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体验新版 GitCode,发现更多精彩内容 >>
提交
aeb58ab7
编写于
2月 01, 2016
作者:
M
Matthew Draper
浏览文件
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电子邮件补丁
差异文件
Block new share attempts if there's an exclusive waiter
上级
92203edb
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
44 addition
and
8 deletion
+44
-8
activesupport/lib/active_support/concurrency/share_lock.rb
activesupport/lib/active_support/concurrency/share_lock.rb
+12
-8
activesupport/test/share_lock_test.rb
activesupport/test/share_lock_test.rb
+32
-0
未找到文件。
activesupport/lib/active_support/concurrency/share_lock.rb
浏览文件 @
aeb58ab7
...
...
@@ -48,14 +48,14 @@ def initialize
def
start_exclusive
(
purpose:
nil
,
compatible:
[],
no_wait:
false
)
synchronize
do
unless
@exclusive_thread
==
Thread
.
current
if
busy?
(
purpose
)
if
busy
_for_exclusive
?
(
purpose
)
return
false
if
no_wait
loose_shares
=
@sharing
.
delete
(
Thread
.
current
)
@waiting
[
Thread
.
current
]
=
compatible
if
loose_shares
begin
@cv
.
wait_while
{
busy?
(
purpose
)
}
@cv
.
wait_while
{
busy
_for_exclusive
?
(
purpose
)
}
ensure
@waiting
.
delete
Thread
.
current
@sharing
[
Thread
.
current
]
=
loose_shares
if
loose_shares
...
...
@@ -83,10 +83,10 @@ def stop_exclusive
end
end
def
start_sharing
def
start_sharing
(
purpose: :share
)
synchronize
do
if
@exclusive_thread
&&
@exclusive_thread
!=
Thread
.
current
@cv
.
wait_while
{
@exclusive_thread
}
if
busy_for_sharing?
(
purpose
)
@cv
.
wait_while
{
busy_for_sharing?
(
purpose
)
}
end
@sharing
[
Thread
.
current
]
+=
1
end
...
...
@@ -132,11 +132,15 @@ def sharing
private
# Must be called within synchronize
def
busy?
(
purpose
)
(
@exclusive_thread
&&
@exclusive_thread
!=
Thread
.
current
)
||
@waiting
.
any?
{
|
k
,
v
|
k
!=
Thread
.
current
&&
!
v
.
include?
(
purpose
)
}
||
def
busy_for_exclusive?
(
purpose
)
busy_for_sharing?
(
purpose
)
||
@sharing
.
size
>
(
@sharing
[
Thread
.
current
]
>
0
?
1
:
0
)
end
def
busy_for_sharing?
(
purpose
)
(
@exclusive_thread
&&
@exclusive_thread
!=
Thread
.
current
)
||
@waiting
.
any?
{
|
k
,
v
|
k
!=
Thread
.
current
&&
!
v
.
include?
(
purpose
)
}
end
end
end
end
activesupport/test/share_lock_test.rb
浏览文件 @
aeb58ab7
...
...
@@ -114,14 +114,17 @@ def test_exclusive_conflicting_purpose
[
true
,
false
].
each
do
|
use_upgrading
|
with_thread_waiting_in_lock_section
(
:sharing
)
do
|
sharing_thread_release_latch
|
begin
together
=
Concurrent
::
CyclicBarrier
.
new
(
2
)
conflicting_exclusive_threads
=
[
Thread
.
new
do
@lock
.
send
(
use_upgrading
?
:sharing
:
:tap
)
do
together
.
wait
@lock
.
exclusive
(
purpose: :red
,
compatible:
[
:green
,
:purple
])
{}
end
end
,
Thread
.
new
do
@lock
.
send
(
use_upgrading
?
:sharing
:
:tap
)
do
together
.
wait
@lock
.
exclusive
(
purpose: :blue
,
compatible:
[
:green
])
{}
end
end
...
...
@@ -183,11 +186,14 @@ def test_exclusive_ordering
load_params
=
[
:load
,
[
:load
]]
unload_params
=
[
:unload
,
[
:unload
,
:load
]]
all_sharing
=
Concurrent
::
CyclicBarrier
.
new
(
4
)
[
load_params
,
load_params
,
unload_params
,
unload_params
].
permutation
do
|
thread_params
|
with_thread_waiting_in_lock_section
(
:sharing
)
do
|
sharing_thread_release_latch
|
threads
=
thread_params
.
map
do
|
purpose
,
compatible
|
Thread
.
new
do
@lock
.
sharing
do
all_sharing
.
wait
@lock
.
exclusive
(
purpose:
purpose
,
compatible:
compatible
)
do
scratch_pad_mutex
.
synchronize
{
scratch_pad
<<
purpose
}
end
...
...
@@ -209,6 +215,32 @@ def test_exclusive_ordering
end
end
def
test_new_share_attempts_block_on_waiting_exclusive
with_thread_waiting_in_lock_section
(
:sharing
)
do
|
sharing_thread_release_latch
|
release_exclusive
=
Concurrent
::
CountDownLatch
.
new
waiting_exclusive
=
Thread
.
new
do
@lock
.
sharing
do
@lock
.
exclusive
do
release_exclusive
.
wait
end
end
end
assert_threads_stuck
waiting_exclusive
late_share_attempt
=
Thread
.
new
do
@lock
.
sharing
{}
end
assert_threads_stuck
late_share_attempt
sharing_thread_release_latch
.
count_down
assert_threads_stuck
late_share_attempt
release_exclusive
.
count_down
assert_threads_not_stuck
late_share_attempt
end
end
def
test_in_shared_section_incompatible_non_upgrading_threads_cannot_preempt_upgrading_threads
scratch_pad
=
[]
scratch_pad_mutex
=
Mutex
.
new
...
...
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