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      1 /*	$NetBSD: tid.c,v 1.2 2025/01/26 16:25:39 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 #include <stdlib.h>
     17 #include <sys/types.h>
     18 #include <unistd.h>
     19 
     20 #include <isc/lang.h>
     21 #include <isc/thread.h>
     22 #include <isc/tid.h>
     23 #include <isc/util.h>
     24 
     25 /**
     26  * Private
     27  */
     28 thread_local uint32_t isc__tid_local = ISC_TID_UNKNOWN;
     29 
     30 /*
     31  * Zero is a better nonsense value in this case than ISC_TID_UNKNOWN;
     32  * avoids things like trying to allocate 32GB of per-thread counters.
     33  */
     34 static uint32_t tid_count = 0;
     35 
     36 /**
     37  * Protected
     38  */
     39 
     40 void
     41 isc__tid_init(uint32_t tid) {
     42 	REQUIRE(isc__tid_local == ISC_TID_UNKNOWN || isc__tid_local == tid);
     43 	isc__tid_local = tid;
     44 }
     45 
     46 void
     47 isc__tid_initcount(uint32_t count) {
     48 	REQUIRE(tid_count == 0 || tid_count == count);
     49 	tid_count = count;
     50 }
     51 
     52 /**
     53  * Public
     54  */
     55 
     56 uint32_t
     57 isc_tid_count(void) {
     58 	return tid_count;
     59 }
     60