xen/xen - xen

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author	Keir Fraser <keir.fraser@citrix.com>	2009-11-03 08:38:55 +0000
committer	Keir Fraser <keir.fraser@citrix.com>	2009-11-03 08:38:55 +0000
commit	92e6cb5673b37bd883bdef0d0e83faf000edf61d (patch)
tree	f6b955bd8158b41a7d0ffb421fdb3fccd480e0c7 /tools/vnet/vnet-module/vnet.c
parent	45c3fa3c2d40933a1e44218525eb3756014a88a1 (diff)
download	xen-92e6cb5673b37bd883bdef0d0e83faf000edf61d.tar.gz xen-92e6cb5673b37bd883bdef0d0e83faf000edf61d.tar.bz2 xen-92e6cb5673b37bd883bdef0d0e83faf000edf61d.zip

Linux vbd hotplug: Avoid "leaked" loopback devices

Avoid races between hotplug "add" and "remove" leading to "leaked" loopback devices. - Don't setup loopback device if xend is no longer waiting for the vbd. - Use the lock file to avoid add/remove races. Signed-off-by: Gary Grebus <gary.grebus@oracle.com>

Diffstat (limited to 'tools/vnet/vnet-module/vnet.c')

0 files changed, 0 insertions, 0 deletions

/* ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ /** * @file serial.h * @brief Serial Driver macros and structures. * * @addtogroup SERIAL * @{ */ #ifndef _SERIAL_H_ #define _SERIAL_H_ #if (HAL_USE_SERIAL == TRUE) || defined(__DOXYGEN__) /*===========================================================================*/ /* Driver constants. */ /*===========================================================================*/ /** * @name Serial status flags * @{ */ #define SD_PARITY_ERROR (eventflags_t)32 /**< @brief Parity. */ #define SD_FRAMING_ERROR (eventflags_t)64 /**< @brief Framing. */ #define SD_OVERRUN_ERROR (eventflags_t)128 /**< @brief Overflow. */ #define SD_NOISE_ERROR (eventflags_t)256 /**< @brief Line noise. */ #define SD_BREAK_DETECTED (eventflags_t)512 /**< @brief LIN Break. */ /** @} */ /*===========================================================================*/ /* Driver pre-compile time settings. */ /*===========================================================================*/ /** * @name Serial configuration options * @{ */ /** * @brief Default bit rate. * @details Configuration parameter, this is the baud rate selected for the * default configuration. */ #if !defined(SERIAL_DEFAULT_BITRATE) || defined(__DOXYGEN__) #define SERIAL_DEFAULT_BITRATE 38400 #endif /** * @brief Serial buffers size. * @details Configuration parameter, you can change the depth of the queue * buffers depending on the requirements of your application. * @note The default is 16 bytes for both the transmission and receive * buffers. */ #if !defined(SERIAL_BUFFERS_SIZE) || defined(__DOXYGEN__) #define SERIAL_BUFFERS_SIZE 16 #endif /** @} */ /*===========================================================================*/ /* Derived constants and error checks. */ /*===========================================================================*/ /*===========================================================================*/ /* Driver data structures and types. */ /*===========================================================================*/ /** * @brief Driver state machine possible states. */ typedef enum { SD_UNINIT = 0, /**< Not initialized. */ SD_STOP = 1, /**< Stopped. */ SD_READY = 2 /**< Ready. */ } sdstate_t; /** * @brief Structure representing a serial driver. */ typedef struct SerialDriver SerialDriver; #include "serial_lld.h" /** * @brief @p SerialDriver specific methods. */ #define _serial_driver_methods \ _base_asynchronous_channel_methods /** * @extends BaseAsynchronousChannelVMT * * @brief @p SerialDriver virtual methods table. */ struct SerialDriverVMT { _serial_driver_methods }; /** * @extends BaseAsynchronousChannel * * @brief Full duplex serial driver class. * @details This class extends @p BaseAsynchronousChannel by adding physical * I/O queues. */ struct SerialDriver { /** @brief Virtual Methods Table.*/ const struct SerialDriverVMT *vmt; _serial_driver_data }; /*===========================================================================*/ /* Driver macros. */ /*===========================================================================*/ /** * @name Macro Functions * @{ */ /** * @brief Direct output check on a @p SerialDriver. * @note This function bypasses the indirect access to the channel and * checks directly the output queue. This is faster but cannot * be used to check different channels implementations. * * @deprecated * * @api */ #define sdPutWouldBlock(sdp) oqIsFullI(&(sdp)->oqueue) /** * @brief Direct input check on a @p SerialDriver. * @note This function bypasses the indirect access to the channel