scheduler.c File Reference

schedule computations using continuation passing style More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include "disk.h"
#include <inttypes.h>

Include dependency graph for scheduler.c:

Go to the source code of this file.

Data Structures
struct	GNUNET_SCHEDULER_Handle
	Argument to be passed from the driver to GNUNET_SCHEDULER_do_work(). More...
struct	GNUNET_SCHEDULER_Task
	Entry in list of pending tasks. More...
struct	Scheduled
	A struct representing an event the select driver is waiting for. More...
struct	DriverContext
	Driver context used by GNUNET_SCHEDULER_run. More...

Macros
#define	LOG(kind, ...)   GNUNET_log_from (kind, "util-scheduler", __VA_ARGS__)
#define	LOG_STRERROR(kind, syscall)
#define	PROFILE_DELAYS   GNUNET_NO
	Should we figure out which tasks are delayed for a while before they are run? (Consider using in combination with EXECINFO). More...
#define	DELAY_THRESHOLD   GNUNET_TIME_UNIT_SECONDS
	Task that were in the queue for longer than this are reported if PROFILE_DELAYS is active. More...

Functions
void	GNUNET_SCHEDULER_set_select (GNUNET_SCHEDULER_select new_select, void *new_select_cls)
	Sets the select function to use in the scheduler (scheduler_select). More...
static enum GNUNET_SCHEDULER_Priority	check_priority (enum GNUNET_SCHEDULER_Priority p)
	Check that the given priority is legal (and return it). More...
struct GNUNET_TIME_Absolute	get_timeout ()
	chooses the nearest timeout from all pending tasks, to be used to tell the driver the next wakeup time (using its set_wakeup callback) More...
static void	queue_ready_task (struct GNUNET_SCHEDULER_Task *task)
	Put a task that is ready for execution into the ready queue. More...
void	GNUNET_SCHEDULER_shutdown ()
	Request the shutdown of a scheduler. More...
static void	dump_backtrace (struct GNUNET_SCHEDULER_Task *t)
	Output stack trace of task t. More...
static void	destroy_task (struct GNUNET_SCHEDULER_Task *t)
	Destroy a task (release associated resources) More...
static void	sighandler_pipe ()
	Signal handler called for SIGPIPE. More...
static void	sighandler_shutdown ()
	Wait for a short time. More...
static void	shutdown_if_no_lifeness ()
static int	select_loop (struct GNUNET_SCHEDULER_Handle *sh, struct DriverContext *context)
void	GNUNET_SCHEDULER_run (GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Initialize and run scheduler. More...
const struct GNUNET_SCHEDULER_TaskContext *	GNUNET_SCHEDULER_get_task_context ()
	Obtain the task context, giving the reason why the current task was started. More...
unsigned int	GNUNET_SCHEDULER_get_load (enum GNUNET_SCHEDULER_Priority p)
	Get information about the current load of this scheduler. More...
void	init_fd_info (struct GNUNET_SCHEDULER_Task *t, const struct GNUNET_NETWORK_Handle *const *read_nh, unsigned int read_nh_len, const struct GNUNET_NETWORK_Handle *const *write_nh, unsigned int write_nh_len, const struct GNUNET_DISK_FileHandle *const *read_fh, unsigned int read_fh_len, const struct GNUNET_DISK_FileHandle *const *write_fh, unsigned int write_fh_len)
static void	driver_add_multiple (struct GNUNET_SCHEDULER_Task *t)
	calls the given function func on each FdInfo related to t. More...
static void	install_parent_control_handler (void *cls)
static void	shutdown_pipe_cb (void *cls)
void *	GNUNET_SCHEDULER_cancel (struct GNUNET_SCHEDULER_Task *task)
	Cancel the task with the specified identifier. More...
static void	init_backtrace (struct GNUNET_SCHEDULER_Task *t)
	Initialize backtrace data for task t. More...
void	GNUNET_SCHEDULER_add_with_reason_and_priority (GNUNET_SCHEDULER_TaskCallback task, void *task_cls, enum GNUNET_SCHEDULER_Reason reason, enum GNUNET_SCHEDULER_Priority priority)
	Continue the current execution with the given function. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_at_with_priority (struct GNUNET_TIME_Absolute at, enum GNUNET_SCHEDULER_Priority priority, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run at the specified time. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_delayed_with_priority (struct GNUNET_TIME_Relative delay, enum GNUNET_SCHEDULER_Priority priority, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run with a specified delay. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_with_priority (enum GNUNET_SCHEDULER_Priority prio, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run with a specified priority. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_at (struct GNUNET_TIME_Absolute at, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run at the specified time. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_delayed (struct GNUNET_TIME_Relative delay, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run with a specified delay. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_now (GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run as soon as possible. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_shutdown (GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run on shutdown, that is when a CTRL-C signal is received, or when GNUNET_SCHEDULER_shutdown() is being invoked. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_now_with_lifeness (int lifeness, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run as soon as possible with the (transitive) ignore-shutdown flag either explicitly set or explicitly enabled. More...
static struct GNUNET_SCHEDULER_Task *	add_without_sets (struct GNUNET_TIME_Relative delay, enum GNUNET_SCHEDULER_Priority priority, const struct GNUNET_NETWORK_Handle *read_nh, const struct GNUNET_NETWORK_Handle *write_nh, const struct GNUNET_DISK_FileHandle *read_fh, const struct GNUNET_DISK_FileHandle *write_fh, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run with a specified delay or when any of the specified file descriptor sets is ready. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_read_net (struct GNUNET_TIME_Relative delay, struct GNUNET_NETWORK_Handle *rfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run with a specified delay or when the specified file descriptor is ready for reading. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_read_net_with_priority (struct GNUNET_TIME_Relative delay, enum GNUNET_SCHEDULER_Priority priority, struct GNUNET_NETWORK_Handle *rfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run with a specified priority and to be run after the specified delay or when the specified file descriptor is ready for reading. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_write_net (struct GNUNET_TIME_Relative delay, struct GNUNET_NETWORK_Handle *wfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run with a specified delay or when the specified file descriptor is ready for writing. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_net_with_priority (struct GNUNET_TIME_Relative delay, enum GNUNET_SCHEDULER_Priority priority, struct GNUNET_NETWORK_Handle *fd, int on_read, int on_write, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run with a specified delay or when the specified file descriptor is ready. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_read_file (struct GNUNET_TIME_Relative delay, const struct GNUNET_DISK_FileHandle *rfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run with a specified delay or when the specified file descriptor is ready for reading. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_write_file (struct GNUNET_TIME_Relative delay, const struct GNUNET_DISK_FileHandle *wfd, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run with a specified delay or when the specified file descriptor is ready for writing. More...
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_file_with_priority (struct GNUNET_TIME_Relative delay, enum GNUNET_SCHEDULER_Priority priority, const struct GNUNET_DISK_FileHandle *fd, int on_read, int on_write, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run with a specified delay or when the specified file descriptor is ready. More...
void	extract_handles (const struct GNUNET_NETWORK_FDSet *fdset, const struct GNUNET_NETWORK_Handle ***ntarget, unsigned int *extracted_nhandles, const struct GNUNET_DISK_FileHandle ***ftarget, unsigned int *extracted_fhandles)
struct GNUNET_SCHEDULER_Task *	GNUNET_SCHEDULER_add_select (enum GNUNET_SCHEDULER_Priority prio, struct GNUNET_TIME_Relative delay, const struct GNUNET_NETWORK_FDSet *rs, const struct GNUNET_NETWORK_FDSet *ws, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
	Schedule a new task to be run with a specified delay or when any of the specified file descriptor sets is ready. More...
void	GNUNET_SCHEDULER_task_ready (struct GNUNET_SCHEDULER_Task *task, struct GNUNET_SCHEDULER_FdInfo *fdi)
	Function used by event-loop implementations to signal the scheduler that a particular task is ready due to an event specified in the et field of fdi. More...
int	GNUNET_SCHEDULER_do_work (struct GNUNET_SCHEDULER_Handle *sh)
	Function called by external event loop implementations to tell the scheduler to run some of the tasks that are ready. More...
struct GNUNET_SCHEDULER_Handle *	GNUNET_SCHEDULER_driver_init (const struct GNUNET_SCHEDULER_Driver *driver)
	Function called by external event loop implementations to initialize the scheduler. More...
void	GNUNET_SCHEDULER_driver_done (struct GNUNET_SCHEDULER_Handle *sh)
	Counter-part of GNUNET_SCHEDULER_driver_init. More...
static int	select_add (void *cls, struct GNUNET_SCHEDULER_Task *task, struct GNUNET_SCHEDULER_FdInfo *fdi)
static int	select_del (void *cls, struct GNUNET_SCHEDULER_Task *task)
static void	select_set_wakeup (void *cls, struct GNUNET_TIME_Absolute dt)
struct GNUNET_SCHEDULER_Driver *	GNUNET_SCHEDULER_driver_select ()
	Obtain the driver for using select() as the event loop. More...
void	GNUNET_SCHEDULER_begin_async_scope (struct GNUNET_AsyncScopeId *aid)
	Change the async scope for the currently executing task and (transitively) for all tasks scheduled by the current task after calling this function. More...

