The FreeRADIUS server  $Id: 15bac2a4c627c01d1aa2047687b3418955ac7f00 $
Data Structures | Macros | Functions | Variables
worker.c File Reference

Worker thread functions. More...

#include <freeradius-devel/io/channel.h>
#include <freeradius-devel/io/listen.h>
#include <freeradius-devel/io/message.h>
#include <freeradius-devel/io/worker.h>
#include <freeradius-devel/unlang/base.h>
#include <freeradius-devel/unlang/call.h>
#include <freeradius-devel/unlang/interpret.h>
#include <freeradius-devel/server/request.h>
#include <freeradius-devel/server/time_tracking.h>
#include <freeradius-devel/util/dlist.h>
#include <freeradius-devel/util/minmax_heap.h>
#include <stdalign.h>
+ Include dependency graph for worker.c:

Go to the source code of this file.

Data Structures

struct  fr_worker_channel_t
 
struct  fr_worker_listen_t
 
struct  fr_worker_s
 A worker which takes packets from a master, and processes them. More...
 

Macros

#define CACHE_LINE_SIZE   64
 
#define CHECK_CONFIG(_x, _min, _max)
 
#define CHECK_CONFIG_TIME_DELTA(_x, _min, _max)
 
#define LOG_DST   worker->log
 
#define LOG_PREFIX   worker->name
 
#define WORKER_VERIFY
 

Functions

static int _fr_worker_rb_free (void *arg)
 
static void _worker_request_detach (request_t *request, void *uctx)
 Make us responsible for running the request. More...
 
static void _worker_request_done_detached (request_t *request, UNUSED rlm_rcode_t rcode, void *uctx)
 Detached request (i.e. More...
 
static void _worker_request_done_external (request_t *request, UNUSED rlm_rcode_t rcode, void *uctx)
 External request is now complete. More...
 
static void _worker_request_done_internal (request_t *request, UNUSED rlm_rcode_t rcode, void *uctx)
 Internal request (i.e. More...
 
static void _worker_request_internal_init (request_t *request, void *uctx)
 Internal request (i.e. More...
 
static void _worker_request_resume (request_t *request, UNUSED void *uctx)
 Interpreter is starting to work on request again. More...
 
static void _worker_request_runnable (request_t *request, void *uctx)
 Request is now runnable. More...
 
static bool _worker_request_scheduled (request_t const *request, UNUSED void *uctx)
 Check if a request is scheduled. More...
 
static void _worker_request_stop (request_t *request, void *uctx)
 This is called by the interpreter when it wants to stop a request. More...
 
static void _worker_request_yield (request_t *request, UNUSED void *uctx)
 Interpreter yielded request. More...
 
static int cmd_stats_worker (FILE *fp, UNUSED FILE *fp_err, void *ctx, fr_cmd_info_t const *info)
 
void fr_worker (fr_worker_t *worker)
 The main loop and entry point of the stand-alone worker thread. More...
 
fr_channel_tfr_worker_channel_create (fr_worker_t *worker, TALLOC_CTX *ctx, fr_control_t *master)
 Create a channel to the worker. More...
 
fr_worker_tfr_worker_create (TALLOC_CTX *ctx, fr_event_list_t *el, char const *name, fr_log_t const *logger, fr_log_lvl_t lvl, fr_worker_config_t *config)
 Create a worker. More...
 
void fr_worker_debug (fr_worker_t *worker, FILE *fp)
 Print debug information about the worker structure. More...
 
void fr_worker_destroy (fr_worker_t *worker)
 Destroy a worker. More...
 
int fr_worker_listen_cancel (fr_worker_t *worker, fr_listen_t const *li)
 
static int fr_worker_listen_cancel_self (fr_worker_t *worker, fr_listen_t const *li)
 
void fr_worker_post_event (UNUSED fr_event_list_t *el, UNUSED fr_time_t now, void *uctx)
 Post-event handler. More...
 
int fr_worker_pre_event (UNUSED fr_time_t now, UNUSED fr_time_delta_t wake, void *uctx)
 Pre-event handler. More...
 
static fr_ring_buffer_tfr_worker_rb_init (void)
 Initialise thread local storage. More...
 