and * checks directly the input queue. This is faster but cannot * be used to check different channels implementations. * * @deprecated * * @api */ #define sdGetWouldBlock(sdp) iqIsEmptyI(&(sdp)->iqueue) /** * @brief Direct write to a @p SerialDriver. * @note This function bypasses the indirect access to the channel and * writes directly on the output queue. This is faster but cannot * be used to write to different channels implementations. * * @see chnPutTimeout() * * @api */ #define sdPut(sdp, b) oqPut(&(sdp)->oqueue, b) /** * @brief Direct write to a @p SerialDriver with timeout specification. * @note This function bypasses the indirect access to the channel and * writes directly on the output queue. This is faster but cannot * be used to write to different channels implementations. * * @see chnPutTimeout() * * @api */ #define sdPutTimeout(sdp, b, t) oqPutTimeout(&(sdp)->oqueue, b, t) /** * @brief Direct read from a @p SerialDriver. * @note This function bypasses the indirect access to the channel and * reads directly from the input queue. This is faster but cannot * be used to read from different channels implementations. * * @see chnGetTimeout() * * @api */ #define sdGet(sdp) iqGet(&(sdp)->iqueue) /** * @brief Direct read from a @p SerialDriver with timeout specification. * @note This function bypasses the indirect access to the channel and * reads directly from the input queue. This is faster but cannot * be used to read from different channels implementations. * * @see chnGetTimeout() * * @api */ #define sdGetTimeout(sdp, t) iqGetTimeout(&(sdp)->iqueue, t) /** * @brief Direct blocking write to a @p SerialDriver. * @note This function bypasses the indirect access to the channel and * writes directly to the output queue. This is faster but cannot * be used to write from different channels implementations. * * @see chnWrite() * * @api */ #define sdWrite(sdp, b, n) \ oqWriteTimeout(&(sdp)->oqueue, b, n, TIME_INFINITE) /** * @brief Direct blocking write to a @p SerialDriver with timeout * specification. * @note This function bypasses the indirect access to the channel and * writes directly to the output queue. This is faster but cannot * be used to write to different channels implementations. * * @see chnWriteTimeout() * * @api */ #define sdWriteTimeout(sdp, b, n, t) \ oqWriteTimeout(&(sdp)->oqueue, b, n, t) /** * @brief Direct non-blocking write to a @p SerialDriver. * @note This function bypasses the indirect access to the channel and * writes directly to the output queue. This is faster but cannot * be used to write to different channels implementations. * * @see chnWriteTimeout() * * @api */ #define sdAsynchronousWrite(sdp, b, n) \ oqWriteTimeout(&(sdp)->oqueue, b, n, TIME_IMMEDIATE) /** * @brief Direct blocking read from a @p SerialDriver. * @note This function bypasses the indirect access to the channel and * reads directly from the input queue. This is faster but cannot * be used to read from different channels implementations. * * @see chnRead() * * @api */ #define sdRead(sdp, b, n) \ iqReadTimeout(&(sdp)->iqueue, b, n, TIME_INFINITE) /** * @brief Direct blocking read from a @p SerialDriver with timeout * specification. * @note This function bypasses the indirect access to the channel and * reads directly from the input queue. This is faster but cannot * be used to read from different channels implementations. * * @see chnReadTimeout() * * @api */ #define sdReadTimeout(sdp, b, n, t) \ iqReadTimeout(&(sdp)->iqueue, b, n, t) /** * @brief Direct non-blocking read from a @p SerialDriver. * @note This function bypasses the indirect access to the channel and * reads directly from the input queue. This is faster but cannot * be used to read from different channels implementations. * * @see chnReadTimeout() * * @api */ #define sdAsynchronousRead(sdp, b, n) \ iqReadTimeout(&(sdp)->iqueue, b, n, TIME_IMMEDIATE) /** @} */ /*===========================================================================*/ /* External declarations. */ /*===========================================================================*/ #ifdef __cplusplus extern "C" { #endif void sdInit(void); void sdObjectInit(SerialDriver *sdp, qnotify_t inotify, qnotify_t onotify); void sdStart(SerialDriver *sdp, const SerialConfig *config); void sdStop(SerialDriver *sdp); void sdIncomingDataI(SerialDriver *sdp, uint8_t b); msg_t sdRequestDataI(SerialDriver *sdp); #ifdef __cplusplus } #endif #endif /* HAL_USE_SERIAL == TRUE */ #endif /* _SERIAL_H_ */ /** @} */


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