Variables
static const struct GNUNET_SCHEDULER_Driver *	scheduler_driver
	The driver used for the event loop. More...
static struct GNUNET_SCHEDULER_Task *	pending_head
	Head of list of tasks waiting for an event. More...
static struct GNUNET_SCHEDULER_Task *	pending_tail
	Tail of list of tasks waiting for an event. More...
static struct GNUNET_SCHEDULER_Task *	shutdown_head
	Head of list of tasks waiting for shutdown. More...
static struct GNUNET_SCHEDULER_Task *	shutdown_tail
	Tail of list of tasks waiting for shutdown. More...
static struct GNUNET_SCHEDULER_Task *	pending_timeout_head
	List of tasks waiting ONLY for a timeout event. More...
static struct GNUNET_SCHEDULER_Task *	pending_timeout_tail
	List of tasks waiting ONLY for a timeout event. More...
static struct GNUNET_SCHEDULER_Task *	pending_timeout_last
	Last inserted task waiting ONLY for a timeout event. More...
static struct GNUNET_SCHEDULER_Task *	active_task
	ID of the task that is running right now. More...
static struct GNUNET_SCHEDULER_Task *	ready_head [GNUNET_SCHEDULER_PRIORITY_COUNT]
	Head of list of tasks ready to run right now, grouped by importance. More...
static struct GNUNET_SCHEDULER_Task *	ready_tail [GNUNET_SCHEDULER_PRIORITY_COUNT]
	Tail of list of tasks ready to run right now, grouped by importance. More...
static struct GNUNET_SCHEDULER_Task *	install_parent_control_task
	Task for installing parent control handlers (it might happen that the scheduler is shutdown before this task is executed, so GNUNET_SCHEDULER_shutdown must cancel it in that case) More...
static struct GNUNET_SCHEDULER_Task *	shutdown_pipe_task
	Task for reading from a pipe that signal handlers will use to initiate shutdown. More...
static unsigned int	ready_count
	Number of tasks on the ready list. More...
static enum GNUNET_SCHEDULER_Priority	current_priority
	Priority of the task running right now. More...
static enum GNUNET_SCHEDULER_Priority	max_priority_added
	Priority of the highest task added in the current select iteration. More...
static int	current_lifeness
	Value of the 'lifeness' flag for the current task. More...
static enum GNUNET_SCHEDULER_Priority	work_priority
	Priority used currently in GNUNET_SCHEDULER_do_work(). More...
static GNUNET_SCHEDULER_select	scheduler_select
	Function to use as a select() in the scheduler. More...
static struct GNUNET_SCHEDULER_TaskContext	tc
	Task context of the current task. More...
static void *	scheduler_select_cls
	Closure for scheduler_select. More...
static struct GNUNET_DISK_PipeHandle *	shutdown_pipe_handle
	Pipe used to communicate shutdown via signal. More...
static pid_t	my_pid
	Process ID of this process at the time we installed the various signal handlers. More...

Detailed Description

schedule computations using continuation passing style

Author

Christian Grothoff

Definition in file scheduler.c.

Macro Definition Documentation

LOG

#define LOG	(		kind,
			...
	)		GNUNET_log_from (kind, "util-scheduler", __VA_ARGS__)

Definition at line 31 of file scheduler.c.

Referenced by destroy_task(), driver_add_multiple(), dump_backtrace(), GNUNET_SCHEDULER_add_at_with_priority(), GNUNET_SCHEDULER_add_now_with_lifeness(), GNUNET_SCHEDULER_add_select(), GNUNET_SCHEDULER_add_shutdown(), GNUNET_SCHEDULER_add_with_reason_and_priority(), GNUNET_SCHEDULER_cancel(), GNUNET_SCHEDULER_do_work(), GNUNET_SCHEDULER_driver_init(), GNUNET_SCHEDULER_shutdown(), and select_loop().

LOG_STRERROR

#define LOG_STRERROR	(		kind,
			syscall
	)

Value:

GNUNET_log_from_strerror (kind, \
                                                              "util-scheduler", \
                                                              syscall)

Definition at line 33 of file scheduler.c.

Referenced by select_loop().

PROFILE_DELAYS

#define PROFILE_DELAYS   GNUNET_NO

Should we figure out which tasks are delayed for a while before they are run? (Consider using in combination with EXECINFO).

Definition at line 67 of file scheduler.c.

DELAY_THRESHOLD

#define DELAY_THRESHOLD   GNUNET_TIME_UNIT_SECONDS

Task that were in the queue for longer than this are reported if PROFILE_DELAYS is active.

Definition at line 73 of file scheduler.c.