int fr_worker_stats (fr_worker_t const *worker, int num, uint64_t *stats)
 
static bool is_worker_thread (fr_worker_t const *worker)
 
static char * itoa_internal (TALLOC_CTX *ctx, uint64_t number)
 
static void worker_channel_callback (void *ctx, void const *data, size_t data_size, fr_time_t now)
 Handle a control plane message sent to the worker via a channel. More...
 
static int8_t worker_dedup_cmp (void const *one, void const *two)
 Track a request_t in the "dedup" tree. More...
 
static void worker_exit (fr_worker_t *worker)
 
static void worker_listen_cancel_callback (void *ctx, void const *data, NDEBUG_UNUSED size_t data_size, UNUSED fr_time_t now)
 A socket is going away, so clean up any requests which use this socket. More...
 
static int8_t worker_listener_cmp (void const *one, void const *two)
 
static void worker_max_request_time (UNUSED fr_event_list_t *el, UNUSED fr_time_t when, void *uctx)
 Enforce max_request_time. More...
 
static void worker_max_request_timer (fr_worker_t *worker)
 See when we next need to service the time_order heap for "too old" packets. More...
 
static void worker_nak (fr_worker_t *worker, fr_channel_data_t *cd, fr_time_t now)
 Send a NAK to the network thread. More...
 
static void worker_recv_request (void *ctx, fr_channel_t *ch, fr_channel_data_t *cd)
 Callback which handles a message being received on the worker side. More...
 
static void worker_request_bootstrap (fr_worker_t *worker, fr_channel_data_t *cd, fr_time_t now)
 
static void worker_request_init (fr_worker_t *worker, request_t *request, fr_time_t now)
 Initialize various request fields needed by the worker. More...
 
static void worker_request_name_number (request_t *request)
 
static void worker_request_time_tracking_end (fr_worker_t *worker, request_t *request, fr_time_t now)
 
static void worker_request_time_tracking_start (fr_worker_t *worker, request_t *request, fr_time_t now)
 Start time tracking for a request, and mark it as runnable. More...
 
static void worker_requests_cancel (fr_worker_channel_t *ch)
 
static void worker_run_request (fr_worker_t *worker, fr_time_t start)
 Run a request. More...
 
static int8_t worker_runnable_cmp (void const *one, void const *two)
 Track a request_t in the "runnable" heap. More...
 
static void worker_send_reply (fr_worker_t *worker, request_t *request, bool send_reply, fr_time_t now)
 Send a response packet to the network side. More...
 
static void worker_stop_request (request_t **request_p)
 Signal the unlang interpreter that it needs to stop running the request. More...
 
static int8_t worker_time_order_cmp (void const *one, void const *two)
 Track a request_t in the "time_order" heap. More...
 

Variables

fr_cmd_table_t cmd_worker_table []
 
static _Thread_local fr_ring_buffer_tfr_worker_rb
 
static atomic_uint64_t request_number = 0
 

Detailed Description

Worker thread functions.

Id
eadb77c5c36479ee4283ee4647cc92cde9ff0736

The "worker" thread is the one responsible for the bulk of the work done when processing a request. Workers are spawned by the scheduler, and create a kqueue (KQ) and control-plane Atomic Queue (AQ) for control-plane communication.

When a network thread discovers that it needs more workers, it asks the scheduler for a KQ/AQ combination. The network thread then creates a channel dedicated to that worker, and sends the channel to the worker in a "new channel" message. The worker receives the channel, and sends an ACK back to the network thread.

The network thread then sends the worker new packets, which the worker receives and processes.

When a packet is decoded, it is put into the "runnable" heap, and also into the "time_order" heap. The main loop fr_worker() then pulls new requests off of this heap and runs them. The worker_check_timeouts() function also checks the tail of the "time_order" heap, and ages out requests which have been active for "too long".

If a request is yielded, it is placed onto the yielded list in the worker "tracking" data structure.

Definition in file worker.c.


Data Structure Documentation

◆ fr_worker_channel_t

struct fr_worker_channel_t

Definition at line 81 of file worker.c.

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Data Fields
fr_channel_t * ch
fr_dlist_head_t dlist

◆ fr_worker_listen_t

struct fr_worker_listen_t

Definition at line 139 of file worker.c.

