Qualcomm Interview Question for Software Engineer / Developers






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Process is an instance of a program (needs executable). Thread is an execution of a C-function. A process has its own address space, heap, code memory, data memory, global memory. Each thread has its own stack, thread specific variables, thread context (such as registers, program counter). Memory space of one process does not overlap with that of other process. A process can contain multiple threads. All the threads within a process share the process's memory space. If a thread changes a global variable (memory), other threads accessing global variable will read updated value. Thus, inter-task communication is simpler. The inter-task context switching has less overhead. Whereas, inter-process context switching has more overhead. There is no hierarcy among threads within same process (parent-child-grand child hierarcy).

- pc April 04, 2009 | Flag Reply


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