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  • ruRussian
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00:00:02
I’m continuing today we have a big topic
00:00:04
with the foot of the routine channel and it will be interesting, let’s
00:00:08
go to the first lesson, I focused
00:00:11
on the fact that the gong came out in 2009,
00:00:15
I’m talking about the fact that this is important, why
00:00:17
because it was around this
00:00:19
time that computers were used. became powerful, the
00:00:21
number of processors increased, the
00:00:23
clock frequency increased, the number of
00:00:26
cores increased, and so on, and around the same
00:00:29
time, in the house of 2007 and 2009, the
00:00:35
real benefits of multi-threaded
00:00:39
applications began
00:00:40
because there were a
00:00:42
lot of processors, I leafed through a lot not only in
00:00:45
server equipment but also in their
00:00:46
user equipment equipment and
00:00:51
multithreading began to make sense and the language
00:00:54
was created not so long ago and therefore it
00:00:57
simplifies the work with multithreading and
00:01:00
this multithreading is called go routine
00:01:04
to disk will make it difficult for the
00:01:08
Russian chest and
00:01:11
others but
00:01:23
what is chest and when we run
00:01:28
we when we run and so
00:01:34
we actually launch the chest and the
00:01:38
chest is launched and on the main thread
00:01:41
execution until the entry point is the main
00:01:44
thread has fallen and
00:01:47
we can create the
00:01:50
proceeds
00:01:52
from the main thread how to do this, we
00:01:56
create a method of some kind on any
00:01:58
that simply adds
00:02:02
this simply outputs something - then on the screen
00:02:04
let it be
00:02:10
he just accepts the input
00:02:13
while such sol it is on the screen all
00:02:17
this will be minus 7
00:02:19
nations a
00:02:21
simple function a simple method when
00:02:24
it goes to the game we can just
00:02:26
call it
00:02:27
we can just call it and here we pass
00:02:30
it became we call it is called
00:02:33
first by our fund by the printer, we will delete it and
00:02:37
then call the method, but to call this
00:02:40
routine, well, the head is
00:02:43
simply the keyword year before calling the exchange,
00:02:46
so
00:02:49
black will create a lightweight thread that it
00:02:53
will manage itself,
00:02:56
this
00:02:59
method called through the key method go
00:03:02
is called in a separate thread year
00:03:05
will create a separate thread and call it
00:03:12
in a separate thread without blocking the main
00:03:16
thread, that is, here we can write
00:03:20
some
00:03:24
example
00:03:26
5 seconds
00:03:29
before so that the method sleeps for 5 seconds then pours out
00:03:33
the words and here we can
00:03:36
write
00:03:40
count the duration
00:03:45
,
00:03:47
hit one, so we
00:03:50
call this with us, we would count to 5
00:03:54
faster than a second, why did
00:03:57
n’t this one volunteer now?
