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Semaphore variable is different from ordinary variable by _______

Asked by: Interview Candidate | Asked on: Jul 22nd, 2005
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sachin chakote

Answered On : Jul 22nd, 2005

A semaphore is a special varible that takes only whole positive numbers and upon which only two operations are allowed: wait and signal. They are used to ensure that a single executing process has exclusive access to a resource.  
The operation are  
 
p(SV) for wait 
V(SV) for signal SV- Semaphore variable. 
 
The definition of these two operation are very easy 
p(SV) If SV is greater than zero then decreament SV if becomes zero suspend the execution of the process. 
V(SV) if some other process has been suspended waiting for SV then make if resume execution if no process is suspended waiting for sv then increment it. 
 
 
 
 
 
 
 

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