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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; (void)tmp;
foo1();
}
void __attribute__((noinline)) foo2() {
volatile int v = Global; (void)v;
}
void __attribute__((noinline)) bar2() {
volatile int tmp = 42; (void)tmp;
foo2();
}
void *Thread1(void *x) {
usleep(1000000);
bar1();
return NULL;
}
void *Thread2(void *x) {
bar2();
return NULL;
}
void StartThread(pthread_t *t, void *(*f)(void*)) {
pthread_create(t, NULL, f, NULL);
}
int main() {
pthread_t t[2];
StartThread(&t[0], Thread1);
StartThread(&t[1], Thread2);
pthread_join(t[0], NULL);
pthread_join(t[1], NULL);
return 0;
}
// CHECK: WARNING: ThreadSanitizer: data race
// CHECK-NEXT: Write of size 4 at {{.*}} by thread 1:
// CHECK-NEXT: #0 foo1 {{.*}}simple_stack.c:8{{(:3)?}} ({{.*}})
// CHECK-NEXT: #1 bar1 {{.*}}simple_stack.c:13{{(:3)?}} ({{.*}})
// CHECK-NEXT: #2 Thread1 {{.*}}simple_stack.c:27{{(:3)?}} ({{.*}})
// CHECK-NEXT: Previous read of size 4 at {{.*}} by thread 2:
// CHECK-NEXT: #0 foo2 {{.*}}simple_stack.c:17{{(:26)?}} ({{.*}})
// CHECK-NEXT: #1 bar2 {{.*}}simple_stack.c:22{{(:3)?}} ({{.*}})
// CHECK-NEXT: #2 Thread2 {{.*}}simple_stack.c:32{{(:3)?}} ({{.*}})
// CHECK-NEXT: Thread 1 (running) created at:
// CHECK-NEXT: #0 pthread_create {{.*}} ({{.*}})
// CHECK-NEXT: #1 StartThread {{.*}}simple_stack.c:37{{(:3)?}} ({{.*}})
// CHECK-NEXT: #2 main {{.*}}simple_stack.c:42{{(:3)?}} ({{.*}})
// CHECK-NEXT: Thread 2 ({{.*}}) created at:
// CHECK-NEXT: #0 pthread_create {{.*}} ({{.*}})
// CHECK-NEXT: #1 StartThread {{.*}}simple_stack.c:37{{(:3)?}} ({{.*}})
// CHECK-NEXT: #2 main {{.*}}simple_stack.c:43{{(:3)?}} ({{.*}})
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