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Multi Lock File
Why were there not any arrest?
The Montgomery County Police Department arrived after being called by a neighbor and dispersed the crowd but no charges were filed. Perhaps a multi-million dollar lawsuit against SEIU and the DC Police Department is in order here? A teen aged boy was scared to death and locked himself in a bathroom while police officers, the peoples children are taught to seek for help, not watched him be terrorized. ?
cause Obama sent them
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Just Cause 2 - Multi-lock Missile Launcher (DLC 4.29)
Programming: POSIX.1 standard (multi-threading/synchronization?)?
Hi all,
I am trying to do a project using POSIX to implement multiple threads, each representing a reader or a writer (the reader/writer problem.)
The issue I am having is one reader and one writer are suppose to request access at the same time. Priority should be given to he reader (in this case that is, theres a parameters file involved) but since both threads run at practically the same time (im on a dual-core computer) sometimes the writer thread executed slightly ahead of time, acquires the op_lock (condition variable), checks if there are any readers, and seeing none (yet) goes ahead and executes. Then the reader follows up and sees there is an active writer and has to wait. Sometimes this happens the other way around, where the reader checks first, so it is able to execute first (as is suppose to be) but this is erratic behavior.
Any suggestions?? Thanks.
Erratic behavior is precisely what you should expect from threads. It sounds to me like your code is working properly, att least, in the case of the writer getting there first. The writer is allowed to write if there are no readers waiting. It can't be expected to 'guess' that there's a reader coming along in just a few nanoseconds and hold off. It already won 
You could try a statistical approach. Instead of creating 1 reader, create multiple. Readers can starve writers, but writers can't starve readers. That should show up if you measure how often a reader runs vs. the writer. As you add more readers the writer should become more and more starved. Eventually, it will not run at all.
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