File: reentrant.c

package info (click to toggle)
gcc-avr 1%3A5.4.0%2BAtmel3.6.1-2
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 589,832 kB
  • sloc: ansic: 2,775,567; ada: 756,757; cpp: 723,977; f90: 117,673; asm: 66,896; makefile: 62,755; xml: 44,466; sh: 29,549; exp: 23,315; objc: 15,216; fortran: 10,901; pascal: 4,185; python: 4,093; perl: 2,969; awk: 2,811; ml: 2,385; cs: 879; yacc: 316; lex: 198; haskell: 112; lisp: 8
file content (67 lines) | stat: -rw-r--r-- 1,264 bytes parent folder | download | duplicates (10)
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
/* { dg-do run } */
/* { dg-options "-pthread" } */

/* Tests that new transactions can be started from both transaction_pure and
   transaction_unsafe code. This also requires proper handling of reentrant
   nesting in the serial_lock implementation. */

#include <stdlib.h>
#include <pthread.h>
#include <libitm.h>

int x = 0;

int __attribute__((transaction_pure)) pure(int i)
{
  __transaction_atomic {
    x++;
  }
  if (_ITM_inTransaction() == outsideTransaction)
    abort();
  return i+1;
}

int __attribute__((transaction_unsafe)) unsafe(int i)
{
  if (_ITM_inTransaction() != inIrrevocableTransaction)
    abort();
  __transaction_atomic {
    x++;
  }
  if (_ITM_inTransaction() != inIrrevocableTransaction)
    abort();
  return i+1;
}

static void *thread (void *dummy __attribute__((unused)))
{
  __transaction_atomic {
    pure(x);
  }
  __transaction_relaxed {
    unsafe(1);
  }
  return 0;
}

int main()
{
  pthread_t pt;
  int r = 0;

  __transaction_atomic {
    r += pure(1) + x;
  }
  __transaction_relaxed {
    r += unsafe(1) + x;
  }
  if (r != 7)
    abort();

  // Spawn a new thread to check that the serial lock is not held.
  pthread_create(&pt, NULL, thread, NULL);
  pthread_join(pt, NULL);
  if (x != 4)
    abort();
  return 0;
}