zfs-builds-mm/zfs-0.8.3/lib/libtpool/thread_pool.c

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2020-03-01 19:43:35 +01:00
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <assert.h>
#include "thread_pool_impl.h"
static pthread_mutex_t thread_pool_lock = PTHREAD_MUTEX_INITIALIZER;
static tpool_t *thread_pools = NULL;
static void
delete_pool(tpool_t *tpool)
{
tpool_job_t *job;
ASSERT(tpool->tp_current == 0 && tpool->tp_active == NULL);
/*
* Unlink the pool from the global list of all pools.
*/
(void) pthread_mutex_lock(&thread_pool_lock);
if (thread_pools == tpool)
thread_pools = tpool->tp_forw;
if (thread_pools == tpool)
thread_pools = NULL;
else {
tpool->tp_back->tp_forw = tpool->tp_forw;
tpool->tp_forw->tp_back = tpool->tp_back;
}
pthread_mutex_unlock(&thread_pool_lock);
/*
* There should be no pending jobs, but just in case...
*/
for (job = tpool->tp_head; job != NULL; job = tpool->tp_head) {
tpool->tp_head = job->tpj_next;
free(job);
}
(void) pthread_attr_destroy(&tpool->tp_attr);
free(tpool);
}
/*
* Worker thread is terminating.
*/
static void
worker_cleanup(void *arg)
{
tpool_t *tpool = (tpool_t *)arg;
if (--tpool->tp_current == 0 &&
(tpool->tp_flags & (TP_DESTROY | TP_ABANDON))) {
if (tpool->tp_flags & TP_ABANDON) {
pthread_mutex_unlock(&tpool->tp_mutex);
delete_pool(tpool);
return;
}
if (tpool->tp_flags & TP_DESTROY)
(void) pthread_cond_broadcast(&tpool->tp_busycv);
}
pthread_mutex_unlock(&tpool->tp_mutex);
}
static void
notify_waiters(tpool_t *tpool)
{
if (tpool->tp_head == NULL && tpool->tp_active == NULL) {
tpool->tp_flags &= ~TP_WAIT;
(void) pthread_cond_broadcast(&tpool->tp_waitcv);
}
}
/*
* Called by a worker thread on return from a tpool_dispatch()d job.
*/
static void
job_cleanup(void *arg)
{
tpool_t *tpool = (tpool_t *)arg;
pthread_t my_tid = pthread_self();
tpool_active_t *activep;
tpool_active_t **activepp;
pthread_mutex_lock(&tpool->tp_mutex);
/* CSTYLED */
for (activepp = &tpool->tp_active;; activepp = &activep->tpa_next) {
activep = *activepp;
if (activep->tpa_tid == my_tid) {
*activepp = activep->tpa_next;
break;
}
}
if (tpool->tp_flags & TP_WAIT)
notify_waiters(tpool);
}
static void *
tpool_worker(void *arg)
{
tpool_t *tpool = (tpool_t *)arg;
int elapsed;
tpool_job_t *job;
void (*func)(void *);
tpool_active_t active;
pthread_mutex_lock(&tpool->tp_mutex);
pthread_cleanup_push(worker_cleanup, tpool);
/*
* This is the worker's main loop.
* It will only be left if a timeout or an error has occurred.
