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Detailed gem5 analysis of how data races happen

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And pass niters as a thread argument to all threading implementations...
otherwise every loop has to do a memory load from the global!
This commit is contained in:
Ciro Santilli 六四事件 法轮功
2020-06-05 06:00:05 +00:00
parent 619fef4b04
commit 0d5c7f5c4c
6 changed files with 162 additions and 19 deletions
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8
userland/cpp/atomic/main.hpp
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@@ -8,8 +8,6 @@
#include <thread>
#include <vector>
size_t niters;
#if LKMC_USERLAND_ATOMIC_STD_ATOMIC
std::atomic_ulong global(0);
#else
@@ -20,7 +18,7 @@ uint64_t global = 0;
std::mutex mutex;
#endif
void threadMain() {
void threadMain(size_t niters) {
for (size_t i = 0; i < niters; ++i) {
#if LKMC_USERLAND_ATOMIC_MUTEX
mutex.lock();
@@ -97,7 +95,7 @@ void threadMain() {
int main(int argc, char **argv) {
#if __cplusplus >= 201103L
size_t nthreads;
size_t niters, nthreads;
if (argc > 1) {
nthreads = std::stoull(argv[1], NULL, 0);
} else {
@@ -110,7 +108,7 @@ int main(int argc, char **argv) {
}
std::vector<std::thread> threads(nthreads);
for (size_t i = 0; i < nthreads; ++i)
threads[i] = std::thread(threadMain);
threads[i] = std::thread(threadMain, niters);
for (size_t i = 0; i < nthreads; ++i)
threads[i].join();
uint64_t expect = nthreads * niters;