1 #ifndef LIBOMP_TEST_AFFINITY_H
2 #define LIBOMP_TEST_AFFINITY_H
3 
4 #ifndef _GNU_SOURCE
5 #define _GNU_SOURCE
6 #endif
7 #include <sched.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 typedef struct affinity_mask_t {
12   size_t setsize;
13   cpu_set_t *set;
14 } affinity_mask_t;
15 
16 #define AFFINITY_MAX_CPUS (32 * 64)
17 
18 // Operating system affinity mask API
19 static void affinity_mask_zero(affinity_mask_t *mask) {
20   CPU_ZERO_S(mask->setsize, mask->set);
21 }
22 
23 static affinity_mask_t *affinity_mask_alloc() {
24   size_t setsize = CPU_ALLOC_SIZE(AFFINITY_MAX_CPUS);
25   cpu_set_t *set = CPU_ALLOC(AFFINITY_MAX_CPUS);
26   affinity_mask_t *retval = (affinity_mask_t *)malloc(sizeof(affinity_mask_t));
27   retval->setsize = setsize;
28   retval->set = set;
29   affinity_mask_zero(retval);
30   return retval;
31 }
32 
33 static void affinity_mask_free(affinity_mask_t *mask) { CPU_FREE(mask->set); }
34 
35 static void affinity_mask_copy(affinity_mask_t *dest,
36                                const affinity_mask_t *src) {
37   memcpy(dest->set, src->set, dest->setsize);
38 }
39 
40 static void affinity_mask_set(affinity_mask_t *mask, int cpu) {
41   CPU_SET_S(cpu, mask->setsize, mask->set);
42 }
43 
44 static void affinity_mask_clr(affinity_mask_t *mask, int cpu) {
45   CPU_CLR_S(cpu, mask->setsize, mask->set);
46 }
47 
48 static int affinity_mask_isset(const affinity_mask_t *mask, int cpu) {
49   return CPU_ISSET_S(cpu, mask->setsize, mask->set);
50 }
51 
52 static int affinity_mask_count(const affinity_mask_t *mask) {
53   return CPU_COUNT_S(mask->setsize, mask->set);
54 }
55 
56 static int affinity_mask_equal(const affinity_mask_t *mask1,
57                                const affinity_mask_t *mask2) {
58   return CPU_EQUAL_S(mask1->setsize, mask1->set, mask2->set);
59 }
60 
61 static void get_thread_affinity(affinity_mask_t *mask) {
62   if (sched_getaffinity(0, mask->setsize, mask->set) != 0) {
63     perror("sched_getaffinity()");
64     exit(EXIT_FAILURE);
65   }
66 }
67 
68 static void set_thread_affinity(const affinity_mask_t *mask) {
69   if (sched_setaffinity(0, mask->setsize, mask->set) != 0) {
70     perror("sched_setaffinity()");
71     exit(EXIT_FAILURE);
72   }
73 }
74 
75 static void affinity_update_snprintf_values(char **ptr, size_t *remaining,
76                                             size_t n, size_t *retval) {
77   if (n > *remaining && *remaining > 0) {
78     *ptr += *remaining;
79     *remaining = 0;
80   } else {
81     *ptr += n;
82     *remaining -= n;
83   }
84   *retval += n;
85 }
86 
87 static size_t affinity_mask_snprintf(char *buf, size_t bufsize,
88                                      const affinity_mask_t *mask) {
89   int cpu, need_comma, begin, end;
90   size_t n;
91   char *ptr = buf;
92   size_t remaining = bufsize;
93   size_t retval = 0;
94 
95   n = snprintf(ptr, remaining, "%c", '{');
96   affinity_update_snprintf_values(&ptr, &remaining, n, &retval);
97 
98   need_comma = 0;
99   for (cpu = 0; cpu < AFFINITY_MAX_CPUS; cpu++) {
100     if (!affinity_mask_isset(mask, cpu))
101       continue;
102     if (need_comma) {
103       n = snprintf(ptr, remaining, "%c", ',');
104       affinity_update_snprintf_values(&ptr, &remaining, n, &retval);
105     }
106     begin = cpu;
107     // Find end of range (inclusive end)
108     for (end = begin + 1; end < AFFINITY_MAX_CPUS; ++end) {
109       if (!affinity_mask_isset(mask, end))
110         break;
111     }
112     end--;
113 
114     if (end - begin >= 2) {
115       n = snprintf(ptr, remaining, "%d-%d", begin, end);
116       affinity_update_snprintf_values(&ptr, &remaining, n, &retval);
117     } else if (end - begin == 1) {
118       n = snprintf(ptr, remaining, "%d,%d", begin, end);
119       affinity_update_snprintf_values(&ptr, &remaining, n, &retval);
120     } else if (end - begin == 0) {
121       n = snprintf(ptr, remaining, "%d", begin);
122       affinity_update_snprintf_values(&ptr, &remaining, n, &retval);
123     }
124     need_comma = 1;
125     cpu = end;
126   }
127   n = snprintf(ptr, remaining, "%c", '}');
128   affinity_update_snprintf_values(&ptr, &remaining, n, &retval);
129   return retval;
130 }
131 #endif
132