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author | johannst <johannst@users.noreply.github.com> | 2024-01-23 01:39:29 +0000 |
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committer | johannst <johannst@users.noreply.github.com> | 2024-01-23 01:39:29 +0000 |
commit | 6dbf014773f5f8ac0b0e291392dfde518de94daf (patch) | |
tree | f48b103633621acc4c4d6b272fd67f3d86cc2ae2 /trace_profile/callgrind/cg_example.cc | |
parent | c4fdf1c5f2c9ebedd0dedba4449c015f98aecda5 (diff) | |
download | notes-6dbf014773f5f8ac0b0e291392dfde518de94daf.tar.gz notes-6dbf014773f5f8ac0b0e291392dfde518de94daf.zip |
deploy: 8c9fd06e839c06717dd2dcb067371a5e1fc71801
Diffstat (limited to 'trace_profile/callgrind/cg_example.cc')
-rw-r--r-- | trace_profile/callgrind/cg_example.cc | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/trace_profile/callgrind/cg_example.cc b/trace_profile/callgrind/cg_example.cc new file mode 100644 index 0000000..d143790 --- /dev/null +++ b/trace_profile/callgrind/cg_example.cc @@ -0,0 +1,36 @@ +#include <cstdio> +#include <thread> + +#include <valgrind/callgrind.h> + +struct cnt { + volatile int a; + volatile int b; +}; + +void inc_a(cnt &c) { c.a++; } +void inc_b(cnt &c) { c.b++; } + +int main() { + cnt C{0, 0}; + + CALLGRIND_START_INSTRUMENTATION; + + std::thread T1([&C]() { + for (int i = 0; i < 20000000; ++i) { + inc_a(C); + } + }); + std::thread T2([&C]() { + for (int i = 0; i < 10000000; ++i) { + inc_b(C); + } + }); + T1.join(); + T2.join(); + + CALLGRIND_STOP_INSTRUMENTATION; + + printf("%d %d\n", C.a, C.b); + return 0; +} |