*/
active.tpa_tid = pthread_self();
for (;;) {
elapsed = 0;
tpool->tp_idle++;
if (tpool->tp_flags & TP_WAIT)
notify_waiters(tpool);
while ((tpool->tp_head == NULL ||
(tpool->tp_flags & TP_SUSPEND)) &&
!(tpool->tp_flags & (TP_DESTROY | TP_ABANDON))) {
if (tpool->tp_current <= tpool->tp_minimum ||
tpool->tp_linger == 0) {
(void) pthread_cond_wait(&tpool->tp_workcv,
&tpool->tp_mutex);
} else {
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_sec += tpool->tp_linger;
if (pthread_cond_timedwait(&tpool->tp_workcv,
&tpool->tp_mutex, &ts) != 0) {
elapsed = 1;
break;
}
}
}
tpool->tp_idle--;
if (tpool->tp_flags & TP_DESTROY)
break;
if (tpool->tp_flags & TP_ABANDON) {
/* can't abandon a suspended pool */
if (tpool->tp_flags & TP_SUSPEND) {
tpool->tp_flags &= ~TP_SUSPEND;
(void) pthread_cond_broadcast(
&tpool->tp_workcv);
}
if (tpool->tp_head == NULL)
break;
}
if ((job = tpool->tp_head) != NULL &&
!(tpool->tp_flags & TP_SUSPEND)) {
elapsed = 0;
func = job->tpj_func;
arg = job->tpj_arg;
tpool->tp_head = job->tpj_next;
if (job == tpool->tp_tail)
tpool->tp_tail = NULL;
tpool->tp_njobs--;
active.tpa_next = tpool->tp_active;
tpool->tp_active = &active;
pthread_mutex_unlock(&tpool->tp_mutex);
pthread_cleanup_push(job_cleanup, tpool);
free(job);
sigset_t maskset;
(void) pthread_sigmask(SIG_SETMASK, NULL, &maskset);
/*
* Call the specified function.
*/
func(arg);
/*
* We don't know what this thread has been doing,
* so we reset its signal mask and cancellation
* state back to the values prior to calling func().
*/
(void) pthread_sigmask(SIG_SETMASK, &maskset, NULL);
(void) pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED,
NULL);
(void) pthread_setcancelstate(PTHREAD_CANCEL_ENABLE,
NULL);
pthread_cleanup_pop(1);
}
if (elapsed && tpool->tp_current > tpool->tp_minimum) {
/*
* We timed out and there is no work to be done
* and the number of workers exceeds the minimum.
* Exit now to reduce the size of the pool.
*/
break;
}
}
pthread_cleanup_pop(1);
return (arg);
}
/*
* Create a worker thread, with default signals blocked.
*/
static int
create_worker(tpool_t *tpool)
{
pthread_t thread;
sigset_t oset;
int error;
(void) pthread_sigmask(SIG_SETMASK, NULL, &oset);
error = pthread_create(&thread, &tpool->tp_attr, tpool_worker, tpool);
(void) pthread_sigmask(SIG_SETMASK, &oset, NULL);
return (error);
}
/*
* pthread_attr_clone: make a copy of a pthread_attr_t. When old_attr
* is NULL initialize the cloned attr using default values.
*/
static int
pthread_attr_clone(pthread_attr_t *attr, const pthread_attr_t *old_attr)
{
int error;
error = pthread_attr_init(attr);
if (error || (old_attr == NULL))
return (error);
#ifdef __GLIBC__
cpu_set_t cpuset;
size_t cpusetsize = sizeof (cpuset);
error = pthread_attr_getaffinity_np(old_attr, cpusetsize, &cpuset);
if (error == 0)
error = pthread_attr_setaffinity_np(attr, cpusetsize, &cpuset);
if (error)
goto error;
#endif /* __GLIBC__ */
int detachstate;
error = pthread_attr_getdetachstate(old_attr, &detachstate);
if (error == 0)
error = pthread_attr_setdetachstate(attr, detachstate);
if (error)
goto error;
size_t guardsize;
error = pthread_attr_getguardsize(old_attr, &guardsize);
if (error == 0)
error = pthread_attr_setguardsize(attr, guardsize);
