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Pau Espin Pedrol gerrit-no-reply at lists.osmocom.orgPau Espin Pedrol has uploaded this change for review. ( https://gerrit.osmocom.org/10739 Change subject: Logger: Disable pthread cancel point inside Logger destructor ...................................................................... Logger: Disable pthread cancel point inside Logger destructor pthread_cancel is implemented in c++ using exception handlers. In destructor of Log object, the log function is called which will eventually call fputs() to write to a file. Since that function is considered a cancelation point, if pthread_cancel has been called the exception handler will start unstacking frames and calling destructors in the process. At some point this will cause a runtime exception in c++ which will call std::terminate() to abort the process. The solution is thus to avoid starting the cancellation process inside the destructor. This behavior was spotted while calling the destructor of Transceiver object in forthcoming patches. See a more detailed example here: https://skaark.wordpress.com/2010/08/26/pthread_cancel-considered-harmful/ Change-Id: I71ca90f3fbc73df58b878a03361f7b7831d838b4 --- M CommonLibs/Logger.cpp 1 file changed, 3 insertions(+), 0 deletions(-) git pull ssh://gerrit.osmocom.org:29418/osmo-trx refs/changes/39/10739/1 diff --git a/CommonLibs/Logger.cpp b/CommonLibs/Logger.cpp index 393d882..171c635 100644 --- a/CommonLibs/Logger.cpp +++ b/CommonLibs/Logger.cpp @@ -44,6 +44,8 @@ Log::~Log() { + int old_state; + pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_state); int mlen = mStream.str().size(); int neednl = (mlen==0 || mStream.str()[mlen-1] != '\n'); const char *fmt = neednl ? "%s\n" : "%s"; @@ -51,6 +53,7 @@ // The COUT() macro prevents messages from stomping each other but adds uninteresting thread numbers, // so just use std::cout. LOGPSRC(mCategory, mPriority, filename, line, fmt, mStream.str().c_str()); + pthread_setcancelstate(old_state, NULL); } ostringstream& Log::get() -- To view, visit https://gerrit.osmocom.org/10739 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-trx Gerrit-Branch: master Gerrit-MessageType: newchange Gerrit-Change-Id: I71ca90f3fbc73df58b878a03361f7b7831d838b4 Gerrit-Change-Number: 10739 Gerrit-PatchSet: 1 Gerrit-Owner: Pau Espin Pedrol <pespin at sysmocom.de> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/gerrit-log/attachments/20180903/42193cb3/attachment.htm>