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The dynamic memory allocator is a layer between the application and the OS, managing heap objects. When a program requests memory from the allocator (via malloc(), for instance), the allocator will return a pointer (or reference) to a piece of memory of the appropriate size. When the program is done with the memory, the memory should be released back to the allocator. Languages such as C and C++ leave this job to the programmer to perform manually, for example by using free(). On the other hand, languages such as Java, python, etc automatically manage dynamically-allocated memory, which makes the programmer's life easier, and can eliminate entire classes of memory management bugs.
Although using free() and delete is relatively simple, it can be tricky to get them right. A signi?cant fraction of bugs in C and C++ programs are related to manual memory management. If we forget to free objects, we end up with memory leaks; if we free memory too soon, we end up with "dangling pointers"; also, we can try to do weird things, like performing double frees, etc. Therefore, a process that manages memory automatically is clearly useful. The most important concept for correctly implementing a garbage collector is that of live objects: a live object is any object that can still be reached through one (or more) pointers.
Note that the parameter for scanf doesn't need the address operators & because name is an address. However the variable name has no defined space. This can cause problems within C
Define busy waiting and spinlock. When a process is in its significant section, any other process that tries to enter its critical section must loop continuously in the entry c
Question: A set of processes are in a deadlock state when every process in the set is waiting for an event that can be caused by only another process in the set. (a) There
Demand paging gives that pages could only be brought into memory if the running process acts them. This is usually referred to as lazy evaluation as only those pages operated by
what is independent process? distinguished between independent process and co-operating process
List sample file types, based on use, on the VAX under VMS. source programs (.BAS, .FOR, .COB, .PLI, .PAS, .MAR) data files (.DAT) text files (.TXT) command proced
Explain the TlsAlloc (VOID) This function is used to allocate a TLS index.Any subsequent TLS function calls will require the handle returned from TlsAlloc to be passed. The i
Several schemes available are as follows: Pipes : One-way communication process through which different process can interact. The problem is that the two processes could have
What is graceful degradation? In multiprocessor systems, failure of single processor will not halt the system, but only slow it down by sharing the work of failure system by ot
what is cpu
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