mirror
/
go
mirror of https://github.com/golang/go.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

runtime: only permit SetCgoTraceback to be called once 

Accept a duplicate call, but nothing else.

Change-Id: Iec24bf5ddc3b0f0c559ad2158339aca698601743
Reviewed-on: https://go-review.googlesource.com/23692
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Ian Lance Taylor 2016-06-02 12:01:03 -07:00
parent 88e0ec2979
commit 03abde4971
1 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/runtime/traceback.go
View File

@ -962,12 +962,21 @@ func isSystemGoroutine(gp *g) bool {
// traceback function will only be called with the context field set // traceback function will only be called with the context field set
// to zero. If the context function is nil, then calls from Go to C // to zero. If the context function is nil, then calls from Go to C
// to Go will not show a traceback for the C portion of the call stack. // to Go will not show a traceback for the C portion of the call stack.
//
// SetCgoTraceback should be called only once, ideally from an init function.
func SetCgoTraceback(version int, traceback, context, symbolizer unsafe.Pointer) { func SetCgoTraceback(version int, traceback, context, symbolizer unsafe.Pointer) {
if version != 0 { if version != 0 {
panic("unsupported version") panic("unsupported version")
} }
if cgoTraceback != nil && cgoTraceback != traceback ||
cgoContext != nil && cgoContext != context ||
cgoSymbolizer != nil && cgoSymbolizer != symbolizer {
panic("call SetCgoTraceback only once")
}
cgoTraceback = traceback cgoTraceback = traceback
cgoContext = context
cgoSymbolizer = symbolizer cgoSymbolizer = symbolizer
// The context function is called when a C function calls a Go // The context function is called when a C function calls a Go
@ -978,6 +987,7 @@ func SetCgoTraceback(version int, traceback, context, symbolizer unsafe.Pointer)
} }
var cgoTraceback unsafe.Pointer var cgoTraceback unsafe.Pointer
var cgoContext unsafe.Pointer
var cgoSymbolizer unsafe.Pointer var cgoSymbolizer unsafe.Pointer
// cgoTracebackArg is the type passed to cgoTraceback. // cgoTracebackArg is the type passed to cgoTraceback.