If you haven't studied concurrency before, I can't recommend any tutorials. To start to learn about concurrency, I'd first recommend _some_ reading and theoretical background.
Concurrency is a complex concept. A "10x" multiplier estimation compared to e.g. structured programming is probably right, definitely not a 2x and probably not a 100x. Don't expect to become _proficient_ in concurrent programming in a couple of hours. Probably you won't be able to download a couple of examples and start tinkering with them successfully. A good start is maybe: https://golang.org/doc/faq#csp Then maybe this: https://en.wikipedia.org/wiki/Communicating_sequential_processes The book is available for free: http://www.usingcsp.com/cspbook.pdf Don't expect to absorb the whole book in a couple of hours, it might take from a couple of weeks to a few month to start to see how much you still don't know. As soon as you get a general understanding of concurrent concepts, you'll most probably find adequate tutorials for yourself. (To add to what Jan asked: for sharing code on golang-nuts please share links to play.golang.org.) On 3/1/19, mountain...@gmail.com <mountain...@gmail.com> wrote: > Is there a recommended tutorial? > > 在 2019年3月1日星期五 UTC+8下午12:21:58，Robert Engels写道： >> >> 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, mount...@gmail.com <javascript:> 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) >>>> } >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "golang-nuts" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to golang-nuts...@googlegroups.com. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> -- >> You received this message because you are subscribed to the Google Groups >> >> "golang-nuts" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> >> email to golang-nuts...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> >> > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