+ Collaboration diagram for fr_worker_listen_t:
Data Fields
fr_dlist_head_t dlist of requests associated with this listener.
fr_listen_t const * listener incoming packets
fr_rb_node_t node in tree of listeners

◆ fr_worker_s

struct fr_worker_s

A worker which takes packets from a master, and processes them.

Definition at line 94 of file worker.c.

+ Collaboration diagram for fr_worker_s:
Data Fields
fr_atomic_queue_t * aq_control atomic queue for control messages sent to me
fr_worker_channel_t * channel list of channels
fr_time_t checked_timeout when we last checked the tails of the queues
fr_worker_config_t config external configuration
fr_control_t * control the control plane
fr_time_elapsed_t cpu_time histogram of total CPU time per request
fr_rb_tree_t * dedup de-dup tree
fr_event_list_t * el our event list
fr_event_timer_t const * ev_cleanup timer for max_request_time
bool exiting are we exiting?
unlang_interpret_t * intp Worker's local interpreter.
fr_rb_tree_t * listeners so we can cancel requests when a listener goes away
fr_log_t const * log log destination
fr_log_lvl_t lvl log level
char const * name name of this worker
uint64_t num_active number of active requests
int num_channels actual number of channels
uint64_t num_naks number of messages which were nak'd
fr_time_delta_t predicted How long we predict a request will take to execute.
fr_heap_t * runnable current runnable requests which we've spent time processing
fr_io_stats_t stats input / output stats
pthread_t thread_id my thread ID
fr_minmax_heap_t * time_order time ordered heap of requests
fr_time_tracking_t tracking how much time the worker has spent doing things.
fr_time_elapsed_t wall_clock histogram of wall clock time per request
bool was_sleeping used to suppress multiple sleep signals in a row

Macro Definition Documentation

◆ CACHE_LINE_SIZE

#define CACHE_LINE_SIZE   64

Definition at line 76 of file worker.c.

◆ CHECK_CONFIG

#define CHECK_CONFIG (   _x,
  _min,
  _max 
)
Value:
do { \
if (!worker->config._x) worker->config._x = _min; \
if (worker->config._x < _min) worker->config._x = _min; \
if (worker->config._x > _max) worker->config._x = _max; \
} while (0)
while(1)
Definition: acutest.h:856
if(rcode > 0)
Definition: fd_read.h:9
static const conf_parser_t config[]
Definition: base.c:183

◆ CHECK_CONFIG_TIME_DELTA

#define CHECK_CONFIG_TIME_DELTA (   _x,
  _min,
  _max 
)
Value:
do { \
if (fr_time_delta_lt(worker->config._x, _min)) worker->config._x = _min; \
if (fr_time_delta_gt(worker->config._x, _max)) worker->config._x = _max; \
} while (0)
#define fr_time_delta_lt(_a, _b)
Definition: time.h:285
#define fr_time_delta_gt(_a, _b)
Definition: time.h:283

◆ LOG_DST

#define LOG_DST   worker->log

Definition at line 53 of file worker.c.

◆ LOG_PREFIX

#define LOG_PREFIX   worker->name

Definition at line 52 of file worker.c.

◆ WORKER_VERIFY

#define WORKER_VERIFY

Definition at line 73 of file worker.c.

Function Documentation

◆ _fr_worker_rb_free()

static int _fr_worker_rb_free ( void *  arg)
static

Definition at line 164 of file worker.c.

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◆ _worker_request_detach()

static void _worker_request_detach ( request_t request,
void *  uctx 
)
static

Make us responsible for running the request.

Definition at line 1205 of file worker.c.

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◆ _worker_request_done_detached()

static void _worker_request_done_detached ( request_t request,
UNUSED rlm_rcode_t  rcode,
void *  uctx 
)
static

Detached request (i.e.

one generated by the interpreter with no parent) is now complete

As the request has no parent, then there's nothing to free it so we have to.

Definition at line 1170 of file worker.c.

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◆ _worker_request_done_external()

static void _worker_request_done_external ( request_t request,
UNUSED rlm_rcode_t  rcode,
void *  uctx 
)
static

External request is now complete.

Definition at line 1084 of file worker.c.