Referenced by GNUNET_SCHEDULER_do_work().

Function Documentation

check_priority()

static enum GNUNET_SCHEDULER_Priority check_priority ( enum GNUNET_SCHEDULER_Priority  p )

static

Check that the given priority is legal (and return it).

Parameters

p	priority value to check

Returns

p on success, 0 on error

Definition at line 454 of file scheduler.c.

References GNUNET_assert, GNUNET_SCHEDULER_PRIORITY_COUNT, and p.

Referenced by add_without_sets(), GNUNET_SCHEDULER_add_at_with_priority(), GNUNET_SCHEDULER_add_select(), GNUNET_SCHEDULER_add_with_reason_and_priority(), GNUNET_SCHEDULER_cancel(), GNUNET_SCHEDULER_get_load(), and queue_ready_task().

{
  if ((p >= 0) && (p < GNUNET_SCHEDULER_PRIORITY_COUNT))
    return p;
  GNUNET_assert (0);
  return 0;                     /* make compiler happy */
}

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get_timeout()

struct GNUNET_TIME_Absolute get_timeout

(

)

chooses the nearest timeout from all pending tasks, to be used to tell the driver the next wakeup time (using its set_wakeup callback)

Definition at line 469 of file scheduler.c.

References GNUNET_TIME_Absolute::abs_value_us, GNUNET_TIME_absolute_get(), GNUNET_TIME_UNIT_FOREVER_ABS, GNUNET_SCHEDULER_Task::next, pending_timeout_head, and timeout.

Referenced by GNUNET_SCHEDULER_do_work(), and GNUNET_SCHEDULER_driver_init().

{
  struct GNUNET_SCHEDULER_Task *pos;
  struct GNUNET_TIME_Absolute now;
  struct GNUNET_TIME_Absolute timeout;

  pos = pending_timeout_head;
  now = GNUNET_TIME_absolute_get ();
  timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
  if (NULL != pos)
  {
    if (0 != pos->reason)
    {
      return now;
    }
    else
    {
      timeout = pos->timeout;
    }
  }
  for (pos = pending_head; NULL != pos; pos = pos->next)
  {
    if (0 != pos->reason)
    {
      return now;
    }
    else if ((pos->timeout.abs_value_us !=
              GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us) &&
             (timeout.abs_value_us > pos->timeout.abs_value_us))
    {
      timeout = pos->timeout;
    }
  }
  return timeout;
}

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queue_ready_task()

static void queue_ready_task ( struct GNUNET_SCHEDULER_Task *  task )

static

Put a task that is ready for execution into the ready queue.

Parameters

task	task ready for execution

Definition at line 512 of file scheduler.c.

References check_priority(), GNUNET_CONTAINER_DLL_insert_tail, GNUNET_YES, GNUNET_SCHEDULER_Task::in_ready_list, p, GNUNET_SCHEDULER_Task::priority, and ready_count.

Referenced by GNUNET_SCHEDULER_add_at_with_priority(), GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_add_with_reason_and_priority(), GNUNET_SCHEDULER_do_work(), GNUNET_SCHEDULER_shutdown(), and GNUNET_SCHEDULER_task_ready().

{
  enum GNUNET_SCHEDULER_Priority p = check_priority (task->priority);

  GNUNET_CONTAINER_DLL_insert_tail (ready_head[p],
                                    ready_tail[p],
                                    task);
  task->in_ready_list = GNUNET_YES;
  ready_count++;
}

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dump_backtrace()

static void dump_backtrace ( struct GNUNET_SCHEDULER_Task *  t )

static

Output stack trace of task t.

Parameters

t	task to dump stack trace of

Definition at line 564 of file scheduler.c.

References GNUNET_ERROR_TYPE_WARNING, and LOG.

Referenced by GNUNET_SCHEDULER_do_work(), init_backtrace(), and select_loop().

{
#if EXECINFO
  for (unsigned int i = 0; i < t->num_backtrace_strings; i++)
    LOG (GNUNET_ERROR_TYPE_WARNING,
         "Task %p trace %u: %s\n",
         t,
         i,
         t->backtrace_strings[i]);
#else
  (void) t;
#endif
}

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destroy_task()

static void destroy_task ( struct GNUNET_SCHEDULER_Task *  t )

static

Destroy a task (release associated resources)

Parameters

t	task to destroy

Definition at line 585 of file scheduler.c.

References GNUNET_NETWORK_Handle::fd, GNUNET_SCHEDULER_FdInfo::fd, GNUNET_SCHEDULER_Task::fds, GNUNET_SCHEDULER_Task::fds_len, fh, GNUNET_SCHEDULER_FdInfo::fh, GNUNET_array_grow, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_free_nz, GNUNET_NETWORK_socket_free_memory_only_(), GNUNET_YES, LOG, and GNUNET_SCHEDULER_Task::own_handles.

Referenced by GNUNET_SCHEDULER_cancel(), and GNUNET_SCHEDULER_do_work().

{
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "destroying task %p\n",
       t);

  if (GNUNET_YES == t->own_handles)
  {
    for (unsigned int i = 0; i != t->fds_len; ++i)
    {
      const struct GNUNET_NETWORK_Handle *fd = t->fds[i].fd;
      const struct GNUNET_DISK_FileHandle *fh = t->fds[i].fh;
      if (fd)
      {
        GNUNET_NETWORK_socket_free_memory_only_ (
          (struct GNUNET_NETWORK_Handle *) fd);
      }
      if (fh)
      {
        // FIXME: on WIN32 this is not enough! A function
        // GNUNET_DISK_file_free_memory_only would be nice
        GNUNET_free_nz ((void *) fh);
      }
    }
  }
  if (t->fds_len > 1)
  {
    GNUNET_array_grow (t->fds, t->fds_len, 0);
  }
#if EXECINFO
  GNUNET_free (t->backtrace_strings);
#endif
  GNUNET_free (t);
}

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sighandler_pipe()

static void sighandler_pipe ( )

static

Signal handler called for SIGPIPE.

Definition at line 636 of file scheduler.c.

Referenced by GNUNET_SCHEDULER_driver_init().

{
  return;
}

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sighandler_shutdown()

static void sighandler_shutdown ( )

static

Wait for a short time.

Sleeps for ms ms (as that should be long enough for virtually all modern systems to context switch and allow another process to do some 'real' work).

Parameters

ms	how many ms to wait Signal handler called for signals that should cause us to shutdown.

Definition at line 664 of file scheduler.c.

References GNUNET_DISK_file_write(), GNUNET_DISK_PIPE_END_WRITE, GNUNET_DISK_pipe_handle(), and my_pid.

Referenced by GNUNET_SCHEDULER_driver_init().

