GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/util/atomic.h
Date: 2026-08-09 02:40:25
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 16165932 static void inline __attribute__((used)) atomic_init32(atomic_int32 *a) {
21 16165932 *a = 0;
22 16165932 }
23
24 10256299 static void inline __attribute__((used)) atomic_init64(atomic_int64 *a) {
25 10256299 *a = 0;
26 10256299 }
27
28 1143555905 static int32_t inline __attribute__((used)) atomic_read32(atomic_int32 *a) {
29 1143555905 return __sync_fetch_and_add(a, 0);
30 }
31
32 646308379 static int64_t inline __attribute__((used)) atomic_read64(atomic_int64 *a) {
33 646308379 return __sync_fetch_and_add(a, 0);
34 }
35
36 216563125 static void inline __attribute__((used)) atomic_write32(atomic_int32 *a,
37 int32_t value) {
38
2/2
✓ Branch 1 taken 596110800 times.
✓ Branch 2 taken 278662949 times.
 812673925 while (!__sync_bool_compare_and_swap(a, atomic_read32(a), value)) {
39 }
40 278662949 }
41
42 225778466 static void inline __attribute__((used)) atomic_write64(atomic_int64 *a,
43 int64_t value) {
44
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✓ Branch 1 taken 404554736 times.
✓ Branch 2 taken 285383490 times.
 630333202 while (!__sync_bool_compare_and_swap(a, atomic_read64(a), value)) {
45 }
46 285383490 }
47
48 164499472 static void inline __attribute__((used)) atomic_inc32(atomic_int32 *a) {
49 164499472 (void)__sync_fetch_and_add(a, 1);
50 164499472 }
51
52 243772377 static void inline __attribute__((used)) atomic_inc64(atomic_int64 *a) {
53 243772377 (void)__sync_fetch_and_add(a, 1);
54 243772377 }
55
56 84585888 static void inline __attribute__((used)) atomic_dec32(atomic_int32 *a) {
57 84585888 (void)__sync_fetch_and_sub(a, 1);
58 84585888 }
59
60 76111120 static void inline __attribute__((used)) atomic_dec64(atomic_int64 *a) {
61 76111120 (void)__sync_fetch_and_sub(a, 1);
62 76111120 }
63
64 22114090 static int32_t inline __attribute__((used)) atomic_xadd32(atomic_int32 *a,
65 int32_t offset) {
66
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✓ Branch 0 taken 3281813 times.
✓ Branch 1 taken 18832277 times.
 22114090 if (offset < 0)
67 3281813 return __sync_fetch_and_sub(a, -offset);
68 18832277 return __sync_fetch_and_add(a, offset);
69 }
70
71 134675834 static int64_t inline __attribute__((used)) atomic_xadd64(atomic_int64 *a,
72 int64_t offset) {
73
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✓ Branch 0 taken 31641673 times.
✓ Branch 1 taken 103034161 times.
 134675834 if (offset < 0)
74 31641673 return __sync_fetch_and_sub(a, -offset);
75 103034161 return __sync_fetch_and_add(a, offset);
76 }
77
78 2342812 static bool inline __attribute__((used)) atomic_cas32(atomic_int32 *a,
79 int32_t cmp,
80 int32_t newval) {
81 2342812 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
92 330 static void inline __attribute__((used)) MemoryFence() {
93 330 asm __volatile__("" : : : "memory");
94 330 }
95
96 #ifdef CVMFS_NAMESPACE_GUARD
97 } // namespace CVMFS_NAMESPACE_GUARD
98 #endif
99
100 #endif // CVMFS_UTIL_ATOMIC_H_
101