X-Git-Url: http://git.lttng.org/?p=lttng-ust.git;a=blobdiff_plain;f=libringbuffer%2Ffrontend.h;h=bac86d17cdbcdd925637e114f5ab2eadb7dc44ef;hp=a88a400395cde93aeeecdea3f6dcfbcb39167bce;hb=c0c0989ab70574e09b2f7e8b48c2da6af664a849;hpb=193183fb924aef705f30358e54e7386a3a64c78d diff --git a/libringbuffer/frontend.h b/libringbuffer/frontend.h index a88a4003..bac86d17 100644 --- a/libringbuffer/frontend.h +++ b/libringbuffer/frontend.h @@ -1,21 +1,19 @@ -#ifndef _LINUX_RING_BUFFER_FRONTEND_H -#define _LINUX_RING_BUFFER_FRONTEND_H - /* - * linux/ringbuffer/frontend.h + * SPDX-License-Identifier: LGPL-2.1-only * - * (C) Copyright 2005-2010 - Mathieu Desnoyers + * Copyright (C) 2005-2012 Mathieu Desnoyers * * Ring Buffer Library Synchronization Header (API). * - * Author: - * Mathieu Desnoyers - * * See ring_buffer_frontend.c for more information on wait-free algorithms. - * - * Dual LGPL v2.1/GPL v2 license. */ +#ifndef _LTTNG_RING_BUFFER_FRONTEND_H +#define _LTTNG_RING_BUFFER_FRONTEND_H + +#include +#include + #include #include @@ -34,35 +32,34 @@ * buf_addr is a pointer the the beginning of the preallocated buffer contiguous * address mapping. It is used only by RING_BUFFER_STATIC configuration. It can * be set to NULL for other backends. + * + * priv_data (output) is set to a pointer into a "priv_data_len"-sized + * memory area for client-specific data. This memory is managed by lib + * ring buffer. priv_data_align is the alignment required for the + * private data area. */ extern -struct shm_handle *channel_create(const struct lib_ring_buffer_config *config, - const char *name, void *priv, +struct lttng_ust_shm_handle *channel_create(const struct lttng_ust_lib_ring_buffer_config *config, + const char *name, + void **priv_data, + size_t priv_data_align, + size_t priv_data_size, + void *priv_data_init, void *buf_addr, size_t subbuf_size, size_t num_subbuf, unsigned int switch_timer_interval, unsigned int read_timer_interval, - int *shm_fd, int *wait_fd, - uint64_t *memory_map_size); - -/* channel_handle_create - for consumer. */ -extern -struct shm_handle *channel_handle_create(int shm_fd, int wait_fd, - uint64_t memory_map_size); - -/* channel_handle_add_stream - for consumer. */ -extern -int channel_handle_add_stream(struct shm_handle *handle, - int shm_fd, int wait_fd, uint64_t memory_map_size); + const int *stream_fds, int nr_stream_fds, + int64_t blocking_timeout); /* - * channel_destroy returns the private data pointer. It finalizes all channel's - * buffers, waits for readers to release all references, and destroys the - * channel. + * channel_destroy finalizes all channel's buffers, waits for readers to + * release all references, and destroys the channel. */ extern -void *channel_destroy(struct channel *chan, struct shm_handle *handle); +void channel_destroy(struct channel *chan, struct lttng_ust_shm_handle *handle, + int consumer); /* Buffer read operations */ @@ -76,40 +73,71 @@ void *channel_destroy(struct channel *chan, struct shm_handle *handle); #define for_each_channel_cpu(cpu, chan) \ for_each_possible_cpu(cpu) -extern struct lib_ring_buffer *channel_get_ring_buffer( - const struct lib_ring_buffer_config *config, +extern struct lttng_ust_lib_ring_buffer *channel_get_ring_buffer( + const struct lttng_ust_lib_ring_buffer_config *config, struct channel *chan, int cpu, - struct shm_handle *handle, + struct lttng_ust_shm_handle *handle, int *shm_fd, int *wait_fd, + int *wakeup_fd, uint64_t *memory_map_size); -extern int lib_ring_buffer_open_read(struct lib_ring_buffer *buf, - struct shm_handle *handle); -extern void lib_ring_buffer_release_read(struct lib_ring_buffer *buf, - struct shm_handle *handle); +extern +int ring_buffer_channel_close_wait_fd(const struct lttng_ust_lib_ring_buffer_config *config, + struct channel *chan, + struct lttng_ust_shm_handle *handle); +extern +int ring_buffer_channel_close_wakeup_fd(const struct lttng_ust_lib_ring_buffer_config *config, + struct channel *chan, + struct lttng_ust_shm_handle *handle); +extern +int ring_buffer_stream_close_wait_fd(const struct lttng_ust_lib_ring_buffer_config *config, + struct channel *chan, + struct lttng_ust_shm_handle *handle, + int cpu); +extern +int ring_buffer_stream_close_wakeup_fd(const struct lttng_ust_lib_ring_buffer_config *config, + struct channel *chan, + struct lttng_ust_shm_handle *handle, + int cpu); + +extern int lib_ring_buffer_open_read(struct lttng_ust_lib_ring_buffer *buf, + struct lttng_ust_shm_handle *handle); +extern void lib_ring_buffer_release_read(struct lttng_ust_lib_ring_buffer *buf, + struct lttng_ust_shm_handle *handle); + +/* + * Initialize signals for ring buffer. Should be called early e.g. by + * main() in the program to affect all threads. + */ +void lib_ringbuffer_signal_init(void); /* * Read sequence: snapshot, many get_subbuf/put_subbuf, move_consumer. */ -extern int lib_ring_buffer_snapshot(struct lib_ring_buffer *buf, +extern int lib_ring_buffer_snapshot(struct lttng_ust_lib_ring_buffer *buf, unsigned long *consumed, unsigned long *produced, - struct shm_handle *handle); -extern void lib_ring_buffer_move_consumer(struct lib_ring_buffer *buf, + struct lttng_ust_shm_handle *handle); +extern int