brpc/src/bthread/bthread.cpp at master · apache/brpc · GitHub

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// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements. See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership. The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License. You may obtain a copy of the License at

// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied. See the License for the

// specific language governing permissions and limitations

// under the License.

// bthread - An M:N threading library to make applications more concurrent.

// Date: Tue Jul 10 17:40:58 CST 2012

#include <sys/syscall.h>

#include <gflags/gflags.h>

#include "butil/macros.h" // BAIDU_CASSERT

#include "butil/logging.h"

#include "butil/thread_local.h"

#include "butil/reloadable_flags.h"

#include "bthread/task_group.h" // TaskGroup

#include "bthread/task_control.h" // TaskControl

#include "bthread/timer_thread.h"

#include "bthread/list_of_abafree_id.h"

#include "bthread/bthread.h"

namespace bthread {

extern void print_task(std::ostream& os, bthread_t tid, bool enable_trace,

bool ignore_not_matched = false);

static bool validate_bthread_concurrency(const char*, int32_t val) {

// bthread_setconcurrency sets the flag on success path which should

// not be strictly in a validator. But it's OK for a int flag.

return bthread_setconcurrency(val) == 0;

}

static bool validate_bthread_min_concurrency(const char*, int32_t val);

static bool validate_bthread_current_tag(const char*, int32_t val);

static bool validate_bthread_concurrency_by_tag(const char*, int32_t val);

DEFINE_int32(bthread_concurrency, 8 + BTHREAD_EPOLL_THREAD_NUM,

"Number of pthread workers");

BUTIL_VALIDATE_GFLAG(bthread_concurrency, validate_bthread_concurrency);

DEFINE_int32(bthread_min_concurrency, 0,

"Initial number of pthread workers which will be added on-demand."

" The laziness is disabled when this value is non-positive,"

" and workers will be created eagerly according to -bthread_concurrency and bthread_setconcurrency(). ");

BUTIL_VALIDATE_GFLAG(bthread_min_concurrency, validate_bthread_min_concurrency);

DEFINE_int32(bthread_current_tag, BTHREAD_TAG_INVALID, "Set bthread concurrency for this tag");

BUTIL_VALIDATE_GFLAG(bthread_current_tag, validate_bthread_current_tag);

DEFINE_int32(bthread_concurrency_by_tag, 8 + BTHREAD_EPOLL_THREAD_NUM,

"Number of pthread workers of FLAGS_bthread_current_tag");

BUTIL_VALIDATE_GFLAG(bthread_concurrency_by_tag, validate_bthread_concurrency_by_tag);

DEFINE_int32(bthread_parking_lot_of_each_tag, 4, "Number of parking lots of each tag");

BUTIL_VALIDATE_GFLAG(bthread_parking_lot_of_each_tag, [](const char*, int32_t val) {

if (val < BTHREAD_MIN_PARKINGLOT) {

LOG(ERROR) << "bthread_parking_lot_of_each_tag must be greater than or equal to "

<< BTHREAD_MIN_PARKINGLOT;

return false;

}

if (val > BTHREAD_MAX_PARKINGLOT) {

LOG(ERROR) << "bthread_parking_lot_of_each_tag must be less than or equal to "

<< BTHREAD_MAX_PARKINGLOT;

return false;

}

return true;

});

static bool never_set_bthread_concurrency = true;

BAIDU_CASSERT(sizeof(TaskControl*) == sizeof(butil::atomic<TaskControl*>), atomic_size_match);

pthread_mutex_t g_task_control_mutex = PTHREAD_MUTEX_INITIALIZER;

// Referenced in rpc, needs to be extern.

// Notice that we can't declare the variable as atomic<TaskControl*> which

// are not constructed before main().

