1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
// Test that mach_vm_[de]allocate resets shadow memory status.
//
// RUN: %clang_tsan %s -o %t
// RUN: %run %t 2>&1 | FileCheck %s --implicit-check-not='ThreadSanitizer'
#include <mach/mach.h>
#include <mach/mach_vm.h>
#include <pthread.h>
#include <assert.h>
#include <stdio.h>
#include "../test.h"
static int *global_ptr;
const mach_vm_size_t alloc_size = sizeof(int);
static int *alloc() {
mach_vm_address_t addr;
kern_return_t res =
mach_vm_allocate(mach_task_self(), &addr, alloc_size, VM_FLAGS_ANYWHERE);
assert(res == KERN_SUCCESS);
return (int *)addr;
}
static void alloc_fixed(int *ptr) {
mach_vm_address_t addr = (mach_vm_address_t)ptr;
kern_return_t res =
mach_vm_allocate(mach_task_self(), &addr, alloc_size, VM_FLAGS_FIXED);
assert(res == KERN_SUCCESS);
}
static void dealloc(int *ptr) {
kern_return_t res =
mach_vm_deallocate(mach_task_self(), (mach_vm_address_t)ptr, alloc_size);
assert(res == KERN_SUCCESS);
}
static void *Thread(void *arg) {
*global_ptr = 7; // Assignment 1
// We want to test that TSan does not report a race between the two
// assignments to global_ptr when memory is re-allocated here. The calls to
// the API itself are racy though, so ignore them.
AnnotateIgnoreWritesBegin(__FILE__, __LINE__);
dealloc(global_ptr);
alloc_fixed(global_ptr);
AnnotateIgnoreWritesEnd(__FILE__, __LINE__);
barrier_wait(&barrier);
return NULL;;
}
int main(int argc, const char *argv[]) {
barrier_init(&barrier, 2);
global_ptr = alloc();
pthread_t t;
pthread_create(&t, NULL, Thread, NULL);
barrier_wait(&barrier);
*global_ptr = 8; // Assignment 2
pthread_join(t, NULL);
dealloc(global_ptr);
printf("Done.\n");
return 0;
}
// CHECK: Done.
|