lib_ring_buffer_snapshot_sample_positions( + struct lttng_ust_lib_ring_buffer *buf, + unsigned long *consumed, + unsigned long *produced, + struct lttng_ust_shm_handle *handle); +extern void lib_ring_buffer_move_consumer(struct lttng_ust_lib_ring_buffer *buf, unsigned long consumed_new, - struct shm_handle *handle); + struct lttng_ust_shm_handle *handle); -extern int lib_ring_buffer_get_subbuf(struct lib_ring_buffer *buf, +extern int lib_ring_buffer_get_subbuf(struct lttng_ust_lib_ring_buffer *buf, unsigned long consumed, - struct shm_handle *handle); -extern void lib_ring_buffer_put_subbuf(struct lib_ring_buffer *buf, - struct shm_handle *handle); + struct lttng_ust_shm_handle *handle); +extern void lib_ring_buffer_put_subbuf(struct lttng_ust_lib_ring_buffer *buf, + struct lttng_ust_shm_handle *handle); /* * lib_ring_buffer_get_next_subbuf/lib_ring_buffer_put_next_subbuf are helpers * to read sub-buffers sequentially. */ -static inline int lib_ring_buffer_get_next_subbuf(struct lib_ring_buffer *buf, - struct shm_handle *handle) +static inline int lib_ring_buffer_get_next_subbuf(struct lttng_ust_lib_ring_buffer *buf, + struct lttng_ust_shm_handle *handle) { int ret; @@ -122,28 +150,33 @@ static inline int lib_ring_buffer_get_next_subbuf(struct lib_ring_buffer *buf, } static inline -void lib_ring_buffer_put_next_subbuf(struct lib_ring_buffer *buf, - struct shm_handle *handle) +void lib_ring_buffer_put_next_subbuf(struct lttng_ust_lib_ring_buffer *buf, + struct lttng_ust_shm_handle *handle) { + struct channel *chan; + + chan = shmp(handle, buf->backend.chan); + if (!chan) + return; lib_ring_buffer_put_subbuf(buf, handle); - lib_ring_buffer_move_consumer(buf, subbuf_align(buf->cons_snapshot, - shmp(handle, buf->backend.chan)), handle); + lib_ring_buffer_move_consumer(buf, subbuf_align(buf->cons_snapshot, chan), + handle); } extern void channel_reset(struct channel *chan); -extern void lib_ring_buffer_reset(struct lib_ring_buffer *buf, - struct shm_handle *handle); +extern void lib_ring_buffer_reset(struct lttng_ust_lib_ring_buffer *buf, + struct lttng_ust_shm_handle *handle); static inline -unsigned long lib_ring_buffer_get_offset(const struct lib_ring_buffer_config *config, - struct lib_ring_buffer *buf) +unsigned long lib_ring_buffer_get_offset(const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer *buf) { return v_read(config, &buf->offset); } static inline -unsigned long lib_ring_buffer_get_consumed(const struct lib_ring_buffer_config *config, - struct lib_ring_buffer *buf) +unsigned long lib_ring_buffer_get_consumed(const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer *buf) { return uatomic_read(&buf->consumed); } @@ -153,8 +186,8 @@ unsigned long lib_ring_buffer_get_consumed(const struct lib_ring_buffer_config * * ordering enforced with respect to trace teardown). */ static inline -int lib_ring_buffer_is_finalized(const struct lib_ring_buffer_config *config, - struct lib_ring_buffer *buf) +int lib_ring_buffer_is_finalized(const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer *buf) { int finalized = CMM_ACCESS_ONCE(buf->finalized); /* @@ -178,59 +211,59 @@ int lib_ring_buffer_channel_is_disabled(const struct channel *chan) static inline unsigned long lib_ring_buffer_get_read_data_size( - const struct lib_ring_buffer_config *config, - struct lib_ring_buffer *buf, - struct shm_handle *handle) + const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer *buf, + struct lttng_ust_shm_handle *handle) { return subbuffer_get_read_data_size(config, &buf->backend, handle); } static inline unsigned long lib_ring_buffer_get_records_count( - const struct lib_ring_buffer_config *config, - struct lib_ring_buffer *buf) + const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer *buf) { return v_read(config, &buf->records_count); } static inline unsigned long lib_ring_buffer_get_records_overrun( - const struct lib_ring_buffer_config *config, - struct lib_ring_buffer *buf) + const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer *buf) { return v_read(config, &buf->records_overrun); } static inline unsigned long lib_ring_buffer_get_records_lost_full( - const struct lib_ring_buffer_config *config, - struct lib_ring_buffer *buf) + const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer *buf) { return v_read(config, &buf->records_lost_full); } static inline unsigned long lib_ring_buffer_get_records_lost_wrap( - const struct lib_ring_buffer_config *config, - struct lib_ring_buffer *buf) + const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer *buf) { return v_read(config, &buf->records_lost_wrap); } static inline unsigned long lib_ring_buffer_get_records_lost_big( - const struct lib_ring_buffer_config *config, - struct lib_ring_buffer *buf) + const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer *buf) { return v_read(config, &buf->records_lost_big); } static inline unsigned long lib_ring_buffer_get_records_read( - const struct lib_ring_buffer_config *config, - struct lib_ring_buffer *buf) + const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer *buf) { return v_read(config, &buf->backend.records_read); } -#endif /* _LINUX_RING_BUFFER_FRONTEND_H */ +#endif /* _LTTNG_RING_BUFFER_FRONTEND_H */