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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <sys/time.h>
#include <time.h>
#include <isc/mutex.h>
#include <isc/once.h>
#include <isc/print.h>
#include <isc/strerr.h>
#include <isc/string.h>
#include <isc/util.h>
#if ISC_MUTEX_PROFILE
/*@{*/
/*% Operations on timevals; adapted from FreeBSD's sys/time.h */
#define timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
#define timevaladd(vvp, uvp) \
do { \
(vvp)->tv_sec += (uvp)->tv_sec; \
(vvp)->tv_usec += (uvp)->tv_usec; \
if ((vvp)->tv_usec >= 1000000) { \
(vvp)->tv_sec++; \
(vvp)->tv_usec -= 1000000; \
} \
} while (0)
#define timevalsub(vvp, uvp) \
do { \
(vvp)->tv_sec -= (uvp)->tv_sec; \
(vvp)->tv_usec -= (uvp)->tv_usec; \
if ((vvp)->tv_usec < 0) { \
(vvp)->tv_sec--; \
(vvp)->tv_usec += 1000000; \
} \
} while (0)
/*@}*/
#define ISC_MUTEX_MAX_LOCKERS 32
typedef struct {
const char *file;
int line;
unsigned count;
struct timeval locked_total;
struct timeval wait_total;
} isc_mutexlocker_t;
struct isc_mutexstats {
const char *file; /*%< File mutex was created in. */
int line; /*%< Line mutex was created on. */
unsigned count;
struct timeval lock_t;
struct timeval locked_total;
struct timeval wait_total;
isc_mutexlocker_t *cur_locker;
isc_mutexlocker_t lockers[ISC_MUTEX_MAX_LOCKERS];
};
#ifndef ISC_MUTEX_PROFTABLESIZE
#define ISC_MUTEX_PROFTABLESIZE (1024 * 1024)
#endif /* ifndef ISC_MUTEX_PROFTABLESIZE */
static isc_mutexstats_t stats[ISC_MUTEX_PROFTABLESIZE];
static int stats_next = 0;
static bool stats_init = false;
static pthread_mutex_t statslock = PTHREAD_MUTEX_INITIALIZER;
void
isc_mutex_init_profile(isc_mutex_t *mp, const char *file, int line) {
int i, err;
err = pthread_mutex_init(&mp->mutex, NULL);
if (err != 0) {
strerror_r(err, strbuf, sizeof(strbuf));
isc_error_fatal(file, line, "pthread_mutex_init failed: %s",
strbuf);
}
RUNTIME_CHECK(pthread_mutex_lock(&statslock) == 0);
if (!stats_init) {
stats_init = true;
}
/*
* If all statistics entries have been used, give up and trigger an
* assertion failure. There would be no other way to deal with this
* because we'd like to keep record of all locks for the purpose of
* debugging and the number of necessary locks is unpredictable.
* If this failure is triggered while debugging, named should be
* rebuilt with an increased ISC_MUTEX_PROFTABLESIZE.
*/
RUNTIME_CHECK(stats_next < ISC_MUTEX_PROFTABLESIZE);
mp->stats = &stats[stats_next++];
RUNTIME_CHECK(pthread_mutex_unlock(&statslock) == 0);
mp->stats->file = file;
mp->stats->line = line;
mp->stats->count = 0;
timevalclear(&mp->stats->locked_total);
timevalclear(&mp->stats->wait_total);
for (i = 0; i < ISC_MUTEX_MAX_LOCKERS; i++) {
mp->stats->lockers[i].file = NULL;
mp->stats->lockers[i].line = 0;
mp->stats->lockers[i].count = 0;
timevalclear(&mp->stats->lockers[i].locked_total);
timevalclear(&mp->stats->lockers[i].wait_total);
}
}
isc_result_t
isc_mutex_lock_profile(isc_mutex_t *mp, const char *file, int line) {
struct timeval prelock_t;
struct timeval postlock_t;
isc_mutexlocker_t *locker = NULL;
int i;
gettimeofday(&prelock_t, NULL);
if (pthread_mutex_lock(&mp->mutex) != 0) {
return (ISC_R_UNEXPECTED);
}
gettimeofday(&postlock_t, NULL);
mp->stats->lock_t = postlock_t;
timevalsub(&postlock_t, &prelock_t);
mp->stats->count++;
timevaladd(&mp->stats->wait_total, &postlock_t);
for (i = 0; i < ISC_MUTEX_MAX_LOCKERS; i++) {
if (mp->stats->lockers[i].file == NULL) {
locker = &mp->stats->lockers[i];
locker->file = file;
locker->line = line;
break;
} else if (mp->stats->lockers[i].file == file &&
mp->stats->lockers[i].line == line)
{
locker = &mp->stats->lockers[i];
break;
}
}
if (locker != NULL) {
locker->count++;
timevaladd(&locker->wait_total, &postlock_t);