TaskControl* g_task_control = nullptr;

EXTERN_BAIDU_VOLATILE_THREAD_LOCAL(TaskGroup*, tls_task_group);

extern void (*g_worker_startfn)();

extern void (*g_tagged_worker_startfn)(bthread_tag_t);

inline TaskControl* get_task_control() {

return g_task_control;

}

inline TaskControl* get_or_new_task_control() {

butil::atomic<TaskControl*>* p = (butil::atomic<TaskControl*>*)&g_task_control;

TaskControl* c = p->load(butil::memory_order_consume);

if (c != nullptr) {

return c;

}

BAIDU_SCOPED_LOCK(g_task_control_mutex);

c = p->load(butil::memory_order_consume);

if (c != nullptr) {

return c;

}

c = new TaskControl;

int concurrency = FLAGS_bthread_min_concurrency > 0 ?

FLAGS_bthread_min_concurrency :

FLAGS_bthread_concurrency;

if (c->init(concurrency) != 0) {

LOG(ERROR) << "Fail to init g_task_control";

delete c;

return nullptr;

}

p->store(c, butil::memory_order_release);

return c;

}

#ifdef BRPC_BTHREAD_TRACER

BAIDU_THREAD_LOCAL TaskMeta* pthread_fake_meta = nullptr;

bthread_t init_for_pthread_stack_trace() {

if (nullptr != pthread_fake_meta) {

return pthread_fake_meta->tid;

}

TaskControl* c = get_task_control();

if (nullptr == c) {

LOG(ERROR) << "TaskControl has not been created, "

"please use bthread_start_xxx before call this function";

return INVALID_BTHREAD;

}

butil::ResourceId<TaskMeta> slot;

pthread_fake_meta = butil::get_resource(&slot);

if (BAIDU_UNLIKELY(nullptr == pthread_fake_meta)) {

LOG(ERROR) << "Fail to get TaskMeta";

return INVALID_BTHREAD;

}

pthread_fake_meta->attr = BTHREAD_ATTR_PTHREAD;

pthread_fake_meta->tid = make_tid(*pthread_fake_meta->version_butex, slot);

// Make TaskTracer use signal trace mode for pthread.

c->_task_tracer.set_running_status(syscall(SYS_gettid), pthread_fake_meta);

// Release the TaskMeta at exit of pthread.

butil::thread_atexit([]() {

// Similar to TaskGroup::task_runner.

bool tracing;

{

BAIDU_SCOPED_LOCK(pthread_fake_meta->version_lock);

tracing = TaskTracer::set_end_status_unsafe(pthread_fake_meta);

// If resulting version is 0,

// change it to 1 to make bthread_t never be 0.

if (0 == ++*pthread_fake_meta->version_butex) {

++*pthread_fake_meta->version_butex;

}

if (tracing) {

// Wait for tracing completion.

get_task_control()->_task_tracer.WaitForTracing(pthread_fake_meta);

}

get_task_control()->_task_tracer.set_status(

TASK_STATUS_UNKNOWN, pthread_fake_meta);

butil::return_resource(get_slot(pthread_fake_meta->tid));

pthread_fake_meta = nullptr;

});

return pthread_fake_meta->tid;

}

void stack_trace(std::ostream& os, bthread_t tid) {

TaskControl* c = get_task_control();

if (nullptr == c) {

os << "TaskControl has not been created";

return;

}

c->stack_trace(os, tid);

}

std::string stack_trace(bthread_t tid) {

TaskControl* c = get_task_control();

if (nullptr == c) {

return "TaskControl has not been created";

}

return c->stack_trace(tid);

}

#endif // BRPC_BTHREAD_TRACER

// Print all living (started and not finished) bthreads

void print_living_tasks(std::ostream& os, bool enable_trace) {

TaskControl* c = get_task_control();

if (nullptr == c) {

os << "TaskControl has not been created";

return;

}

auto tids = c->get_living_bthreads();

if (tids.empty()) {

os << "No living bthreads\n";

return;

}

for (auto tid : tids) {

print_task(os, tid, enable_trace, true);

