GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/util/atomic.h
Date: 2025-04-20 02:34:28
Exec Total Coverage
Lines: 39 41 95.1%
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 635979 static void inline __attribute__((used)) atomic_init32(atomic_int32 *a) {
21 635979 *a = 0;
22 635979 }
23
24 265159 static void inline __attribute__((used)) atomic_init64(atomic_int64 *a) {
25 265159 *a = 0;
26 265159 }
27
28 64783852 static int32_t inline __attribute__((used)) atomic_read32(atomic_int32 *a) {
29 64783852 return __sync_fetch_and_add(a, 0);
30 }
31
32 40448091 static int64_t inline __attribute__((used)) atomic_read64(atomic_int64 *a) {
33 40448091 return __sync_fetch_and_add(a, 0);
34 }
35
36 static void inline __attribute__((used))
37 14406697 atomic_write32(atomic_int32 *a, int32_t value) {
38
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✓ Branch 1 taken 24674466 times.
✓ Branch 2 taken 17826416 times.
 39081163 while (!__sync_bool_compare_and_swap(a, atomic_read32(a), value)) {
39 }
40 17826416 }
41
42 static void inline __attribute__((used))
43 13763120 atomic_write64(atomic_int64 *a, int64_t value) {
44
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✓ Branch 1 taken 29214535 times.
✓ Branch 2 taken 17049154 times.
 42977655 while (!__sync_bool_compare_and_swap(a, atomic_read64(a), value)) {
45 }
46 17049154 }
47
48 7738520 static void inline __attribute__((used)) atomic_inc32(atomic_int32 *a) {
49 7738520 (void)__sync_fetch_and_add(a, 1);
50 7738520 }
51
52 11460898 static void inline __attribute__((used)) atomic_inc64(atomic_int64 *a) {
53 11460898 (void)__sync_fetch_and_add(a, 1);
54 11460898 }
55
56 5304769 static void inline __attribute__((used)) atomic_dec32(atomic_int32 *a) {
57 5304769 (void)__sync_fetch_and_sub(a, 1);
58 5304769 }
59
60 4468961 static void inline __attribute__((used)) atomic_dec64(atomic_int64 *a) {
61 4468961 (void)__sync_fetch_and_sub(a, 1);
62 4468961 }
63
64 static int32_t inline __attribute__((used))
65 959301 atomic_xadd32(atomic_int32 *a, int32_t offset) {
66
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✓ Branch 0 taken 193678 times.
✓ Branch 1 taken 765623 times.
 959301 if (offset < 0) return __sync_fetch_and_sub(a, -offset);
67 765623 return __sync_fetch_and_add(a, offset);
68 }
69
70 static int64_t inline __attribute__((used))
71 3409386 atomic_xadd64(atomic_int64 *a, int64_t offset) {
72
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✓ Branch 0 taken 804442 times.
✓ Branch 1 taken 2604944 times.
 3409386 if (offset < 0) return __sync_fetch_and_sub(a, -offset);
73 2604944 return __sync_fetch_and_add(a, offset);
74 }
75
76 static bool inline __attribute__((used))
77 147963 atomic_cas32(atomic_int32 *a, int32_t cmp, int32_t newval) {
78 147963 return __sync_bool_compare_and_swap(a, cmp, newval);
79 }
80
81 static bool inline __attribute__((used))
82 ✗ atomic_cas64(atomic_int64 *a, int64_t cmp, int64_t newval) {
83 // Clang 3.5 has a bug in optimized __sync_bool_compare_and_swap:
84 // https://bugs.llvm.org//show_bug.cgi?format=multiple&id=21499
85 ✗ return __sync_bool_compare_and_swap(a, cmp, newval);
86 }
87
88 42 static void inline __attribute__((used)) MemoryFence() {
89 42 asm __volatile__("" : : : "memory");
90 42 }
91
92 #ifdef CVMFS_NAMESPACE_GUARD
93 } // namespace CVMFS_NAMESPACE_GUARD
94 #endif
95
96 #endif // CVMFS_UTIL_ATOMIC_H_
97