X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=libringbuffer%2Ffrontend.h;h=de924a0a8af8f090ed9e1caf9ecb61d02da17b2c;hb=35c1f459092b630dd2825450014e27c84b31ddee;hp=993a391730d7ab7a3518301a27fcd12711982d6b;hpb=a3f61e7f689a5fc60b833a773f462989dc6cc78f;p=lttng-ust.git diff --git a/libringbuffer/frontend.h b/libringbuffer/frontend.h index 993a3917..de924a0a 100644 --- a/libringbuffer/frontend.h +++ b/libringbuffer/frontend.h @@ -1,25 +1,24 @@ -#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 #include "smp.h" + /* Internal helpers */ #include "frontend_internal.h" @@ -41,36 +40,30 @@ * private data area. */ +__attribute__((visibility("hidden"))) extern 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 lttng_ust_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 lttng_ust_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 finalizes all channel's buffers, waits for readers to * release all references, and destroys the channel. */ +__attribute__((visibility("hidden"))) extern -void channel_destroy(struct channel *chan, struct lttng_ust_shm_handle *handle, - int shadow); +void channel_destroy(struct lttng_ust_lib_ring_buffer_channel *chan, + struct lttng_ust_shm_handle *handle, + int consumer); /* Buffer read operations */ @@ -84,33 +77,82 @@ void channel_destroy(struct channel *chan, struct lttng_ust_shm_handle *handle, #define for_each_channel_cpu(cpu, chan) \ for_each_possible_cpu(cpu) +__attribute__((visibility("hidden"))) 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 lttng_ust_lib_ring_buffer_channel *chan, int cpu, struct lttng_ust_shm_handle *handle, int *shm_fd, int *wait_fd, + int *wakeup_fd, uint64_t *memory_map_size); + +__attribute__((visibility("hidden"))) +extern +int ring_buffer_channel_close_wait_fd(const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer_channel *chan, + struct lttng_ust_shm_handle *handle); + +__attribute__((visibility("hidden"))) +extern +int ring_buffer_channel_close_wakeup_fd(const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer_channel *chan, + struct lttng_ust_shm_handle *handle); + +__attribute__((visibility("hidden"))) +extern +int ring_buffer_stream_close_wait_fd(const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer_channel *chan, + struct lttng_ust_shm_handle *handle, + int cpu); + +__attribute__((visibility("hidden"))) +extern +int ring_buffer_stream_close_wakeup_fd(const struct lttng_ust_lib_ring_buffer_config *config, + struct lttng_ust_lib_ring_buffer_channel *chan, + struct lttng_ust_shm_handle *handle, + int cpu); + +__attribute__((visibility("hidden"))) extern int lib_ring_buffer_open_read(struct lttng_ust_lib_ring_buffer *buf, - struct lttng_ust_shm_handle *handle, - int shadow); + struct lttng_ust_shm_handle *handle); + +__attribute__((visibility("hidden"))) extern void lib_ring_buffer_release_read(struct lttng_ust_lib_ring_buffer *buf, - struct lttng_ust_shm_handle *handle, - int shadow); + 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. + */ +__attribute__((visibility("hidden"))) +void lib_ringbuffer_signal_init(void); /* * Read sequence: snapshot, many get_subbuf/put_subbuf, move_consumer. */ +__attribute__((visibility("hidden"))) extern int lib_ring_buffer_snapshot(struct lttng_ust_lib_ring_buffer *buf, unsigned long *consumed, unsigned long *produced, struct lttng_ust_shm_handle *handle); + +__attribute__((visibility("hidden"))) +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); + +__attribute__((visibility("hidden"))) extern void lib_ring_buffer_move_consumer(struct lttng_ust_lib_ring_buffer *buf, unsigned long consumed_new, struct lttng_ust_shm_handle *handle); +__attribute__((visibility("hidden"))) extern int lib_ring_buffer_get_subbuf(struct lttng_ust_lib_ring_buffer *buf, unsigned long consumed, struct lttng_ust_shm_handle *handle); +__attribute__((visibility("hidden"))) extern void lib_ring_buffer_put_subbuf(struct lttng_ust_lib_ring_buffer *buf, struct lttng_ust_shm_handle *handle); @@ -135,12 +177,20 @@ static inline void lib_ring_buffer_put_next_subbuf(struct lttng_ust_lib_ring_buffer *buf, struct lttng_ust_shm_handle *handle) { + struct lttng_ust_lib_ring_buffer_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); +__attribute__((visibility("hidden"))) +extern void channel_reset(struct lttng_ust_lib_ring_buffer_channel *chan); + +__attribute__((visibility("hidden"))) extern void lib_ring_buffer_reset(struct lttng_ust_lib_ring_buffer *buf, struct lttng_ust_shm_handle *handle); @@ -175,13 +225,13 @@ int lib_ring_buffer_is_finalized(const struct lttng_ust_lib_ring_buffer_config * } static inline -int lib_ring_buffer_channel_is_finalized(const struct channel *chan) +int lib_ring_buffer_channel_is_finalized(const struct lttng_ust_lib_ring_buffer_channel *chan) { return chan->finalized; } static inline -int lib_ring_buffer_channel_is_disabled(const struct channel *chan) +int lib_ring_buffer_channel_is_disabled(const struct lttng_ust_lib_ring_buffer_channel *chan) { return uatomic_read(&chan->record_disabled); } @@ -243,4 +293,4 @@ unsigned long lib_ring_buffer_get_records_read( return v_read(config, &buf->backend.records_read); } -#endif /* _LINUX_RING_BUFFER_FRONTEND_H */ +#endif /* _LTTNG_RING_BUFFER_FRONTEND_H */