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//! [0]
number = 6
def method1():
number *= 5
number /= 4
def method2():
number *= 3
number /= 2
//! [0]
//! [1]
# method1()
number *= 5 # number is now 30
number /= 4 # number is now 7
# method2()
number *= 3 # number is now 21
number /= 2 # number is now 10
//! [1]
//! [2]
# Thread 1 calls method1()
number *= 5 # number is now 30
# Thread 2 calls method2().
#
# Most likely Thread 1 has been put to sleep by the operating
# system to allow Thread 2 to run.
number *= 3 # number is now 90
number /= 2 # number is now 45
# Thread 1 finishes executing.
number /= 4 # number is now 11, instead of 10
//! [2]
//! [3]
mutex = QMutex()
number = 6
def method1():
mutex.lock()
number *= 5
number /= 4
mutex.unlock()
def method2():
mutex.lock()
number *= 3
number /= 2
mutex.unlock()
//! [3]
//! [4]
def complexFunction(flag):
mutex.lock()
retVal = 0
if flag == 0 or flag == 1:
mutex.unlock()
return moreComplexFunction(flag)
elif flag == 2:
status = anotherFunction()
if status < 0:
mutex.unlock()
return -2
retVal = status + flag
else:
if flag > 10:
mutex.unlock()
return -1
mutex.unlock()
return retVal
//! [4]
//! [5]
def complexFunction(flag):
locker = QMutexLocker(mutex)
retVal = 0
if flag == 0 or flag == 1:
return moreComplexFunction(flag)
elif flag == 2:
status = anotherFunction()
if status < 0:
return -2
retVal = status + flag
else:
if flag > 10:
return -1
return retVal
//! [5]
//! [6]
class SignalWaiter:
def __init__(mutex):
self.locker = mutex
def waitForSignal():
# ...
while not signalled:
waitCondition.wait(self.locker.mutex())
# ...
//! [6]
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