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◆ _worker_request_done_internal()

static void _worker_request_done_internal ( request_t request,
UNUSED rlm_rcode_t  rcode,
void *  uctx 
)
static

Internal request (i.e.

one generated by the interpreter) is now complete

Whatever generated the request is now responsible for freeing it.

Definition at line 1154 of file worker.c.

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◆ _worker_request_internal_init()

static void _worker_request_internal_init ( request_t request,
void *  uctx 
)
static

Internal request (i.e.

one generated by the interpreter) is now complete

Definition at line 1065 of file worker.c.

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◆ _worker_request_resume()

static void _worker_request_resume ( request_t request,
UNUSED void *  uctx 
)
static

Interpreter is starting to work on request again.

Definition at line 1283 of file worker.c.

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◆ _worker_request_runnable()

static void _worker_request_runnable ( request_t request,
void *  uctx 
)
static

Request is now runnable.

Definition at line 1263 of file worker.c.

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◆ _worker_request_scheduled()

static bool _worker_request_scheduled ( request_t const *  request,
UNUSED void *  uctx 
)
static

Check if a request is scheduled.

Definition at line 1292 of file worker.c.

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◆ _worker_request_stop()

static void _worker_request_stop ( request_t request,
void *  uctx 
)
static

This is called by the interpreter when it wants to stop a request.

The idea is to get the request into the same state it would be in if the interpreter had just finished with it.

Definition at line 1236 of file worker.c.

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◆ _worker_request_yield()

static void _worker_request_yield ( request_t request,
UNUSED void *  uctx 
)
static

Interpreter yielded request.

Definition at line 1274 of file worker.c.

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◆ cmd_stats_worker()

static int cmd_stats_worker ( FILE *  fp,
UNUSED FILE *  fp_err,
void *  ctx,
fr_cmd_info_t const *  info 
)
static

Definition at line 1698 of file worker.c.

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◆ fr_worker()

void fr_worker ( fr_worker_t worker)

The main loop and entry point of the stand-alone worker thread.

Where there is only one thread, the event loop runs fr_worker_pre_event() and fr_worker_post_event() instead, And then fr_worker_post_event() takes care of calling worker_run_request() to actually run the request.

Parameters
[in]workerthe worker data structure to manage

Definition at line 1493 of file worker.c.

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◆ fr_worker_channel_create()

fr_channel_t* fr_worker_channel_create ( fr_worker_t worker,
TALLOC_CTX *  ctx,
fr_control_t master 
)

Create a channel to the worker.

Called by the master (i.e. network) thread when it needs to create a new channel to a particuler worker.

Parameters
[in]workerthe worker
[in]masterthe control plane of the master
[in]ctxthe context in which the channel will be created

Definition at line 1605 of file worker.c.

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◆ fr_worker_create()

fr_worker_t* fr_worker_create ( TALLOC_CTX *  ctx,
fr_event_list_t el,
char const *  name,
fr_log_t const *  logger,
fr_log_lvl_t  lvl,
fr_worker_config_t config 
)

Create a worker.

Parameters
[in]ctxthe talloc context
[in]namethe name of this worker
[in]elthe event list
[in]loggerthe destination for all logging messages
[in]lvllog level
[in]configvarious configuration parameters
Returns
  • NULL on error
  • fr_worker_t on success

Definition at line 1356 of file worker.c.

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◆ fr_worker_debug()

void fr_worker_debug ( fr_worker_t worker,
FILE *  fp 
)

Print debug information about the worker structure.

Parameters
[in]workerthe worker
[in]fpthe file where the debug output is printed.

Definition at line 1580 of file worker.c.

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◆ fr_worker_destroy()

void fr_worker_destroy ( fr_worker_t worker)

Destroy a worker.

The input channels are signaled, and local messages are cleaned up.

This should be called to EXPLICITLY destroy a worker, when some fatal error has occurred on the worker side, and we need to destroy it.

We signal all pending requests in the backlog to stop, and tell the network side that it should not send us any more requests.

Parameters
[in]workerthe worker to destroy.

Definition at line 1012 of file worker.c.

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◆ fr_worker_listen_cancel()

int fr_worker_listen_cancel ( fr_worker_t worker,
fr_listen_t const *  li 
)

Definition at line 1632 of file worker.c.

