GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/util/atomic.h
Date: 2026-05-24 02:35:55
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 6685054 static void inline __attribute__((used)) atomic_init32(atomic_int32 *a) {
21 6685054 *a = 0;
22 6685054 }
23
24 2827635 static void inline __attribute__((used)) atomic_init64(atomic_int64 *a) {
25 2827635 *a = 0;
26 2827635 }
27
28 887416383 static int32_t inline __attribute__((used)) atomic_read32(atomic_int32 *a) {
29 887416383 return __sync_fetch_and_add(a, 0);
30 }
31
32 426834227 static int64_t inline __attribute__((used)) atomic_read64(atomic_int64 *a) {
33 426834227 return __sync_fetch_and_add(a, 0);
34 }
35
36 147623516 static void inline __attribute__((used)) atomic_write32(atomic_int32 *a,
37 int32_t value) {
38
2/2
✓ Branch 1 taken 277747660 times.
✓ Branch 2 taken 179664756 times.
 425371176 while (!__sync_bool_compare_and_swap(a, atomic_read32(a), value)) {
39 }
40 179664756 }
41
42 139486605 static void inline __attribute__((used)) atomic_write64(atomic_int64 *a,
43 int64_t value) {
44
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✓ Branch 1 taken 318112780 times.
✓ Branch 2 taken 172544705 times.
 457599385 while (!__sync_bool_compare_and_swap(a, atomic_read64(a), value)) {
45 }
46 172544705 }
47
48 128834485 static void inline __attribute__((used)) atomic_inc32(atomic_int32 *a) {
49 128834485 (void)__sync_fetch_and_add(a, 1);
50 128834485 }
51
52 169874089 static void inline __attribute__((used)) atomic_inc64(atomic_int64 *a) {
53 169874089 (void)__sync_fetch_and_add(a, 1);
54 169874089 }
55
56 63054358 static void inline __attribute__((used)) atomic_dec32(atomic_int32 *a) {
57 63054358 (void)__sync_fetch_and_sub(a, 1);
58 63054358 }
59
60 40048808 static void inline __attribute__((used)) atomic_dec64(atomic_int64 *a) {
61 40048808 (void)__sync_fetch_and_sub(a, 1);
62 40048808 }
63
64 28235224 static int32_t inline __attribute__((used)) atomic_xadd32(atomic_int32 *a,
65 int32_t offset) {
66
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✓ Branch 0 taken 2073358 times.
✓ Branch 1 taken 26161866 times.
 28235224 if (offset < 0)
67 2073358 return __sync_fetch_and_sub(a, -offset);
68 26161866 return __sync_fetch_and_add(a, offset);
69 }
70
71 34362644 static int64_t inline __attribute__((used)) atomic_xadd64(atomic_int64 *a,
72 int64_t offset) {
73
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✓ Branch 0 taken 8206235 times.
✓ Branch 1 taken 26156409 times.
 34362644 if (offset < 0)
74 8206235 return __sync_fetch_and_sub(a, -offset);
75 26156409 return __sync_fetch_and_add(a, offset);
76 }
77
78 6557088 static bool inline __attribute__((used)) atomic_cas32(atomic_int32 *a,
79 int32_t cmp,
80 int32_t newval) {
81 6557088 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
92 492 static void inline __attribute__((used)) MemoryFence() {
93 492 asm __volatile__("" : : : "memory");
94 492 }
95
96 #ifdef CVMFS_NAMESPACE_GUARD
97 } // namespace CVMFS_NAMESPACE_GUARD
98 #endif
99
100 #endif // CVMFS_UTIL_ATOMIC_H_
101