GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/util/atomic.h
Date: 2026-10-25 02:40:14
Exec Total Coverage
Lines: 38 42 90.5%
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
20 306 static void inline __attribute__((used)) atomic_init32(atomic_int32 *a) {
21 306 *a = 0;
22 306 }
23
24 306 static void inline __attribute__((used)) atomic_init64(atomic_int64 *a) {
25 306 *a = 0;
26 306 }
27
28 1463249636 static int32_t inline __attribute__((used)) atomic_read32(atomic_int32 *a) {
29 1463249636 return __sync_fetch_and_add(a, 0);
30 }
31
32 1654827906 static int64_t inline __attribute__((used)) atomic_read64(atomic_int64 *a) {
33 1654827906 return __sync_fetch_and_add(a, 0);
34 }
35
36 597097698 static void inline __attribute__((used)) atomic_write32(atomic_int32 *a,
37 int32_t value) {
38
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✓ Branch 1 taken 1803230188 times.
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 2400327886 while (!__sync_bool_compare_and_swap(a, atomic_read32(a), value)) {
39 }
40 631433380 }
41
42 505186348 static void inline __attribute__((used)) atomic_write64(atomic_int64 *a,
43 int64_t value) {
44
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✓ Branch 1 taken 1332429604 times.
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 1837615952 while (!__sync_bool_compare_and_swap(a, atomic_read64(a), value)) {
45 }
46 613454690 }
47
48 163827810 static void inline __attribute__((used)) atomic_inc32(atomic_int32 *a) {
49 163827810 (void)__sync_fetch_and_add(a, 1);
50 163827810 }
51
52 172751586 static void inline __attribute__((used)) atomic_inc64(atomic_int64 *a) {
53 172751586 (void)__sync_fetch_and_add(a, 1);
54 172751586 }
55
56 139587238 static void inline __attribute__((used)) atomic_dec32(atomic_int32 *a) {
57 139587238 (void)__sync_fetch_and_sub(a, 1);
58 139587238 }
59
60 146585628 static void inline __attribute__((used)) atomic_dec64(atomic_int64 *a) {
61 146585628 (void)__sync_fetch_and_sub(a, 1);
62 146585628 }
63
64 170 static int32_t inline __attribute__((used)) atomic_xadd32(atomic_int32 *a,
65 int32_t offset) {
66
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✓ Branch 0 taken 34 times.
✓ Branch 1 taken 136 times.
 170 if (offset < 0)
67 34 return __sync_fetch_and_sub(a, -offset);
68 136 return __sync_fetch_and_add(a, offset);
69 }
70
71 136 static int64_t inline __attribute__((used)) atomic_xadd64(atomic_int64 *a,
72 int64_t offset) {
73
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✓ Branch 0 taken 34 times.
✓ Branch 1 taken 102 times.
 136 if (offset < 0)
74 34 return __sync_fetch_and_sub(a, -offset);
75 102 return __sync_fetch_and_add(a, offset);
76 }
77
78 102 static bool inline __attribute__((used)) atomic_cas32(atomic_int32 *a,
79 int32_t cmp,
80 int32_t newval) {
81 102 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 ✗ static void inline __attribute__((used)) MemoryFence() {
93 ✗ asm __volatile__("" : : : "memory");
94 }
95
96 #ifdef CVMFS_NAMESPACE_GUARD
97 } // namespace CVMFS_NAMESPACE_GUARD
98 #endif
99
100 #endif // CVMFS_UTIL_ATOMIC_H_
101