Create Semaphore in PHP linux (Centos)

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I'm using Centos 6.5 with php 5.3.3.

I have two processes that I want to prevent from working together. I thought about creating a Semaphore so after browsing online I found this.

This Object doesn't work on my server. When I call the function sem_get(), I get the error: "Call to undefined function sem_get()"

Read about this too and turns out I need to change some compilations on my server to get it to work.

I made these changes and my server collapsed, it caused a huge mess and after restoring the server i'm not going to do that again.

Is there a way to get the above error fixed with a standard include or other solution?

If not, can anyone help me find a way to implement a semaphore in another way or other solution to prevent two process from running at the same time?

I just need a flag to set to true and the other process will check that flag and get out if it is true.

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