if (error)
goto error;
int inheritsched;
error = pthread_attr_getinheritsched(old_attr, &inheritsched);
if (error == 0)
error = pthread_attr_setinheritsched(attr, inheritsched);
if (error)
goto error;
struct sched_param param;
error = pthread_attr_getschedparam(old_attr, &param);
if (error == 0)
error = pthread_attr_setschedparam(attr, &param);
if (error)
goto error;
int policy;
error = pthread_attr_getschedpolicy(old_attr, &policy);
if (error == 0)
error = pthread_attr_setschedpolicy(attr, policy);
if (error)
goto error;
int scope;
error = pthread_attr_getscope(old_attr, &scope);
if (error == 0)
error = pthread_attr_setscope(attr, scope);
if (error)
goto error;
void *stackaddr;
size_t stacksize;
error = pthread_attr_getstack(old_attr, &stackaddr, &stacksize);
if (error == 0)
error = pthread_attr_setstack(attr, stackaddr, stacksize);
if (error)
goto error;
return (0);
error:
pthread_attr_destroy(attr);
return (error);
}
tpool_t *
tpool_create(uint_t min_threads, uint_t max_threads, uint_t linger,
pthread_attr_t *attr)
{
tpool_t *tpool;
void *stackaddr;
size_t stacksize;
size_t minstack;
int error;
if (min_threads > max_threads || max_threads < 1) {
errno = EINVAL;
return (NULL);
}
if (attr != NULL) {
if (pthread_attr_getstack(attr, &stackaddr, &stacksize) != 0) {
errno = EINVAL;
return (NULL);
}
/*
* Allow only one thread in the pool with a specified stack.
* Require threads to have at least the minimum stack size.
*/
minstack = PTHREAD_STACK_MIN;
if (stackaddr != NULL) {
if (stacksize < minstack || max_threads != 1) {
errno = EINVAL;
return (NULL);
}
} else if (stacksize != 0 && stacksize < minstack) {
errno = EINVAL;
return (NULL);
}
}
tpool = calloc(1, sizeof (*tpool));
if (tpool == NULL) {
errno = ENOMEM;
return (NULL);
}
(void) pthread_mutex_init(&tpool->tp_mutex, NULL);
(void) pthread_cond_init(&tpool->tp_busycv, NULL);
(void) pthread_cond_init(&tpool->tp_workcv, NULL);
(void) pthread_cond_init(&tpool->tp_waitcv, NULL);
tpool->tp_minimum = min_threads;
tpool->tp_maximum = max_threads;
tpool->tp_linger = linger;
/*
* We cannot just copy the attribute pointer.
* We need to initialize a new pthread_attr_t structure
* with the values from the user-supplied pthread_attr_t.
* If the attribute pointer is NULL, we need to initialize
* the new pthread_attr_t structure with default values.
*/
error = pthread_attr_clone(&tpool->tp_attr, attr);
if (error) {
free(tpool);
errno = error;
return (NULL);
}
/* make all pool threads be detached daemon threads */
(void) pthread_attr_setdetachstate(&tpool->tp_attr,
PTHREAD_CREATE_DETACHED);
/* insert into the global list of all thread pools */
pthread_mutex_lock(&thread_pool_lock);
if (thread_pools == NULL) {
tpool->tp_forw = tpool;
tpool->tp_back = tpool;
thread_pools = tpool;
} else {
thread_pools->tp_back->tp_forw = tpool;
tpool->tp_forw = thread_pools;
tpool->tp_back = thread_pools->tp_back;
thread_pools->tp_back = tpool;
}
pthread_mutex_unlock(&thread_pool_lock);
return (tpool);
}
/*
* Dispatch a work request to the thread pool.
* If there are idle workers, awaken one.
* Else, if the maximum number of workers has
* not been reached, spawn a new worker thread.
* Else just return with the job added to the queue.
