3 \@s|dZddlZddlZddlmZddlmZ ddl m Z ddl m ZmZyddlmZWn ek rxddlmZYnXdd d d d d dddddddddddddddgZejZejZejZejZejZy ejZ Wne!k rdZ YnXej"Z"[da#da$ddZ%ddZ&eZ'ddZGd d!d!Z(e(Z)Gd"d d Z*Gd#ddZ+Gd$dde+Z,Gd%ddZ-Gd&ddZ.Gd'dde/Z0ej1Z2e2d@d)d*Z3ea4iZ5iZ6e Z7Gd+ddZ8Gd,dde8Z9Gd-d.d.e8Z:Gd/d0d0e8Z;d1d Ze>Z?d3d4Z@d5d ZAdd6lmBZBe:aCd7d8ZDd9d:ZEd;d ZFyddd?ZJdS)Az;Thread module emulating a subset of Java's threading model.N) monotonic) format_exc)WeakSet)islicecount)deque get_ident active_count Conditioncurrent_thread enumerate main_thread TIMEOUT_MAXEventLockRLock SemaphoreBoundedSemaphoreThreadBarrierBrokenBarrierErrorTimer ThreadError setprofilesettracelocal stack_sizecCs|adS)zSet a profile function for all threads started from the threading module. The func will be passed to sys.setprofile() for each thread, before its run() method is called. N) _profile_hook)funcr!/usr/lib64/python3.6/threading.pyr2scCs|adS)zSet a trace function for all threads started from the threading module. The func will be passed to sys.settrace() for each thread, before its run() method is called. N) _trace_hook)rrrr r<scOstdkrt||St||S)a2Factory function that returns a new reentrant lock. A reentrant lock must be released by the thread that acquired it. Once a thread has acquired a reentrant lock, the same thread may acquire it again without blocking; the thread must release it once for each time it has acquired it. N)_CRLock_PyRLock)argskwargsrrr rJs  c@sVeZdZdZddZddZddd ZeZd d Zd d Z ddZ ddZ ddZ dS)_RLocka,This class implements reentrant lock objects. A reentrant lock must be released by the thread that acquired it. Once a thread has acquired a reentrant lock, the same thread may acquire it again without blocking; the thread must release it once for each time it has acquired it. cCst|_d|_d|_dS)Nr)_allocate_lock_block_owner_count)selfrrr __init__asz_RLock.__init__cCs^|j}yt|j}Wntk r(YnXd|jjr:dnd|jj|jj||j t t |fS)Nz)<%s %s.%s object owner=%r count=%d at %s>lockedZunlocked) r)_activenameKeyErrorr(r- __class__ __module__ __qualname__r*hexid)r+ownerrrr __repr__fsz_RLock.__repr__TcCsDt}|j|kr"|jd7_dS|jj||}|r@||_d|_|S)aAcquire a lock, blocking or non-blocking. When invoked without arguments: if this thread already owns the lock, increment the recursion level by one, and return immediately. Otherwise, if another thread owns the lock, block until the lock is unlocked. Once the lock is unlocked (not owned by any thread), then grab ownership, set the recursion level to one, and return. 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There is no return value. zcannot release un-acquired lockr8N)r)r RuntimeErrorr*r(release)r+rrrr r?s  z_RLock.releasecCs |jdS)N)r?)r+tvtbrrr __exit__sz_RLock.__exit__cCs|jj|\|_|_dS)N)r(r9r*r))r+staterrr _acquire_restores z_RLock._acquire_restorecCs<|jdkrtd|j}d|_|j}d|_|jj||fS)Nrzcannot release un-acquired lock)r*r>r)r(r?)r+rr6rrr _release_saves  z_RLock._release_savecCs |jtkS)N)r)r)r+rrr _is_ownedsz_RLock._is_ownedN)TrH) __name__r2r3__doc__r,r7r9 __enter__r?rCrErFrGrrrr r&Ws $ r&c@steZdZdZdddZddZddZd d Zd d Zd dZ ddZ dddZ dddZ dddZ ddZeZdS)r ajClass that implements a condition variable. A condition variable allows one or more threads to wait until they are notified by another thread. If the lock argument is given and not None, it must be a Lock or RLock object, and it is used as the underlying lock. Otherwise, a new RLock object is created and used as the underlying lock. NcCs|dkrt}||_|j|_|j|_y |j|_Wntk rDYnXy |j|_Wntk rfYnXy |j|_Wntk rYnXt|_ dS)N) r_lockr9r?rFAttributeErrorrErG_deque_waiters)r+lockrrr r,s$   zCondition.