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mutex.c revision 1.1.1.1 
      1 /*	$NetBSD: mutex.c,v 1.1.1.1 2024/02/21 21:54:49 christos Exp $	*/
      2 
      3 /*
      4  * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
      5  *
      6  * SPDX-License-Identifier: MPL-2.0
      7  *
      8  * This Source Code Form is subject to the terms of the Mozilla Public
      9  * License, v. 2.0. If a copy of the MPL was not distributed with this
     10  * file, you can obtain one at https://mozilla.org/MPL/2.0/.
     11  *
     12  * See the COPYRIGHT file distributed with this work for additional
     13  * information regarding copyright ownership.
     14  */
     15 
     16 /*! \file */
     17 
     18 #include <errno.h>
     19 #include <stdbool.h>
     20 #include <stdio.h>
     21 #include <sys/time.h>
     22 #include <time.h>
     23 
     24 #include <isc/mutex.h>
     25 #include <isc/once.h>
     26 #include <isc/print.h>
     27 #include <isc/string.h>
     28 #include <isc/util.h>
     29 
     30 #ifdef HAVE_PTHREAD_MUTEX_ADAPTIVE_NP
     31 static bool attr_initialized = false;
     32 static pthread_mutexattr_t attr;
     33 static isc_once_t once_attr = ISC_ONCE_INIT;
     34 
     35 static void
     36 initialize_attr(void) {
     37 	RUNTIME_CHECK(pthread_mutexattr_init(&attr) == 0);
     38 	RUNTIME_CHECK(pthread_mutexattr_settype(
     39 			      &attr, PTHREAD_MUTEX_ADAPTIVE_NP) == 0);
     40 	attr_initialized = true;
     41 }
     42 #endif /* HAVE_PTHREAD_MUTEX_ADAPTIVE_NP */
     43 
     44 int
     45 isc__mutex_init(isc_mutex_t *mp) {
     46 #ifdef HAVE_PTHREAD_MUTEX_ADAPTIVE_NP
     47 	isc_result_t result = ISC_R_SUCCESS;
     48 	result = isc_once_do(&once_attr, initialize_attr);
     49 	RUNTIME_CHECK(result == ISC_R_SUCCESS);
     50 
     51 	return (pthread_mutex_init(mp, &attr));
     52 #else  /* HAVE_PTHREAD_MUTEX_ADAPTIVE_NP */
     53 	return (pthread_mutex_init(mp, NULL));
     54 #endif /* HAVE_PTHREAD_MUTEX_ADAPTIVE_NP */
     55 }
     56