GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/util/atomic.h
Date: 2026-06-28 02:36:10
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 1113341 static void inline __attribute__((used)) atomic_init32(atomic_int32 *a) {
21 1113341 *a = 0;
22 1113341 }
23
24 569641 static void inline __attribute__((used)) atomic_init64(atomic_int64 *a) {
25 569641 *a = 0;
26 569641 }
27
28 1512096420 static int32_t inline __attribute__((used)) atomic_read32(atomic_int32 *a) {
29 1512096420 return __sync_fetch_and_add(a, 0);
30 }
31
32 361728588 static int64_t inline __attribute__((used)) atomic_read64(atomic_int64 *a) {
33 361728588 return __sync_fetch_and_add(a, 0);
34 }
35
36 116151656 static void inline __attribute__((used)) atomic_write32(atomic_int32 *a,
37 int32_t value) {
38
2/2
✓ Branch 1 taken 243518216 times.
✓ Branch 2 taken 144386208 times.
 359669872 while (!__sync_bool_compare_and_swap(a, atomic_read32(a), value)) {
39 }
40 144386208 }
41
42 105865768 static void inline __attribute__((used)) atomic_write64(atomic_int64 *a,
43 int64_t value) {
44
2/2
✓ Branch 1 taken 296323704 times.
✓ Branch 2 taken 137492600 times.
 402189472 while (!__sync_bool_compare_and_swap(a, atomic_read64(a), value)) {
45 }
46 137492600 }
47
48 109962410 static void inline __attribute__((used)) atomic_inc32(atomic_int32 *a) {
49 109962410 (void)__sync_fetch_and_add(a, 1);
50 109962410 }
51
52 105358743 static void inline __attribute__((used)) atomic_inc64(atomic_int64 *a) {
53 105358743 (void)__sync_fetch_and_add(a, 1);
54 105358743 }
55
56 48966686 static void inline __attribute__((used)) atomic_dec32(atomic_int32 *a) {
57 48966686 (void)__sync_fetch_and_sub(a, 1);
58 48966686 }
59
60 30879985 static void inline __attribute__((used)) atomic_dec64(atomic_int64 *a) {
61 30879985 (void)__sync_fetch_and_sub(a, 1);
62 30879985 }
63
64 25616692 static int32_t inline __attribute__((used)) atomic_xadd32(atomic_int32 *a,
65 int32_t offset) {
66
2/2
✓ Branch 0 taken 393424 times.
✓ Branch 1 taken 25223268 times.
 25616692 if (offset < 0)
67 393424 return __sync_fetch_and_sub(a, -offset);
68 25223268 return __sync_fetch_and_add(a, offset);
69 }
70
71 8040267 static int64_t inline __attribute__((used)) atomic_xadd64(atomic_int64 *a,
72 int64_t offset) {
73
2/2
✓ Branch 0 taken 2688785 times.
✓ Branch 1 taken 5351482 times.
 8040267 if (offset < 0)
74 2688785 return __sync_fetch_and_sub(a, -offset);
75 5351482 return __sync_fetch_and_add(a, offset);
76 }
77
78 7281884 static bool inline __attribute__((used)) atomic_cas32(atomic_int32 *a,
79 int32_t cmp,
80 int32_t newval) {
81 7281884 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
92 816 static void inline __attribute__((used)) MemoryFence() {
93 816 asm __volatile__("" : : : "memory");
94 816 }
95
96 #ifdef CVMFS_NAMESPACE_GUARD
97 } // namespace CVMFS_NAMESPACE_GUARD
98 #endif
99
100 #endif // CVMFS_UTIL_ATOMIC_H_
101