I think it would be helpful if you learned more about concurrent programming.
It is 10x harder, even with the simplifications that Go offers. If you don’t
understand the concepts you are going to struggle. Start with some tutorials
and work your way up.
> On Feb 28, 2019, at 10:14 PM, mountain...@gmail.com wrote:
>
> This is the stack information printed when blocking, how to see which G
> blocking program?
>
> SIGABRT: abort
> PC=0x7fff9ceabbf2 m=0 sigcode=0
>
> goroutine 0 [idle]:
> runtime.pthread_cond_wait(0x1967620, 0x19675e0, 0x7fff00000000)
> /usr/local/go/src/runtime/sys_darwin.go:302 +0x51
> runtime.semasleep(0xffffffffffffffff, 0x7fff5fbff670)
> /usr/local/go/src/runtime/os_darwin.go:63 +0x85
> runtime.notesleep(0x19673e0)
> /usr/local/go/src/runtime/lock_sema.go:167 +0xe3
> runtime.stoplockedm()
> /usr/local/go/src/runtime/proc.go:2165 +0x8a
> runtime.schedule()
> /usr/local/go/src/runtime/proc.go:2565 +0x2d9
> runtime.park_m(0xc000072480)
> /usr/local/go/src/runtime/proc.go:2676 +0xae
> runtime.mcall(0x105722b)
> /usr/local/go/src/runtime/asm_amd64.s:299 +0x5b
>
> goroutine 1 [semacquire]:
> sync.runtime_Semacquire(0xc000027794)
> /usr/local/go/src/runtime/sema.go:56 +0x39
> sync.(*WaitGroup).Wait(0xc000027794)
> /usr/local/go/src/sync/waitgroup.go:130 +0x64
> cmd/go/internal/work.(*Builder).Do(0xc00023b0e0, 0xc0003ee3c0)
> /usr/local/go/src/cmd/go/internal/work/exec.go:174 +0x38e
> cmd/go/internal/run.runRun(0x195c300, 0xc00001e0e0, 0x1, 0x1)
> /usr/local/go/src/cmd/go/internal/run/run.go:137 +0x55b
> main.main()
> /usr/local/go/src/cmd/go/main.go:219 +0x7d4
>
> goroutine 5 [syscall]:
> os/signal.signal_recv(0x0)
> /usr/local/go/src/runtime/sigqueue.go:139 +0x9f
> os/signal.loop()
> /usr/local/go/src/os/signal/signal_unix.go:23 +0x22
> created by os/signal.init.0
> /usr/local/go/src/os/signal/signal_unix.go:29 +0x41
>
> goroutine 50 [select]:
> cmd/go/internal/work.(*Builder).Do.func2(0xc000027794, 0xc00023b0e0,
> 0xc0004b0620)
> /usr/local/go/src/cmd/go/internal/work/exec.go:155 +0x12f
> created by cmd/go/internal/work.(*Builder).Do
> /usr/local/go/src/cmd/go/internal/work/exec.go:152 +0x36a
>
> goroutine 51 [select]:
> cmd/go/internal/work.(*Builder).Do.func2(0xc000027794, 0xc00023b0e0,
> 0xc0004b0620)
> /usr/local/go/src/cmd/go/internal/work/exec.go:155 +0x12f
> created by cmd/go/internal/work.(*Builder).Do
> /usr/local/go/src/cmd/go/internal/work/exec.go:152 +0x36a
>
> goroutine 52 [syscall]:
> syscall.Syscall6(0x7, 0x12006, 0xc000050c24, 0x0, 0xc0002f43f0, 0x0, 0x0,
> 0xc0002f43f0, 0x0, 0xc0000e2400)
> /usr/local/go/src/syscall/asm_darwin_amd64.s:41 +0x5
> syscall.wait4(0x12006, 0xc000050c24, 0x0, 0xc0002f43f0, 0x90, 0x1566d60,
> 0x14cc401)
> /usr/local/go/src/syscall/zsyscall_darwin_amd64.go:34 +0x7b
> syscall.Wait4(0x12006, 0xc000050c74, 0x0, 0xc0002f43f0, 0x0, 0x1, 0x1)
> /usr/local/go/src/syscall/syscall_bsd.go:129 +0x51