00:04:16
inns are created in this basically until he
00:04:19
waits for the execution of this wind so that he
00:04:23
waits we can fall asleep for example for
00:04:26
tests 2 seconds are given
00:04:30
to 2 seconds the main thread would not send
00:04:36
count to 5 win hallow and then
00:04:40
the program ends, that is, we called
00:04:43
this routine it fell asleep on for a second
00:04:46
they counted to five and the main thread
00:04:50
fell asleep the main thread fell asleep of a new type
00:04:53
continues to work because it
00:04:54
works in a separate thread in a separate
00:04:58
thread,
00:04:59
which means others run in the same
00:05:02
address space
00:05:04
so access to shared memory must
00:05:07
be synchronized must be
00:05:10
synchronized we'll talk about this in the
00:05:12
next lesson about the
00:05:15
synchronization primitive, according to the sign, go outside
00:05:17
and in fact that’s all that can be
00:05:20
said about the duck world and launching
00:05:23
separate threads, that is, you have a
00:05:25
method, you can run it in a
00:05:27
separate thread by writing a key spider
00:05:29
and it will work asynchronously
00:05:33
this method will be executed asynchronously with the
00:05:36
main folder in another thread
00:05:39
on the oak and
00:05:41
that’s all that can be said at the chest or
00:05:44
one such basic level, but we
00:05:47
probably have a
00:05:48
[ __ ] question and the question immediately arises:
00:05:50
how can the chest and we communicate with
00:05:53
each other, how to transfer data in general
00:05:56
from the main flow into the chest and others from the
00:05:59
chest and to the main flows and tongue
00:06:02
answers this question with channels in g
00:06:06
there are channels and this is such a tube between
00:06:10
anything between anything year the channel
00:06:15
is created by the keyword cleaning sensual
00:06:17
make former variable SIH
00:06:21
felt make we write that this is a channel and
00:06:24
type yes,
00:06:25
we created a channel to record something in the
00:06:29
channel to record that our channel
00:06:31
give it here we will record one in the channel
00:06:38
gave a
00:06:41
chance we will record it and a personal message that is,
00:06:45
here we write pulled the variable with the channel to us
00:06:48
further arrow arrow
00:06:51
this direction of data that is, if there is
00:06:54
an arrow here is a channel so we write to the
00:06:56
channel if an arrow is from a channel like for
00:06:59
example here like
00:07:13
this
00:07:16
we read from the channel to the arrow from the channel here and the arrow is the
00:07:20
channel and
00:07:23
here from the channel here we read Oscanova
00:07:26
and here we do not write to the channel and
00:07:29
to in fact, now we can count
00:07:33
again up to five or how many times and
00:07:36
now everything will be completed without slips,
00:07:38
why because we start reading from the channel
00:07:42
area,
00:07:49
we counted in one very easily, but we
00:07:54
forgot to
00:07:56
order
00:07:58
with him for a second
00:08:01
and even for 2 we run this for two seconds,
00:08:04
counted to one and now the
00:08:08
main thread has fallen asleep in these now
00:08:10
we will do 10 that belov 1 remove
00:08:14
counted ones and now the main
00:08:18
thread main duty routine is sleeping she is not
00:08:21
sleeping she is waiting for the data to appear in the channel
00:08:24
so only the data appears in the channel
00:08:27
she they are taken into account by us to the printer
00:08:29
displayed on the screen and the flow is completed,
00:08:31
so through the channel we can
00:08:34
wait for the
00:08:37
chest to complete and in this simple way we
00:08:41
just created a channel with the int type, we
00:08:44
can create a channel with the string type and
00:08:46
then
00:08:48
we and the testicle should get it, we
00:08:52
pass the string and
00:08:55
run counted units crisping 10
00:08:59
seconds, well, our chest is 50 seconds and the
00:09:01
main thread is waiting for data from the channels it is
00:09:04
waiting for data from the channel now it
00:09:06
has waited and we got the output hello this is
00:09:10