*/
int
tpool_dispatch(tpool_t *tpool, void (*func)(void *), void *arg)
{
tpool_job_t *job;
ASSERT(!(tpool->tp_flags & (TP_DESTROY | TP_ABANDON)));
if ((job = calloc(1, sizeof (*job))) == NULL)
return (-1);
job->tpj_next = NULL;
job->tpj_func = func;
job->tpj_arg = arg;
pthread_mutex_lock(&tpool->tp_mutex);
if (tpool->tp_head == NULL)
tpool->tp_head = job;
else
tpool->tp_tail->tpj_next = job;
tpool->tp_tail = job;
tpool->tp_njobs++;
if (!(tpool->tp_flags & TP_SUSPEND)) {
if (tpool->tp_idle > 0)
(void) pthread_cond_signal(&tpool->tp_workcv);
else if (tpool->tp_current < tpool->tp_maximum &&
create_worker(tpool) == 0)
tpool->tp_current++;
}
pthread_mutex_unlock(&tpool->tp_mutex);
return (0);
}
static void
tpool_cleanup(void *arg)
{
tpool_t *tpool = (tpool_t *)arg;
pthread_mutex_unlock(&tpool->tp_mutex);
}
/*
* Assumes: by the time tpool_destroy() is called no one will use this
* thread pool in any way and no one will try to dispatch entries to it.
* Calling tpool_destroy() from a job in the pool will cause deadlock.
*/
void
tpool_destroy(tpool_t *tpool)
{
tpool_active_t *activep;
ASSERT(!tpool_member(tpool));
ASSERT(!(tpool->tp_flags & (TP_DESTROY | TP_ABANDON)));
pthread_mutex_lock(&tpool->tp_mutex);
pthread_cleanup_push(tpool_cleanup, tpool);
/* mark the pool as being destroyed; wakeup idle workers */
tpool->tp_flags |= TP_DESTROY;
tpool->tp_flags &= ~TP_SUSPEND;
(void) pthread_cond_broadcast(&tpool->tp_workcv);
/* cancel all active workers */
for (activep = tpool->tp_active; activep; activep = activep->tpa_next)
(void) pthread_cancel(activep->tpa_tid);
/* wait for all active workers to finish */
while (tpool->tp_active != NULL) {
tpool->tp_flags |= TP_WAIT;
(void) pthread_cond_wait(&tpool->tp_waitcv, &tpool->tp_mutex);
}
/* the last worker to terminate will wake us up */
while (tpool->tp_current != 0)
(void) pthread_cond_wait(&tpool->tp_busycv, &tpool->tp_mutex);
pthread_cleanup_pop(1); /* pthread_mutex_unlock(&tpool->tp_mutex); */
delete_pool(tpool);
}
/*
* Like tpool_destroy(), but don't cancel workers or wait for them to finish.
* The last worker to terminate will delete the pool.
*/
void
tpool_abandon(tpool_t *tpool)
{
ASSERT(!(tpool->tp_flags & (TP_DESTROY | TP_ABANDON)));
pthread_mutex_lock(&tpool->tp_mutex);
if (tpool->tp_current == 0) {
/* no workers, just delete the pool */
pthread_mutex_unlock(&tpool->tp_mutex);
delete_pool(tpool);
} else {
/* wake up all workers, last one will delete the pool */
tpool->tp_flags |= TP_ABANDON;
tpool->tp_flags &= ~TP_SUSPEND;
(void) pthread_cond_broadcast(&tpool->tp_workcv);
pthread_mutex_unlock(&tpool->tp_mutex);
}
}
/*
* Wait for all jobs to complete.
* Calling tpool_wait() from a job in the pool will cause deadlock.
