static void
ngx_pass_open_channel(ngx_cycle_t *cycle, ngx_channel_t *ch)
{
ngx_int_t i;
for (i = 0; i < ngx_last_process; i++) {
if (i == ngx_process_slot
|| ngx_processes[i].pid == -1
|| ngx_processes[i].channel[0] == -1)
{
continue;
}
ngx_log_debug6(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"pass channel s:%d pid:%P fd:%d to s:%i pid:%P fd:%d",
ch->slot, ch->pid, ch->fd,
i, ngx_processes[i].pid,
ngx_processes[i].channel[0]);
/* TODO: NGX_AGAIN */
ngx_write_channel(ngx_processes[i].channel[0],
ch, sizeof(ngx_channel_t), cycle->log);
}
}
/* 将刚创建的子进程的消息发送给其他所有的子进程，特别是进程的pid
* 和进程通信的socket文件描述符以及进程在进程数组中的索引
*/
static void
ngx_pass_open_channel(ngx_cycle_t *cycle, ngx_channel_t *ch)
{
ngx_int_t i;
/* 将ch信息发送给其他的所有存活进程 */
for (i = 0; i < ngx_last_process; i++) {
if (i == ngx_process_slot
|| ngx_processes[i].pid == -1
|| ngx_processes[i].channel[0] == -1)
{
continue;
}
ngx_log_debug6(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"pass channel s:%d pid:%P fd:%d to s:%i pid:%P fd:%d",
ch->slot, ch->pid, ch->fd,
i, ngx_processes[i].pid,
ngx_processes[i].channel[0]);
/* TODO: NGX_AGAIN */
/* 为啥是向其他进程的0通道发送?
* 进程的1通道都是用来读取的，0通道都是其他进程用来写的，
* 和进程进行通信的
*/
ngx_write_channel(ngx_processes[i].channel[0],
ch, sizeof(ngx_channel_t), cycle->log);
}
}
static void ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n,
ngx_int_t type)
{
ngx_int_t i;
ngx_channel_t ch;
struct itimerval itv;
ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "start worker processes");
ch.command = NGX_CMD_OPEN_CHANNEL;
while (n--) {
ngx_spawn_process(cycle, ngx_worker_process_cycle, NULL,
"worker process", type);
ch.pid = ngx_processes[ngx_process_slot].pid;
ch.slot = ngx_process_slot;
ch.fd = ngx_processes[ngx_process_slot].channel[0];
for (i = 0; i < ngx_last_process; i++) {
if (i == ngx_process_slot
|| ngx_processes[i].pid == -1
|| ngx_processes[i].channel[0] == -1)
{
continue;
}
ngx_log_debug6(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"pass channel s:%d pid:" PID_T_FMT
" fd:%d to s:%d pid:" PID_T_FMT " fd:%d",
ch.slot, ch.pid, ch.fd,
i, ngx_processes[i].pid,
ngx_processes[i].channel[0]);
/* TODO: NGX_AGAIN */
ngx_write_channel(ngx_processes[i].channel[0],
&ch, sizeof(ngx_channel_t), cycle->log);
}
}
/*
* we have to limit the maximum life time of the worker processes
* by 10 days because our millisecond event timer is limited
* by 24 days on 32-bit platforms
*/
itv.it_interval.tv_sec = 0;
itv.it_interval.tv_usec = 0;
itv.it_value.tv_sec = 10 * 24 * 60 * 60;
itv.it_value.tv_usec = 0;
if (setitimer(ITIMER_REAL, &itv, NULL) == -1) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
"setitimer() failed");
}
}
static void
ngx_signal_pipe_broken(ngx_log_t *log, ngx_pid_t pid)
{
ngx_int_t i;
ngx_channel_t ch;
ch.fd = -1;
ch.pid = pid;
ch.command = NGX_CMD_PIPE_BROKEN;
for (i = 0; i < ngx_last_process; i++) {
if (ngx_processes[i].detached || ngx_processes[i].pid == -1) {
continue;
}
ngx_write_channel(ngx_processes[i].channel[0],
&ch, sizeof(ngx_channel_t), log);
}
}
ngx_int_t ngx_http_push_alert_worker(ngx_pid_t pid, ngx_int_t slot, ngx_log_t *log) {
//seems ch doesn't need to have fd set. odd, but roll with it. pid and process slot also unnecessary.
