Python Lock.acquire方法代码示例

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
def daemonize(args, callback):
    with DaemonContext():
        from touchandgo.logger import log_set_up
        log_set_up(True)
        log = logging.getLogger('touchandgo.daemon')
        log.info("running daemon")
        create_process = False
        lock = Lock(LOCKFILE, os.getpid(), args.name, args.sea_ep[0],
                    args.sea_ep[1], args.port)
        if lock.is_locked():
            log.debug("lock active")
            lock_pid = lock.get_pid()
            if not lock.is_same_file(args.name, args.sea_ep[0],
                                     args.sea_ep[1]) \
                    or not is_process_running(lock_pid):
                try:
                    log.debug("killing process %s" % lock_pid)
                    os.kill(lock_pid, signal.SIGQUIT)
                except OSError:
                    pass
                except TypeError:
                    pass
                lock.break_lock()
                create_process = True
        else:
            create_process = True

        if create_process:
            log.debug("creating proccess")
            lock.acquire()
            callback()
            lock.release()
        else:
            log.debug("same daemon process")

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
def detachThin(session, lvmCache, srUuid, vdiUuid):
    """Shrink the VDI to the minimal size if no one is using it"""
    lvName = LV_PREFIX[VDI_TYPE_VHD] + vdiUuid
    path = os.path.join(VG_LOCATION, VG_PREFIX + srUuid, lvName)
    lock = Lock(vhdutil.LOCK_TYPE_SR, srUuid)
    lock.acquire()

    vdiRef = session.xenapi.VDI.get_by_uuid(vdiUuid)
    vbds = session.xenapi.VBD.get_all_records_where( \
            "field \"VDI\" = \"%s\"" % vdiRef)
    numPlugged = 0
    for vbdRec in vbds.values():
        if vbdRec["currently_attached"]:
            numPlugged += 1

    if numPlugged > 1:
        raise util.SMException("%s still in use by %d others" % \
                (vdiUuid, numPlugged - 1))
    lvmCache.activate(NS_PREFIX_LVM + srUuid, vdiUuid, lvName, False)
    try:
        newSize = calcSizeLV(vhdutil.getSizePhys(path))
        deflate(lvmCache, lvName, newSize)
    finally:
        lvmCache.deactivate(NS_PREFIX_LVM + srUuid, vdiUuid, lvName, False)
    lock.release()

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
class PhysicalView(Base):
    def __init__(self, dfs):
        Base.__init__(self, dfs)
        self.lock_ = Lock(dfs)
        self.createBaseFolder()

    def read(self, fileName, buf, offset, bufsize):
        # TODO add thread safetly
        filePath = os.path.join(self.getBasePath(), fileName)
        size = self.getFileSize(fileName)
        if offset + bufsize > size:
            self.log_.w('tried to read ' + fileName + ' but size is ' + str(size) +
                        ' and bufsize + offset = ' + str(offset + bufsize))
            return err.InvalidBufferSize

        self.lock_.acquire()
        try:
            f = open(filePath, "r")
        except Exception, ex:
            self.log_.e('error opening file in read mode ' + filePath + ': ' + str(ex))
            self.lock_.release()
            return err.FileNotFound

        status = err.OK
        f.seek(offset)
        try:
            data = f.read(bufsize)
            for i, d in enumerate(data):
                buf[i] = d
        except Exception, ex:
            self.log_.e('failed to read ' + filePath + ' from ' + str(offset) + ' to ' + str(offset + bufsize) + ': ' + str(ex))
            status = err.CannotReadFile

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
def daemonize(args, callback):
    with DaemonContext():
        create_process = False
        lock = Lock(LOCKFILE, os.getpid(), args.name, args.sea_ep[0],
                    args.sea_ep[1], args.port)
        if lock.is_locked():
            lock_pid = lock.get_pid()
            if not lock.is_same_file(args.name, args.sea_ep[0],
                                    args.sea_ep[1]) \
                    or not is_process_running(lock_pid):
                try:
                    os.kill(lock_pid, signal.SIGQUIT)
                except OSError:
                    pass
                except TypeError:
                    pass
                lock.break_lock()
                create_process = True
        else:
            create_process = True

        if create_process:
            lock.acquire()
            callback(args.name, season=args.sea_ep[0], episode=args.sea_ep[1],
                     serve=True, port=args.port)
            lock.release()