}

static int add_workers_for_each_tag(int num) {

int added = 0;

auto c = get_task_control();

for (auto i = 0; i < num; ++i) {

added += c->add_workers(1, i % FLAGS_task_group_ntags);

}

return added;

}

static bool validate_bthread_min_concurrency(const char*, int32_t val) {

if (val <= 0) {

return true;

}

if (val < BTHREAD_MIN_CONCURRENCY || val > FLAGS_bthread_concurrency) {

return false;

}

TaskControl* c = get_task_control();

if (!c) {

return true;

}

BAIDU_SCOPED_LOCK(g_task_control_mutex);

int concurrency = c->concurrency();

if (val > concurrency) {

int added = bthread::add_workers_for_each_tag(val - concurrency);

return added == (val - concurrency);

} else {

return true;

}

static bool validate_bthread_current_tag(const char*, int32_t val) {

if (val == BTHREAD_TAG_INVALID) {

return true;

} else if (val < BTHREAD_TAG_DEFAULT || val >= FLAGS_task_group_ntags) {

return false;

}

BAIDU_SCOPED_LOCK(bthread::g_task_control_mutex);

auto c = get_task_control();

if (c == nullptr) {

FLAGS_bthread_concurrency_by_tag = 8 + BTHREAD_EPOLL_THREAD_NUM;

return true;

}

FLAGS_bthread_concurrency_by_tag = c->concurrency(val);

return true;

}

static bool validate_bthread_concurrency_by_tag(const char*, int32_t val) {

return bthread_setconcurrency_by_tag(val, FLAGS_bthread_current_tag) == 0;

}

BAIDU_VOLATILE_THREAD_LOCAL(TaskGroup*, tls_task_group_nosignal, nullptr);

BUTIL_FORCE_INLINE int

start_from_non_worker(bthread_t* __restrict tid,

const bthread_attr_t* __restrict attr,

void* (*fn)(void*),

void* __restrict arg) {

TaskControl* c = get_or_new_task_control();

if (nullptr == c) {

return ENOMEM;

}

bthread_tag_t tag = BTHREAD_TAG_DEFAULT;

if (attr != nullptr && attr->tag != BTHREAD_TAG_INVALID) {

tag = attr->tag;

}

if (attr != nullptr && (attr->flags & BTHREAD_NOSIGNAL)) {

// Remember the TaskGroup to insert NOSIGNAL tasks for 2 reasons:

// 1. NOSIGNAL is often for creating many bthreads in batch,

// inserting into the same TaskGroup maximizes the batch.

// 2. bthread_flush() needs to know which TaskGroup to flush.

auto g = BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group_nosignal);

if (nullptr == g) {

g = c->choose_one_group(tag);

BAIDU_SET_VOLATILE_THREAD_LOCAL(tls_task_group_nosignal, g);

} else {

// tls_task_group_nosignal is not tag-aware: mixing different

// tags with BTHREAD_NOSIGNAL on the same non-worker thread is

// not supported, otherwise bthreads would be silently inserted

// into a TaskGroup of the wrong tag.

CHECK_EQ(g->tag(), tag) << "Mixing different tags with "

"BTHREAD_NOSIGNAL on the same thread is not supported, "

"expected tag=" << g->tag() << " but got tag=" << tag;

}

return g->start_background<true>(tid, attr, fn, arg);

}

return c->choose_one_group(tag)->start_background<true>(tid, attr, fn, arg);

}

// Meet one of the three conditions, can run in thread local

// attr is nullptr

// tag equal to thread local

// tag equal to BTHREAD_TAG_INVALID

BUTIL_FORCE_INLINE bool can_run_thread_local(const bthread_attr_t* __restrict attr) {

return attr == nullptr ||

attr->tag == BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group)->tag() ||

attr->tag == BTHREAD_TAG_INVALID;

