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