Newer
Older
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
####################################################################################################
#
# Patro - A Python library to make patterns for fashion design
# Copyright (C) 2018 Fabrice Salvaire
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
####################################################################################################
__all__ = ['AtomicCounter']
####################################################################################################
import threading
####################################################################################################
class AtomicCounter:
"""A thread-safe incrementing counter.
"""
##############################################
def __init__(self, initial=0):
"""Initialize a new atomic counter to given initial value (default 0)."""
self._value = initial
self._lock = threading.Lock()
##############################################
def __int__(self):
return self._value
##############################################
def increment(self, value=1):
"""Atomically increment the counter by value (default 1) and return the
new value.
"""
with self._lock:
self._value += value
return self._value