this printer and
00:09:12
they zid this is this content if you are 400
00:09:14
nova and
00:09:17
output and
00:09:24
since the channel and sending and receiving
00:09:28
block
00:09:31
blocks the flow until the other
00:09:34
country is ready this allows
00:09:36
chest and us to synchronize without
00:09:38
additional log off and race condition
00:09:41
and race condition
00:09:45
allows with the channel and also you can
00:09:48
take into account a lot of things sequentially
00:09:51
let's try to do this
00:09:56
function
00:10:06
average loop
00:10:09
from zero
00:10:17
falls asleep for a conventional 100 milliseconds
00:10:22
mysticism
00:10:24
after which it displays
00:10:26
the words hello
00:10:30
it calls the method the target attaches where
00:10:35
chlorine and
00:10:41
we remove the channel we transfer
00:10:45
the cycle here after which this channel and
00:10:52
after which
00:11:02
we can now
00:11:05
call the safe lol
00:11:08
transfer our channel there and
00:11:12
take into account this soon we
00:11:15
launch
00:11:17
we wait
00:11:24
for
00:11:27
one for a long time each time a few seconds to
00:11:31
hand over he launches the channel channel channel and
00:11:34
we get an error
00:11:38
we get an error
00:11:43
what we get is that he is a guru of teens
00:11:46
ASD-2
00:11:49
why is it just especially are we using
00:11:52
here just you got from the channel
00:12:03
we are launching we are launching the scene we are writing the channel
00:12:13
we are writing in exit the
00:12:16
variable s and a
00:12:21
colleague, for a change, then
00:12:24
we’ll figure it out for a change, we’ll assign a
00:12:26
value from channel c and output it
00:12:30
separately,
00:12:35
let’s figure out why we had
00:12:38
an error and
00:12:43
who am I because I’m running this in the
00:12:46
same thread and one hand program, well, I forgot,
00:12:48
but you see we go down and hello without
00:12:52
any routine not to the chest and when we
00:13:00
write to the channel in the same stream and start reading from the
00:13:03
channel we want a stream but there are
00:13:06
no other streams there is no stream that can
00:13:09
record something this channel the stream is locked
00:13:14
we are waiting so we have we will get a flow
00:13:18
if we now launch the entire hello in the
00:13:21
sternum, everything is
00:13:26
bad with
00:13:29
why because the same thing is that we
00:13:32
launch these different flows of
00:13:34
the ditch cannot be used in the
00:13:38
same under this, it is pointless to write and read the channel sleeve,
00:13:40
and
00:13:42
secondly the flows watch so it won’t
00:13:45
be possible to do it like that, it’s
00:13:46
trivial, not for the sucker of the flow,
00:13:51
that is, we call the cyclone, then we
00:13:54
write to the channel and wait for it to be taken into account from the
00:13:58
channel and finish, we wait until
00:14:01
say flat work, and
00:14:03
we can remove flow here, we
00:14:08
can do
00:14:12
int here, we have five times we can
00:14:17
send ours to the channel five times 5 times each,
00:14:22
so now we make
00:14:25
five screws and
00:14:30
launch we get from 0 to 4 if we
00:14:35
do 6 we get dazlom and
00:14:39
if d-dog why because we
00:14:42
read from the channel from there no one
00:14:45
writes anything and never they won’t write the needle
00:14:48
knows about it and in this such as a job
00:14:52
now it arises obviously the questions are that
00:14:55
how so you have what you need to know
00:14:57
how many times the
00:15:00
data from the channel is calculated here you will
00:15:04
need to know how much data the channel
00:15:06
gets and then read no more no
00:15:08
less and I will say that no, it’s not necessarily
00:15:13
so because you can operate on a channel,
00:15:17
namely, use a for
00:15:22
loop,
00:15:24
how it will work,
00:15:27
and
00:15:30
assignments range
00:15:33
of an tmp,
00:15:37
that is, we operate on a channel us
00:15:40
keyword emphasis further went further
00:15:43
our variable we initialize we
00:15:46
initialize with a value from the channel hot i
00:15:49
in range than, accordingly, he will
00:15:53
wait until they come there to this
00:15:59