*/
void
tpool_wait(tpool_t *tpool)
{
ASSERT(!tpool_member(tpool));
ASSERT(!(tpool->tp_flags & (TP_DESTROY | TP_ABANDON)));
pthread_mutex_lock(&tpool->tp_mutex);
pthread_cleanup_push(tpool_cleanup, tpool);
while (tpool->tp_head != NULL || tpool->tp_active != NULL) {
tpool->tp_flags |= TP_WAIT;
(void) pthread_cond_wait(&tpool->tp_waitcv, &tpool->tp_mutex);
ASSERT(!(tpool->tp_flags & (TP_DESTROY | TP_ABANDON)));
}
pthread_cleanup_pop(1); /* pthread_mutex_unlock(&tpool->tp_mutex); */
}
void
tpool_suspend(tpool_t *tpool)
{
ASSERT(!(tpool->tp_flags & (TP_DESTROY | TP_ABANDON)));
pthread_mutex_lock(&tpool->tp_mutex);
tpool->tp_flags |= TP_SUSPEND;
pthread_mutex_unlock(&tpool->tp_mutex);
}
int
tpool_suspended(tpool_t *tpool)
{
int suspended;
ASSERT(!(tpool->tp_flags & (TP_DESTROY | TP_ABANDON)));
pthread_mutex_lock(&tpool->tp_mutex);
suspended = (tpool->tp_flags & TP_SUSPEND) != 0;
pthread_mutex_unlock(&tpool->tp_mutex);
return (suspended);
}
void
tpool_resume(tpool_t *tpool)
{
int excess;
ASSERT(!(tpool->tp_flags & (TP_DESTROY | TP_ABANDON)));
pthread_mutex_lock(&tpool->tp_mutex);
if (!(tpool->tp_flags & TP_SUSPEND)) {
pthread_mutex_unlock(&tpool->tp_mutex);
return;
}
tpool->tp_flags &= ~TP_SUSPEND;
(void) pthread_cond_broadcast(&tpool->tp_workcv);
excess = tpool->tp_njobs - tpool->tp_idle;
while (excess-- > 0 && tpool->tp_current < tpool->tp_maximum) {
if (create_worker(tpool) != 0)
break; /* pthread_create() failed */
tpool->tp_current++;
}
pthread_mutex_unlock(&tpool->tp_mutex);
}
int
tpool_member(tpool_t *tpool)
{
pthread_t my_tid = pthread_self();
tpool_active_t *activep;
ASSERT(!(tpool->tp_flags & (TP_DESTROY | TP_ABANDON)));
pthread_mutex_lock(&tpool->tp_mutex);
for (activep = tpool->tp_active; activep; activep = activep->tpa_next) {
if (activep->tpa_tid == my_tid) {
pthread_mutex_unlock(&tpool->tp_mutex);
return (1);
}
}
pthread_mutex_unlock(&tpool->tp_mutex);
return (0);
}
void
postfork1_child_tpool(void)
{
pthread_t my_tid = pthread_self();
tpool_t *tpool;
tpool_job_t *job;
/*
* All of the thread pool workers are gone, except possibly
* for the current thread, if it is a thread pool worker thread.
* Retain the thread pools, but make them all empty. Whatever
* jobs were queued or running belong to the parent process.
*/
top:
if ((tpool = thread_pools) == NULL)
return;
do {
tpool_active_t *activep;
(void) pthread_mutex_init(&tpool->tp_mutex, NULL);
(void) pthread_cond_init(&tpool->tp_busycv, NULL);
(void) pthread_cond_init(&tpool->tp_workcv, NULL);
(void) pthread_cond_init(&tpool->tp_waitcv, NULL);
for (job = tpool->tp_head; job; job = tpool->tp_head) {
tpool->tp_head = job->tpj_next;
free(job);
}
tpool->tp_tail = NULL;
tpool->tp_njobs = 0;
for (activep = tpool->tp_active; activep;
activep = activep->tpa_next) {
if (activep->tpa_tid == my_tid) {
activep->tpa_next = NULL;
break;
}
}
tpool->tp_idle = 0;
tpool->tp_current = 0;
if ((tpool->tp_active = activep) != NULL)
tpool->tp_current = 1;
tpool->tp_flags &= ~TP_WAIT;
if (tpool->tp_flags & (TP_DESTROY | TP_ABANDON)) {
tpool->tp_flags &= ~TP_DESTROY;
tpool->tp_flags |= TP_ABANDON;
if (tpool->tp_current == 0) {
delete_pool(tpool);
goto top; /* start over */
}
}
} while ((tpool = tpool->tp_forw) != thread_pools);
}