February 2020
Intermediate to advanced
292 pages
8h 54m
English
Content preview from C++ System Programming Cookbook
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How it works...
Step 1 does two things. First, it prints the default affinity mask. We can see that the process is scheduled to run on all the processors. Second, it prepares cpu_set_t, which represents a set of CPUs, by initializing it with the CPU_ZERO macro and setting the affinity on CPU 3 with the CPU_SET macro. Note that the cpu_set_t object must be manipulated directly but only via the macro provided. A full list of macros is documented on the man page: man cpu_set.
Step 2 calls the sched_setaffinity() system call to set the affinity (specified in the mask variable, that is, cpu_set_t) on the process with the PID returned by the getpid() function. We could have passed 0 instead of getpid(), meaning the current process. After the
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