Rewrite unwind thread handling.
This new version doesn't require any specialized thread
implementation, it uses the Current implementation to do its job.
In addition, it runs much faster when multiple threads are trying
to unwind at the same time since the global signal lock is held for
only a small amount of time. Even running through the threads one at
a time should be faster since it no longer requires two passes through
the unwound stacks.
The new code now allows multiple simultaneous unwinds of the
same thread.
Finally, add the ability to unwind from a ucontext_t passed in. This
functionality doesn't work for remote unwinds yet.
Change-Id: I4d181d7ca5ffd2acfd1686e668e6d21e36b425cb
diff --git a/libbacktrace/UnwindCurrent.h b/libbacktrace/UnwindCurrent.h
index 41080c7..2375e6e 100644
--- a/libbacktrace/UnwindCurrent.h
+++ b/libbacktrace/UnwindCurrent.h
@@ -20,7 +20,6 @@
#include <string>
#include "BacktraceImpl.h"
-#include "BacktraceThread.h"
#define UNW_LOCAL_ONLY
#include <libunwind.h>
@@ -30,25 +29,16 @@
UnwindCurrent();
virtual ~UnwindCurrent();
- virtual bool Unwind(size_t num_ignore_frames);
+ virtual bool Unwind(size_t num_ignore_frames, ucontext_t* ucontext);
virtual std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset);
bool UnwindFromContext(size_t num_ignore_frames, bool within_handler);
- void ExtractContext(void* sigcontext);
+ void GetUnwContextFromUcontext(const ucontext_t* context);
protected:
unw_context_t context_;
};
-class UnwindThread : public UnwindCurrent, public BacktraceThreadInterface {
-public:
- UnwindThread();
- virtual ~UnwindThread();
-
- virtual void ThreadUnwind(
- siginfo_t* siginfo, void* sigcontext, size_t num_ignore_frames);
-};
-
#endif // _LIBBACKTRACE_UNWIND_CURRENT_H