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◆ fr_worker_listen_cancel_self()

static int fr_worker_listen_cancel_self ( fr_worker_t worker,
fr_listen_t const *  li 
)
static

Definition at line 365 of file worker.c.

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◆ fr_worker_post_event()

void fr_worker_post_event ( UNUSED fr_event_list_t el,
UNUSED fr_time_t  now,
void *  uctx 
)

Post-event handler.

This should be run ONLY in single-threaded mode!

Definition at line 1568 of file worker.c.

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◆ fr_worker_pre_event()

int fr_worker_pre_event ( UNUSED fr_time_t  now,
UNUSED fr_time_delta_t  wake,
void *  uctx 
)

Pre-event handler.

This should be run ONLY in single-threaded mode!

Definition at line 1547 of file worker.c.

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◆ fr_worker_rb_init()

static fr_ring_buffer_t* fr_worker_rb_init ( void  )
inlinestatic

Initialise thread local storage.

Returns
fr_ring_buffer_t for messages

Definition at line 173 of file worker.c.

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◆ fr_worker_stats()

int fr_worker_stats ( fr_worker_t const *  worker,
int  num,
uint64_t *  stats 
)

Definition at line 1681 of file worker.c.

◆ is_worker_thread()

static bool is_worker_thread ( fr_worker_t const *  worker)
inlinestatic

Definition at line 191 of file worker.c.

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◆ itoa_internal()

static char* itoa_internal ( TALLOC_CTX *  ctx,
uint64_t  number 
)
static

Definition at line 754 of file worker.c.

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◆ worker_channel_callback()

static void worker_channel_callback ( void *  ctx,
void const *  data,
size_t  data_size,
fr_time_t  now 
)
static

Handle a control plane message sent to the worker via a channel.

Parameters
[in]ctxthe worker
[in]datathe message
[in]data_sizesize of the data
[in]nowthe current time

Definition at line 248 of file worker.c.

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◆ worker_dedup_cmp()

static int8_t worker_dedup_cmp ( void const *  one,
void const *  two 
)
static

Track a request_t in the "dedup" tree.

Definition at line 989 of file worker.c.

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◆ worker_exit()

static void worker_exit ( fr_worker_t worker)
static

Definition at line 226 of file worker.c.

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◆ worker_listen_cancel_callback()

static void worker_listen_cancel_callback ( void *  ctx,
void const *  data,
NDEBUG_UNUSED size_t  data_size,
UNUSED fr_time_t  now 
)
static

A socket is going away, so clean up any requests which use this socket.

Parameters
[in]ctxthe worker
[in]datathe message
[in]data_sizesize of the data
[in]nowthe current time

Definition at line 392 of file worker.c.

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◆ worker_listener_cmp()

static int8_t worker_listener_cmp ( void const *  one,
void const *  two 
)
static

Definition at line 152 of file worker.c.

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◆ worker_max_request_time()

static void worker_max_request_time ( UNUSED fr_event_list_t el,
UNUSED fr_time_t  when,
void *  uctx 
)
static

Enforce max_request_time.

Run periodically, and tries to clean up requests which were received by the network thread more than max_request_time seconds ago. In the interest of not adding a timer for every packet, the requests are given a 1 second leeway.

Parameters
[in]elthe worker's event list
[in]whenthe current time
[in]uctxthe fr_worker_t.

Definition at line 527 of file worker.c.

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◆ worker_max_request_timer()

static void worker_max_request_timer ( fr_worker_t worker)
static

See when we next need to service the time_order heap for "too old" packets.

Inserts a timer into the event list will will trigger when the packet that was received longest ago, would be older than max_request_time.

Definition at line 564 of file worker.c.

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◆ worker_nak()

static void worker_nak ( fr_worker_t worker,
fr_channel_data_t cd,
fr_time_t  now 
)
static

Send a NAK to the network thread.

The network thread believes that a worker is running a request until that request has been NAK'd. We typically NAK requests when they've been hanging around in the worker's backlog too long, or there was an error executing the request.

Parameters
[in]workerthe worker
[in]cdthe message to NAK
[in]nowwhen the message is NAKd

Definition at line 414 of file worker.c.