{
  static char c;
  int old_errno = errno;        /* backup errno */

  if (getpid () != my_pid)
    _exit (1);                   /* we have fork'ed since the signal handler was created,
                                  * ignore the signal, see https://gnunet.org/vfork discussion */
  GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle
                            (shutdown_pipe_handle, GNUNET_DISK_PIPE_END_WRITE),
                          &c, sizeof(c));
  errno = old_errno;
}

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shutdown_if_no_lifeness()

static void shutdown_if_no_lifeness ( )

static

Definition at line 680 of file scheduler.c.

References context, GNUNET_SCHEDULER_shutdown(), GNUNET_YES, GNUNET_SCHEDULER_Task::lifeness, GNUNET_SCHEDULER_Task::next, ready_count, select_loop(), sh, and t.

Referenced by GNUNET_SCHEDULER_do_work().

{
  struct GNUNET_SCHEDULER_Task *t;

  if (ready_count > 0)
    return;
  for (t = pending_head; NULL != t; t = t->next)
    if (GNUNET_YES == t->lifeness)
      return;
  for (t = shutdown_head; NULL != t; t = t->next)
    if (GNUNET_YES == t->lifeness)
      return;
  for (t = pending_timeout_head; NULL != t; t = t->next)
    if (GNUNET_YES == t->lifeness)
      return;
  /* No lifeness! */
  GNUNET_SCHEDULER_shutdown ();
}

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select_loop()

static int select_loop ( struct GNUNET_SCHEDULER_Handle *  sh, struct DriverContext *  context  )

static

Definition at line 2311 of file scheduler.c.

References GNUNET_TIME_Absolute::abs_value_us, dump_backtrace(), GNUNET_assert, GNUNET_ERROR_TYPE_DEBUG, GNUNET_ERROR_TYPE_ERROR, GNUNET_ERROR_TYPE_WARNING, GNUNET_NETWORK_fdset_create(), GNUNET_NETWORK_fdset_destroy(), GNUNET_NETWORK_fdset_set_native(), GNUNET_NETWORK_fdset_test_native(), GNUNET_NETWORK_fdset_zero(), GNUNET_NETWORK_socket_select(), GNUNET_NO, GNUNET_OK, GNUNET_SCHEDULER_do_work(), GNUNET_SCHEDULER_ET_IN, GNUNET_SCHEDULER_ET_OUT, GNUNET_SCHEDULER_task_ready(), GNUNET_STRINGS_absolute_time_to_string(), GNUNET_SYSERR, GNUNET_TIME_absolute_get_remaining(), GNUNET_TIME_UNIT_FOREVER_ABS, GNUNET_TIME_UNIT_ZERO, GNUNET_YES, LOG, LOG_STRERROR, Scheduled::next, ready_count, GNUNET_SCHEDULER_Handle::rs, DriverContext::scheduled_head, scheduler_select, scheduler_select_cls, DriverContext::timeout, and GNUNET_SCHEDULER_Handle::ws.

Referenced by GNUNET_SCHEDULER_run(), and shutdown_if_no_lifeness().

{
  struct GNUNET_NETWORK_FDSet *rs;
  struct GNUNET_NETWORK_FDSet *ws;
  int select_result;

  GNUNET_assert (NULL != context);
  rs = GNUNET_NETWORK_fdset_create ();
  ws = GNUNET_NETWORK_fdset_create ();
  while ((NULL != context->scheduled_head) ||
         (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us !=
          context->timeout.abs_value_us))
  {
    struct GNUNET_TIME_Relative time_remaining;

    LOG (GNUNET_ERROR_TYPE_DEBUG,
         "select timeout = %s\n",
         GNUNET_STRINGS_absolute_time_to_string (context->timeout));

    GNUNET_NETWORK_fdset_zero (rs);
    GNUNET_NETWORK_fdset_zero (ws);

    for (struct Scheduled *pos = context->scheduled_head;
         NULL != pos;
         pos = pos->next)
    {
      if (0 != (GNUNET_SCHEDULER_ET_IN & pos->et))
      {
        GNUNET_NETWORK_fdset_set_native (rs, pos->fdi->sock);
      }
      if (0 != (GNUNET_SCHEDULER_ET_OUT & pos->et))
      {
        GNUNET_NETWORK_fdset_set_native (ws, pos->fdi->sock);
      }
    }
    time_remaining = GNUNET_TIME_absolute_get_remaining (context->timeout);
    if (0 < ready_count)
      time_remaining = GNUNET_TIME_UNIT_ZERO;
    if (NULL == scheduler_select)
    {
      select_result = GNUNET_NETWORK_socket_select (rs,
                                                    ws,
                                                    NULL,
                                                    time_remaining);
    }
    else
    {
      select_result = scheduler_select (scheduler_select_cls,
                                        rs,
                                        ws,
                                        NULL,
                                        time_remaining);
    }
    if (select_result == GNUNET_SYSERR)
    {
      if (errno == EINTR)
        continue;

      LOG_STRERROR (GNUNET_ERROR_TYPE_ERROR,
                    "select");
#if USE_LSOF
      char lsof[512];

      snprintf (lsof,
                sizeof(lsof),
                "lsof -p %d",
                getpid ());
      (void) close (1);
      (void) dup2 (2, 1);
      if (0 != system (lsof))
        LOG_STRERROR (GNUNET_ERROR_TYPE_WARNING,
                      "system");
#endif
#if DEBUG_FDS
      for (struct Scheduled *s = context->scheduled_head;
           NULL != s;
           s = s->next)
      {
        int flags = fcntl (s->fdi->sock,
                           F_GETFD);

        if ((flags == -1) &&
            (EBADF == errno))
        {
          LOG (GNUNET_ERROR_TYPE_ERROR,
               "Got invalid file descriptor %d!\n",
               s->fdi->sock);
#if EXECINFO
          dump_backtrace (s->task);
#endif
        }
      }
#endif
      GNUNET_assert (0);
      GNUNET_NETWORK_fdset_destroy (rs);
      GNUNET_NETWORK_fdset_destroy (ws);
      return GNUNET_SYSERR;
    }
    if (select_result > 0)
    {
      for (struct Scheduled *pos = context->scheduled_head;
           NULL != pos;
           pos = pos->next)
      {
        int is_ready = GNUNET_NO;

        if ((0 != (GNUNET_SCHEDULER_ET_IN & pos->et)) &&
            (GNUNET_YES ==
             GNUNET_NETWORK_fdset_test_native (rs,
                                               pos->fdi->sock)) )
        {
          pos->fdi->et |= GNUNET_SCHEDULER_ET_IN;
          is_ready = GNUNET_YES;
        }
        if ((0 != (GNUNET_SCHEDULER_ET_OUT & pos->et)) &&
            (GNUNET_YES ==
             GNUNET_NETWORK_fdset_test_native (ws,
                                               pos->fdi->sock)) )
        {
          pos->fdi->et |= GNUNET_SCHEDULER_ET_OUT;
          is_ready = GNUNET_YES;
        }
        if (GNUNET_YES == is_ready)
        {
          GNUNET_SCHEDULER_task_ready (pos->task,
                                       pos->fdi);
        }
      }
    }
    if (GNUNET_YES == GNUNET_SCHEDULER_do_work (sh))
    {
      LOG (GNUNET_ERROR_TYPE_DEBUG,
           "scheduler has more tasks ready!\n");
    }
  }
  GNUNET_NETWORK_fdset_destroy (rs);
  GNUNET_NETWORK_fdset_destroy (ws);
  return GNUNET_OK;
}