we launch zero one two three four and fell
00:16:03
why we fell because we continue to
00:16:06
wait for data from the channel
00:16:09
we further that no one writes from there I
00:16:11
will go up to five times the score was recorded and more
00:16:15
no one writes anything there and the main
00:16:17
thread is still waiting for someone to
00:16:18
write there, one thing no one will ever
00:16:21
write anything again I’ve also finished Sarah
00:16:23
Logic and for this the channels can be
00:16:26
closed
00:16:28
and to
00:16:30
indicate the fact that there
00:16:34
will be no more data friend you stop giving me no
00:16:38
wait for me until the bottom we take and at the end of
00:16:43
the work we do claus x
00:16:46
that is, we close the channel and when we
00:16:49
close the channel we exit from here from
00:16:54
this cycle we will exit the rain I will close the channel
00:16:57
and there will be no more errors
00:17:00
zero one two three four and the
00:17:03
function is holding the knife we ​​closed channel and
00:17:07
channel and this is not the same as files
00:17:11
channels this is not the same as some kind of
00:17:14
fried forest in some principle the resource
00:17:16
does not need to always be closed you can
00:17:18
insert an open lesson we agree
00:17:21
it is put but closing the channel is interesting and
00:17:25
useful and the mechanics are in order to
00:17:29
manage
00:17:31
processes for receiving data from the grooves
00:17:35
up to also an important point:
00:17:39
you can’t send anything to a closed channel; if we send
00:17:42
anything to a closed channel, we will receive
00:17:45
a reminder about not as a separate type of
00:17:49
exception in the gang, the toughest one
00:17:54
can work with them, we will look at this in
00:17:56
one of the following lessons, therefore
00:17:58
closed channel you can’t write anything if
00:18:01
you try to
00:18:04
also
00:18:08
finger from a closed channel but you do
00:18:13
n’t subtract anything from there in this case 40
00:18:20
again you read
00:18:23
get the default value in the again
00:18:27
if there is a stream
00:18:32
with
00:18:34
eske and then subtract empty lines well the
00:18:38
default value for empty and old and
00:18:40
when we initialize the structure, its
00:18:43
fields get
00:18:45
cabbage 0
00:18:51
and
00:18:56
I would also like to parse with you the
00:18:59
select keyword,
00:19:01
it allows us to
00:19:05
take into account several channels and
00:19:09
thus do mode and spider mannequins,
00:19:12
a lot of communication
00:19:14
means the select keyword is
00:19:17
blocked
00:19:18
until then until some case is
00:19:21
executed,
00:19:23
we create a function
00:19:30
phone
00:19:32
function select you what we will do in it
00:19:36
we will launch an infinite loop in it
00:19:40
we despise now x is equal to zero
00:19:45
then we will launch an infinite loop preshov
00:19:47
select 600 case and here we took a channel with
00:19:52
data a channel with data and to
00:19:56
this channel with the data we will
00:19:58
send
00:19:59
we will send x and how the sums we will
00:20:03
add one and the second channel
00:20:06
which we will use is exit if
00:20:09
it came data to exit there and
00:20:13
finishing did not finish the execution of
00:20:17
our endless infinite loop and
00:20:19
exit
00:20:20
physically we should be a channel date
00:20:23
channel exit and these are all channels and covered
00:20:27
2 for
00:20:30
such an endless loop of this we
00:20:33
turned off the minutes select if we have
00:20:37
a case and this deduction came to us we
00:20:40
will leave Turkey if we didn’t come then we for
00:20:43
overwritten the data to the [ __ ] if someone
00:20:46
reads something from the date we will write down the given
00:20:49
date sharply functions we need to create a
00:20:58
date channel create an exit channel
00:21:01
after that
00:21:04
we need to eat now a function
00:21:07
that will read the date channel but
00:21:10
before that there
00:21:12
will be an important point I will now
00:21:14
create an anonymous function and just for
00:21:18
a minute and function like this
00:21:20
and do it routinely, so I created an
00:21:23
