runtime/pprof: support OS X CPU profiling
Work around profiling kernel bug with signal masks.
Still broken on 64-bit Snow Leopard kernel,
but I think we can ignore that one and let people
upgrade to Lion.
Add new trivial tools addr2line and objdump to take
the place of the GNU tools of the same name, since
those are not installed on OS X.
Adapt pprof to invoke 'go tool addr2line' and
'go tool objdump' if the system tools do not exist.
Clean up disassembly of base register on amd64.
Fixes #2008.
R=golang-dev, bradfitz, mikioh.mikioh, r, iant
CC=golang-dev
https://golang.org/cl/5697066
diff --git a/src/pkg/runtime/runtime.h b/src/pkg/runtime/runtime.h
index 3b0f505..f2669fd 100644
--- a/src/pkg/runtime/runtime.h
+++ b/src/pkg/runtime/runtime.h
@@ -730,3 +730,13 @@
void runtime·ifaceE2I(struct InterfaceType*, Eface, Iface*);
uintptr runtime·memlimit(void);
+
+// If appropriate, ask the operating system to control whether this
+// thread should receive profiling signals. This is only necessary on OS X.
+// An operating system should not deliver a profiling signal to a
+// thread that is not actually executing (what good is that?), but that's
+// what OS X prefers to do. When profiling is turned on, we mask
+// away the profiling signal when threads go to sleep, so that OS X
+// is forced to deliver the signal to a thread that's actually running.
+// This is a no-op on other systems.
+void runtime·setprof(bool);