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init_fd_info()

void init_fd_info	(	struct GNUNET_SCHEDULER_Task *	t,
		const struct GNUNET_NETWORK_Handle *const *	read_nh,
		unsigned int	read_nh_len,
		const struct GNUNET_NETWORK_Handle *const *	write_nh,
		unsigned int	write_nh_len,
		const struct GNUNET_DISK_FileHandle *const *	read_fh,
		unsigned int	read_fh_len,
		const struct GNUNET_DISK_FileHandle *const *	write_fh,
		unsigned int	write_fh_len
	)

Definition at line 788 of file scheduler.c.

References GNUNET_SCHEDULER_FdInfo::et, GNUNET_SCHEDULER_FdInfo::fd, GNUNET_SCHEDULER_Task::fds, GNUNET_SCHEDULER_Task::fds_len, GNUNET_SCHEDULER_Task::fdx, GNUNET_SCHEDULER_FdInfo::fh, GNUNET_assert, GNUNET_NETWORK_get_fd(), GNUNET_new_array, GNUNET_SCHEDULER_ET_IN, GNUNET_SCHEDULER_ET_OUT, GNUNET_SCHEDULER_Task::read_fd, GNUNET_SCHEDULER_FdInfo::sock, and GNUNET_SCHEDULER_Task::write_fd.

Referenced by add_without_sets(), and GNUNET_SCHEDULER_add_select().

{
  // FIXME: if we have exactly two network handles / exactly two file handles
  // and they are equal, we can make one FdInfo with both
  // GNUNET_SCHEDULER_ET_IN and GNUNET_SCHEDULER_ET_OUT set.
  struct GNUNET_SCHEDULER_FdInfo *fdi;

  t->fds_len = read_nh_len + write_nh_len + read_fh_len + write_fh_len;
  if (1 == t->fds_len)
  {
    fdi = &t->fdx;
    t->fds = fdi;
    if (1 == read_nh_len)
    {
      GNUNET_assert (NULL != read_nh);
      GNUNET_assert (NULL != *read_nh);
      fdi->fd = *read_nh;
      fdi->et = GNUNET_SCHEDULER_ET_IN;
      fdi->sock = GNUNET_NETWORK_get_fd (*read_nh);
      t->read_fd = fdi->sock;
      t->write_fd = -1;
    }
    else if (1 == write_nh_len)
    {
      GNUNET_assert (NULL != write_nh);
      GNUNET_assert (NULL != *write_nh);
      fdi->fd = *write_nh;
      fdi->et = GNUNET_SCHEDULER_ET_OUT;
      fdi->sock = GNUNET_NETWORK_get_fd (*write_nh);
      t->read_fd = -1;
      t->write_fd = fdi->sock;
    }
    else if (1 == read_fh_len)
    {
      GNUNET_assert (NULL != read_fh);
      GNUNET_assert (NULL != *read_fh);
      fdi->fh = *read_fh;
      fdi->et = GNUNET_SCHEDULER_ET_IN;
      fdi->sock = (*read_fh)->fd;     // FIXME: does not work under WIN32
      t->read_fd = fdi->sock;
      t->write_fd = -1;
    }
    else
    {
      GNUNET_assert (NULL != write_fh);
      GNUNET_assert (NULL != *write_fh);
      fdi->fh = *write_fh;
      fdi->et = GNUNET_SCHEDULER_ET_OUT;
      fdi->sock = (*write_fh)->fd;     // FIXME: does not work under WIN32
      t->read_fd = -1;
      t->write_fd = fdi->sock;
    }
  }
  else
  {
    fdi = GNUNET_new_array (t->fds_len, struct GNUNET_SCHEDULER_FdInfo);
    t->fds = fdi;
    t->read_fd = -1;
    t->write_fd = -1;
    unsigned int i;
    for (i = 0; i != read_nh_len; ++i)
    {
      fdi->fd = read_nh[i];
      GNUNET_assert (NULL != fdi->fd);
      fdi->et = GNUNET_SCHEDULER_ET_IN;
      fdi->sock = GNUNET_NETWORK_get_fd (read_nh[i]);
      ++fdi;
    }
    for (i = 0; i != write_nh_len; ++i)
    {
      fdi->fd = write_nh[i];
      GNUNET_assert (NULL != fdi->fd);
      fdi->et = GNUNET_SCHEDULER_ET_OUT;
      fdi->sock = GNUNET_NETWORK_get_fd (write_nh[i]);
      ++fdi;
    }
    for (i = 0; i != read_fh_len; ++i)
    {
      fdi->fh = read_fh[i];
      GNUNET_assert (NULL != fdi->fh);
      fdi->et = GNUNET_SCHEDULER_ET_IN;
      fdi->sock = (read_fh[i])->fd;     // FIXME: does not work under WIN32
      ++fdi;
    }
    for (i = 0; i != write_fh_len; ++i)
    {
      fdi->fh = write_fh[i];
      GNUNET_assert (NULL != fdi->fh);
      fdi->et = GNUNET_SCHEDULER_ET_OUT;
      fdi->sock = (write_fh[i])->fd;     // FIXME: does not work under WIN32
      ++fdi;
    }
  }
}

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driver_add_multiple()

static void driver_add_multiple ( struct GNUNET_SCHEDULER_Task *  t )

static

calls the given function func on each FdInfo related to t.

Optionally updates the event type field in each FdInfo after calling func.

Parameters

t	the task
driver_func	the function to call with each FdInfo contained in in t
if_not_ready	only call driver_func on FdInfos that are not ready
et	the event type to be set in each FdInfo after calling driver_func on it, or -1 if no updating not desired.

Definition at line 906 of file scheduler.c.

References GNUNET_SCHEDULER_Driver::add, GNUNET_SCHEDULER_Driver::cls, GNUNET_SCHEDULER_FdInfo::et, GNUNET_SCHEDULER_Task::fds, GNUNET_SCHEDULER_Task::fds_len, GNUNET_ERROR_TYPE_ERROR, GNUNET_SCHEDULER_ET_NONE, GNUNET_YES, and LOG.

Referenced by add_without_sets(), and GNUNET_SCHEDULER_add_select().

