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