7 int cpumap[MAX_NR_CPUS];
9 static int default_cpu_map(void)
13 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
14 assert(nr_cpus <= MAX_NR_CPUS);
15 assert((int)nr_cpus >= 0);
17 for (i = 0; i < nr_cpus; ++i)
23 static int read_all_cpu_map(void)
30 onlnf = fopen("/sys/devices/system/cpu/online", "r");
32 return default_cpu_map();
37 n = fscanf(onlnf, "%u%c", &cpu, &sep);
41 assert(nr_cpus + cpu - prev - 1 < MAX_NR_CPUS);
43 cpumap[nr_cpus++] = prev;
45 assert (nr_cpus < MAX_NR_CPUS);
46 cpumap[nr_cpus++] = cpu;
47 if (n == 2 && sep == '-')
51 if (n == 1 || sep == '\n')
58 return default_cpu_map();
61 int read_cpu_map(const char *cpu_list)
63 unsigned long start_cpu, end_cpu = 0;
68 return read_all_cpu_map();
70 if (!isdigit(*cpu_list))
73 while (isdigit(*cpu_list)) {
75 start_cpu = strtoul(cpu_list, &p, 0);
76 if (start_cpu >= INT_MAX
77 || (*p != '\0' && *p != ',' && *p != '-'))
83 end_cpu = strtoul(cpu_list, &p, 0);
85 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
88 if (end_cpu < start_cpu)
94 for (; start_cpu <= end_cpu; start_cpu++) {
95 /* check for duplicates */
96 for (i = 0; i < nr_cpus; i++)
97 if (cpumap[i] == (int)start_cpu)
100 assert(nr_cpus < MAX_NR_CPUS);
101 cpumap[nr_cpus++] = (int)start_cpu;
111 return default_cpu_map();