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design query: where to lock mutex for function accessing global value?

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# 1  
Old 03-19-2012
design query: where to lock mutex for function accessing global value?
Hi,
Suppose I have a function that accesses and increments a global variable . This function is run as part of thread. One locks mutex in the function and unlocks it after the processing is done. Is there any alternative way? Thanks in advance.
# 2  
Old 03-19-2012
Depends how you use the variable. If you have one writer and many readers, you could try a reader-writer lock; readers will be able to share it simultaneously, but writers will get an exclusive lock first.
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