static ngx_channel_t ch = {NGX_CMD_HTTP_PUSH_CHECK_MESSAGES, 0, 0, -1};
return ngx_write_channel(ngx_http_push_socketpairs[slot][0], &ch, sizeof(ngx_channel_t), log);
}
static ngx_uint_t
ngx_reap_children(ngx_cycle_t *cycle)
{
ngx_int_t i, n;
ngx_uint_t live;
ngx_channel_t ch;
ngx_core_conf_t *ccf;
ngx_memzero(&ch, sizeof(ngx_channel_t));
ch.command = NGX_CMD_CLOSE_CHANNEL;
ch.fd = -1;
live = 0;
for (i = 0; i < ngx_last_process; i++) {
ngx_log_debug7(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"child: %d %P e:%d t:%d d:%d r:%d j:%d",
i,
ngx_processes[i].pid,
ngx_processes[i].exiting,
ngx_processes[i].exited,
ngx_processes[i].detached,
ngx_processes[i].respawn,
ngx_processes[i].just_spawn);
if (ngx_processes[i].pid == -1) {
continue;
}
if (ngx_processes[i].exited) {
if (!ngx_processes[i].detached) {
ngx_close_channel(ngx_processes[i].channel, cycle->log);
ngx_processes[i].channel[0] = -1;
ngx_processes[i].channel[1] = -1;
ch.pid = ngx_processes[i].pid;
ch.slot = i;
for (n = 0; n < ngx_last_process; n++) {
if (ngx_processes[n].exited
|| ngx_processes[n].pid == -1
|| ngx_processes[n].channel[0] == -1)
{
continue;
}
ngx_log_debug3(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"pass close channel s:%i pid:%P to:%P",
ch.slot, ch.pid, ngx_processes[n].pid);
/* TODO: NGX_AGAIN */
ngx_write_channel(ngx_processes[n].channel[0],
&ch, sizeof(ngx_channel_t), cycle->log);
}
}
if (ngx_processes[i].respawn
&& !ngx_processes[i].exiting
&& !ngx_terminate
&& !ngx_quit)
{
if (ngx_spawn_process(cycle, ngx_processes[i].proc,
ngx_processes[i].data,
ngx_processes[i].name, i)
== NGX_INVALID_PID)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"could not respawn %s",
ngx_processes[i].name);
continue;
}
ch.command = NGX_CMD_OPEN_CHANNEL;
ch.pid = ngx_processes[ngx_process_slot].pid;
ch.slot = ngx_process_slot;
ch.fd = ngx_processes[ngx_process_slot].channel[0];
ngx_pass_open_channel(cycle, &ch);
live = 1;
continue;
}
if (ngx_processes[i].pid == ngx_new_binary) {
ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
ngx_core_module);
if (ngx_rename_file((char *) ccf->oldpid.data,
(char *) ccf->pid.data)
== NGX_FILE_ERROR)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
ngx_rename_file_n " %s back to %s failed "
"after the new binary process \"%s\" exited",
ccf->oldpid.data, ccf->pid.data, ngx_argv[0]);
}
ngx_new_binary = 0;
if (ngx_noaccepting) {
ngx_restart = 1;
ngx_noaccepting = 0;
}
}
if (i == ngx_last_process - 1) {
ngx_last_process--;
} else {
ngx_processes[i].pid = -1;
}
} else if (ngx_processes[i].exiting || !ngx_processes[i].detached) {
live = 1;
}
}
return live;
}
static void
ngx_signal_worker_processes(ngx_cycle_t *cycle, int signo)
{
ngx_int_t i;
ngx_err_t err;
ngx_channel_t ch;
ngx_memzero(&ch, sizeof(ngx_channel_t));
#if (NGX_BROKEN_SCM_RIGHTS)
ch.command = 0;
#else
switch (signo) {
case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
ch.command = NGX_CMD_QUIT;
break;
case ngx_signal_value(NGX_TERMINATE_SIGNAL):
ch.command = NGX_CMD_TERMINATE;
break;
case ngx_signal_value(NGX_REOPEN_SIGNAL):
ch.command = NGX_CMD_REOPEN;
break;
default:
ch.command = 0;
}
#endif
ch.fd = -1;
for (i = 0; i < ngx_last_process; i++) {
ngx_log_debug7(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"child: %d %P e:%d t:%d d:%d r:%d j:%d",
