The differences between channel buffer capacity of zero and one in golang
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I have set channel buffer size to zero, like var intChannelZero = make(chan int) , when getting value from the intChannelZero will be blocked until the intChannelZero has value.
Also, I set channel buffer size to one, like var intChannelOne = make(chan int, 1), when getting value from the intChannelOne will be blocked until the intChannelOne has value.
We know the capacity of intChannelZero is zero, the capacity of intChannelOne is one, so I want to know:
- When putting a value to the
intChannelZerolikeintChannelZero <- 1, where the value be saved? - The differences between
intChannelZeroandintChannelOnewhen putting a value to them.
Who can explain it at the level of Golang Runtime Enviroment? Thanks a lot.
go
asked Nov 17 '18 at 4:25
Shuai JunlanShuai Junlan
65110
add a comment |
I have set channel buffer size to zero, like var intChannelZero = make(chan int) , when getting value from the intChannelZero will be blocked until the intChannelZero has value.
Also, I set channel buffer size to one, like var intChannelOne = make(chan int, 1), when getting value from the intChannelOne will be blocked until the intChannelOne has value.
We know the capacity of intChannelZero is zero, the capacity of intChannelOne is one, so I want to know:
- When putting a value to the
intChannelZerolikeintChannelZero <- 1, where the value be saved? - The differences between
intChannelZeroandintChannelOnewhen putting a value to them.
Who can explain it at the level of Golang Runtime Enviroment? Thanks a lot.
go
asked Nov 17 '18 at 4:25
Shuai JunlanShuai Junlan
65110
add a comment |
I have set channel buffer size to zero, like var intChannelZero = make(chan int) , when getting value from the intChannelZero will be blocked until the intChannelZero has value.
Also, I set channel buffer size to one, like var intChannelOne = make(chan int, 1), when getting value from the intChannelOne will be blocked until the intChannelOne has value.
We know the capacity of intChannelZero is zero, the capacity of intChannelOne is one, so I want to know:
- When putting a value to the
intChannelZerolikeintChannelZero <- 1, where the value be saved? - The differences between
intChannelZeroandintChannelOnewhen putting a value to them.
Who can explain it at the level of Golang Runtime Enviroment? Thanks a lot.
go
asked Nov 17 '18 at 4:25
Shuai JunlanShuai Junlan
65110
I have set channel buffer size to zero, like var intChannelZero = make(chan int) , when getting value from the intChannelZero will be blocked until the intChannelZero has value.
Also, I set channel buffer size to one, like var intChannelOne = make(chan int, 1), when getting value from the intChannelOne will be blocked until the intChannelOne has value.
We know the capacity of intChannelZero is zero, the capacity of intChannelOne is one, so I want to know:
- When putting a value to the
intChannelZerolikeintChannelZero <- 1, where the value be saved? - The differences between
intChannelZeroandintChannelOnewhen putting a value to them.
Who can explain it at the level of Golang Runtime Enviroment? Thanks a lot.
go
go
asked Nov 17 '18 at 4:25
Shuai JunlanShuai Junlan
65110
asked Nov 17 '18 at 4:25
Shuai JunlanShuai Junlan
65110
edited Nov 17 '18 at 4:34
Shuai Junlan
asked Nov 17 '18 at 4:25
Shuai JunlanShuai Junlan
65110
asked Nov 17 '18 at 4:25
Shuai JunlanShuai Junlan
65110
asked Nov 17 '18 at 4:25
Shuai JunlanShuai Junlan
65110
65110
add a comment |
add a comment |
2 Answers
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If the channel is unbuffered (capacity is zero), then communication succeeds only when the sender and receiver are both ready.
If the channel is buffered (capacity >= 1), then send succeeds without blocking if the channel is not full and receive succeeds without blocking if the buffer is not empty.
When putting a value to the intChannelZero like intChannelZero <- 1, where the value be saved?
The value is copied from the sender to the receiver. The value is not saved anywhere other than whatever temporary variables the implementation might use.
The differences between intChannelZero and intChannelOne when putting a value to them.
Send on intChannelZero blocks until a receiver is ready.
Send on intChannelOne blocks until space is available in the buffer.
answered Nov 17 '18 at 6:27
Cerise LimónCerise Limón
55.7k57395
add a comment |
Both unbuffered and buffered channel differences will be in terms of,
- Sends to channel is blocked
- Receives from channel is blocked
For unbuffered channels
Sends will be blocked if the channel already send a message and hasn't yet been received.
Receives will be blocked if no sends ever happened.
For buffered channels
Sends will be blocked if already n(channel size) sends happened and none of them received. ie entire channel size has been used by messages send but nothing was received.
Receives will be blocked if the buffer is empty ie doesn't have any unconsumed sends
Runtime errors
Receive blocked will throw the bellow error
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [chan receive]:
Send blocked will throw the bellow error
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [chan send]:
answered Nov 17 '18 at 7:16
JeevanJeevan
1426
add a comment |
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2 Answers
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active
oldest
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2 Answers
2
active
oldest
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active
oldest
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active
oldest
votes
If the channel is unbuffered (capacity is zero), then communication succeeds only when the sender and receiver are both ready.
If the channel is buffered (capacity >= 1), then send succeeds without blocking if the channel is not full and receive succeeds without blocking if the buffer is not empty.
When putting a value to the intChannelZero like intChannelZero <- 1, where the value be saved?
The value is copied from the sender to the receiver. The value is not saved anywhere other than whatever temporary variables the implementation might use.
The differences between intChannelZero and intChannelOne when putting a value to them.
Send on intChannelZero blocks until a receiver is ready.