}

struct TidTraits {

static const size_t BLOCK_SIZE = 63;

static const size_t MAX_ENTRIES = 65536;

static const size_t INIT_GC_SIZE = 65536;

static const bthread_t ID_INIT;

static bool exists(bthread_t id) { return bthread::TaskGroup::exists(id); }

};

const bthread_t TidTraits::ID_INIT = INVALID_BTHREAD;

typedef ListOfABAFreeId<bthread_t, TidTraits> TidList;

struct TidStopper {

void operator()(bthread_t id) const { bthread_stop(id); }

};

struct TidJoiner {

void operator()(bthread_t & id) const {

bthread_join(id, nullptr);

id = INVALID_BTHREAD;

}

};

} // namespace bthread

extern "C" {

int bthread_start_urgent(bthread_t* __restrict tid,

const bthread_attr_t* __restrict attr,

void * (*fn)(void*),

void* __restrict arg) {

bthread::TaskGroup* g = bthread::BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group);

if (g) {

// if attribute is null use thread local task group

if (bthread::can_run_thread_local(attr)) {

return bthread::TaskGroup::start_foreground(&g, tid, attr, fn, arg);

}

return bthread::start_from_non_worker(tid, attr, fn, arg);

}

int bthread_start_background(bthread_t* __restrict tid,

const bthread_attr_t* __restrict attr,

void * (*fn)(void*),

void* __restrict arg) {

bthread::TaskGroup* g = bthread::BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group);

if (g) {

// if attribute is null use thread local task group

if (bthread::can_run_thread_local(attr)) {

return g->start_background<false>(tid, attr, fn, arg);

}

return bthread::start_from_non_worker(tid, attr, fn, arg);

}

void bthread_flush() {

bthread::TaskGroup* g = bthread::BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group);

if (g) {

return g->flush_nosignal_tasks();

}

g = bthread::BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group_nosignal);

if (g) {

// NOSIGNAL tasks were created in this non-worker.

bthread::BAIDU_SET_VOLATILE_THREAD_LOCAL(tls_task_group_nosignal, nullptr);

return g->flush_nosignal_tasks_remote();

}

int bthread_interrupt(bthread_t tid, bthread_tag_t /*tag*/) {

return bthread::TaskGroup::interrupt(tid, bthread::get_task_control());

}

int bthread_stop(bthread_t tid) {

bthread::TaskGroup::set_stopped(tid);

return bthread_interrupt(tid);

}

int bthread_stopped(bthread_t tid) {

return (int)bthread::TaskGroup::is_stopped(tid);

}

bthread_t bthread_self(void) {

bthread::TaskGroup* g = bthread::BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group);

// note: return 0 for main tasks now, which include main thread and

// all work threads. So that we can identify main tasks from logs

// more easily. This is probably questionable in the future.

if (g != nullptr && !g->is_current_main_task()/*note*/) {

return g->current_tid();

}

return INVALID_BTHREAD;

}

int bthread_equal(bthread_t t1, bthread_t t2) {

return t1 == t2;

}

void bthread_exit(void* retval) {

bthread::TaskGroup* g = bthread::BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group);

if (g != nullptr && !g->is_current_main_task()) {

throw bthread::ExitException(retval);

} else {

pthread_exit(retval);

}

int bthread_join(bthread_t tid, void** thread_return) {

return bthread::TaskGroup::join(tid, thread_return);

}

int bthread_attr_init(bthread_attr_t* a) {

*a = BTHREAD_ATTR_NORMAL;

return 0;

}

int bthread_attr_destroy(bthread_attr_t*) {

return 0;

}

int bthread_getattr(bthread_t tid, bthread_attr_t* attr) {

return bthread::TaskGroup::get_attr(tid, attr);

}

int bthread_getconcurrency(void) {

return bthread::FLAGS_bthread_concurrency;

}

int bthread_setconcurrency(int num) {

if (num < BTHREAD_MIN_CONCURRENCY || num > BTHREAD_MAX_CONCURRENCY) {

LOG(ERROR) << "Invalid concurrency=" << num;

return EINVAL;

}

if (bthread::FLAGS_bthread_min_concurrency > 0) {

if (num < bthread::FLAGS_bthread_min_concurrency) {

return EINVAL;

