GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/util/atomic.h
Date: 2025-05-11 02:35:43
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 72676947 static int32_t inline __attribute__((used)) atomic_read32(atomic_int32 *a) {
29 72676947 return __sync_fetch_and_add(a, 0);
30 }
31
32 40499110 static int64_t inline __attribute__((used)) atomic_read64(atomic_int64 *a) {
33 40499110 return __sync_fetch_and_add(a, 0);
34 }
35
36 static void inline __attribute__((used))
37 13530746 atomic_write32(atomic_int32 *a, int32_t value) {
38
2/2
✓ Branch 1 taken 38361233 times.
✓ Branch 2 taken 17409494 times.
 51891979 while (!__sync_bool_compare_and_swap(a, atomic_read32(a), value)) {
39 }
40 17409494 }
41
42 static void inline __attribute__((used))
43 14480916 atomic_write64(atomic_int64 *a, int64_t value) {
44
2/2
✓ Branch 1 taken 26233333 times.
✓ Branch 2 taken 17863036 times.
 40714249 while (!__sync_bool_compare_and_swap(a, atomic_read64(a), value)) {
45 }
46 17863036 }
47
48 7774642 static void inline __attribute__((used)) atomic_inc32(atomic_int32 *a) {
49 7774642 (void)__sync_fetch_and_add(a, 1);
50 7774642 }
51
52 11942810 static void inline __attribute__((used)) atomic_inc64(atomic_int64 *a) {
53 11942810 (void)__sync_fetch_and_add(a, 1);
54 11942810 }
55
56 4900122 static void inline __attribute__((used)) atomic_dec32(atomic_int32 *a) {
57 4900122 (void)__sync_fetch_and_sub(a, 1);
58 4900122 }
59
60 4098003 static void inline __attribute__((used)) atomic_dec64(atomic_int64 *a) {
61 4098003 (void)__sync_fetch_and_sub(a, 1);
62 4098003 }
63
64 static int32_t inline __attribute__((used))
65 931497 atomic_xadd32(atomic_int32 *a, int32_t offset) {
66
2/2
✓ Branch 0 taken 193681 times.
✓ Branch 1 taken 737816 times.
 931497 if (offset < 0) return __sync_fetch_and_sub(a, -offset);
67 737816 return __sync_fetch_and_add(a, offset);
68 }
69
70 static int64_t inline __attribute__((used))
71 3394342 atomic_xadd64(atomic_int64 *a, int64_t offset) {
72
2/2
✓ Branch 0 taken 804321 times.
✓ Branch 1 taken 2590021 times.
 3394342 if (offset < 0) return __sync_fetch_and_sub(a, -offset);
73 2590021 return __sync_fetch_and_add(a, offset);
74 }
75
76 static bool inline __attribute__((used))
77 118017 atomic_cas32(atomic_int32 *a, int32_t cmp, int32_t newval) {
78 118017 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