File: threaded_flush.c

package info (click to toggle)
swiftlang 6.1.3-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,791,532 kB
  • sloc: cpp: 9,901,743; ansic: 2,201,431; asm: 1,091,827; python: 308,252; objc: 82,166; f90: 80,126; lisp: 38,358; pascal: 25,559; sh: 20,429; ml: 5,058; perl: 4,745; makefile: 4,484; awk: 3,535; javascript: 3,018; xml: 918; fortran: 664; cs: 573; ruby: 396
file content (37 lines) | stat: -rw-r--r-- 1,019 bytes parent folder | download | duplicates (22) 
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
 
// Tests that doing dfsan_flush() while another thread is executing doesn't
// segfault.
// RUN: %clang_dfsan %s -o %t && %run %t

#include <assert.h>
#include <pthread.h>
#include <sanitizer/dfsan_interface.h>
#include <stdlib.h>

static unsigned char GlobalBuf[4096];
static int ShutDownThread;
static int StartFlush;

// Access GlobalBuf continuously, causing its shadow to be touched as well.
// When main() calls dfsan_flush(), no segfault should be triggered.
static void *accessGlobalInBackground(void *Arg) {
  __atomic_store_n(&StartFlush, 1, __ATOMIC_RELEASE);

  while (!__atomic_load_n(&ShutDownThread, __ATOMIC_ACQUIRE))
    for (unsigned I = 0; I < sizeof(GlobalBuf); ++I)
      ++GlobalBuf[I];

  return NULL;
}

int main() {
  pthread_t Thread;
  pthread_create(&Thread, NULL, accessGlobalInBackground, NULL);
  while (!__atomic_load_n(&StartFlush, __ATOMIC_ACQUIRE))
    ; // Spin

  dfsan_flush();

  __atomic_store_n(&ShutDownThread, 1, __ATOMIC_RELEASE);
  pthread_join(Thread, NULL);
  return 0;
}