File: inlined_memcpy_race.cpp

package info (click to toggle)
llvm-toolchain-15 1%3A15.0.6-4
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,554,644 kB
  • sloc: cpp: 5,922,452; ansic: 1,012,136; asm: 674,362; python: 191,568; objc: 73,855; f90: 42,327; lisp: 31,913; pascal: 11,973; javascript: 10,144; sh: 9,421; perl: 7,447; ml: 5,527; awk: 3,523; makefile: 2,520; xml: 885; cs: 573; fortran: 567
file content (36 lines) | stat: -rw-r--r-- 828 bytes parent folder | download | duplicates (8) 
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
 
// RUN: %clangxx_tsan -O1 %s -o %t && %deflake %run %t 2>&1 | FileCheck %s
#include "test.h"
#include <string.h>

int x[4], z[4];

void *MemCpyThread(void *a) {
  memcpy((int*)a, z, 16);
  barrier_wait(&barrier);
  return NULL;
}

void *MemSetThread(void *a) {
  barrier_wait(&barrier);
  memset((int*)a, 0, 16);
  return NULL;
}

int main() {
  barrier_init(&barrier, 2);
  pthread_t t[2];
  // Race on x between memcpy and memset
  pthread_create(&t[0], NULL, MemCpyThread, x);
  pthread_create(&t[1], NULL, MemSetThread, x);
  pthread_join(t[0], NULL);
  pthread_join(t[1], NULL);
  fprintf(stderr, "PASS\n");
  return 0;
}

// CHECK: WARNING: ThreadSanitizer: data race
// CHECK:   #0 memset
// CHECK:   #{{[12]}} MemSetThread
// CHECK:  Previous write
// CHECK:   #0 {{(memcpy|memmove)}}
// CHECK:   #{{[12]}} MemCpyThread