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| author | Ian Lance Taylor <ian@gcc.gnu.org> | 2013-12-01 01:40:16 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2013-12-01 01:40:16 +0000 |
| commit | 2583109c81b60c64d5ed38e61622c39c1530805f (patch) | |
| tree | 65d707a5cf1d78dd3fd10b552aad7a0bb4d2e983 /libgo/runtime/go-callers.c | |
| parent | 2d7930e5e3876af6cca4c823e03fb75d0f92f9ad (diff) | |
| download | gcc-2583109c81b60c64d5ed38e61622c39c1530805f.zip gcc-2583109c81b60c64d5ed38e61622c39c1530805f.tar.gz gcc-2583109c81b60c64d5ed38e61622c39c1530805f.tar.bz2 | |
libgo: Avoid some cases of getting callers recursively.
Avoids hanging inside older versions of glibc that do not
support recurive calls to dl_iterate_phdr.
From-SVN: r205561
Diffstat (limited to 'libgo/runtime/go-callers.c')
| -rw-r--r-- | libgo/runtime/go-callers.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/libgo/runtime/go-callers.c b/libgo/runtime/go-callers.c index 291dfd0..ae411d9 100644 --- a/libgo/runtime/go-callers.c +++ b/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; } |