Struct kfifo

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August undefined, 2024

WebAug 9, 2009 · This is a series of patches which makes the kfifo API more generic. This patch does reorganize the current kfifo to be ready for extensions. The following changes are applied: - move out spinlock of the struct kfifo because most users don't need it - struct kfifo not longer be dynamically allocated. - replace kfifo_put () by kfifo_put_locked ... WebStruct Finance is a new DeFi protocol that offers a way for users to customize interest-rate tranches and compose them with options available in the ecosystem to construct …

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Webkfifo int kfifo_alloc(struct kfifo *fifo, unsigned int size, gfp_t gfp_mask) Creates a kfifo size must be a power of two static inline void kfifo_reset(struct kfifo *fifo) Removes all contents from the queue void kfifo_free(struct kfifo *fifo) Destroys the queue WebJun 12, 2012 · kfifo 定义在 include/linux/kfifo.h 头文件中，我们经常使用的就是 kfifo 结构，看看它的定义： struct kfifo { unsigned char *buffer; /* the buffer holding the data */ unsigned int size; /* the size of the allocated buffer */ unsigned int in; /* data is added at offset (in % size) */ unsigned int out; /* data is extracted from off. (out % size) */ }; burt peterson reddit

Device Drivers — The Linux Kernel documentation

Web13.12.2009 First implementation of a type safe fifo implementation, called kqueue There are different types of a fifo which can not handled in C without a lot of overhead. So i decided to write the API as a set of macros, which is the only way to do a kind of template meta programming without C++. Webkfifo int kfifo_alloc(struct kfifo *fifo, unsigned int size, gfp_t gfp_mask) Creates a kfifo size must be a power of two static inline void kfifo_reset(struct kfifo *fifo) Removes all … burt pen testing

Linux-Kernel Archive: Re: [RFC, 2.6] a simple FIFO implementation

Webstruct kfifo_rec_ptr_2 __STRUCT_KFIFO_PTR(unsigned char, 2, void); 96: 97 /* 98 * helper macro to distinguish between real in place fifo where the fifo: 99 * array is a part of the structure and the fifo type where the array is: 100 * outside of the fifo structure. 101 */ 102: #define __is_kfifo_ptr(fifo) \ 103 WebDec 6, 2024 · Recently, I found that in variable within struct __kfifo keeps increasing and is being used just by applying bitwise-AND operation with mask right before its use. However, it seems like the enqueue function(__kfifo_in) is not … hampton roads chess clubWeb@@ -146,12 +146,12 @@ struct kfifo_rec_ptr_2 __STRUCT_KFIFO_PTR(unsigned char, 2); * DEFINE_KFIFO - macro to define and initialize a fifo * @fifo: name of the declared fifo datatype * @type: type of the fifo elements - * @size: the number of elements in the fifo, this must be a power of 2 burt parks scandal

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Struct kfifo

Linux-Kernel Archive: [RFC] kfifo writer side lock-less support - IU

WebApr 11, 2024 · 该函数创建并分配一个大小为size的KFIFO环形缓冲区。第一个参数fifo是指向该环形缓冲区的struct kfifo数据结构；第二个参数size是指定缓冲区元素的数量；第三个 … WebImplementation-wise, the head and tail indices should *not* be constrained to be less than the size of the buffer. They should be allowed to wrap all the way back to zero. This allows you to distinguish between the completely-empty and completely-full states while using 100% of the storage.

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WebApr 11, 2024 · 该函数创建并分配一个大小为size的KFIFO环形缓冲区。第一个参数fifo是指向该环形缓冲区的struct kfifo数据结构；第二个参数size是指定缓冲区元素的数量；第三个参数gfp_mask表示分配KFIFO元素使用的分配掩码。静态分配可以使用如下的宏。 Webfifo = kmalloc (sizeof (struct kfifo), gfp_mask); if (!fifo) return ERR_PTR (-ENOMEM); fifo->buffer = buffer; fifo->size = size; fifo->in = fifo->out = 0; fifo->lock = lock; return fifo; } EXPORT_SYMBOL (kfifo_init); /** * kfifo_alloc - allocates a new FIFO and its internal buffer * @size: the size of the internal buffer to be allocated.