anonymous function
00:21:24
when just an anonymous function
00:21:26
is called and when you start it will be
00:21:29
called
00:21:30
now I’ll comment it out, we’ve
00:21:34
already discussed this in one of the lessons,
00:21:38
we run the function
00:21:40
when we get the lackey, this function
00:21:44
is called if I don’t substitute the new guy to the
00:21:47
keyword then this will become the chest and
00:21:49
it will begin to give or and now in this in
00:21:53
this group I create a method for and
00:21:58
convey let’s calculate and we will
00:22:02
subtract
00:22:03
from the channel and date
00:22:08
[music]
00:22:10
data 10
00:22:13
10 times we
00:22:15
take into account
00:22:17
when we subtracted 10 times we need sound
00:22:21
channel exit send code what
00:22:25
we say that we have finished we need the case
00:22:29
channel exit it will be an indication that the
00:22:33
data is large for more data is not
00:22:34
needed there will be no more data
00:22:37
but no one else a little more no one is going to read I’m
00:22:39
not going to read in principle you can drink more
00:22:42
stopped don’t see this x
00:22:45
we we indulge in the channel date channels where and
00:22:50
launches and
00:22:53
we have zero one two three four five
00:22:56
six seven eight nine that is, we
00:23:00
read the data ten times then we
00:23:04
send it to exit 0 here we have an
00:23:06
infinite loop and select if someone
00:23:10
reads data from date to from channel date
00:23:13
then we send X X to this channel and
00:23:17
add it as one if no one
00:23:20
reads from the date we look if the data is in the
00:23:24
channel and even if the data
00:23:27
channel appears exit we prince prince the line
00:23:30
and enter an infinite loop
00:23:32
if not here not there then there is no one
00:23:35
reading the data from the date and drink no one
00:23:38
writes anything we will sit and wait for
00:23:42
an eternity of
00:23:44
a month until someone any date records
00:23:47
the ride then it doesn’t come across to read or in
00:23:49
excel someone didn’t send anything and
00:23:52
among other things
00:23:54
if we wait it’s not necessary, here you can
00:23:58
make a cheap section
00:24:10
and the default function will be called if it didn’t work for us, or
00:24:13
something else, here we can essentially
00:24:20
describe the rating before Whiting and fall
00:24:23
asleep with two until, for a certain number of
00:24:28
milliseconds,
00:24:29
fall asleep and wait
00:24:32
again, and sold then start reading again
00:24:35
the data appeared or did not appear before the
00:24:43
cape, we sorted out the main things about the currency,
00:24:47
our next lesson will be devoted to the
00:24:48
synchronization primitive, today that’s
00:24:51
all, thank you very much for watching, like,
00:24:54
support the channel, write
00:24:56
comments,
00:24:57
yes, I also wanted to add something, you
00:25:00
asked for homework,
00:25:04
let’s try with you
00:25:08
try without synchronization primitives
00:25:13
to whom salary without
00:25:20
synchronization primitive that is, without the singa package
00:25:25
write
00:25:27
an asynchronous and crazy calculator
00:25:30
calculator on their chest that is, what that
00:25:34
it should take as input for then it
00:25:37
should take two plus two
00:25:39
three plus s 600 so on and
00:25:44
multiply 7 7 multiply by 87 by 7 to 9
00:25:49
divide by 3 and then run each expression
00:25:54
asynchronously, that is, calculate each expression
00:25:56
in the chest and
00:26:01
each expression, that is, I
00:26:04
must give it as input such a
00:26:07
piece, such a set of expressions, and
00:26:11
its result should be
00:26:16
like this line
00:26:19
499 or you can do it beautifully before
00:26:21
output it beautifully
00:26:25
as a result of payments like this like this
00:26:28
line
00:26:29
he should take the original expression and
00:26:32
add the answer to it like this
00:26:35
what does this calculator mean about
00:26:40
homework now let’s try to
00:26:42
do this it will work it won’t work that means how
00:26:44
to pass how to pass take take go to
00:26:48
getjar create an account there from not
00:26:50
created create