}

if (bthread::never_set_bthread_concurrency) {

bthread::never_set_bthread_concurrency = false;

}

bthread::FLAGS_bthread_concurrency = num;

return 0;

}

bthread::TaskControl* c = bthread::get_task_control();

if (c != nullptr) {

if (num < c->concurrency()) {

return EPERM;

} else if (num == c->concurrency()) {

return 0;

}

BAIDU_SCOPED_LOCK(bthread::g_task_control_mutex);

c = bthread::get_task_control();

if (c == nullptr) {

if (bthread::never_set_bthread_concurrency) {

bthread::never_set_bthread_concurrency = false;

bthread::FLAGS_bthread_concurrency = num;

} else if (num > bthread::FLAGS_bthread_concurrency) {

bthread::FLAGS_bthread_concurrency = num;

}

return 0;

}

if (bthread::FLAGS_bthread_concurrency != c->concurrency()) {

LOG(ERROR) << "CHECK failed: bthread_concurrency="

<< bthread::FLAGS_bthread_concurrency

<< " != tc_concurrency=" << c->concurrency();

bthread::FLAGS_bthread_concurrency = c->concurrency();

}

if (num > bthread::FLAGS_bthread_concurrency) {

// Create more workers if needed.

auto added = bthread::add_workers_for_each_tag(num - bthread::FLAGS_bthread_concurrency);

bthread::FLAGS_bthread_concurrency += added;

}

return (num == bthread::FLAGS_bthread_concurrency ? 0 : EPERM);

}

int bthread_getconcurrency_by_tag(bthread_tag_t tag) {

BAIDU_SCOPED_LOCK(bthread::g_task_control_mutex);

auto c = bthread::get_task_control();

if (c == nullptr) {

return EPERM;

}

return c->concurrency(tag);

}

int bthread_setconcurrency_by_tag(int num, bthread_tag_t tag) {

if (tag == BTHREAD_TAG_INVALID) {

return 0;

} else if (tag < BTHREAD_TAG_DEFAULT || tag >= FLAGS_task_group_ntags) {

return EINVAL;

}

if (num < BTHREAD_MIN_CONCURRENCY || num > BTHREAD_MAX_CONCURRENCY) {

LOG(ERROR) << "Invalid concurrency_by_tag=" << num;

return EINVAL;

}

auto c = bthread::get_or_new_task_control();

BAIDU_SCOPED_LOCK(bthread::g_task_control_mutex);

auto tag_ngroup = c->concurrency(tag);

auto add = num - tag_ngroup;

if (add >= 0) {

auto added = c->add_workers(add, tag);

bthread::FLAGS_bthread_concurrency += added;

return (add == added ? 0 : EPERM);

} else {

LOG(WARNING) << "Fail to set concurrency by tag: " << tag

<< ", tag concurrency should be larger than old oncurrency. old concurrency: "

<< tag_ngroup << ", new concurrency: " << num;

return EPERM;

}

int bthread_about_to_quit() {

bthread::TaskGroup* g = bthread::BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group);

if (g != nullptr) {

bthread::TaskMeta* current_task = g->current_task();

if(!(current_task->attr.flags & BTHREAD_NEVER_QUIT)) {

current_task->about_to_quit = true;

}

return 0;

}

return EPERM;

}

int bthread_timer_add(bthread_timer_t* id, timespec abstime,

void (*on_timer)(void*), void* arg) {

bthread::TaskControl* c = bthread::get_or_new_task_control();

if (c == nullptr) {

return ENOMEM;

}

bthread::TimerThread* tt = bthread::get_or_create_global_timer_thread();

if (tt == nullptr) {

return ENOMEM;

}

bthread_timer_t tmp = tt->schedule(on_timer, arg, abstime);

if (tmp != 0) {

*id = tmp;

return 0;

}

return ESTOP;

