GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/util/atomic.h
Date: 2026-05-19 11:45:12
Exec Total Coverage
Lines: 41 43 95.3%
Branches: 8 8 100.0%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 *
4 * Defines wrapper functions for atomic integer operations. Atomic operations
5 * are handled by GCC.
6 */
7
8 #ifndef CVMFS_UTIL_ATOMIC_H_
9 #define CVMFS_UTIL_ATOMIC_H_
10
11 #include <stdint.h>
12
13 #ifdef CVMFS_NAMESPACE_GUARD
14 namespace CVMFS_NAMESPACE_GUARD {
15 #endif
16
17 typedef int32_t atomic_int32;
18 typedef int64_t atomic_int64;
19
20 25348869 static void inline __attribute__((used)) atomic_init32(atomic_int32 *a) {
21 25348869 *a = 0;
22 25348869 }
23
24 7340086 static void inline __attribute__((used)) atomic_init64(atomic_int64 *a) {
25 7340086 *a = 0;
26 7340086 }
27
28 1101031065 static int32_t inline __attribute__((used)) atomic_read32(atomic_int32 *a) {
29 1101031065 return __sync_fetch_and_add(a, 0);
30 }
31
32 64618585 static int64_t inline __attribute__((used)) atomic_read64(atomic_int64 *a) {
33 64618585 return __sync_fetch_and_add(a, 0);
34 }
35
36 23804009 static void inline __attribute__((used)) atomic_write32(atomic_int32 *a,
37 int32_t value) {
38
2/2
✓ Branch 1 taken 26999699 times.
✓ Branch 2 taken 26991837 times.
 50803708 while (!__sync_bool_compare_and_swap(a, atomic_read32(a), value)) {
39 }
40 26991837 }
41
42 13709168 static void inline __attribute__((used)) atomic_write64(atomic_int64 *a,
43 int64_t value) {
44
2/2
✓ Branch 1 taken 33423942 times.
✓ Branch 2 taken 17072418 times.
 47133110 while (!__sync_bool_compare_and_swap(a, atomic_read64(a), value)) {
45 }
46 17072418 }
47
48 70173017 static void inline __attribute__((used)) atomic_inc32(atomic_int32 *a) {
49 70173017 (void)__sync_fetch_and_add(a, 1);
50 70173017 }
51
52 211573866 static void inline __attribute__((used)) atomic_inc64(atomic_int64 *a) {
53 211573866 (void)__sync_fetch_and_add(a, 1);
54 211573866 }
55
56 40401732 static void inline __attribute__((used)) atomic_dec32(atomic_int32 *a) {
57 40401732 (void)__sync_fetch_and_sub(a, 1);
58 40401732 }
59
60 10889865 static void inline __attribute__((used)) atomic_dec64(atomic_int64 *a) {
61 10889865 (void)__sync_fetch_and_sub(a, 1);
62 10889865 }
63
64 18076242 static int32_t inline __attribute__((used)) atomic_xadd32(atomic_int32 *a,
65 int32_t offset) {
66
2/2
✓ Branch 0 taken 9174015 times.
✓ Branch 1 taken 8902227 times.
 18076242 if (offset < 0)
67 9174015 return __sync_fetch_and_sub(a, -offset);
68 8902227 return __sync_fetch_and_add(a, offset);
69 }
70
71 97775082 static int64_t inline __attribute__((used)) atomic_xadd64(atomic_int64 *a,
72 int64_t offset) {
73
2/2
✓ Branch 0 taken 23747337 times.
✓ Branch 1 taken 74027745 times.
 97775082 if (offset < 0)
74 23747337 return __sync_fetch_and_sub(a, -offset);
75 74027745 return __sync_fetch_and_add(a, offset);
76 }
77
78 95143 static bool inline __attribute__((used)) atomic_cas32(atomic_int32 *a,
79 int32_t cmp,
80 int32_t newval) {
81 95143 return __sync_bool_compare_and_swap(a, cmp, newval);
82 }
83
84 ✗ static bool inline __attribute__((used)) atomic_cas64(atomic_int64 *a,
85 int64_t cmp,
86 int64_t newval) {
87 // Clang 3.5 has a bug in optimized __sync_bool_compare_and_swap:
88 // https://bugs.llvm.org//show_bug.cgi?format=multiple&id=21499
89 ✗ return __sync_bool_compare_and_swap(a, cmp, newval);
90 }
91
92 564 static void inline __attribute__((used)) MemoryFence() {
93 564 asm __volatile__("" : : : "memory");
94 564 }
95
96 #ifdef CVMFS_NAMESPACE_GUARD
97 } // namespace CVMFS_NAMESPACE_GUARD
98 #endif
99
100 #endif // CVMFS_UTIL_ATOMIC_H_
101