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
 def checkLocked(obj, ns):
     """Lock-protected access"""
     lock = Lock(obj, ns)
     lock.acquire()
     try:
         return RefCounter.check(obj, ns)
     finally:
         lock.release()

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
 def setReadonly(self, lvName, readonly):
     path = self._getPath(lvName)
     if self.lvs[lvName].readonly != readonly:
         uuids = util.findall_uuid(path)
         ns = lvhdutil.NS_PREFIX_LVM + uuids[0]
         lock = Lock(uuids[1], ns)
         lock.acquire()
         lvutil.setReadonly(path, readonly)
         lock.release()
         self.lvs[lvName].readonly = readonly

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
 def setReadonly(self, lvName, readonly):
     path = self._getPath(lvName)
     if self.lvs[lvName].readonly != readonly:
         uuids = util.findall_uuid(path)
         ns = lvhdutil.NS_PREFIX_LVM + uuids[0]
         # Taking this lock is needed to avoid a race condition
         # with tap-ctl open (which is now taking the same lock)
         lock = Lock("lvchange-p", ns)
         lock.acquire()
         lvutil.setReadonly(path, readonly)
         lock.release()
         self.lvs[lvName].readonly = readonly

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
 def activate(self, ns, ref, lvName, binary):
     lock = Lock(ref, ns)
     lock.acquire()
     try:
         count = RefCounter.get(ref, binary, ns)
         if count == 1:
             try:
                 self.activateNoRefcount(lvName)
             except util.CommandException:
                 RefCounter.put(ref, binary, ns)
                 raise
     finally:
         lock.release()

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
    def _cbt_op(self, uuid, func, *args):
        # Lock cbtlog operations
        from lock import Lock
        lock = Lock("cbtlog", str(uuid))
        lock.acquire()

        try:
            logname = self._get_cbt_logname(uuid)
            activated = self._activate_cbt_log(logname)
            ret = func(*args)
            if activated:
                self._deactivate_cbt_log(logname)
            return ret
        finally:
            lock.release()

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
    def deactivate(self, sr_uuid, vdi_uuid):
        """Deactivate VDI - called post tapdisk close"""
        if self._get_blocktracking_status():
            from lock import Lock
            lock = Lock("cbtlog", str(vdi_uuid))
            lock.acquire()

            try:
                logpath = self._get_cbt_logpath(vdi_uuid)
                logname = self._get_cbt_logname(vdi_uuid)
                self._cbt_op(vdi_uuid, cbtutil.set_cbt_consistency, logpath, True)
                # Finally deactivate log file
                self._deactivate_cbt_log(logname)
            finally:
                lock.release()

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
def deactivateVdi(sr_uuid, vdi_uuid, vhd_path):
    name_space = lvhdutil.NS_PREFIX_LVM + sr_uuid
    lock = Lock(vdi_uuid, name_space)
    lock.acquire()
    try:
        count = RefCounter.put(vdi_uuid, False, name_space)
        if count > 0:
            return
        try:
            lvutil.deactivateNoRefcount(vhd_path)
        except Exception, e:
            util.SMlog("  lv de-activate failed for %s with error %s" %
                       (vhd_path, str(e)))
            RefCounter.get(vdi_uuid, False, name_space)
    finally:
        lock.release()

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
class LogicalView(Base):

    def __init__(self, dfs):
        Base.__init__(self, dfs)
        self.lock_ = Lock(dfs)
        self.fileList_ = {}

    def beginLocalUpdate(self, fileName):
        file = self.getFile(fileName)
        if file.latestVersion != file.localVersion:
            file.localVersion = file.latestVersion.copy()
            file.ownNoChunks()

    def add(self, fileName, fileSize):
        self.lock_.acquire()
        f = File(fileName, 1, fileSize, self.dfs_.id.str)
        self.fileList_[fileName] = f
        self.lock_.release()

    def delete(self, fileName):
        self.lock_.acquire()
        self.fileList_[fileName].isDeleted = True
        self.lock_.release()

    def exists(self, fileName):
        return (fileName in self.fileList_)

    def getLocalVersion(self, fileName):
        return self.fileList_[fileName].getLocalVersion()

    def getLatestVersion(self, fileName):
        return self.fileList_[fileName].getLatestVersion()

    def setNewVersion(self, fileName, version):
        self.fileList_[fileName].setNewVersion(version.copy())

    def setLocalVersion(self, fileName, numEdits, fileSize, lastEdited):
        self.fileList_[fileName].setLocalVersion(numEdits, fileSize, lastEdited)

    def getFileList(self):
        return self.fileList_.values()

    def getState(self):
        return self.fileList_

    def getFile(self, fileName):
        return self.fileList_[fileName]

