Server IP : 85.214.239.14 / Your IP : 3.143.1.47 Web Server : Apache/2.4.62 (Debian) System : Linux h2886529.stratoserver.net 4.9.0 #1 SMP Tue Jan 9 19:45:01 MSK 2024 x86_64 User : www-data ( 33) PHP Version : 7.4.18 Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_get_handler,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,pcntl_async_signals,pcntl_unshare, MySQL : OFF | cURL : OFF | WGET : ON | Perl : ON | Python : ON | Sudo : ON | Pkexec : OFF Directory : /proc/2/cwd/lib/python2.7/bsddb/ |
Upload File : |
#------------------------------------------------------------------------ # # Copyright (C) 2000 Autonomous Zone Industries # # License: This is free software. You may use this software for any # purpose including modification/redistribution, so long as # this header remains intact and that you do not claim any # rights of ownership or authorship of this software. This # software has been tested, but no warranty is expressed or # implied. # # Author: Gregory P. Smith <greg@krypto.org> # # Note: I don't know how useful this is in reality since when a # DBLockDeadlockError happens the current transaction is supposed to be # aborted. If it doesn't then when the operation is attempted again # the deadlock is still happening... # --Robin # #------------------------------------------------------------------------ # # import the time.sleep function in a namespace safe way to allow # "from bsddb.dbutils import *" # from time import sleep as _sleep import sys absolute_import = (sys.version_info[0] >= 3) if absolute_import : # Because this syntaxis is not valid before Python 2.5 exec("from . import db") else : import db # always sleep at least N seconds between retrys _deadlock_MinSleepTime = 1.0/128 # never sleep more than N seconds between retrys _deadlock_MaxSleepTime = 3.14159 # Assign a file object to this for a "sleeping" message to be written to it # each retry _deadlock_VerboseFile = None def DeadlockWrap(function, *_args, **_kwargs): """DeadlockWrap(function, *_args, **_kwargs) - automatically retries function in case of a database deadlock. This is a function intended to be used to wrap database calls such that they perform retrys with exponentially backing off sleeps in between when a DBLockDeadlockError exception is raised. A 'max_retries' parameter may optionally be passed to prevent it from retrying forever (in which case the exception will be reraised). d = DB(...) d.open(...) DeadlockWrap(d.put, "foo", data="bar") # set key "foo" to "bar" """ sleeptime = _deadlock_MinSleepTime max_retries = _kwargs.get('max_retries', -1) if 'max_retries' in _kwargs: del _kwargs['max_retries'] while True: try: return function(*_args, **_kwargs) except db.DBLockDeadlockError: if _deadlock_VerboseFile: _deadlock_VerboseFile.write( 'dbutils.DeadlockWrap: sleeping %1.3f\n' % sleeptime) _sleep(sleeptime) # exponential backoff in the sleep time sleeptime *= 2 if sleeptime > _deadlock_MaxSleepTime: sleeptime = _deadlock_MaxSleepTime max_retries -= 1 if max_retries == -1: raise #------------------------------------------------------------------------