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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <inttypes.h>
  4.  
  5. typedef struct atomic_flags {
  6.     unsigned int        flags1       : 2;
  7.     unsigned int        flags2       : 2;
  8.     unsigned int        flags3       : 2;
  9.     unsigned int        flags4       : 2;
  10.     unsigned int        flags5       : 8;
  11.     unsigned int        reserved     : 16;
  12. }atomic_flags;
  13.  
  14. union data {
  15.     atomic_flags    i;
  16.     uint32_t        q;
  17. } data;
  18.  
  19.  
  20.  
  21. int main() {
  22.     union data      test1;
  23.     union data      test2;
  24.  
  25.     test1.i.flags1 = 1;
  26.     test1.i.flags2 = 2; 
  27.     test1.i.flags3 = 3;
  28.     test1.i.flags4 = 2;
  29.     test1.i.flags5 = 241;
  30.     test1.i.reserved = 1337;
  31.  
  32.     printf("%u\n", test1.q);
  33.  
  34.     __atomic_store_n(&test2.q, test1.q, __ATOMIC_SEQ_CST);
  35.  
  36.     printf("test1 flags1: %u\n", test1.i.flags1);
  37.     printf("test1 flags2: %u\n", test1.i.flags2);
  38.     printf("test1 flags3: %u\n", test1.i.flags3);
  39.     printf("test1 flags4: %u\n", test1.i.flags4);
  40.     printf("test1 flags5: %u\n", test1.i.flags5);
  41.     printf("test1 reserved: %u\n", test1.i.reserved);
  42.  
  43.     printf("test2 flags1: %u\n", test2.i.flags1);
  44.     printf("test2 flags2: %u\n", test2.i.flags2);
  45.     printf("test2 flags3: %u\n", test2.i.flags3);
  46.     printf("test2 flags4: %u\n", test2.i.flags4);
  47.     printf("test2 flags5: %u\n", test2.i.flags5);
  48.     printf("test2 reserved: %u\n", test2.i.reserved);
  49.  
  50.     return 0;
  51.  
  52. }
Success #stdin #stdout 0s 2292KB
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stdin
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Standard input is empty
stdout
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87683513
test1 flags1: 1
test1 flags2: 2
test1 flags3: 3
test1 flags4: 2
test1 flags5: 241
test1 reserved: 1337
test2 flags1: 1
test2 flags2: 2
test2 flags3: 3
test2 flags4: 2
test2 flags5: 241
test2 reserved: 1337
https://ideone.com/AVmpEn
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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