Non Blocking Channel Operations in Assembly Language

Assembly language doesn’t have direct equivalents for high-level concepts like channels or select statements. However, we can simulate some of these concepts using low-level operations. Here’s a simplified version that demonstrates the concept of non-blocking operations:

section .data
    msg_received db "received message", 0
    msg_not_received db "no message received", 0
    msg_sent db "sent message", 0
    msg_not_sent db "no message sent", 0
    msg_no_activity db "no activity", 0
    message db "hi", 0

section .text
    global _start

_start:
    ; Simulate non-blocking receive
    call check_message_available
    cmp rax, 0
    je .no_message
    mov rdi, msg_received
    call print_string
    jmp .receive_done
.no_message:
    mov rdi, msg_not_received
    call print_string
.receive_done:

    ; Simulate non-blocking send
    call check_can_send
    cmp rax, 0
    je .cannot_send
    mov rdi, msg_sent
    call print_string
    jmp .send_done
.cannot_send:
    mov rdi, msg_not_sent
    call print_string
.send_done:

    ; Simulate multi-way non-blocking select
    call check_message_available
    cmp rax, 0
    jne .message_available
    call check_signal_available
    cmp rax, 0
    jne .signal_available
    mov rdi, msg_no_activity
    call print_string
    jmp .multi_done
.message_available:
    mov rdi, msg_received
    call print_string
    jmp .multi_done
.signal_available:
    mov rdi, msg_received
    call print_string
.multi_done:

    ; Exit program
    mov rax, 60
    xor rdi, rdi
    syscall

; Function to check if a message is available (simulated)
check_message_available:
    xor rax, rax  ; Simulate no message available
    ret

; Function to check if we can send a message (simulated)
check_can_send:
    xor rax, rax  ; Simulate cannot send
    ret

; Function to check if a signal is available (simulated)
check_signal_available:
    xor rax, rax  ; Simulate no signal available
    ret

; Function to print a null-terminated string
print_string:
    push rdi
    call string_length
    mov rdx, rax
    pop rsi
    mov rax, 1
    mov rdi, 1
    syscall
    ret

; Function to calculate string length
string_length:
    xor rax, rax
.loop:
    cmp byte [rdi + rax], 0
    je .done
    inc rax
    jmp .loop
.done:
    ret

This Assembly code simulates the concept of non-blocking channel operations. Here’s how it works:

We define some messages in the .data section that correspond to the different outcomes in the original Go code.
In the _start section, we simulate a non-blocking receive operation:
- We call check_message_available (which always returns 0 in this example, simulating no message available).
- Based on the result, we print either “received message” or “no message received”.
We then simulate a non-blocking send operation in a similar manner:
- We call check_can_send (which always returns 0, simulating that we can’t send).
- We print either “sent message” or “no message sent” based on the result.
Finally, we simulate a multi-way non-blocking select:
- We check for both a message and a signal.
- We print the appropriate message based on what’s available, or “no activity” if neither is available.
The check_message_available, check_can_send, and check_signal_available functions are placeholders that always return 0. In a real program, these would contain logic to check the actual state of messages or signals.
We include utility functions print_string and string_length to handle output.

This Assembly code provides a low-level representation of the concept of non-blocking operations. It doesn’t use actual channels or select statements, as these are high-level constructs not available in Assembly, but it demonstrates the logical flow of checking for availability and taking different actions based on the result.

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Non Blocking Channel Operations in Assembly Language