{
  struct GNUNET_SCHEDULER_FdInfo *fdi;
  int success = GNUNET_YES;

  for (unsigned int i = 0; i != t->fds_len; ++i)
  {
    fdi = &t->fds[i];
    success = scheduler_driver->add (scheduler_driver->cls,
                                     t,
                                     fdi) && success;
    fdi->et = GNUNET_SCHEDULER_ET_NONE;
  }
  if (GNUNET_YES != success)
  {
    LOG (GNUNET_ERROR_TYPE_ERROR,
         "driver could not add task\n");
  }
}

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install_parent_control_handler()

static void install_parent_control_handler ( void *  cls )

static

Definition at line 928 of file scheduler.c.

References GNUNET_OS_install_parent_control_handler().

Referenced by GNUNET_SCHEDULER_driver_init().

{
  (void) cls;
  install_parent_control_task = NULL;
  GNUNET_OS_install_parent_control_handler (NULL);
}

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shutdown_pipe_cb()

static void shutdown_pipe_cb ( void *  cls )

static

Definition at line 937 of file scheduler.c.

References GNUNET_assert, GNUNET_DISK_file_read(), GNUNET_DISK_handle_invalid(), GNUNET_DISK_PIPE_END_READ, GNUNET_DISK_pipe_handle(), GNUNET_SCHEDULER_add_read_file(), GNUNET_SCHEDULER_shutdown(), and GNUNET_TIME_UNIT_FOREVER_REL.

Referenced by GNUNET_SCHEDULER_driver_init().

{
  char c;
  const struct GNUNET_DISK_FileHandle *pr;

  (void) cls;
  shutdown_pipe_task = NULL;
  pr = GNUNET_DISK_pipe_handle (shutdown_pipe_handle,
                                GNUNET_DISK_PIPE_END_READ);
  GNUNET_assert (! GNUNET_DISK_handle_invalid (pr));
  /* consume the signal */
  GNUNET_DISK_file_read (pr, &c, sizeof(c));
  /* mark all active tasks as ready due to shutdown */
  GNUNET_SCHEDULER_shutdown ();
  shutdown_pipe_task =
    GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
                                    pr,
                                    &shutdown_pipe_cb,
                                    NULL);
}

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init_backtrace()

static void init_backtrace ( struct GNUNET_SCHEDULER_Task *  t )

static

Initialize backtrace data for task t.

Parameters

t	task to initialize

Definition at line 1038 of file scheduler.c.

References dump_backtrace().

Referenced by add_without_sets(), GNUNET_SCHEDULER_add_at_with_priority(), GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_add_now_with_lifeness(), GNUNET_SCHEDULER_add_select(), GNUNET_SCHEDULER_add_shutdown(), and GNUNET_SCHEDULER_add_with_reason_and_priority().

{
#if EXECINFO
  void *backtrace_array[MAX_TRACE_DEPTH];

  t->num_backtrace_strings
    = backtrace (backtrace_array, MAX_TRACE_DEPTH);
  t->backtrace_strings =
    backtrace_symbols (backtrace_array,
                       t->num_backtrace_strings);
  dump_backtrace (t);
#else
  (void) t;
#endif
}

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add_without_sets()

static struct GNUNET_SCHEDULER_Task* add_without_sets ( struct GNUNET_TIME_Relative  delay, enum GNUNET_SCHEDULER_Priority  priority, const struct GNUNET_NETWORK_Handle *  read_nh, const struct GNUNET_NETWORK_Handle *  write_nh, const struct GNUNET_DISK_FileHandle *  read_fh, const struct GNUNET_DISK_FileHandle *  write_fh, GNUNET_SCHEDULER_TaskCallback  task, void *  task_cls  )

static

Schedule a new task to be run with a specified delay or when any of the specified file descriptor sets is ready.

The delay can be used as a timeout on the socket(s) being ready. The task will be scheduled for execution once either the delay has expired or any of the socket operations is ready. This is the most general function of the "add" family. Note that the "prerequisite_task" must be satisfied in addition to any of the other conditions. In other words, the task will be started when (prerequisite-run) && (delay-ready || any-rs-ready || any-ws-ready)

Parameters

delay	how long should we wait?
priority	priority to use
rfd	file descriptor we want to read (can be -1)
wfd	file descriptors we want to write (can be -1)
task	main function of the task
task_cls	closure of task

Returns

unique task identifier for the job only valid until task is started!

Definition at line 1445 of file scheduler.c.

References GNUNET_SCHEDULER_Task::callback, GNUNET_SCHEDULER_Task::callback_cls, check_priority(), current_lifeness, current_priority, driver_add_multiple(), GNUNET_DISK_FileHandle::fd, GNUNET_assert, GNUNET_async_scope_get(), GNUNET_CONTAINER_DLL_insert, GNUNET_MAX, GNUNET_NETWORK_get_fd(), GNUNET_new, GNUNET_SCHEDULER_PRIORITY_KEEP, GNUNET_TIME_absolute_get(), GNUNET_TIME_relative_to_absolute(), init_backtrace(), init_fd_info(), GNUNET_SCHEDULER_Task::lifeness, max_priority_added, GNUNET_SCHEDULER_Task::priority, GNUNET_SCHEDULER_Task::scope, t, and GNUNET_SCHEDULER_Task::timeout.

Referenced by GNUNET_SCHEDULER_add_file_with_priority(), and GNUNET_SCHEDULER_add_net_with_priority().

{
  struct GNUNET_SCHEDULER_Task *t;

  /* scheduler must be running */
  GNUNET_assert (NULL != scheduler_driver);
  GNUNET_assert (NULL != task);
  t = GNUNET_new (struct GNUNET_SCHEDULER_Task);
  GNUNET_async_scope_get (&t->scope);
  init_fd_info (t,
                &read_nh,
                read_nh ? 1 : 0,
                &write_nh,
                write_nh ? 1 : 0,
                &read_fh,
                read_fh ? 1 : 0,
                &write_fh,
                write_fh ? 1 : 0);
  t->callback = task;
  t->callback_cls = task_cls;
#if DEBUG_FDS
  check_fd (t, NULL != read_nh ? GNUNET_NETWORK_get_fd (read_nh) : -1);
  check_fd (t, NULL != write_nh ? GNUNET_NETWORK_get_fd (write_nh) : -1);
  check_fd (t, NULL != read_fh ? read_fh->fd : -1);
  check_fd (t, NULL != write_fh ? write_fh->fd : -1);
#endif
#if PROFILE_DELAYS
  t->start_time = GNUNET_TIME_absolute_get ();
#endif
  t->timeout = GNUNET_TIME_relative_to_absolute (delay);
  t->priority = check_priority ((priority == GNUNET_SCHEDULER_PRIORITY_KEEP) ?
                                current_priority : priority);
  t->lifeness = current_lifeness;
  GNUNET_CONTAINER_DLL_insert (pending_head,
                               pending_tail,
                               t);
  driver_add_multiple (t);
  max_priority_added = GNUNET_MAX (max_priority_added,
                                   t->priority);
  init_backtrace (t);
  return t;
}

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extract_handles()

void extract_handles	(	const struct GNUNET_NETWORK_FDSet *	fdset,
		const struct GNUNET_NETWORK_Handle ***	ntarget,
		unsigned int *	extracted_nhandles,
		const struct GNUNET_DISK_FileHandle ***	ftarget,
		unsigned int *	extracted_fhandles
	)

Definition at line 1759 of file scheduler.c.

