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tsan: attempt to reproduce spurious ReportRace contention
For context see: google/sanitizers#1552
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| // RUN: %clangxx_tsan %s -o %t | ||
| // RUN: %run %t 2>&1 | FileCheck %s | ||
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| // bench.h needs pthread barriers which are not available on OS X | ||
| // UNSUPPORTED: darwin | ||
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| #include "bench.h" | ||
| #include <atomic> | ||
| #include <vector> | ||
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| struct Block { | ||
| volatile long data[32 << 10]; | ||
| }; | ||
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| Block* queue; | ||
| std::atomic<long> step; | ||
| std::atomic<long> ref; | ||
| std::atomic<long> fake; | ||
| std::atomic<long> reset[1000]; | ||
| int histogram[64]; | ||
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| void thread(int tid) { | ||
| if (tid == 0) { | ||
| uint64_t start = nanotime(); | ||
| for (int i = 0; i < bench_niter; i++) { | ||
| Block* b = new Block; | ||
| fake++; | ||
| for (auto& data : b->data) | ||
| data = 1; | ||
| while (i != 0 && ref != bench_nthread / 2) | ||
| pthread_yield(); | ||
| Block* prev = queue; | ||
| queue = b; | ||
| ref = 0; | ||
| step++; | ||
| delete prev; | ||
| uint64_t now = nanotime(); | ||
| uint64_t time_ms = (now - start) / 1000000; | ||
| start = now; | ||
| int idx = 0; | ||
| for (;time_ms; time_ms /= 2, idx++) {} | ||
| histogram[idx]++; | ||
| } | ||
| int first = 64, last = 64; | ||
| for (int i = 0; i < 64; i++) { | ||
| if (!histogram[i]) | ||
| continue; | ||
| if (first == 64) | ||
| first = i; | ||
| last = i + 1; | ||
| } | ||
| for (uint64_t ms = 1; first < last; first++, ms *= 2) | ||
| printf("<%-6lums: %d\n", ms, histogram[first]); | ||
| } else if (tid % 2) { | ||
| for (int i = 0; i < bench_niter; i++) { | ||
| while (step != i + 1) | ||
| usleep(10); | ||
| Block* b = queue; | ||
| for (auto data : b->data) { | ||
| if (data != 1) | ||
| exit(1); | ||
| } | ||
| ref++; | ||
| } | ||
| } else { | ||
| while (step < bench_niter) | ||
| reset[(tid / 2) % (sizeof(reset)/sizeof(reset[0]))]++; | ||
| } | ||
| } | ||
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| void bench() { | ||
| start_thread_group(bench_nthread, thread); | ||
| } | ||
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| // CHECK: DONE |