<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=iso-8859-1"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hello,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We're using mod_event_zmq module (slightly modified, we use different socket type and IPC instead of TCP), and experience crashes.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>As far as I understood the module it creates ZMQ context and all event sent by using same context.<o:p></o:p></p><p class=MsoNormal>Events callback is called from different threads, isn't it? And can be a situation when different threads access send() api on this context simultaneously. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>ZMQ guide strongly prohibits doing that: " You MUST NOT share ØMQ sockets between threads."<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>And when I do a mutex around send() there're no more crashes (at least today).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Am I missing something or mod_event_zmq is potentially dangerous?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>--<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Best Regards,</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Alex Massover</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>