Thread Safe Queue container....

[wysota]

wysota, Thanks for your example! Just when I think I'm understanding it, a puzzle: At the end of tryDequeue(), shouldn't it be _semFree.release() instead of _semUsed.release() to note 1 less item in the queue, as in dequeue()?

No. _semFree is released when dequeue() is called. The point of releasing _semUsed is that first you try to acquire it at the beginning of the method to make sure the queue is not empty so then you have to release the lock at the end of the method.

[hazelnusse]

Is the threadsafequeue.tar.gz link still valid for other people? I just tried to download it and am unable to untar it:

luke@ThinkPad-W510:/tmp$ tar xvf threadsafequeue.tar.gz 
tar: This does not look like a tar archive
tar: Skipping to next header
tar: Exiting with failure status due to previous errors

luke@ThinkPad-W510:/tmp$ tar xvf threadsafequeue.tar.gz 
tar: This does not look like a tar archive
tar: Skipping to next header
tar: Exiting with failure status due to previous errors

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Also, the file size when I download it is 990 bytes, but the forum post lists it as 960 bytes.... Anybody else having this issue?

[wysota]

It is tar-gzipped.

[hazelnusse]

It is tar-gzipped.

I am aware that it is tar-gzipped, and I am familiar with working with .tar.gz/.tgz files. `tar xvf` normally gunzips then untars tar-gzipped files just fine, but not this one. To get it to work, I had to do those things in two steps:

$ gunzip threadsafequeue.tar.gz
$ tar x -f threadsafequeue.tar

$ gunzip threadsafequeue.tar.gz
$ tar x -f threadsafequeue.tar

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Which is unusual. Adding the -z option to tar did not fix it either.

[wysota]

`tar xvf` normally gunzips then untars tar-gzipped files just fine

Does it? I was always sure -z option to tar is responsible for ungzipping.

Adding the -z option to tar did not fix it either.

The file was probably gzipped twice, don't ask me how.

[suspiria]

FYI, in the copy of wysota's otherwise excellent ThreadSafeQueue that i downloaded, the return statement is missing from head().

perhaps it has been fixed later and i missed the later version.

thanks.