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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 */
#if defined(HAVE_SCHED_H)
#include <sched.h>
#endif /* if defined(HAVE_SCHED_H) */
#if defined(HAVE_CPUSET_H)
#include <sys/cpuset.h>
#include <sys/param.h>
#endif /* if defined(HAVE_CPUSET_H) */
#if defined(HAVE_SYS_PROCSET_H)
#include <sys/processor.h>
#include <sys/procset.h>
#include <sys/types.h>
#endif /* if defined(HAVE_SYS_PROCSET_H) */
#include <stdlib.h>
#include <isc/atomic.h>
#include <isc/iterated_hash.h>
#include <isc/strerr.h>
#include <isc/thread.h>
#include <isc/tid.h>
#include <isc/urcu.h>
#include <isc/util.h>
#ifndef THREAD_MINSTACKSIZE
#define THREAD_MINSTACKSIZE (1024U * 1024)
#endif /* ifndef THREAD_MINSTACKSIZE */
/*
* We can't use isc_mem API here, because it's called too early and the
* isc_mem_debugging flags can be changed later causing mismatch between flags
* used for isc_mem_get() and isc_mem_put().
*/
struct thread_wrap {
struct rcu_head rcu_head;
isc_threadfunc_t func;
void *arg;
};
static struct thread_wrap *
thread_wrap(isc_threadfunc_t func, void *arg) {
struct thread_wrap *wrap = malloc(sizeof(*wrap));
RUNTIME_CHECK(wrap != NULL);
*wrap = (struct thread_wrap){
.func = func,
.arg = arg,
};
return wrap;
}
static void *
thread_body(struct thread_wrap *wrap) {
isc_threadfunc_t func = wrap->func;
void *arg = wrap->arg;
void *ret = NULL;
/*
* Every thread starts with a malloc() call to prevent memory bloat
* caused by a jemalloc quirk. We use CMM_ACCESS_ONCE() To stop an
* optimizing compiler from stripping out free(malloc(1)).
*/
void *jemalloc_enforce_init = NULL;
CMM_ACCESS_ONCE(jemalloc_enforce_init) = malloc(1);
free(jemalloc_enforce_init);
free(wrap);
ret = func(arg);
return ret;
}
static void *
thread_run(void *wrap) {
/*
* Get a thread-local digest context only in new threads.
* The main thread is handled by isc__initialize().
*/
isc__iterated_hash_initialize();
rcu_register_thread();
void *ret = thread_body(wrap);
isc__iterated_hash_shutdown();
rcu_unregister_thread();
return ret;
}
void
isc_thread_main(isc_threadfunc_t func, void *arg) {
/*
* Either this thread has not yet been started, so it can become the
* main thread, or it has already been annointed as the chosen zero
*/
REQUIRE(isc_tid() == ISC_TID_UNKNOWN || isc_tid() == 0);
thread_body(thread_wrap(func, arg));
}
void
isc_thread_create(isc_threadfunc_t func, void *arg, isc_thread_t *thread) {
int ret;
pthread_attr_t attr;
pthread_attr_init(&attr);
#if defined(HAVE_PTHREAD_ATTR_GETSTACKSIZE) && \
defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE)
size_t stacksize;
ret = pthread_attr_getstacksize(&attr, &stacksize);
PTHREADS_RUNTIME_CHECK(pthread_attr_getstacksize, ret);
if (stacksize < THREAD_MINSTACKSIZE) {
ret = pthread_attr_setstacksize(&attr, THREAD_MINSTACKSIZE);
PTHREADS_RUNTIME_CHECK(pthread_attr_setstacksize, ret);
}
#endif /* if defined(HAVE_PTHREAD_ATTR_GETSTACKSIZE) && \
* defined(HAVE_PTHREAD_ATTR_SETSTACKSIZE) */
ret = pthread_create(thread, &attr, thread_run, thread_wrap(func, arg));
PTHREADS_RUNTIME_CHECK(pthread_create, ret);
pthread_attr_destroy(&attr);
}
void
isc_thread_join(isc_thread_t thread, void **resultp) {
int ret = pthread_join(thread, resultp);
PTHREADS_RUNTIME_CHECK(pthread_join, ret);
}
void
isc_thread_setname(isc_thread_t thread, const char *name) {
#if defined(HAVE_PTHREAD_SETNAME_NP) && !defined(__APPLE__)
/*
* macOS has pthread_setname_np but only works on the
* current thread so it's not used here
*/
#if defined(__NetBSD__)
(void)pthread_setname_np(thread, name, NULL);
#else /* if defined(__NetBSD__) */
(void)pthread_setname_np(thread, name);
#endif /* if defined(__NetBSD__) */
#elif defined(HAVE_PTHREAD_SET_NAME_NP)
(void)pthread_set_name_np(thread, name);
#else /* if defined(HAVE_PTHREAD_SETNAME_NP) && !defined(__APPLE__) */
UNUSED(thread);
UNUSED(name);
#endif /* if defined(HAVE_PTHREAD_SETNAME_NP) && !defined(__APPLE__) */
}
void
isc_thread_yield(void) {
#if defined(HAVE_SCHED_YIELD)
sched_yield();
#elif defined(HAVE_PTHREAD_YIELD)
pthread_yield();
#elif defined(HAVE_PTHREAD_YIELD_NP)
pthread_yield_np();
#endif /* if defined(HAVE_SCHED_YIELD) */
}
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