WebDec 6, 2024 · 1. I am currently trying to study things related to Linux Queue implementation (kfifo). Recently, I found that in variable within struct __kfifo keeps increasing and is being … Web+extern struct kfifo *kfifo_alloc(unsigned int size, int gfp_mask); +extern void kfifo_free(struct kfifo *fifo); +extern void __kfifo_reset(struct kfifo *fifo); +extern unsigned int __kfifo_put(struct kfifo *fifo, + unsigned char *buffer, unsigned int len); +extern unsigned int __kfifo_get(struct kfifo *fifo,

WebOnce the object has been registered, it may access the common fields of the object, like the lock and the list of devices: int driver_for_each_dev (struct device_driver *drv, void *data, int (*callback) (struct device *dev, void *data)); The devices field is a list of all the devices that have been bound to the driver. WebAug 12, 2024 · On media, we now have an struct declared with: struct lirc_fh { struct list_head list; struct rc_dev *rc; int carrier_low; bool send_timeout_reports; DECLARE_KFIFO_PTR(rawir, unsigned int); DECLARE_KFIFO_PTR(scancodes, struct lirc_scancode); wait_queue_head_t wait_poll; u8 send_mode; u8 rec_mode; }; gpiolib.c has …

Web69 static int iio_get_bytes_per_datum_kfifo(struct iio_buffer *r) 70 {71 return r->bytes_per_datum; 72} 73. 74 static int iio_mark_update_needed_kfifo(struct iio_buffer *r) 75 {76 struct iio_kfifo *kf = iio_to_kfifo(r); 77 kf->update_needed = true; 78 ...

WebApr 16, 2012 · Linux kfifo uses the last approach (bitwise masking), which is why it always ensures that the capacity is a power of two inside the init function ( size = roundup_pow_of_two (size) ). However, it does not reset the indices as soon as they change, but rather masks them on each access to the buffer: hampton roads chiro scott olneyWebstatic DEFINE_MUTEX (write_lock); /* * struct kfifo_rec_ptr_1 and STRUCT_KFIFO_REC_1 can handle records of a * length between 0 and 255 bytes. * * struct kfifo_rec_ptr_2 and … hampton roads car care hampton vaWeb70 static int iio_get_bytes_per_datum_kfifo(struct iio_buffer *r) 71 {72 return r->bytes_per_datum; 73} 74. 75 static int iio_mark_update_needed_kfifo(struct iio_buffer *r) 76 {77 struct iio_kfifo *kf = iio_to_kfifo(r); 78 kf->update_needed = true; 79 ... bur tphv cuaWebHi. I just added support for user space buffers in kfifo. I found useful __kfifo_get_user to copy data to a user buffer in a read call. I didn't burt phelpsWebNov 13, 2024 · 一、kfifo概述 kfifo是一种"First In First Out "数据结构，它采用了前面提到的环形缓冲区来实现，提供一个无边界的字节流服务。采用环形缓冲区的好处为，当一个数据元素被用掉后，其余数据元素不需要移动其存储位置，从而减少拷贝提高效率。更重要的是，kfifo采用了并行无锁技术，kfifo实现的单生产 ... burt phillipsWebApr 11, 2024 · 新的驱动在代码第15行定义并初始化了一个名叫 vsfifo 的 struct kfifo 对象，每个元素的数据类型为char，共有32个元素的空间。代码第17行到第25行设备打开和关闭函数，分别对应于file_operations 内的open和release 方法。因为是虚拟设备，所以这里并没有需要特别处理的 ... burt peopleWebApr 19, 2013 · #define kfifo_initialized (fifo) ( (fifo)->kfifo.mask) could be also used on the left side of some assignment (even if you probably should not do that). And it is shorter to … hampton roads car show