Send on intChannelOne blocks until space is available in the buffer.
answered Nov 17 '18 at 6:27
Cerise LimónCerise Limón
55.7k57395
add a comment |
If the channel is unbuffered (capacity is zero), then communication succeeds only when the sender and receiver are both ready.
If the channel is buffered (capacity >= 1), then send succeeds without blocking if the channel is not full and receive succeeds without blocking if the buffer is not empty.
When putting a value to the intChannelZero like intChannelZero <- 1, where the value be saved?
The value is copied from the sender to the receiver. The value is not saved anywhere other than whatever temporary variables the implementation might use.
The differences between intChannelZero and intChannelOne when putting a value to them.
Send on intChannelZero blocks until a receiver is ready.
Send on intChannelOne blocks until space is available in the buffer.
answered Nov 17 '18 at 6:27
Cerise LimónCerise Limón
55.7k57395
add a comment |
If the channel is unbuffered (capacity is zero), then communication succeeds only when the sender and receiver are both ready.
If the channel is buffered (capacity >= 1), then send succeeds without blocking if the channel is not full and receive succeeds without blocking if the buffer is not empty.
When putting a value to the intChannelZero like intChannelZero <- 1, where the value be saved?
The value is copied from the sender to the receiver. The value is not saved anywhere other than whatever temporary variables the implementation might use.
The differences between intChannelZero and intChannelOne when putting a value to them.
Send on intChannelZero blocks until a receiver is ready.
Send on intChannelOne blocks until space is available in the buffer.
answered Nov 17 '18 at 6:27
Cerise LimónCerise Limón
55.7k57395
If the channel is unbuffered (capacity is zero), then communication succeeds only when the sender and receiver are both ready.
If the channel is buffered (capacity >= 1), then send succeeds without blocking if the channel is not full and receive succeeds without blocking if the buffer is not empty.
When putting a value to the intChannelZero like intChannelZero <- 1, where the value be saved?
The value is copied from the sender to the receiver. The value is not saved anywhere other than whatever temporary variables the implementation might use.
The differences between intChannelZero and intChannelOne when putting a value to them.
Send on intChannelZero blocks until a receiver is ready.
Send on intChannelOne blocks until space is available in the buffer.
answered Nov 17 '18 at 6:27
Cerise LimónCerise Limón
55.7k57395
answered Nov 17 '18 at 6:27
Cerise LimónCerise Limón
55.7k57395
answered Nov 17 '18 at 6:27
Cerise LimónCerise Limón
55.7k57395
answered Nov 17 '18 at 6:27
Cerise LimónCerise Limón
55.7k57395
55.7k57395
add a comment |
add a comment |
Both unbuffered and buffered channel differences will be in terms of,
- Sends to channel is blocked
- Receives from channel is blocked
For unbuffered channels
Sends will be blocked if the channel already send a message and hasn't yet been received.
Receives will be blocked if no sends ever happened.
For buffered channels
Sends will be blocked if already n(channel size) sends happened and none of them received. ie entire channel size has been used by messages send but nothing was received.
Receives will be blocked if the buffer is empty ie doesn't have any unconsumed sends
Runtime errors
Receive blocked will throw the bellow error
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [chan receive]:
Send blocked will throw the bellow error
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [chan send]:
answered Nov 17 '18 at 7:16
JeevanJeevan
1426
add a comment |
Both unbuffered and buffered channel differences will be in terms of,
- Sends to channel is blocked
- Receives from channel is blocked
For unbuffered channels
Sends will be blocked if the channel already send a message and hasn't yet been received.
Receives will be blocked if no sends ever happened.
For buffered channels
Sends will be blocked if already n(channel size) sends happened and none of them received. ie entire channel size has been used by messages send but nothing was received.
Receives will be blocked if the buffer is empty ie doesn't have any unconsumed sends
Runtime errors
Receive blocked will throw the bellow error
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [chan receive]:
Send blocked will throw the bellow error
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [chan send]:
answered Nov 17 '18 at 7:16
JeevanJeevan
1426
add a comment |
Both unbuffered and buffered channel differences will be in terms of,
- Sends to channel is blocked
- Receives from channel is blocked
For unbuffered channels
Sends will be blocked if the channel already send a message and hasn't yet been received.
Receives will be blocked if no sends ever happened.
For buffered channels
Sends will be blocked if already n(channel size) sends happened and none of them received. ie entire channel size has been used by messages send but nothing was received.
Receives will be blocked if the buffer is empty ie doesn't have any unconsumed sends
Runtime errors
Receive blocked will throw the bellow error
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [chan receive]:
Send blocked will throw the bellow error
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [chan send]:
answered Nov 17 '18 at 7:16
JeevanJeevan
1426
Both unbuffered and buffered channel differences will be in terms of,
- Sends to channel is blocked
- Receives from channel is blocked
For unbuffered channels
Sends will be blocked if the channel already send a message and hasn't yet been received.
Receives will be blocked if no sends ever happened.
For buffered channels
Sends will be blocked if already n(channel size) sends happened and none of them received. ie entire channel size has been used by messages send but nothing was received.
Receives will be blocked if the buffer is empty ie doesn't have any unconsumed sends
Runtime errors
Receive blocked will throw the bellow error
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [chan receive]:
Send blocked will throw the bellow error
fatal error: all goroutines are asleep - deadlock!
goroutine 1 [chan send]:
answered Nov 17 '18 at 7:16
JeevanJeevan
1426
answered Nov 17 '18 at 7:16
JeevanJeevan
1426
answered Nov 17 '18 at 7:16
JeevanJeevan
1426
answered Nov 17 '18 at 7:16
JeevanJeevan
1426
1426
add a comment |
add a comment |
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