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runtime/pprof: document SetCPUProfile with c-archive/c-shared

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When using c-archive/c-shared, the signal handler for SIGPROF will not
be installed, which means that runtime/pprof.StartCPUProfile won't work.
There is no really good solution here, as the main program may want to
do its own profiling.  For now, just document that runtime/pprof doesn't
work as expected, but that it will work if you use Notify to install the
Go signal handler.

Fixes #14043.

Change-Id: I7ff7a01df6ef7f63a7f050aac3674d640a246fb4
Reviewed-on: https://go-review.googlesource.com/18911
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
This commit is contained in:
Ian Lance Taylor 2016-01-25 09:54:39 -08:00
parent cedbbfaa45
commit 7688ffe134
1 changed files with 8 additions and 0 deletions
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8
src/runtime/pprof/pprof.go
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@ -567,6 +567,14 @@ var cpu struct {
// StartCPUProfile enables CPU profiling for the current process.
// While profiling, the profile will be buffered and written to w.
// StartCPUProfile returns an error if profiling is already enabled.
//
// On Unix-like systems, StartCPUProfile does not work by default for
// Go code built with -buildmode=c-archive or -buildmode=c-shared.
// StartCPUProfile relies on the SIGPROF signal, but that signal will
// be delivered to the main program's SIGPROF signal handler (if any)
// not to the one used by Go. To make it work, call os/signal.Notify
// for syscall.SIGPROF, but note that doing so may break any profiling
// being done by the main program.
func StartCPUProfile(w io.Writer) error {
// The runtime routines allow a variable profiling rate,
// but in practice operating systems cannot trigger signals