__init__cCs |jjS)N)rLrK)r+rrr rKszCondition.__enter__cGs |jj|S)N)rLrC)r+r$rrr rCszCondition.__exit__cCsd|jt|jfS)Nz)rLlenrO)r+rrr r7szCondition.__repr__cCs|jjdS)N)rLr?)r+rrr rFszCondition._release_savecCs|jjdS)N)rLr9)r+xrrr rEszCondition._acquire_restorecCs"|jjdr|jjdSdSdS)NrFT)rLr9r?)r+rrr rGs  zCondition._is_ownedcCs|jstdt}|j|jj||j}d}z:|dkrN|jd}n |dkrd|jd|}n |jd}|S|j||sy|jj|Wnt k rYnXXdS)akWait until notified or until a timeout occurs. If the calling thread has not acquired the lock when this method is called, a RuntimeError is raised. This method releases the underlying lock, and then blocks until it is awakened by a notify() or notify_all() call for the same condition variable in another thread, or until the optional timeout occurs. Once awakened or timed out, it re-acquires the lock and returns. When the timeout argument is present and not None, it should be a floating point number specifying a timeout for the operation in seconds (or fractions thereof). When the underlying lock is an RLock, it is not released using its release() method, since this may not actually unlock the lock when it was acquired multiple times recursively. Instead, an internal interface of the RLock class is used, which really unlocks it even when it has been recursively acquired several times. Another internal interface is then used to restore the recursion level when the lock is reacquired. zcannot wait on un-acquired lockFNTr) rGr>r'r9rOappendrFrEremove ValueError)r+r;waiterZ saved_stateZgotitrrr waits*   zCondition.waitcCs\d}|}|}xH|sV|dk rD|dkr0t|}n|t}|dkrDP|j||}qW|S)zWait until a condition evaluates to True. predicate should be a callable which result will be interpreted as a boolean value. A timeout may be provided giving the maximum time to wait. Nr)_timerW)r+Z predicater;endtimeZwaittimeresultrrr wait_for7s    zCondition.wait_forr8c Csj|jstd|j}tt||}|s,dSx8|D]0}|jy|j|Wq2tk r`Yq2Xq2WdS)aKWake up one or more threads waiting on this condition, if any. If the calling thread has not acquired the lock when this method is called, a RuntimeError is raised. This method wakes up at most n of the threads waiting for the condition variable; it is a no-op if no threads are waiting. z!cannot notify on un-acquired lockN)rGr>rOrN_islicer?rTrU)r+nZ all_waitersZwaiters_to_notifyrVrrr notifyNs  zCondition.notifycCs|jt|jdS)zWake up all threads waiting on this condition. If the calling thread has not acquired the lock when this method is called, a RuntimeError is raised. N)r^rQrO)r+rrr notify_alleszCondition.notify_all)N)N)N)r8)rIr2r3rJr,rKrCr7rFrErGrWr[r^r_Z notifyAllrrrr r s   0   c@s8eZdZdZd ddZdddZeZd d Zd d ZdS)raGThis class implements semaphore objects. Semaphores manage a counter representing the number of release() calls minus the number of acquire() calls, plus an initial value. The acquire() method blocks if necessary until it can return without making the counter negative. If not given, value defaults to 1. r8cCs&|dkrtdtt|_||_dS)Nrz$semaphore initial value must be >= 0)rUr r_cond_value)r+valuerrr r,}s zSemaphore.