diff options
Diffstat (limited to 'gcc-4.8/libgo/runtime/go-callers.c')
| -rw-r--r-- | gcc-4.8/libgo/runtime/go-callers.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc-4.8/libgo/runtime/go-callers.c b/gcc-4.8/libgo/runtime/go-callers.c index 291dfd0d6..ae411d9c8 100644 --- a/gcc-4.8/libgo/runtime/go-callers.c +++ b/gcc-4.8/libgo/runtime/go-callers.c @@ -11,6 +11,13 @@ #include "runtime.h" #include "array.h" +/* This is set to non-zero when calling backtrace_full. This is used + to avoid getting hanging on a recursive lock in dl_iterate_phdr on + older versions of glibc when a SIGPROF signal arrives while + collecting a backtrace. */ + +uint32 runtime_in_callers; + /* Argument passed to callback function. */ struct callers_data @@ -111,8 +118,10 @@ runtime_callers (int32 skip, Location *locbuf, int32 m) data.skip = skip + 1; data.index = 0; data.max = m; + runtime_xadd (&runtime_in_callers, 1); backtrace_full (__go_get_backtrace_state (), 0, callback, error_callback, &data); + runtime_xadd (&runtime_in_callers, -1); return data.index; } |