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#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
int Global;
void __attribute__((noinline)) foo1() {
Global = 42;
}
void __attribute__((noinline)) bar1() {
volatile int tmp = 42; int tmp2 = tmp; (void)tmp2;
foo1();
}
void __attribute__((noinline)) foo2() {
volatile int v = Global; int v2 = v; (void)v2;
}
void __attribute__((noinline)) bar2() {
volatile int tmp = 42; int tmp2 = tmp; (void)tmp2;
foo2();
}
void *Thread1(void *x) {
usleep(1000000);
bar1();
return NULL;
}
int main() {
pthread_t t;
pthread_create(&t, NULL, Thread1, NULL);
bar2();
pthread_join(t, NULL);
}
// CHECK: WARNING: ThreadSanitizer: data race
// CHECK-NEXT: Write of size 4 at {{.*}} by thread 1:
// CHECK-NEXT: #0 foo1() {{.*}}simple_stack2.cc:8 ({{.*}})
// CHECK-NEXT: #1 bar1() {{.*}}simple_stack2.cc:13 ({{.*}})
// CHECK-NEXT: #2 Thread1(void*) {{.*}}simple_stack2.cc:27 ({{.*}})
// CHECK-NEXT: Previous read of size 4 at {{.*}} by main thread:
// CHECK-NEXT: #0 foo2() {{.*}}simple_stack2.cc:17 ({{.*}})
// CHECK-NEXT: #1 bar2() {{.*}}simple_stack2.cc:22 ({{.*}})
// CHECK-NEXT: #2 main {{.*}}simple_stack2.cc:34 ({{.*}})
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