__init__TNc Cs| r|dk rtdd}d}|jjxb|jdkrv|s8P|dk rh|dkrTt|}n|t}|dkrhP|jj|q(W|jd8_d}WdQRX|S)aAcquire a semaphore, decrementing the internal counter by one. When invoked without arguments: if the internal counter is larger than zero on entry, decrement it by one and return immediately. If it is zero on entry, block, waiting until some other thread has called release() to make it larger than zero. This is done with proper interlocking so that if multiple acquire() calls are blocked, release() will wake exactly one of them up. The implementation may pick one at random, so the order in which blocked threads are awakened should not be relied on. There is no return value in this case. When invoked with blocking set to true, do the same thing as when called without arguments, and return true. When invoked with blocking set to false, do not block. If a call without an argument would block, return false immediately; otherwise, do the same thing as when called without arguments, and return true. When invoked with a timeout other than None, it will block for at most timeout seconds. If acquire does not complete successfully in that interval, return false. Return true otherwise. Nz.can't specify timeout for non-blocking acquireFrr8T)rUr`rarXrW)r+r:r;r=rYrrr r9s$   zSemaphore.acquirec Cs.|j|jd7_|jjWdQRXdS)zRelease a semaphore, incrementing the internal counter by one. When the counter is zero on entry and another thread is waiting for it to become larger than zero again, wake up that thread. r8N)r`rar^)r+rrr r?szSemaphore.releasecCs |jdS)N)r?)r+r@rArBrrr rCszSemaphore.__exit__)r8)TN) rIr2r3rJr,r9rKr?rCrrrr rqs   - c@s"eZdZdZdddZddZdS) raImplements a bounded semaphore. A bounded semaphore checks to make sure its current value doesn't exceed its initial value. If it does, ValueError is raised. In most situations semaphores are used to guard resources with limited capacity. If the semaphore is released too many times it's a sign of a bug. If not given, value defaults to 1. Like regular semaphores, bounded semaphores manage a counter representing the number of release() calls minus the number of acquire() calls, plus an initial value. The acquire() method blocks if necessary until it can return without making the counter negative. If not given, value defaults to 1. r8cCstj||||_dS)N)rr,_initial_value)r+rbrrr r,s zBoundedSemaphore.__init__c CsB|j2|j|jkrtd|jd7_|jjWdQRXdS)a6Release a semaphore, incrementing the internal counter by one. When the counter is zero on entry and another thread is waiting for it to become larger than zero again, wake up that thread. If the number of releases exceeds the number of acquires, raise a ValueError. z!Semaphore released too many timesr8N)r`rarcrUr^)r+rrr r?s  zBoundedSemaphore.releaseN)r8)rIr2r3rJr,r?rrrr rs c@sFeZdZdZddZddZddZeZdd Zd d Z dd dZ d S)rzClass implementing event objects. Events manage a flag that can be set to true with the set() method and reset to false with the clear() method. The wait() method blocks until the flag is true. The flag is initially false. cCstt|_d|_dS)NF)r rr`_flag)r+rrr r,s zEvent.__init__cCs|jjtdS)N)r`r,r)r+rrr _reset_internal_locksszEvent._reset_internal_lockscCs|jS)z5Return true if and only if the internal flag is true.)rd)r+rrr is_setsz Event.is_setc Cs&|jd|_|jjWdQRXdS)zSet the internal flag to true. All threads waiting for it to become true are awakened. Threads that call wait() once the flag is true will not block at all. TN)r`rdr_)r+rrr setsz Event.setc Cs|j d|_WdQRXdS)zReset the internal flag to false. Subsequently, threads calling wait() will block until set() is called to set the internal flag to true again. FN)r`rd)r+rrr clear sz Event.clearNc Cs,|j|j}|s|jj|}|SQRXdS)aHBlock until the internal flag is true. If the internal flag is true on entry, return immediately. Otherwise, block