References GNUNET_array_append, GNUNET_assert, GNUNET_DISK_get_handle_from_int_fd(), GNUNET_NETWORK_fdset_test_native(), GNUNET_NETWORK_socket_box_native(), GNUNET_YES, and GNUNET_NETWORK_FDSet::nsds.

Referenced by GNUNET_SCHEDULER_add_select().

{
  // FIXME: this implementation only works for unix, for WIN32 the file handles
  // in fdset must be handled separately
  const struct GNUNET_NETWORK_Handle **nhandles;
  const struct GNUNET_DISK_FileHandle **fhandles;
  unsigned int nhandles_len;
  unsigned int fhandles_len;

  nhandles = NULL;
  fhandles = NULL;
  nhandles_len = 0;
  fhandles_len = 0;
  for (int sock = 0; sock != fdset->nsds; ++sock)
  {
    if (GNUNET_YES == GNUNET_NETWORK_fdset_test_native (fdset, sock))
    {
      struct GNUNET_NETWORK_Handle *nhandle;
      struct GNUNET_DISK_FileHandle *fhandle;

      nhandle = GNUNET_NETWORK_socket_box_native (sock);
      if (NULL != nhandle)
      {
        GNUNET_array_append (nhandles, nhandles_len, nhandle);
      }
      else
      {
        fhandle = GNUNET_DISK_get_handle_from_int_fd (sock);
        if (NULL != fhandle)
        {
          GNUNET_array_append (fhandles, fhandles_len, fhandle);
        }
        else
        {
          GNUNET_assert (0);
        }
      }
    }
  }
  *ntarget = nhandles_len > 0 ? nhandles : NULL;
  *ftarget = fhandles_len > 0 ? fhandles : NULL;
  *extracted_nhandles = nhandles_len;
  *extracted_fhandles = fhandles_len;
}

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select_add()

static int select_add ( void *  cls, struct GNUNET_SCHEDULER_Task *  task, struct GNUNET_SCHEDULER_FdInfo *  fdi  )

static

Definition at line 2454 of file scheduler.c.

References GNUNET_SCHEDULER_FdInfo::et, Scheduled::et, GNUNET_SCHEDULER_FdInfo::fd, Scheduled::fdi, GNUNET_SCHEDULER_FdInfo::fh, GNUNET_assert, GNUNET_CONTAINER_DLL_insert, GNUNET_new, GNUNET_OK, GNUNET_SCHEDULER_ET_IN, GNUNET_SCHEDULER_ET_OUT, GNUNET_SYSERR, DriverContext::scheduled_head, DriverContext::scheduled_tail, GNUNET_SCHEDULER_FdInfo::sock, and Scheduled::task.

Referenced by GNUNET_SCHEDULER_driver_select().

{
  struct DriverContext *context = cls;

  GNUNET_assert (NULL != context);
  GNUNET_assert (NULL != task);
  GNUNET_assert (NULL != fdi);
  GNUNET_assert (0 != (GNUNET_SCHEDULER_ET_IN & fdi->et) ||
                 0 != (GNUNET_SCHEDULER_ET_OUT & fdi->et));

  if (! ((NULL != fdi->fd) ^ (NULL != fdi->fh)) || (fdi->sock < 0))
  {
    /* exactly one out of {fd, hf} must be != NULL and the OS handle must be valid */
    return GNUNET_SYSERR;
  }

  struct Scheduled *scheduled = GNUNET_new (struct Scheduled);
  scheduled->task = task;
  scheduled->fdi = fdi;
  scheduled->et = fdi->et;

  GNUNET_CONTAINER_DLL_insert (context->scheduled_head,
                               context->scheduled_tail,
                               scheduled);
  return GNUNET_OK;
}

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select_del()

static int select_del ( void *  cls, struct GNUNET_SCHEDULER_Task *  task  )

static

Definition at line 2485 of file scheduler.c.

References context, GNUNET_assert, GNUNET_CONTAINER_DLL_remove, GNUNET_free, GNUNET_OK, GNUNET_SYSERR, Scheduled::next, ret, DriverContext::scheduled_head, DriverContext::scheduled_tail, and Scheduled::task.

Referenced by GNUNET_SCHEDULER_driver_select().

{
  struct DriverContext *context;
  struct Scheduled *pos;
  int ret;

  GNUNET_assert (NULL != cls);

  context = cls;
  ret = GNUNET_SYSERR;
  pos = context->scheduled_head;
  while (NULL != pos)
  {
    struct Scheduled *next = pos->next;
    if (pos->task == task)
    {
      GNUNET_CONTAINER_DLL_remove (context->scheduled_head,
                                   context->scheduled_tail,
                                   pos);
      GNUNET_free (pos);
      ret = GNUNET_OK;
    }
    pos = next;
  }
  return ret;
}

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select_set_wakeup()

static void select_set_wakeup ( void *  cls, struct GNUNET_TIME_Absolute  dt  )

static

Definition at line 2515 of file scheduler.c.

References GNUNET_assert, and DriverContext::timeout.

Referenced by GNUNET_SCHEDULER_driver_select().

{
  struct DriverContext *context = cls;

  GNUNET_assert (NULL != context);
  context->timeout = dt;
}

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Variable Documentation

scheduler_driver

const struct GNUNET_SCHEDULER_Driver* scheduler_driver

static

The driver used for the event loop.

Will be handed over to the scheduler in GNUNET_SCHEDULER_do_work(), persisted there in this variable for later use in functions like GNUNET_SCHEDULER_add_select(), add_without_sets() and GNUNET_SCHEDULER_cancel().

Definition at line 311 of file scheduler.c.

pending_head

struct GNUNET_SCHEDULER_Task* pending_head

static

Head of list of tasks waiting for an event.

Definition at line 316 of file scheduler.c.

Referenced by GNUNET_SCHEDULER_do_work().

pending_tail

struct GNUNET_SCHEDULER_Task* pending_tail

static

Tail of list of tasks waiting for an event.

Definition at line 321 of file scheduler.c.

shutdown_head

struct GNUNET_SCHEDULER_Task* shutdown_head

static

Head of list of tasks waiting for shutdown.

Definition at line 326 of file scheduler.c.

shutdown_tail

struct GNUNET_SCHEDULER_Task* shutdown_tail

static

Tail of list of tasks waiting for shutdown.

Definition at line 331 of file scheduler.c.

pending_timeout_head

struct GNUNET_SCHEDULER_Task* pending_timeout_head

static

List of tasks waiting ONLY for a timeout event.

Sorted by timeout (earliest first). Used so that we do not traverse the list of these tasks when building select sets (we just look at the head to determine the respective timeout ONCE).

