File: S%2Bfencewmbonceonce%2Bpoacquireonce.litmus

package info (click to toggle)
linux 6.1.8-1
  • links: PTS, VCS
  • area: main
  • in suites: bookworm
  • size: 1,488,076 kB
  • sloc: ansic: 23,401,844; asm: 266,744; sh: 108,976; makefile: 49,705; python: 36,927; perl: 36,810; cpp: 6,044; yacc: 4,904; lex: 2,722; awk: 1,440; ruby: 25; sed: 5
file content (27 lines) | stat: -rw-r--r-- 356 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
 
C S+fencewmbonceonce+poacquireonce

(*
 * Result: Never
 *
 * Can a smp_wmb(), instead of a release, and an acquire order a prior
 * store against a subsequent store?
 *)

{}

P0(int *x, int *y)
{
	WRITE_ONCE(*x, 2);
	smp_wmb();
	WRITE_ONCE(*y, 1);
}

P1(int *x, int *y)
{
	int r0;

	r0 = smp_load_acquire(y);
	WRITE_ONCE(*x, 1);
}

exists (x=2 /\ 1:r0=1)