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cmd/cgo: LockOSThread in callback #3775

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dvyukov opened this issue Jun 25, 2012 · 6 comments

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@dvyukov
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commented Jun 25, 2012

package main
/*
void lockOSThreadCallback(void);
inline static void lockOSThreadC(void)
{
        lockOSThreadCallback();
}
int usleep(unsigned usec);
inline static void sleep(void)
{
  usleep(100000);
}
*/
import "C"
import "runtime"
func main() {
    C.lockOSThreadC()
}
//export lockOSThreadCallback
func lockOSThreadCallback() {
    runtime.LockOSThread()
    runtime.UnlockOSThread()
    go func() {
        C.sleep()
    }()
    runtime.Gosched()
}

linux/amd64$ go run cgo.go
panic: runtime error: call of nil func value
[signal 0xb code=0x1 addr=0x0 pc=0x0]
@dvyukov

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commented Jun 25, 2012

Comment 1:

An obvious solution is to add recursion counter into LockOSThread(). However, it's not
yet implemented, so I suspect there are some reasons.
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commented Sep 12, 2012

Comment 2:

Labels changed: added priority-later, removed priority-triage.

Status changed to Accepted.

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commented Sep 12, 2012

Comment 3:

Labels changed: added go1.1.

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commented Dec 10, 2012

Comment 4:

Labels changed: added size-l.

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commented Feb 1, 2013

Comment 5:

Owner changed to @rsc.

Status changed to Started.

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commented Feb 1, 2013

Comment 6:

This issue was closed by revision b0a29f3.

Status changed to Fixed.

@dvyukov dvyukov added fixed labels Feb 1, 2013

@rsc rsc added this to the Go1.1 milestone Apr 14, 2015

@rsc rsc removed the go1.1 label Apr 14, 2015

@golang golang locked and limited conversation to collaborators Jun 24, 2016

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