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>
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#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <signal.h>
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#ifdef WIN32
#include <fcntl.h>
#define pipe(f) _pipe(f, 1000, _O_BINARY)
#else
#include <unistd.h>
#endif
#include <event.h>
#include "transmission.h"
#include "platform.h"
#include "trevent.h"
#include "utils.h"
/***
****
***/
typedef struct tr_event_handle
{
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uint8_t die;
int fds[2];
tr_lock * lock;
tr_handle * h;
tr_thread * thread;
struct event_base * base;
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struct event pipeEvent;
}
tr_event_handle;
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;
};
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struct tr_run_data
{
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void (*func)( void * );
void * user_data;
};
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#define dbgmsg(fmt...) tr_deepLog( __FILE__, __LINE__, "event", ##fmt )
static void
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readFromPipe( int fd, short eventType, void * veh )
{
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char ch;
int ret;
tr_event_handle * eh = veh;
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dbgmsg( "readFromPipe: eventType is %hd", eventType );
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/* read the command type */
ch = '\0';
do {
ret = read( fd, &ch, 1 );
} while( !eh->die && ret<0 && errno==EAGAIN );
dbgmsg( "command is [%c], ret is %d, errno is %d", ch, ret, (int)errno );
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switch( ch )
{
case 'r': /* run in libevent thread */
{
struct tr_run_data data;
const size_t nwant = sizeof( data );
const ssize_t ngot = read( fd, &data, nwant );
if( !eh->die && ( ngot == (ssize_t)nwant ) ) {
dbgmsg( "invoking function in libevent thread" );
(data.func)( data.user_data );
}
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break;
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}
case 't': /* create timer */
{
tr_timer * timer;
const size_t nwant = sizeof( timer );
const ssize_t ngot = read( fd, &timer, nwant );
if( !eh->die && ( ngot == (ssize_t)nwant ) ) {
dbgmsg( "adding timer in libevent thread" );
evtimer_add( &timer->event, &timer->tv );
}
break;
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}
case '\0': /* eof */
{
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dbgmsg( "pipe eof reached... removing event listener" );
event_del( &eh->pipeEvent );
break;
}
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default:
{
assert( 0 && "unhandled command type!" );
break;
}
}
}
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( );
eh->h->events = eh;
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event_set_log_callback( logFunc );
/* listen to the pipe's read fd */
event_set( &eh->pipeEvent, eh->fds[0], EV_READ|EV_PERSIST, readFromPipe, veh );
event_add( &eh->pipeEvent, NULL );
event_dispatch( );
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tr_lockFree( eh->lock );
event_base_free( eh->base );
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( );
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pipe( eh->fds );
eh->h = handle;
eh->thread = tr_threadNew( libeventThreadFunc, eh, "libeventThreadFunc" );
}
void
tr_eventClose( tr_handle * handle )
{
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handle->events->die = TRUE;
tr_deepLog( __FILE__, __LINE__, NULL, "closing trevent pipe" );
close( handle->events->fds[1] );
}
/**
***
**/
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int
tr_amInEventThread( struct tr_handle * handle )
{
return tr_amInThread( handle->events->thread );
}
/**
***
**/
static void
timerCallback( int fd UNUSED, short event UNUSED, void * vtimer )
{
int more;
struct tr_timer * timer = vtimer;
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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 );
}
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 */
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if( timer && !timer->inCallback )
{
assert( tr_amInEventThread( timer->eh->h ) );
event_del( &timer->event );
tr_free( timer );
}
}
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 );
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if( tr_amInThread( handle->events->thread ) )
{
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evtimer_add( &timer->event, &timer->tv );
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}
else
{
const char ch = 't';
int fd = handle->events->fds[1];
tr_lock * lock = handle->events->lock;
tr_lockLock( lock );
write( fd, &ch, 1 );
write( fd, &timer, sizeof(timer) );
tr_lockUnlock( lock );
}
return timer;
}
void
tr_runInEventThread( struct tr_handle * handle,
void func( void* ),
void * user_data )
{
if( tr_amInThread( handle->events->thread ) )
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{
(func)( user_data );
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}
else
{
const char ch = 'r';
int fd = handle->events->fds[1];
tr_lock * lock = handle->events->lock;
struct tr_run_data data;
tr_lockLock( lock );
write( fd, &ch, 1 );
data.func = func;
data.user_data = user_data;
write( fd, &data, sizeof(data) );
tr_lockUnlock( lock );
}
}