until another thread calls set() to set the flag to true, or until the optional timeout occurs. When the timeout argument is present and not None, it should be a floating point number specifying a timeout for the operation in seconds (or fractions thereof). This method returns the internal flag on exit, so it will always return True except if a timeout is given and the operation times out. N)r`rdrW)r+r;Zsignaledrrr rWs  z Event.wait)N) rIr2r3rJr,rerfZisSetrgrhrWrrrr rs  c@seZdZdZdddZdddZddZd d Zd d Zd dZ ddZ ddZ ddZ e ddZe ddZe ddZdS)rzImplements a Barrier. Useful for synchronizing a fixed number of threads at known synchronization points. Threads block on 'wait()' and are simultaneously once they have all made that call. NcCs.tt|_||_||_||_d|_d|_dS)aWCreate a barrier, initialised to 'parties' threads. 'action' is a callable which, when supplied, will be called by one of the threads after they have all entered the barrier and just prior to releasing them all. If a 'timeout' is provided, it is uses as the default for all subsequent 'wait()' calls. rN)r rr`_action_timeout_parties_stater*)r+partiesactionr;rrr r,?s zBarrier.__init__cCs|dkr|j}|jb|j|j}|jd7_z&|d|jkrL|jn |j||S|jd8_|jXWdQRXdS)aNWait for the barrier. When the specified number of threads have started waiting, they are all simultaneously awoken. If an 'action' was provided for the barrier, one of the threads will have executed that callback prior to returning. Returns an individual index number from 0 to 'parties-1'. Nr8)rjr`_enterr*rk_release_wait_exit)r+r;indexrrr rWOs   z Barrier.waitcCs,x|jdkr|jjqW|jdkr(tdS)Nr8rrH)rHr8)rlr`rWr)r+rrr roms   zBarrier._enterc Cs>y"|jr|jd|_|jjWn|jYnXdS)Nr8)rirlr`r__break)r+rrr rpxszBarrier._releasecs4jjfdd|s"jtjdkr0tdS)Ncs jdkS)Nr)rlr)r+rr szBarrier._wait..r)r`r[rtrrl)r+r;r)r+r rqs  z Barrier._waitcCs(|jdkr$|jdkr$d|_|jjdS)Nrr8rH)rHr8)r*rlr`r_)r+rrr rrs  z Barrier._exitc CsT|jD|jdkr6|jdkr$d|_q<|jdkrReturn the number of threads currently waiting at the barrier.r)rlr*)r+rrr n_waitings zBarrier.n_waitingcCs |jdkS)z0Return True if the barrier is in a broken state.rvrw)rl)r+rrr brokenszBarrier.broken)NN)N)rIr2r3rJr,rWrorprqrrrxryrtpropertyrmrzr{rrrr r6s       c@s eZdZdS)rN)rIr2r3rrrr rs Thread-%dcCs |tS)N)_counter)templaterrr _newnamesrc@seZdZdZdZejZdddfdfddddZddZ d d Z d d Z d dZ ddZ ddZddZddZddZddZd3ddZd5dd Zed!d"Zejd#d"Zed$d%Zd&d'ZeZed(d)Zejd*d)Zd+d,Zd-d.Zd/d0Zd1d2ZdS)6raA class that represents a thread of control. This class can be safely subclassed in a limited fashion. There are two ways to specify the activity: by passing a callable object to the constructor, or by overriding the run() method in a subclass. FN)daemoncCs~|dkr i}||_t|pt|_||_||_|dk r>||_n tj|_d|_ d|_ t |_ d|_ d|_tj|_tj|dS)aKThis constructor should always be called with keyword arguments. Arguments are: *group* should be None; reserved for future extension when a ThreadGroup class is implemented. *target* is the callable object to be invoked by the run() method. Defaults to None, meaning nothing is called. *name* is the thread name. By default, a unique name is constructed of the form "Thread-N" where N is a small decimal number. *args* is the argument tuple for the target invocation. Defaults to (). *kwargs* is a dictionary of keyword arguments for the target invocation. Defaults to {}. If a subclass overrides the constructor, it must make sure to invoke the base class constructor (Thread.