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体验新版 GitCode,发现更多精彩内容 >>
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f02bd2a9
编写于
2月 01, 2016
作者:
M
Matthew Draper
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差异文件
While new sharers are blocked, an existing sharer remains re-entrant
上级
aeb58ab7
变更
2
隐藏空白更改
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并排
Showing
2 changed file
with
30 addition
and
1 deletion
+30
-1
activesupport/lib/active_support/concurrency/share_lock.rb
activesupport/lib/active_support/concurrency/share_lock.rb
+1
-1
activesupport/test/share_lock_test.rb
activesupport/test/share_lock_test.rb
+29
-0
未找到文件。
activesupport/lib/active_support/concurrency/share_lock.rb
浏览文件 @
f02bd2a9
...
...
@@ -85,7 +85,7 @@ def stop_exclusive
def
start_sharing
(
purpose: :share
)
synchronize
do
if
busy_for_sharing?
(
purpose
)
if
@sharing
[
Thread
.
current
]
==
0
&&
@exclusive_thread
!=
Thread
.
current
&&
busy_for_sharing?
(
purpose
)
@cv
.
wait_while
{
busy_for_sharing?
(
purpose
)
}
end
@sharing
[
Thread
.
current
]
+=
1
...
...
activesupport/test/share_lock_test.rb
浏览文件 @
f02bd2a9
...
...
@@ -241,6 +241,35 @@ def test_new_share_attempts_block_on_waiting_exclusive
end
end
def
test_share_remains_reentrant_ignoring_a_waiting_exclusive
with_thread_waiting_in_lock_section
(
:sharing
)
do
|
sharing_thread_release_latch
|
ready
=
Concurrent
::
CyclicBarrier
.
new
(
2
)
attempt_reentrancy
=
Concurrent
::
CountDownLatch
.
new
sharer
=
Thread
.
new
do
@lock
.
sharing
do
ready
.
wait
attempt_reentrancy
.
wait
@lock
.
sharing
{}
end
end
exclusive
=
Thread
.
new
do
@lock
.
sharing
do
ready
.
wait
@lock
.
exclusive
{}
end
end
assert_threads_stuck
exclusive
attempt_reentrancy
.
count_down
assert_threads_not_stuck
sharer
assert_threads_stuck
exclusive
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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