在資源設計中，所有的資源從配置檔案中讀出後成為例項儲存，通常情況下資源的名字是唯一的，因此可以通過資源名作為的鎖的關鍵字，然後使用乙個結構體來儲存相應資源的鎖資訊，並使用訊號量來標識鎖狀態
假設執行緒a對該資源進行操作，重置了訊號量，當執行緒b也需要使用該資源並對其進行加鎖的時候，就會因為該資源所對應的訊號量而阻塞住執行緒，直到該訊號量被執行緒a置位，代表執行緒a對該資源的占用結束，執行緒b才能繼續
from core.result.logger import logger
from core.utilities.time import get_local_time
from threading import event, thread
import time
class
resourceislocked
(exception)
:def
__init__
(self, resource, event, timeout)
:super()
.__init__(f"resource is locked by and not released in s"
)class
invalidlockoperation
(exception)
:pass
class
resourcelockpool
:"""
資源鎖池
"""def__init__
(self, log=
none):
self.log = log if log is
notnone
else logger.register(
"resourcelockpool"
, default_level=
"info"
) self.resource =
dict()
deflock
(self, resource, event, timeout=60)
:"""
鎖定資源
"""if resource.name in self.resource:
lock = self.resource[resource.name]
['lock'
] event_name = self.resource[resource.name]
['event']if
not lock.wait(timeout)
:raise resourceislocked(resource.name, event_name, timeout)
self.log.info(f"lock : time: "
) self.resource[resource.name]
=def
release
(self, resource, event)
:"""
釋放資源
"""if resource.name in self.resource:
if self.resource[resource.name]
['event'
]== event:
self.log.info(f"release lock for "
) self.resource[resource.name]
['lock'].
set(
) self.resource.pop(resource.name)
else
:raise invalidlockoperation(
f" is locked by "
)else
:raise invalidlockoperation(f' is not locked'
)if __name__ ==
"__main__"
:class
testresource
:"""
代表測試資源類
"""def__init__
(self, name)
: self.name = name
log = logger.register(
"testlog"
) pool = resourcelockpool(log)
device1 = testresource(
'device1'
)"""
測試:定義兩個方法，用來在兩個執行緒中對同乙個資源進行訪問
"""deftest_method1()
: pool.lock(device1,
"event1"
) log.info(
"method1 start"
) time.sleep(10)
pool.release(device1,
"event1"
) log.info(
"method1 stop"
)def
test_method2()
: pool.lock(device1,
"event2"
) log.info(
"method2 start"
) time.sleep(10)
pool.release(device1,
"event2"
) log.info(
"method2 stop"
) thread1 = thread(target=test_method1)
thread2 = thread(target=test_method2)
threads =
[thread1, thread2]
for t in threads:
t.start(
)for t in threads:
t.join(
)
[2020-08-01 11:20:18,258]
[testlog]--(line:33), [info]: lock device1: time: august 01, 20 11:20:18
[2020-08-01 11:20:18,258]
[testlog]--(line:70), [info]: method1 start
[2020-08-01 11:20:28,271]
[testlog]--(line:46), [info]: release lock for device1
[2020-08-01 11:20:28,271]
[testlog]--(line:73), [info]: method1 stop
[2020-08-01 11:20:28,271]
[testlog]--(line:33), [info]: lock device1: time: august 01, 20 11:20:28
[2020-08-01 11:20:28,271]
[testlog]--(line:78), [info]: method2 start
[2020-08-01 11:20:38,280]
[testlog]--(line:46), [info]: release lock for device1
[2020-08-01 11:20:38,280]
[testlog]--(line:81), [info]: method2 stop
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