312ad250ff
If a memory access is unaligned, emit __tsan_unaligned_read/write callbacks instead of __tsan_read/write. Required to change semantics of __tsan_unaligned_read/write to not do the user memory. But since they were unused (other than through __sanitizer_unaligned_load/store) this is fine. Fixes long standing issue 17: https://code.google.com/p/thread-sanitizer/issues/detail?id=17 llvm-svn: 227230
36 lines
881 B
C++
36 lines
881 B
C++
// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
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// Race between an aligned access and an unaligned access, which
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// touches the same memory region.
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#include "test.h"
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#include <stdint.h>
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uint64_t Global[2];
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void *Thread1(void *x) {
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Global[1]++;
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barrier_wait(&barrier);
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return NULL;
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}
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void *Thread2(void *x) {
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barrier_wait(&barrier);
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char *p1 = reinterpret_cast<char *>(&Global[0]);
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struct __attribute__((packed, aligned(1))) u_uint64_t { uint64_t val; };
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u_uint64_t *p4 = reinterpret_cast<u_uint64_t *>(p1 + 1);
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(*p4).val++;
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return NULL;
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}
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int main() {
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barrier_init(&barrier, 2);
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pthread_t t[2];
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pthread_create(&t[0], NULL, Thread1, NULL);
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pthread_create(&t[1], NULL, Thread2, NULL);
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pthread_join(t[0], NULL);
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pthread_join(t[1], NULL);
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printf("Pass\n");
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// CHECK: ThreadSanitizer: data race
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// CHECK: Pass
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return 0;
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}
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