}
mp->stats->cur_locker = locker;
return (ISC_R_SUCCESS);
}
isc_result_t
isc_mutex_unlock_profile(isc_mutex_t *mp, const char *file, int line) {
struct timeval unlock_t;
UNUSED(file);
UNUSED(line);
if (mp->stats->cur_locker != NULL) {
gettimeofday(&unlock_t, NULL);
timevalsub(&unlock_t, &mp->stats->lock_t);
timevaladd(&mp->stats->locked_total, &unlock_t);
timevaladd(&mp->stats->cur_locker->locked_total, &unlock_t);
mp->stats->cur_locker = NULL;
}
return ((pthread_mutex_unlock((&mp->mutex)) == 0) ? ISC_R_SUCCESS
: ISC_R_UNEXPECTED);
}
void
isc_mutex_statsprofile(FILE *fp) {
isc_mutexlocker_t *locker;
int i, j;
fprintf(fp, "Mutex stats (in us)\n");
for (i = 0; i < stats_next; i++) {
fprintf(fp, "%-12s %4d: %10u %lu.%06lu %lu.%06lu %5d\n",
stats[i].file, stats[i].line, stats[i].count,
stats[i].locked_total.tv_sec,
stats[i].locked_total.tv_usec,
stats[i].wait_total.tv_sec, stats[i].wait_total.tv_usec,
i);
for (j = 0; j < ISC_MUTEX_MAX_LOCKERS; j++) {
locker = &stats[i].lockers[j];
if (locker->file == NULL) {
continue;
}
fprintf(fp,
" %-11s %4d: %10u %lu.%06lu %lu.%06lu %5d\n",
locker->file, locker->line, locker->count,
locker->locked_total.tv_sec,
locker->locked_total.tv_usec,
locker->wait_total.tv_sec,
locker->wait_total.tv_usec, i);
}
}
}
#endif /* ISC_MUTEX_PROFILE */
#if ISC_MUTEX_DEBUG && defined(PTHREAD_MUTEX_ERRORCHECK)
static bool errcheck_initialized = false;
static pthread_mutexattr_t errcheck;
static isc_once_t once_errcheck = ISC_ONCE_INIT;
static void
initialize_errcheck(void) {
RUNTIME_CHECK(pthread_mutexattr_init(&errcheck) == 0);
RUNTIME_CHECK(pthread_mutexattr_settype(&errcheck,
PTHREAD_MUTEX_ERRORCHECK) == 0);
errcheck_initialized = true;
}
void
isc_mutex_init_errcheck(isc_mutex_t *mp) {
isc_result_t result;
int err;
result = isc_once_do(&once_errcheck, initialize_errcheck);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
err = pthread_mutex_init(mp, &errcheck);
if (err != 0) {
strerror_r(err, strbuf, sizeof(strbuf));
isc_error_fatal(file, line, "pthread_mutex_init failed: %s",
strbuf);
}
}
#endif /* if ISC_MUTEX_DEBUG && defined(PTHREAD_MUTEX_ERRORCHECK) */
#if ISC_MUTEX_DEBUG && defined(__NetBSD__) && defined(PTHREAD_MUTEX_ERRORCHECK)
pthread_mutexattr_t isc__mutex_attrs = {
PTHREAD_MUTEX_ERRORCHECK, /* m_type */
0 /* m_flags, which appears to be unused. */
};
#endif /* if ISC_MUTEX_DEBUG && defined(__NetBSD__) && \
* defined(PTHREAD_MUTEX_ERRORCHECK) */
#if !(ISC_MUTEX_DEBUG && defined(PTHREAD_MUTEX_ERRORCHECK)) && \
!ISC_MUTEX_PROFILE
#ifdef HAVE_PTHREAD_MUTEX_ADAPTIVE_NP
static bool attr_initialized = false;
static pthread_mutexattr_t attr;
static isc_once_t once_attr = ISC_ONCE_INIT;
#endif /* HAVE_PTHREAD_MUTEX_ADAPTIVE_NP */
#ifdef HAVE_PTHREAD_MUTEX_ADAPTIVE_NP
static void
initialize_attr(void) {
RUNTIME_CHECK(pthread_mutexattr_init(&attr) == 0);
RUNTIME_CHECK(pthread_mutexattr_settype(
&attr, PTHREAD_MUTEX_ADAPTIVE_NP) == 0);
attr_initialized = true;
}
#endif /* HAVE_PTHREAD_MUTEX_ADAPTIVE_NP */
void
isc__mutex_init(isc_mutex_t *mp, const char *file, unsigned int line) {
int err;
#ifdef HAVE_PTHREAD_MUTEX_ADAPTIVE_NP
isc_result_t result = ISC_R_SUCCESS;
result = isc_once_do(&once_attr, initialize_attr);
RUNTIME_CHECK(result == ISC_R_SUCCESS);
err = pthread_mutex_init(mp, &attr);
#else /* HAVE_PTHREAD_MUTEX_ADAPTIVE_NP */
err = pthread_mutex_init(mp, ISC__MUTEX_ATTRS);
#endif /* HAVE_PTHREAD_MUTEX_ADAPTIVE_NP */
if (err != 0) {
char strbuf[ISC_STRERRORSIZE];
strerror_r(err, strbuf, sizeof(strbuf));
isc_error_fatal(file, line, "pthread_mutex_init failed: %s",
strbuf);
}
}
#endif /* if !(ISC_MUTEX_DEBUG && defined(PTHREAD_MUTEX_ERRORCHECK)) && \
* !ISC_MUTEX_PROFILE */
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