transmission/libtransmission/trevent.c

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/*
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* This file Copyright (C) 2007-2008 Charles Kerr <charles@rebelbase.com>
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
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*
* $Id$
*/
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#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <signal.h>
#include <event.h>
#include <evhttp.h>
#include "transmission.h"
#include "list.h"
#include "platform.h"
#include "trevent.h"
#include "utils.h"
/* #define DEBUG */
#ifdef DEBUG
#include <stdio.h>
#undef tr_dbg
#define tr_dbg( a, b... ) fprintf(stderr, a "\n", ##b )
#endif
/***
****
***/
typedef struct tr_event_handle
{
tr_lock * lock;
tr_handle * h;
tr_thread * thread;
tr_list * commands;
struct event_base * base;
struct event pulse;
struct timeval pulseInterval;
uint8_t die;
int timerCount;
}
tr_event_handle;
#ifdef DEBUG
static int reads = 0;
static int writes = 0;
#endif
enum mode
{
TR_EV_TIMER_ADD,
TR_EV_EXEC
};
typedef int timer_func(void*);
struct tr_timer
{
struct event event;
struct timeval tv;
timer_func * func;
void * user_data;
struct tr_event_handle * eh;
uint8_t inCallback;
};
struct tr_event_command
{
int mode;
struct tr_timer * timer;
struct evhttp_connection * evcon;
struct evhttp_request * req;
enum evhttp_cmd_type evtype;
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char * uri;
struct bufferevent * bufev;
short enable;
short disable;
char * buf;
size_t buflen;
void (*func)( void* );
void * user_data;
};
static void
pumpList( int i UNUSED, short s UNUSED, void * veh )
{
tr_event_handle * eh = veh;
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int doDie;
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for( ;; )
{
struct tr_event_command * cmd;
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doDie = eh->die && !eh->timerCount;
if( doDie )
break;
/* get the next command */
tr_lockLock( eh->lock );
cmd = tr_list_pop_front( &eh->commands );
tr_lockUnlock( eh->lock );
if( cmd == NULL )
break;
/* process the command */
switch( cmd->mode )
{
case TR_EV_TIMER_ADD:
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evtimer_add( &cmd->timer->event, &cmd->timer->tv );
++eh->timerCount;
break;
case TR_EV_EXEC:
(cmd->func)( cmd->user_data );
break;
default:
assert( 0 && "unhandled command type!" );
}
/* cleanup */
tr_free( cmd );
}
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if( !doDie )
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evtimer_add( &eh->pulse, &eh->pulseInterval );
else {
assert( eh->timerCount == 0 );
event_del( &eh->pulse );
}
}
static void
logFunc( int severity, const char * message )
{
if( severity >= _EVENT_LOG_ERR )
tr_nerr( "%s", message );
else
tr_ndbg( "%s", message );
}
static void
libeventThreadFunc( void * veh )
{
tr_event_handle * eh = (tr_event_handle *) veh;
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tr_dbg( "Starting libevent thread" );
#ifndef WIN32
/* Don't exit when writing on a broken socket */
signal( SIGPIPE, SIG_IGN );
#endif
eh->base = event_init( );
event_set_log_callback( logFunc );
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evtimer_set( &eh->pulse, pumpList, veh );
evtimer_add( &eh->pulse, &eh->pulseInterval );
eh->h->events = eh;
event_dispatch( );
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tr_lockFree( eh->lock );
event_base_free( eh->base );
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eh->h->events = NULL;
tr_free( eh );
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tr_dbg( "Closing libevent thread" );
}
void
tr_eventInit( tr_handle * handle )
{
tr_event_handle * eh;
eh = tr_new0( tr_event_handle, 1 );
eh->lock = tr_lockNew( );
eh->h = handle;
eh->pulseInterval = tr_timevalMsec( 100 );
eh->thread = tr_threadNew( libeventThreadFunc, eh, "libeventThreadFunc" );
}
void
tr_eventClose( tr_handle * handle )
{
tr_event_handle * eh = handle->events;
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tr_lockLock( eh->lock );
tr_list_free( &eh->commands, tr_free );
eh->die = TRUE;
tr_lockUnlock( eh->lock );
}
/**
***
**/
static void
pushList( struct tr_event_handle * eh, struct tr_event_command * command )
{
tr_lockLock( eh->lock );
tr_list_append( &eh->commands, command );
tr_lockUnlock( eh->lock );
}
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int
tr_amInEventThread( struct tr_handle * handle )
{
return tr_amInThread( handle->events->thread );
}
/**
***
**/
static int
timerCompareFunc( const void * va, const void * vb )
{
const struct tr_event_command * a = va;
const struct tr_timer * b = vb;
return a->timer == b ? 0 : 1;
}
static void
timerCallback( int fd UNUSED, short event UNUSED, void * vtimer )
{
int more;
struct tr_timer * timer = vtimer;
void * del;
del = tr_list_remove( &timer->eh->commands, timer, timerCompareFunc );
if( del != NULL ) /* there's a TIMER_DEL command queued for this timer... */
more = FALSE;
else {
timer->inCallback = 1;
more = (*timer->func)( timer->user_data );
timer->inCallback = 0;
}
if( more )
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evtimer_add( &timer->event, &timer->tv );
else
tr_timerFree( &timer );
tr_free( del );
}
void
tr_timerFree( tr_timer ** ptimer )
{
tr_timer * timer;
/* zero out the argument passed in */
assert( ptimer );
timer = *ptimer;
*ptimer = NULL;
/* destroy the timer directly or via the command queue */
if( timer!=NULL && !timer->inCallback ) {
void * del;
assert( tr_amInEventThread( timer->eh->h ) );
del = tr_list_remove( &timer->eh->commands, timer, timerCompareFunc );
--timer->eh->timerCount;
event_del( &timer->event );
tr_free( timer );
tr_free( del );
}
}
tr_timer*
tr_timerNew( struct tr_handle * handle,
timer_func func,
void * user_data,
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uint64_t interval_milliseconds )
{
tr_timer * timer = tr_new0( tr_timer, 1 );
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timer->tv = tr_timevalMsec( interval_milliseconds );
timer->func = func;
timer->user_data = user_data;
timer->eh = handle->events;
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evtimer_set( &timer->event, timerCallback, timer );
if( tr_amInThread( handle->events->thread ) ) {
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evtimer_add( &timer->event, &timer->tv );
++handle->events->timerCount;
} else {
struct tr_event_command * cmd = tr_new0( struct tr_event_command, 1 );
cmd->mode = TR_EV_TIMER_ADD;
cmd->timer = timer;
pushList( handle->events, cmd );
}
return timer;
}
void
tr_runInEventThread( struct tr_handle * handle,
void func( void* ),
void * user_data )
{
if( tr_amInThread( handle->events->thread ) )
(func)( user_data );
else {
struct tr_event_command * cmd = tr_new0( struct tr_event_command, 1 );
cmd->mode = TR_EV_EXEC;
cmd->func = func;
cmd->user_data = user_data;
pushList( handle->events, cmd );
}
}