File: barrier_closure.cc

package info (click to toggle)
chromium-browser 57.0.2987.98-1~deb8u1
  • links: PTS, VCS
  • area: main
  • in suites: jessie
  • size: 2,637,852 kB
  • ctags: 2,544,394
  • sloc: cpp: 12,815,961; ansic: 3,676,222; python: 1,147,112; asm: 526,608; java: 523,212; xml: 286,794; perl: 92,654; sh: 86,408; objc: 73,271; makefile: 27,698; cs: 18,487; yacc: 13,031; tcl: 12,957; pascal: 4,875; ml: 4,716; lex: 3,904; sql: 3,862; ruby: 1,982; lisp: 1,508; php: 1,368; exp: 404; awk: 325; csh: 117; jsp: 39; sed: 37
file content (53 lines) | stat: -rw-r--r-- 1,350 bytes parent folder | download | duplicates (2) 
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
 
// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/barrier_closure.h"

#include "base/atomic_ref_count.h"
#include "base/bind.h"

namespace {

// Maintains state for a BarrierClosure.
class BarrierInfo {
 public:
  BarrierInfo(int num_callbacks_left, const base::Closure& done_closure);
  void Run();

 private:
  base::AtomicRefCount num_callbacks_left_;
  base::Closure done_closure_;
};

BarrierInfo::BarrierInfo(int num_callbacks, const base::Closure& done_closure)
    : num_callbacks_left_(num_callbacks),
      done_closure_(done_closure) {
}

void BarrierInfo::Run() {
  DCHECK(!base::AtomicRefCountIsZero(&num_callbacks_left_));
  if (!base::AtomicRefCountDec(&num_callbacks_left_)) {
    base::Closure done_closure = done_closure_;
    done_closure_.Reset();
    done_closure.Run();
  }
}

}  // namespace

namespace base {

base::Closure BarrierClosure(int num_callbacks_left,
                             const base::Closure& done_closure) {
  DCHECK_GE(num_callbacks_left, 0);

  if (num_callbacks_left == 0)
    done_closure.Run();

  return base::Bind(&BarrierInfo::Run,
                    base::Owned(
                        new BarrierInfo(num_callbacks_left, done_closure)));
}

}  // namespace base