> os.(*Process).wait(0xc0002fd4a0, 0xc000034a00, 0xc000050cf8, 0x0)
> /usr/local/go/src/os/exec_unix.go:38 +0x7b
> os.(*Process).Wait(0xc0002fd4a0, 0x15b89c8, 0x15b89d0, 0x15b89c0)
> /usr/local/go/src/os/exec.go:125 +0x2b
> os/exec.(*Cmd).Wait(0xc00052da20, 0x0, 0x0)
> /usr/local/go/src/os/exec/exec.go:465 +0x5b
> os/exec.(*Cmd).Run(0xc00052da20, 0x50, 0xc0000df7c0)
> /usr/local/go/src/os/exec/exec.go:309 +0x5c
> cmd/go/internal/base.RunStdin(0xc0000df7c0, 0x1, 0x1)
> /usr/local/go/src/cmd/go/internal/base/base.go:162 +0x11e
> cmd/go/internal/run.buildRunProgram(0xc00023b0e0, 0xc0003ee3c0, 0x13999b3,
> 0xc00023b150)
> /usr/local/go/src/cmd/go/internal/run/run.go:151 +0x26d
> cmd/go/internal/work.(*Builder).Do.func1(0xc0003ee3c0)
> /usr/local/go/src/cmd/go/internal/work/exec.go:107 +0x72
> cmd/go/internal/work.(*Builder).Do.func2(0xc000027794, 0xc00023b0e0,
> 0xc0004b0620)
> /usr/local/go/src/cmd/go/internal/work/exec.go:165 +0xbb
> created by cmd/go/internal/work.(*Builder).Do
> /usr/local/go/src/cmd/go/internal/work/exec.go:152 +0x36a
>
> goroutine 53 [select]:
> cmd/go/internal/work.(*Builder).Do.func2(0xc000027794, 0xc00023b0e0,
> 0xc0004b0620)
> /usr/local/go/src/cmd/go/internal/work/exec.go:155 +0x12f
> created by cmd/go/internal/work.(*Builder).Do
> /usr/local/go/src/cmd/go/internal/work/exec.go:152 +0x36a
>
> goroutine 24 [chan receive]:
> cmd/go/internal/base.processSignals.func1(0xc000086f00)
> /usr/local/go/src/cmd/go/internal/base/signal.go:21 +0x34
> created by cmd/go/internal/base.processSignals
> /usr/local/go/src/cmd/go/internal/base/signal.go:20 +0x93
>
> rax 0x104
> rbx 0xea00
> rcx 0x7fff5fbff488
> rdx 0xea00
> rdi 0x1967620
> rsi 0xea010000eb00
> rbp 0x7fff5fbff520
> rsp 0x7fff5fbff488
> r8 0x0
> r9 0x60
> r10 0x0
> r11 0x202
> r12 0x1967620
> r13 0x16
> r14 0x1
> r15 0x7fffa5c9d3c0
> rip 0x7fff9ceabbf2
> rflags 0x203
> cs 0x7
> fs 0x0
> gs 0x0
>
> 在 2019年2月28日星期四 UTC+8下午8:44:55，Sameer Ajmani写道：
>>
>> The deadlock happens because the channel is empty, so the receive operation
>> blocks forever.
>>
>> The second version imports a package that may start new goroutines in its
>> init functions. If so, those goroutines may not be deadlocked, but the main
>> function is still blocked on the receive operation.
>>
>> It can be useful to send SIGQUIT to a blocked Go program to dump the
>> goroutine stack traces to the terminal.
>>
>> S
>>
>>> On Thu, Feb 28, 2019 at 4:19 AM <mount...@gmail.com> wrote:
>>> dead lock：
>>>
>>> package main
>>>
>>> import (
>>> "fmt"
>>> // _ "github.com/go-sql-driver/mysql"
>>> )
>>>
>>> func main() {
>>> c1 := make(chan int, 10)
>>> fmt.Println(<-c1)
>>> }
>>>
>>>
>>> block：
>>>
>>> package main
>>>
>>> import (
>>> "fmt"
>>>
>>> _ "github.com/go-sql-driver/mysql"
>>> )
>>>
>>> func main() {
>>> c1 := make(chan int, 10)
>>> fmt.Println(<-c1)
>>> }
>>>
>>> --
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>
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