forked from OSchip/llvm-project
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
// RUN: %clangxx_tsan -O0 %s -o %t
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// RUN: not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-RACE
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// RUN: %run %t ignore 2>&1 | FileCheck %s --check-prefix=CHECK-IGNORE
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#include <sys/mman.h>
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#include <string.h>
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#include <assert.h>
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#include <atomic>
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#include "test.h"
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// Use atomic to ensure we do not have a race for the pointer value itself. We
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// only want to check races in the mmap'd memory to isolate the test that mmap
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// respects ignore annotations.
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std::atomic<int*> global_p;
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void mmap_ignored(bool ignore) {
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const size_t kSize = sysconf(_SC_PAGESIZE);
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if (ignore) AnnotateIgnoreWritesBegin(__FILE__, __LINE__);
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void *p = mmap(0, kSize, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0);
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if (ignore) AnnotateIgnoreWritesEnd(__FILE__, __LINE__);
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// Use relaxed to retain the race between the mmap call and the memory write
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global_p.store((int *)p, std::memory_order_relaxed);
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barrier_wait(&barrier);
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}
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void *WriteToMemory(void *unused) {
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barrier_wait(&barrier);
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global_p[0] = 7;
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return 0;
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}
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// Create race between allocating (mmap) and writing memory
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int main(int argc, const char *argv[]) {
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bool ignore = (argc > 1) && (strcmp(argv[1], "ignore") == 0);
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barrier_init(&barrier, 2);
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pthread_t t;
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pthread_create(&t, 0, WriteToMemory, 0);
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mmap_ignored(ignore);
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pthread_join(t, 0);
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assert(global_p[0] == 7);
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printf("OK\n");
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return 0;
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}
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// CHECK-RACE: WARNING: ThreadSanitizer: data race
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// CHECK-RACE: OK
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// CHECK-IGNORE-NOT: WARNING: ThreadSanitizer: data race
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// CHECK-IGNORE: OK
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