_perfcounters_collection()->remove(logger);
delete logger;
}
}
void Mutex::Lock(bool no_lockdep) {
if (lockdep && g_lockdep && !no_lockdep) _will_lock();
if (TryLock()) {
return;
}
utime_t start;
if (logger && cct && cct->_conf->mutex_perf_counter)
start = ceph_clock_now(cct);
int r = pthread_mutex_lock(&_m);
if (logger && cct && cct->_conf->mutex_perf_counter)
logger->tinc(l_mutex_wait,
ceph_clock_now(cct) - start);
assert(r == 0);
if (lockdep && g_lockdep) _locked();
_post_lock();
}
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