__init__()) before doing anything else to the thread. NFT)_targetstrr_name_args_kwargs _daemonicr r_ident _tstate_lockr_started _is_stopped _initialized_sysstderr_stderr _danglingadd)r+grouptargetr/r$r%rrrr r,s  zThread.__init__cCs(|jj|r|jn d|_d|_dS)NT)rre_set_tstate_lockrr)r+is_aliverrr re"s   zThread._reset_internal_lockscCs^d}|jjrd}|j|jr$d}|jr2|d7}|jdk rJ|d|j7}d|jj|j|fS)NinitialZstartedZstoppedz daemonz %sz <%s(%s, %s)>) rrfrrrrr1rIr)r+Zstatusrrr r7.s  zThread.__repr__cCs|jstd|jjr tdt|t|<WdQRXyt|jfWn,tk rtt t|=WdQRXYnX|jj dS)a-Start the thread's activity. It must be called at most once per thread object. It arranges for the object's run() method to be invoked in a separate thread of control. This method will raise a RuntimeError if called more than once on the same thread object. zthread.__init__() not calledz threads can only be started onceN) rr>rrf_active_limbo_lock_limbo_start_new_thread _bootstrap ExceptionrW)r+rrr start<s  z Thread.startc Cs.z|jr|j|j|jWd|`|`|`XdS)aXMethod representing the thread's activity. You may override this method in a subclass. The standard run() method invokes the callable object passed to the object's constructor as the target argument, if any, with sequential and keyword arguments taken from the args and kwargs arguments, respectively. N)rrr)r+rrr runUs z Thread.runc Cs2y |jWn |jr&tdkr&dSYnXdS)N)_bootstrap_innerrr)r+rrr rfs  zThread._bootstrapcCs t|_dS)N)rr)r+rrr _set_identzszThread._set_identcCst|_|jjdS)z Set a lock object which will be released by the interpreter when the underlying thread state (see pystate.h) gets deleted. N) _set_sentinelrr9)r+rrr r}szThread._set_tstate_lockc2CszT|j|j|jjt|t|j<t|=WdQRXtrLt j tt rZt j t zy |j Wntk r|Ynt rt jdk rtd|jtft jdn|jdk rH|j\}}}zxtd|jd|jdtd|jdx6|r$td|jjj|j|jjjf|jd|j}qWtd||f|jdWd~~~XYnXWdXWdt y tt=Wn YnXWdQRXXdS)NzException in thread %s: %s)filezException in thread z2 (most likely raised during interpreter shutdown):z"Traceback (most recent call last):z File "%s", line %s, in %sz%s: %s)rrrrgrr.rrr!rrrrr SystemExitrprintr/ _format_excr _exc_infotb_framef_code co_filename tb_linenoco_nametb_nextr)r+exc_type exc_valueZexc_tbrrr rsT         zThread._bootstrap_innercCs|j}|dk rd|_d|_dS)NT)rr)r+rPrrr _stopsz Thread._stopcCsByttt=WdQRXWn tk r<dtjkr8YnXdS)zARemove current thread from the dict of currently running threads.NZdummy_threading)rr.rr0rmodules)r+rrr _deletes  zThread._deletecCsZ|jstd|jjs td|tkr2td|dkrD|jn|jt|dddS)aWait until the thread terminates. 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It is also an error to join() a thread before it has been started and attempts to do so raises the same exception. zThread.__init__() not calledz'cannot join thread before it is startedzcannot join current threadNr)r;)rr>rrfr _wait_for_tstate_lockmax)r+r;rrr joins   z Thread.joinTr8cCs0|j}|dkrn|j||r,|j|jdS)N)rr9r?r)r+blockr;rPrrr r&s  zThread._wait_for_tstate_lockcCs|jS)zA string used for identification purposes only. It has no semantics. Multiple threads may be given the same name. The initial name is set by the constructor. )r)r+rrr r/4s z Thread.namecCst||_dS)N)rr)r+r/rrr r/?scCs|jS)a4Thread identifier of this thread or None if it has not been started. This is a nonzero integer. See the get_ident() function. Thread identifiers may be recycled when a thread exits and another thread is created. The identifier is available even after the thread has exited. )r)r+rrr identDs z Thread.identcCs(|js|jj rdS|jd|j S)zReturn whether the thread is alive. 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