Qualcomm interview questions

First round was a written one.It consisted of aptitude and technical questions on C and some on OS.It was fine but one should focus on speed to clear it, After that there were 2 technical interviews and an HR round. In the technical rounds focus was on basic concepts of C, OOPS concepts related to C++, questions on bitwise operators, a few programming questions and OS. Few of the questions i was asked were - memory management in a C program, on threads and how they work, various types of sorts and there uses, priority inversion, all OOPS concepts were asked to explain, reader/writer problem using semaphores.