}

int bthread_timer_del(bthread_timer_t id) {

bthread::TaskControl* c = bthread::get_task_control();

if (c != nullptr) {

bthread::TimerThread* tt = bthread::get_global_timer_thread();

if (tt == nullptr) {

return EINVAL;

}

const int state = tt->unschedule(id);

if (state >= 0) {

return state;

}

return EINVAL;

}

int bthread_usleep(uint64_t microseconds) {

bthread::TaskGroup* g = bthread::BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group);

if (nullptr != g && !g->is_current_pthread_task()) {

return bthread::TaskGroup::usleep(&g, microseconds);

}

return ::usleep(microseconds);

}

int bthread_yield(void) {

bthread::TaskGroup* g = bthread::BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group);

if (nullptr != g && !g->is_current_pthread_task()) {

bthread::TaskGroup::yield(&g);

return 0;

}

// pthread_yield is not available on MAC

return sched_yield();

}

int bthread_set_worker_startfn(void (*start_fn)()) {

if (start_fn == nullptr) {

return EINVAL;

}

bthread::g_worker_startfn = start_fn;

return 0;

}

int bthread_set_tagged_worker_startfn(void (*start_fn)(bthread_tag_t)) {

if (start_fn == nullptr) {

return EINVAL;

}

bthread::g_tagged_worker_startfn = start_fn;

return 0;

}

void bthread_stop_world() {

bthread::TaskControl* c = bthread::get_task_control();

if (c != nullptr) {

c->stop_and_join();

}

int bthread_list_init(bthread_list_t* list,

unsigned /*size*/,

unsigned /*conflict_size*/) {

list->impl = new bthread::TidList;

// Set unused fields to zero as well.

list->head = 0;

list->size = 0;

list->conflict_head = 0;

list->conflict_size = 0;

return 0;

}

void bthread_list_destroy(bthread_list_t* list) {

delete static_cast<bthread::TidList*>(list->impl);

list->impl = nullptr;

}

int bthread_list_add(bthread_list_t* list, bthread_t id) {

if (list->impl == nullptr) {

return EINVAL;

}

return static_cast<bthread::TidList*>(list->impl)->add(id);

}

int bthread_list_stop(bthread_list_t* list) {

if (list->impl == nullptr) {

return EINVAL;

}

static_cast<bthread::TidList*>(list->impl)->apply(bthread::TidStopper());

return 0;

}

int bthread_list_join(bthread_list_t* list) {

if (list->impl == nullptr) {

return EINVAL;

}

static_cast<bthread::TidList*>(list->impl)->apply(bthread::TidJoiner());

return 0;

}

bthread_tag_t bthread_self_tag(void) {

bthread::TaskGroup* g = bthread::BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group);

return g != nullptr ? g->tag() : BTHREAD_TAG_DEFAULT;

}

uint64_t bthread_cpu_clock_ns(void) {

bthread::TaskGroup* g = bthread::BAIDU_GET_VOLATILE_THREAD_LOCAL(tls_task_group);

if (g != nullptr && !g->is_current_main_task()) {

return g->current_task_cpu_clock_ns();

}

return 0;

}

int bthread_set_span_funcs(bthread_create_span_fn create_fn,

bthread_destroy_span_fn destroy_fn,

bthread_end_span_fn end_fn) {

if ((create_fn && destroy_fn && end_fn) ||

(!create_fn && !destroy_fn && !end_fn)) {

bthread::g_create_bthread_span = create_fn;

bthread::g_rpcz_parent_span_dtor = destroy_fn;

bthread::g_end_bthread_span = end_fn;

return 0;

}

errno = EINVAL;

return -1;

}

} // extern "C"

void bthread_attr_set_name(bthread_attr_t* attr, const char* name) {

if (attr) {

strncpy(attr->name, name, BTHREAD_NAME_MAX_LENGTH);

attr->name[BTHREAD_NAME_MAX_LENGTH] = '\0';

}

brpc/src/bthread/bthread.cpp at master · apache/brpc · GitHub

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