00:26:53
repositories are you
00:26:55
successful in transferring to this repository
00:26:58
write the code for this stone of the network where
00:27:03
cannons
00:27:04
twig
00:27:06
main branch to renamed century eat and
00:27:10
twig mine and create a record
00:27:14
on the tatami. it and and on the branch there will be a
00:27:17
calculator calculator and create a gender
00:27:20
request
00:27:22
calculate like an alka
00:27:25
calculator
00:27:26
was this the class you create
00:27:31
viewers recognized here create a branch in
00:27:34
this branch a calculator
00:27:37
write code for the committee eat and a branch
00:27:41
calculator and create a semi request
00:27:43
branches a calculator and and further telegram
00:27:48
after month
00:27:50
group where you go and
00:27:55
send
00:27:57
there a link to Paul's quest I go in
00:28:03
to take a shot of a view of a
00:28:06
virgin girlfriend
00:28:09
before you
00:28:12
can write such a
00:28:14
calculator on the chest in different ways and nah this is not a
00:28:17
trivial story Dasha an interesting
00:28:20
task there will be questions also come to
00:28:22
telegram we will discuss possible
00:28:26
solutions also boorish
00:28:29
Telegram is inconvenient, you can go to the VKontakte group
00:28:31
there, too, I’m there, send
00:28:34
the quest round there, we’ll also discuss it,
00:28:36
we’ve also done it for centuries, that’s
00:28:40
exactly it, thank you very much for
00:28:43
watching
00:28:46
bye

Description:

В этом видео мы поговорим про многопоточность: горутины и каналы в языке Go. В этой серии уроков мы научимся разрабатывать используя язык Golang. Начнем с азов и закончим полноценным приложением с API, бизнес логикой и базой данных. P.S. это последнее видео в котором отвратный звук. Я все купил для звука и теперь он будет гораздо лучше, уже почти закончил монтаж ролика про Apache Kafka. С радостью хочу вам представить, что я запускаю курс “Начальная подготовка” по языку Golang. Курс как для совсем начинающих в сфере IT, так и для тех, кто хочет просто изучить язык Go. Больше обо мне и курсах можно прочитать здесь: https://artofedu.org/ Больше информации есть в ролике на ютубе: https://www.youtube.com/watch?v=E0b0dmwf-6c На все вопросы могу ответить в Телеграм группе канала и в личных сообщениях. Урок 1. Начало. Веб-сервер в 3 строки в конце урока! https://www.youtube.com/watch?v=G6eZaX_lgbQ Урок 2. Основы. Продолжение. Циклы, ветвления https://www.youtube.com/watch?v=5MZWiUHdSBA Урок 3. Основы. Продолжение. Указатели, структуры, массивы и слайсы https://www.youtube.com/watch?v=0s3Jz8Y_cq8 Урок 4. Основы. Итератор for range и структура map https://www.youtube.com/watch?v=uixi3pH0fgw Урок 5. Основы. Функции и методы https://www.youtube.com/watch?v=NmNjOiKHQt4 Урок 6. Основы. Интерфейсы https://www.youtube.com/watch?v=vR-UVn-5AOs Урок 7. Основы. Ошибки https://www.youtube.com/watch?v=a3Byzdiey9Y Урок 8. Основы. Тестирование. Часть 1 https://www.youtube.com/watch?v=smJmTERC1cw Другие видео: Изучаем Python. Основы + Бонус: Пишем приложение на FastAPI https://www.youtube.com/watch?v=JTbNTllXJBk Разработка системы заметок на Python, Golang и микросервисы в 2021 году https://www.youtube.com/watch?v=Txi95RQPRP0 Как стать разработчиком. Часть 1 https://www.youtube.com/watch?v=tUQrrm3UcbI Что такое микросервисы за 200 секунд https://www.youtube.com/watch?v=Q99r7ssHrvU VK: https://vk.com/theartofdevel Telegram Group: https://t.me/theartofdevel Дружественный Golang чат: https://t.me/gogolang ---- Меня зовут Артур Карапетов и я занимаюсь всем, что связано с разработкой. Я создаю высоконагруженные информационные системы, стартапы, занимаюсь личным обучением людей в сфере разработки (программисты, аналитики, системные администраторы), также я помогаю компаниям и стартапам с обучением людей работать и повышением их квалификации, об этом можно почитать здесь: https://mitkadr.ru. На этом канале я выкладываю ролики на интересующие меня темы, здесь можно найти серию роликов про создание информационной системы с нуля, а также можно найти серию уроков по языкам, которые я люблю. Добро пожаловать и хорошего просмотра!

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