Definition at line 340 of file scheduler.c.

Referenced by get_timeout(), GNUNET_SCHEDULER_add_at_with_priority(), and GNUNET_SCHEDULER_do_work().

pending_timeout_tail

struct GNUNET_SCHEDULER_Task* pending_timeout_tail

static

List of tasks waiting ONLY for a timeout event.

Sorted by timeout (earliest first). Used so that we do not traverse the list of these tasks when building select sets (we just look at the head to determine the respective timeout ONCE).

Definition at line 349 of file scheduler.c.

pending_timeout_last

struct GNUNET_SCHEDULER_Task* pending_timeout_last

static

Last inserted task waiting ONLY for a timeout event.

Used to (heuristically) speed up insertion.

Definition at line 355 of file scheduler.c.

Referenced by GNUNET_SCHEDULER_add_at_with_priority().

active_task

struct GNUNET_SCHEDULER_Task* active_task

static

ID of the task that is running right now.

Definition at line 360 of file scheduler.c.

ready_head

struct GNUNET_SCHEDULER_Task* ready_head[GNUNET_SCHEDULER_PRIORITY_COUNT]

static

Head of list of tasks ready to run right now, grouped by importance.

Definition at line 365 of file scheduler.c.

ready_tail

struct GNUNET_SCHEDULER_Task* ready_tail[GNUNET_SCHEDULER_PRIORITY_COUNT]

static

Tail of list of tasks ready to run right now, grouped by importance.

Definition at line 371 of file scheduler.c.

install_parent_control_task

struct GNUNET_SCHEDULER_Task* install_parent_control_task

static

Task for installing parent control handlers (it might happen that the scheduler is shutdown before this task is executed, so GNUNET_SCHEDULER_shutdown must cancel it in that case)

Definition at line 379 of file scheduler.c.

shutdown_pipe_task

struct GNUNET_SCHEDULER_Task* shutdown_pipe_task

static

Task for reading from a pipe that signal handlers will use to initiate shutdown.

Definition at line 385 of file scheduler.c.

ready_count

unsigned int ready_count

static

Number of tasks on the ready list.

Definition at line 390 of file scheduler.c.

Referenced by GNUNET_SCHEDULER_cancel(), GNUNET_SCHEDULER_do_work(), GNUNET_SCHEDULER_get_load(), queue_ready_task(), select_loop(), and shutdown_if_no_lifeness().

current_priority

enum GNUNET_SCHEDULER_Priority current_priority

static

Priority of the task running right now.

Only valid while a task is running.

Definition at line 396 of file scheduler.c.

Referenced by add_without_sets(), GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_add_select(), GNUNET_SCHEDULER_do_work(), GNUNET_SCHEDULER_driver_init(), and GNUNET_SCHEDULER_get_load().

max_priority_added

enum GNUNET_SCHEDULER_Priority max_priority_added

static

Priority of the highest task added in the current select iteration.

Definition at line 402 of file scheduler.c.

Referenced by add_without_sets(), GNUNET_SCHEDULER_add_select(), and GNUNET_SCHEDULER_do_work().

current_lifeness

int current_lifeness

static

Value of the 'lifeness' flag for the current task.

Definition at line 407 of file scheduler.c.

Referenced by add_without_sets(), GNUNET_SCHEDULER_add_at_with_priority(), GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_add_select(), GNUNET_SCHEDULER_add_with_reason_and_priority(), GNUNET_SCHEDULER_do_work(), and GNUNET_SCHEDULER_driver_init().

work_priority

enum GNUNET_SCHEDULER_Priority work_priority

static

Priority used currently in GNUNET_SCHEDULER_do_work().

Definition at line 412 of file scheduler.c.

Referenced by GNUNET_SCHEDULER_add_at_with_priority(), and GNUNET_SCHEDULER_do_work().

scheduler_select

GNUNET_SCHEDULER_select scheduler_select

static

Function to use as a select() in the scheduler.

If NULL, we use GNUNET_NETWORK_socket_select().

Definition at line 418 of file scheduler.c.

Referenced by GNUNET_SCHEDULER_set_select(), and select_loop().

tc

struct GNUNET_SCHEDULER_TaskContext tc

static

Task context of the current task.

Definition at line 423 of file scheduler.c.

Referenced by add_to_tc(), check_add_address(), check_add_queue_message(), check_client_send(), check_communicator_available(), check_incoming_msg(), child_death_task(), client_connect_cb(), client_disconnect_cb(), client_send_response(), cmd_read(), connect_probe_continuation(), cores_send_connect_info(), cores_send_disconnect_info(), do_blacklist_check(), do_read(), do_s5r_read(), do_udp_read(), free_address_list_entry(), free_pending_message(), free_queue(), GNUNET_SCHEDULER_do_work(), GNUNET_SCHEDULER_get_task_context(), GST_blacklist_test_allowed(), GST_clients_broadcast(), GST_clients_broadcast_peer_notification(), handle_add_address(), handle_add_queue_message(), handle_backchannel_encapsulation(), handle_client_address_to_string(), handle_client_blacklist_init(), handle_client_blacklist_reply(), handle_client_hello(), handle_client_monitor_peers(), handle_client_monitor_plugins(), handle_client_recv_ok(), handle_client_send(), handle_client_set_metric(), handle_client_start(), handle_communicator_available(), handle_communicator_backchannel(), handle_del_address(), handle_del_queue_message(), handle_incoming_msg(), handle_monitor_start(), handle_queue_create_fail(), handle_queue_create_ok(), handle_raw_message(), handle_request_hello_validation(), handle_send_message_ack(), handle_suggest(), handle_suggest_cancel(), handle_update_queue_message(), lookup_communicator(), maint_child_death(), mark_match_down(), migrate_and_drop_keywords(), migrate_and_drop_metadata(), notify_client_about_neighbour(), notify_client_connect_info(), notify_client_queues(), notify_monitors(), process_listen_socket(), read_dns4(), read_dns6(), read_response(), receive_ready(), remove_high_frequency_keywords(), stop_peer_request(), suggest_to_connect(), tcp_send(), tokenized_cb(), transmit_kx(), transmit_ready(), udp_plugin_select_v4(), udp_plugin_select_v6(), unix_plugin_select_read(), and unix_plugin_select_write().

scheduler_select_cls

void* scheduler_select_cls

static

Closure for scheduler_select.

Definition at line 428 of file scheduler.c.

Referenced by GNUNET_SCHEDULER_set_select(), and select_loop().

shutdown_pipe_handle

struct GNUNET_DISK_PipeHandle* shutdown_pipe_handle

static

Pipe used to communicate shutdown via signal.

Definition at line 624 of file scheduler.c.

my_pid

pid_t my_pid

static

Process ID of this process at the time we installed the various signal handlers.

Definition at line 630 of file scheduler.c.

Referenced by GNUNET_SCHEDULER_driver_init(), and sighandler_shutdown().