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◆ worker_recv_request()

static void worker_recv_request ( void *  ctx,
fr_channel_t ch,
fr_channel_data_t cd 
)
static

Callback which handles a message being received on the worker side.

Parameters
[in]ctxthe worker
[in]chthe channel to drain
[in]cdthe message (if any) to start with

Definition at line 207 of file worker.c.

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◆ worker_request_bootstrap()

static void worker_request_bootstrap ( fr_worker_t worker,
fr_channel_data_t cd,
fr_time_t  now 
)
static

Definition at line 801 of file worker.c.

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◆ worker_request_init()

static void worker_request_init ( fr_worker_t worker,
request_t request,
fr_time_t  now 
)
inlinestatic

Initialize various request fields needed by the worker.

Definition at line 777 of file worker.c.

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◆ worker_request_name_number()

static void worker_request_name_number ( request_t request)
inlinestatic

Definition at line 794 of file worker.c.

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◆ worker_request_time_tracking_end()

static void worker_request_time_tracking_end ( fr_worker_t worker,
request_t request,
fr_time_t  now 
)
static

Definition at line 612 of file worker.c.

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◆ worker_request_time_tracking_start()

static void worker_request_time_tracking_start ( fr_worker_t worker,
request_t request,
fr_time_t  now 
)
static

Start time tracking for a request, and mark it as runnable.

Definition at line 587 of file worker.c.

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◆ worker_requests_cancel()

static void worker_requests_cancel ( fr_worker_channel_t ch)
static

Definition at line 217 of file worker.c.

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◆ worker_run_request()

static void worker_run_request ( fr_worker_t worker,
fr_time_t  start 
)
inlinestatic

Run a request.

Until it either yields, or is done.

This function is also responsible for sending replies, and cleaning up the request.

Parameters
[in]workerthe worker
[in]startthe current time

Definition at line 1307 of file worker.c.

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◆ worker_runnable_cmp()

static int8_t worker_runnable_cmp ( void const *  one,
void const *  two 
)
static

Track a request_t in the "runnable" heap.

Higher priorities take precedence, followed by lower sequence numbers

Definition at line 962 of file worker.c.

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◆ worker_send_reply()

static void worker_send_reply ( fr_worker_t worker,
request_t request,
bool  send_reply,
fr_time_t  now 
)
static

Send a response packet to the network side.

Parameters
[in]workerThis worker.
[in]requestwe're sending a reply for.
[in]send_replywhether the network side sends a reply
[in]nowThe current time

Definition at line 629 of file worker.c.

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◆ worker_stop_request()

static void worker_stop_request ( request_t **  request_p)
static

Signal the unlang interpreter that it needs to stop running the request.

Signalling is a synchronous operation. Whatever I/O requests the request is currently performing are immediately cancelled, and all the frames are popped off the unlang stack.

Modules and unlang keywords explicitly register signal handlers to deal with their yield points being cancelled/interrupted via this function.

The caller should assume the request is no longer viable after calling this function.

Parameters
[in]request_pPointer to the request to cancel. Will be set to NULL.

Definition at line 507 of file worker.c.

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◆ worker_time_order_cmp()

static int8_t worker_time_order_cmp ( void const *  one,
void const *  two 
)
static

Track a request_t in the "time_order" heap.

Definition at line 979 of file worker.c.

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Variable Documentation

◆ cmd_worker_table

fr_cmd_table_t cmd_worker_table[]
Initial value:
= {
{
.parent = "stats",
.name = "worker",
.help = "Statistics for workers threads.",
.read_only = true
},
{
.parent = "stats worker",
.add_name = true,
.name = "self",
.syntax = "[(count|cpu)]",
.help = "Show statistics for a specific worker thread.",
.read_only = true
},
}
#define CMD_TABLE_END
Definition: command.h:62
static int cmd_stats_worker(FILE *fp, UNUSED FILE *fp_err, void *ctx, fr_cmd_info_t const *info)
Definition: worker.c:1698

Definition at line 1734 of file worker.c.

◆ fr_worker_rb

_Thread_local fr_ring_buffer_t* fr_worker_rb
static

Definition at line 79 of file worker.c.

◆ request_number

atomic_uint64_t request_number = 0
static

Definition at line 77 of file worker.c.