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
def attachThin(journaler, srUuid, vdiUuid):
    """Ensure that the VDI LV is expanded to the fully-allocated size"""
    lvName = LV_PREFIX[VDI_TYPE_VHD] + vdiUuid
    vgName = VG_PREFIX + srUuid
    lock = Lock(vhdutil.LOCK_TYPE_SR, srUuid)
    lvmCache = journaler.lvmCache
    lock.acquire()
    vhdInfo = vhdutil.getVHDInfoLVM(lvName, extractUuid, vgName)
    newSize = calcSizeVHDLV(vhdInfo.sizeVirt)
    currSizeLV = lvmCache.getSize(lvName)
    if newSize <= currSizeLV:
        return
    lvmCache.activate(NS_PREFIX_LVM + srUuid, vdiUuid, lvName, False)
    try:
        inflate(journaler, srUuid, vdiUuid, newSize)
    finally:
        lvmCache.deactivate(NS_PREFIX_LVM + srUuid, vdiUuid, lvName, False)
    lock.release()

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
 def deactivate(self, ns, ref, lvName, binary):
     lock = Lock(ref, ns)
     lock.acquire()
     try:
         count = RefCounter.put(ref, binary, ns)
         if count > 0:
             return
         refreshed = False
         while True:
             lvInfo = self.getLVInfo(lvName)
             if len(lvInfo) != 1:
                 raise util.SMException("LV info not found for %s" % ref)
             info = lvInfo[lvName]
             if info.open:
                 if refreshed:
                     # should never happen in normal conditions but in some 
                     # failure cases the recovery code may not be able to 
                     # determine what the correct refcount should be, so it 
                     # is not unthinkable that the value might be out of 
                     # sync
                     util.SMlog("WARNING: deactivate: LV %s open" % lvName)
                     return
                 # check again in case the cached value is stale
                 self.refresh()
                 refreshed = True
             else:
                 break
         try:
             self.deactivateNoRefcount(lvName)
         except util.CommandException:
             self.refresh()
             if self.getLVInfo(lvName):
                 util.SMlog("LV %s could not be deactivated" % lvName)
                 if lvInfo[lvName].active:
                     util.SMlog("Reverting the refcount change")
                     RefCounter.get(ref, binary, ns)
                 raise
             else:
                 util.SMlog("LV %s not found" % lvName)
     finally:
         lock.release()

# 需要导入模块: from lock import Lock [as 别名]
# 或者: from lock.Lock import acquire [as 别名]
    def activate(self, sr_uuid, vdi_uuid):
        """Activate VDI - called pre tapdisk open"""
        if self._get_blocktracking_status():
            if self.sr.srcmd.params.has_key('args'):
                read_write = self.sr.srcmd.params['args'][0]
                if read_write == "false":
                    # Disk is being attached in RO mode, 
                    # don't attach metadata log file
                    return None
 
            from lock import Lock
            lock = Lock("cbtlog", str(vdi_uuid))
            lock.acquire()

            try:
                logpath = self._get_cbt_logpath(vdi_uuid)
                logname = self._get_cbt_logname(vdi_uuid)

                # Activate CBT log file, if required
                self._activate_cbt_log(logname)
            finally:
                lock.release()

            # Check and update consistency
            consistent = self._cbt_op(vdi_uuid, cbtutil.get_cbt_consistency,
                                      logpath)
            if not consistent:
                alert_name = "VDI_CBT_METADATA_INCONSISTENT"
                alert_str = ("Changed Block Tracking metadata is inconsistent"
                             " for disk %s." % vdi_uuid)
                self._disable_cbt_on_error(alert_name, alert_str)
                return None

            self._cbt_op(self.uuid, cbtutil.set_cbt_consistency,
                         logpath, False)
            return {'cbtlog': logpath}
        return None