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62 lines
1.6 KiB
62 lines
1.6 KiB
4 months ago
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// RUN: %clangxx_tsan -O0 %s -o %t
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// RUN: not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-NORMAL
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// RUN: %env_tsan_opts=ignore_interceptors_accesses=1 %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-IGNORE
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#include <errno.h>
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#include <sys/mman.h>
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#include "test.h"
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extern "C" {
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void AnnotateIgnoreReadsBegin(const char *f, int l);
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void AnnotateIgnoreReadsEnd(const char *f, int l);
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void AnnotateIgnoreWritesBegin(const char *f, int l);
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void AnnotateIgnoreWritesEnd(const char *f, int l);
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}
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void *global_p;
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int mmap_and_ignore_reads_and_writes() {
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const size_t kSize = sysconf(_SC_PAGESIZE);
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void *p = mmap(0, kSize, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_ANON, -1, 0);
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if (p == MAP_FAILED)
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return printf("mmap failed with %d\n", errno);
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munmap(p, kSize);
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void *new_p = mmap(p, kSize, PROT_READ|PROT_WRITE,
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MAP_PRIVATE|MAP_ANON, -1, 0);
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if (p == MAP_FAILED || p != new_p)
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return printf("second mmap failed with %d\n", errno);
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AnnotateIgnoreWritesBegin(__FILE__, __LINE__);
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global_p = p;
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AnnotateIgnoreWritesEnd(__FILE__, __LINE__);
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barrier_wait(&barrier);
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return 0;
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}
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void *Thread(void *a) {
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barrier_wait(&barrier);
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((int*)global_p)[1] = 10;
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printf("Read the zero value from mmapped memory %d\n", ((int*)global_p)[1]);
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return 0;
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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;
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pthread_create(&t, 0, Thread, 0);
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if (mmap_and_ignore_reads_and_writes())
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return 1;
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pthread_join(t, 0);
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printf("OK\n");
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return 0;
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}
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// CHECK-NORMAL: WARNING: ThreadSanitizer: data race
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// CHECK-NORMAL: OK
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// CHECK-IGNORE_NOT: WARNING: ThreadSanitizer: data race
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// CHECK-IGNORE: OK
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