2. Write a C program for each of the following system calls (one per call) which uses the call in a normal manner. Make sure that your program compiles and executes without error. Show the output from each of the programs. Please check for, and report, any errors. Terminate execution on error (do not continue running if a call fails). a) sbrk b) fork c) sched_getaffinity The last one is a bit tricky. The main page has a lot of useful information on the parameters. The cpu_set_t is an opaque type: You are not meant to manipulate it directly. There are macros in sched.h which will set/clear/test members of the set. The man page for CPU_SET(3) describes these. Of particular interest is CPU_ISSET. The number of cores can be found with sysconf(_SC_NJPROCESSORS_ONLN). This is the number of hyperthreads, not the number of raw cores. It is also the size of the CPU mask. #include #include int main() { } long ncores = sysconf(_SC_NPROCESSORS_ONLN); printf("%d cores found\n", ncores); The CPU mask is a list of values which are either 1 or 0 depending on whether the given process is allowed to run on that logical core. You can iterate over possible values: for (i = 0; i

2. Write a C program for each of the following system calls (one per call) which uses the call in a normal manner. Make sure that your program compiles and executes without error. Show the output from each of the programs. Please check for, and report, any errors. Terminate execution on error (do not continue running if a call fails). a) sbrk b) fork c) sched_getaffinity The last one is a bit tricky. The main page has a lot of useful information on the parameters. The cpu_set_t is an opaque type: You are not meant to manipulate it directly. There are macros in sched.h which will set/clear/test members of the set. The man page for CPU_SET(3) describes these. Of particular interest is CPU_ISSET. The number of cores can be found with sysconf(_SC_NJPROCESSORS_ONLN). This is the number of hyperthreads, not the number of raw cores. It is also the size of the CPU mask. #include #include int main() { } long ncores = sysconf(_SC_NPROCESSORS_ONLN); printf("%d cores found\n", ncores); The CPU mask is a list of values which are either 1 or 0 depending on whether the given process is allowed to run on that logical core. You can iterate over possible values: for (i = 0; i

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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