X-Spam-Check-By: sourceware.org Message-ID: X-Sender: drbtq AT hotmail DOT com From: "Drake Baker" To: cygwin AT cygwin DOT com Subject: Inter-Process Mutexes Date: Mon, 04 Sep 2006 01:49:25 -0500 Mime-Version: 1.0 Content-Type: text/plain; format=flowed Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Gentlemen, I have seen conflicting information on the web concerning inter-process mutexes in CYGWIN. I have seen outright statements that it is not supported, and I have seen statements that ALL mutexes are inter-process by default. Obviously, only one statement is currently correct. The bottom line is that I have some shared memory and multiple processes -- basically a critical section. I need a technique to implement the critical section, and preferably a solution that is portable. I have tried for countless hours over the last few days before concluding that process shared mutexes don't exist in CYGWIN despite some google results implying they do. (I hope I am wrong, and it does support them). Any solution that will work in CYGWIN and a Linux box would be appreciated -- all I need is a critical section for mutliple processes. Thank you in advance for your help! -Drake --- snippets for reference, in case my assumption is wrong (not actual code, simplified cuts) ... initializing pthread_mutexattr_init(&mattr); // create default attributes, returns no error pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED); // set for inter-process sharing (it is returning EINVAL) pthread_mutex_init(&mutex, &mattr); // init, returns no error ... locking/etc... pthread_mutex_lock(&mutex) // returns no error in process that init'd mutex, EINVAL in other processes _________________________________________________________________ Get real-time traffic reports with Windows Live Local Search http://local.live.com/default.aspx?v=2&cp=42.336065~-109.392273&style=r&lvl=4&scene=3712634&trfc=1 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/