GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/util/atomic.h
Date: 2025-11-09 02:35:23
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 13128312 static void inline __attribute__((used)) atomic_init32(atomic_int32 *a) {
21 13128312 *a = 0;
22 13128312 }
23
24 7595684 static void inline __attribute__((used)) atomic_init64(atomic_int64 *a) {
25 7595684 *a = 0;
26 7595684 }
27
28 864656435 static int32_t inline __attribute__((used)) atomic_read32(atomic_int32 *a) {
29 864656435 return __sync_fetch_and_add(a, 0);
30 }
31
32 311304816 static int64_t inline __attribute__((used)) atomic_read64(atomic_int64 *a) {
33 311304816 return __sync_fetch_and_add(a, 0);
34 }
35
36 103805018 static void inline __attribute__((used)) atomic_write32(atomic_int32 *a,
37 int32_t value) {
38
2/2
✓ Branch 1 taken 219239692 times.
✓ Branch 2 taken 127933150 times.
 323044710 while (!__sync_bool_compare_and_swap(a, atomic_read32(a), value)) {
39 }
40 127933150 }
41
42 97235496 static void inline __attribute__((used)) atomic_write64(atomic_int64 *a,
43 int64_t value) {
44
2/2
✓ Branch 1 taken 225803200 times.
✓ Branch 2 taken 119625731 times.
 323038696 while (!__sync_bool_compare_and_swap(a, atomic_read64(a), value)) {
45 }
46 119625731 }
47
48 83969263 static void inline __attribute__((used)) atomic_inc32(atomic_int32 *a) {
49 83969263 (void)__sync_fetch_and_add(a, 1);
50 83969263 }
51
52 147531595 static void inline __attribute__((used)) atomic_inc64(atomic_int64 *a) {
53 147531595 (void)__sync_fetch_and_add(a, 1);
54 147531595 }
55
56 42472894 static void inline __attribute__((used)) atomic_dec32(atomic_int32 *a) {
57 42472894 (void)__sync_fetch_and_sub(a, 1);
58 42472894 }
59
60 33909321 static void inline __attribute__((used)) atomic_dec64(atomic_int64 *a) {
61 33909321 (void)__sync_fetch_and_sub(a, 1);
62 33909321 }
63
64 16520116 static int32_t inline __attribute__((used)) atomic_xadd32(atomic_int32 *a,
65 int32_t offset) {
66
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✓ Branch 0 taken 2956564 times.
✓ Branch 1 taken 13563552 times.
 16520116 if (offset < 0)
67 2956564 return __sync_fetch_and_sub(a, -offset);
68 13563552 return __sync_fetch_and_add(a, offset);
69 }
70
71 96938446 static int64_t inline __attribute__((used)) atomic_xadd64(atomic_int64 *a,
72 int64_t offset) {
73
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✓ Branch 0 taken 22766769 times.
✓ Branch 1 taken 74171677 times.
 96938446 if (offset < 0)
74 22766769 return __sync_fetch_and_sub(a, -offset);
75 74171677 return __sync_fetch_and_add(a, offset);
76 }
77
78 1251409 static bool inline __attribute__((used)) atomic_cas32(atomic_int32 *a,
79 int32_t cmp,
80 int32_t newval) {
81 1251409 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
92 420 static void inline __attribute__((used)) MemoryFence() {
93 420 asm __volatile__("" : : : "memory");
94 420 }
95
96 #ifdef CVMFS_NAMESPACE_GUARD
97 } // namespace CVMFS_NAMESPACE_GUARD
98 #endif
99
100 #endif // CVMFS_UTIL_ATOMIC_H_
101