i,
ngx_processes[i].pid,
ngx_processes[i].exiting,
ngx_processes[i].exited,
ngx_processes[i].detached,
ngx_processes[i].respawn,
ngx_processes[i].just_spawn);
if (ngx_processes[i].detached || ngx_processes[i].pid == -1) {
continue;
}
if (ngx_processes[i].just_spawn) {
ngx_processes[i].just_spawn = 0;
continue;
}
if (ngx_processes[i].exiting
&& signo == ngx_signal_value(NGX_SHUTDOWN_SIGNAL))
{
continue;
}
if (ch.command) {
if (ngx_write_channel(ngx_processes[i].channel[0],
&ch, sizeof(ngx_channel_t), cycle->log)
== NGX_OK)
{
if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL)) {
ngx_processes[i].exiting = 1;
}
continue;
}
}
ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"kill (%P, %d)", ngx_processes[i].pid, signo);
if (kill(ngx_processes[i].pid, signo) == -1) {
err = ngx_errno;
ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
"kill(%P, %d) failed", ngx_processes[i].pid, signo);
if (err == NGX_ESRCH) {
ngx_processes[i].exited = 1;
ngx_processes[i].exiting = 0;
ngx_reap = 1;
}
continue;
}
if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL)) {
ngx_processes[i].exiting = 1;
}
}
}
static ngx_int_t
ngx_http_push_stream_alert_worker(ngx_pid_t pid, ngx_int_t slot, ngx_log_t *log, ngx_channel_t command)
{
return ngx_write_channel(ngx_http_push_stream_socketpairs[slot][0], &command, sizeof(ngx_channel_t), log);
}
static ngx_uint_t ngx_reap_childs(ngx_cycle_t *cycle)
{
ngx_int_t i, n;
ngx_uint_t live;
ngx_channel_t ch;
ch.command = NGX_CMD_CLOSE_CHANNEL;
ch.fd = -1;
live = 0;
for (i = 0; i < ngx_last_process; i++) {
ngx_log_debug7(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
"child: %d " PID_T_FMT " e:%d t:%d d:%d r:%d j:%d",
i,
ngx_processes[i].pid,
ngx_processes[i].exiting,
ngx_processes[i].exited,
ngx_processes[i].detached,
ngx_processes[i].respawn,
ngx_processes[i].just_respawn);
if (ngx_processes[i].pid == -1) {
continue;
}
if (ngx_processes[i].exited) {
if (!ngx_processes[i].detached) {
ngx_close_channel(ngx_processes[i].channel, cycle->log);
ngx_processes[i].channel[0] = -1;
ngx_processes[i].channel[1] = -1;
ch.pid = ngx_processes[i].pid;
ch.slot = i;
for (n = 0; n < ngx_last_process; n++) {
if (ngx_processes[n].exited
|| ngx_processes[n].pid == -1
|| ngx_processes[n].channel[0] == -1)
{
continue;
}
ngx_log_debug3(NGX_LOG_DEBUG_CORE, cycle->log, 0,
"pass close channel s:%d pid:" PID_T_FMT
" to:" PID_T_FMT, ch.slot, ch.pid, ngx_processes[n].pid);
/* TODO: NGX_AGAIN */
ngx_write_channel(ngx_processes[n].channel[0],
&ch, sizeof(ngx_channel_t), cycle->log);
}
}
if (ngx_processes[i].respawn
&& !ngx_processes[i].exiting
&& !ngx_terminate
&& !ngx_quit)
{
if (ngx_spawn_process(cycle, ngx_processes[i].proc,
ngx_processes[i].data,
ngx_processes[i].name, i)
== NGX_ERROR)
{
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"can not respawn %s", ngx_processes[i].name);
continue;
}
live = 1;
continue;
}
if (ngx_processes[i].pid == ngx_new_binary) {
ngx_new_binary = 0;
if (ngx_noaccepting) {
ngx_restart = 1;
ngx_noaccepting = 0;
}
}
if (i == ngx_last_process - 1) {
ngx_last_process--;
} else {
ngx_processes[i].pid = -1;
}
} else if (ngx_processes[i].exiting || !ngx_processes[i].detached) {
live = 1;
}
}
return live;
}
