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/**
* Copyright (C) 2014 Daniel-Constantin Mierla (asipto.com)
*
* This file is part of Extensible SIP Router, a free SIP server.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <errno.h>
#include "dprint.h"
#include "sr_module.h"
#include "ut.h"
#include "pt.h"
#include "cfg/cfg_struct.h"
#include "async_task.h"
static int _async_task_workers = 0;
static int _async_task_sockets[2];
int async_task_run(int idx);
/**
*
*/
int async_task_init_sockets(void)
{
if (socketpair(PF_UNIX, SOCK_DGRAM, 0, _async_task_sockets) < 0) {
LM_ERR("opening tasks dgram socket pair\n");
return -1;
}
LM_DBG("inter-process event notification sockets initialized\n");
return 0;
}
/**
*
*/
void async_task_close_sockets_child(void)
{
LM_DBG("closing the notification socket used by children\n");
close(_async_task_sockets[1]);
}
/**
*
*/
void async_task_close_sockets_parent(void)
{
LM_DBG("closing the notification socket used by parent\n");
close(_async_task_sockets[0]);
}
/**
*
*/
int async_task_init(void)
{
LM_DBG("start initializing asynk task framework\n");
if(_async_task_workers<=0)
return 0;
/* advertise new processes to core */
register_procs(_async_task_workers);
/* advertise new processes to cfg framework */
cfg_register_child(_async_task_workers);
return 0;
}
/**
*
*/
int async_task_initialized(void)
{
if(_async_task_workers<=0)
return 0;
return 1;
}
/**
*
*/
int async_task_child_init(int rank)
{
int pid;
int i;
if(_async_task_workers<=0)
return 0;
LM_DBG("child initializing asynk task framework\n");
if (rank==PROC_INIT) {
if(async_task_init_sockets()<0) {
LM_ERR("failed to initialize tasks sockets\n");
return -1;
}
return 0;
}
if(rank>0) {
async_task_close_sockets_parent();
return 0;
}
if (rank!=PROC_MAIN)
return 0;
for(i=0; i<_async_task_workers; i++) {
pid=fork_process(PROC_RPC, "Async Task Worker", 1);
if (pid<0)
return -1; /* error */
if(pid==0) {
/* child */
/* initialize the config framework */
if (cfg_child_init())
return -1;
/* main function for workers */
if(async_task_run(i+1)<0) {
LM_ERR("failed to initialize task worker process: %d\n", i);
return -1;
}
}
}
return 0;
}
/**
*
*/
int async_task_set_workers(int n)
{
if(_async_task_workers>0) {
LM_WARN("task workers already set\n");
return 0;
}
if(n<=0)
return 0;
_async_task_workers = n;
return 0;
}
/**
*
*/
int async_task_push(async_task_t *task)
{
int len;
if(_async_task_workers<=0)
return 0;
len = write(_async_task_sockets[1], &task, sizeof(async_task_t*));
if(len<=0) {
LM_ERR("failed to pass the task to asynk workers\n");
return -1;
}
LM_DBG("task sent [%p]\n", task);
return 0;
}
/**
*
*/
int async_task_run(int idx)
{
async_task_t *ptask;
int received;
LM_DBG("async task worker %d ready\n", idx);
for( ; ; ) {
if ((received = recvfrom(_async_task_sockets[0],
&ptask, sizeof(async_task_t*),
0, NULL, 0)) < 0) {
LM_ERR("failed to received task (%d: %s)\n", errno, strerror(errno));
continue;
}
if(received != sizeof(async_task_t*)) {
LM_ERR("invalid task size %d\n", received);
continue;
}
if(ptask->exec!=NULL) {
LM_DBG("task executed [%p] (%p/%p)\n", ptask,
ptask->exec, ptask->param);
ptask->exec(ptask->param);
}
shm_free(ptask);
}
return 0;
}
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