Mercurial > hg > nginx-quic
view src/os/unix/ngx_process_cycle.c @ 330:377a955421dc
nginx-0.0.3-2004-04-29-20:34:26 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Thu, 29 Apr 2004 16:34:26 +0000 |
parents | 9a0ffa21f193 |
children | fade4edd61f8 |
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#include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #include <nginx.h> static void ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n, ngx_int_t type); static void ngx_signal_worker_processes(ngx_cycle_t *cycle, int signo); static void ngx_master_exit(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx); static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data); #if (NGX_THREADS) static int ngx_worker_thread_cycle(void *data); #endif ngx_uint_t ngx_process; ngx_pid_t ngx_pid; ngx_uint_t ngx_threaded; sig_atomic_t ngx_reap; sig_atomic_t ngx_timer; sig_atomic_t ngx_terminate; sig_atomic_t ngx_quit; ngx_uint_t ngx_exiting; sig_atomic_t ngx_reconfigure; sig_atomic_t ngx_reopen; sig_atomic_t ngx_change_binary; ngx_pid_t ngx_new_binary; ngx_uint_t ngx_inherited; sig_atomic_t ngx_noaccept; ngx_uint_t ngx_noaccepting; ngx_uint_t ngx_restart; u_char master_process[] = "master process"; void ngx_master_process_cycle(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx) { char *title; u_char *p; size_t size; ngx_int_t n; ngx_uint_t i; sigset_t set; struct timeval tv; struct itimerval itv; ngx_uint_t live; ngx_msec_t delay; ngx_core_conf_t *ccf; sigemptyset(&set); sigaddset(&set, SIGCHLD); sigaddset(&set, SIGALRM); sigaddset(&set, SIGINT); sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL)); sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL)); sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL)); sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL)); sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL)); sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL)); if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) { ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, "sigprocmask() failed"); } sigemptyset(&set); size = sizeof(master_process); for (n = 0; n < ctx->argc; n++) { size += ngx_strlen(ctx->argv[n]) + 1; } title = ngx_palloc(cycle->pool, size); p = ngx_cpymem(title, master_process, sizeof(master_process) - 1); for (n = 0; n < ctx->argc; n++) { *p++ = ' '; p = ngx_cpystrn(p, (u_char *) ctx->argv[n], size); } ngx_setproctitle(title); ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module); ngx_start_worker_processes(cycle, ccf->worker_processes, NGX_PROCESS_RESPAWN); ngx_new_binary = 0; delay = 0; live = 1; for ( ;; ) { if (delay) { delay *= 2; ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "temination cycle: %d", delay); itv.it_interval.tv_sec = 0; itv.it_interval.tv_usec = 0; itv.it_value.tv_sec = delay / 1000; itv.it_value.tv_usec = (delay % 1000 ) * 1000; if (setitimer(ITIMER_REAL, &itv, NULL) == -1) { ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, "setitimer() failed"); } } ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "sigsuspend"); sigsuspend(&set); ngx_gettimeofday(&tv); ngx_time_update(tv.tv_sec); ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "wake up"); if (ngx_reap) { ngx_reap = 0; ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap childs"); live = 0; for (i = 0; i < ngx_last_process; i++) { ngx_log_debug6(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "child: " PID_T_FMT " e:%d t:%d d:%d r:%d j:%d", 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].exited) { 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) { ngx_processes[i--] = ngx_processes[ngx_last_process]; } } else if (ngx_processes[i].exiting || !ngx_processes[i].detached) { live = 1; } } } if (!live && (ngx_terminate || ngx_quit)) { ngx_master_exit(cycle, ctx); } if (ngx_terminate) { if (delay == 0) { delay = 50; } if (delay > 1000) { ngx_signal_worker_processes(cycle, SIGKILL); } else { ngx_signal_worker_processes(cycle, ngx_signal_value(NGX_TERMINATE_SIGNAL)); } continue; } if (ngx_quit) { ngx_signal_worker_processes(cycle, ngx_signal_value(NGX_SHUTDOWN_SIGNAL)); continue; } if (ngx_timer) { ngx_timer = 0; ngx_start_worker_processes(cycle, ccf->worker_processes, NGX_PROCESS_JUST_RESPAWN); live = 1; ngx_signal_worker_processes(cycle, ngx_signal_value(NGX_SHUTDOWN_SIGNAL)); } if (ngx_reconfigure) { ngx_reconfigure = 0; if (ngx_new_binary) { ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "start new workers"); ngx_start_worker_processes(cycle, ccf->worker_processes, NGX_PROCESS_JUST_RESPAWN); continue; } ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reconfiguring"); cycle = ngx_init_cycle(cycle); if (cycle == NULL) { cycle = (ngx_cycle_t *) ngx_cycle; continue; } ngx_cycle = cycle; ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module); ngx_start_worker_processes(cycle, ccf->worker_processes, NGX_PROCESS_JUST_RESPAWN); live = 1; ngx_signal_worker_processes(cycle, ngx_signal_value(NGX_SHUTDOWN_SIGNAL)); } if (ngx_restart) { ngx_restart = 0; ngx_start_worker_processes(cycle, ccf->worker_processes, NGX_PROCESS_RESPAWN); live = 1; } if (ngx_reopen) { ngx_reopen = 0; ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopening logs"); ngx_reopen_files(cycle, ccf->user); ngx_signal_worker_processes(cycle, ngx_signal_value(NGX_REOPEN_SIGNAL)); } if (ngx_change_binary) { ngx_change_binary = 0; ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "changing binary"); ngx_new_binary = ngx_exec_new_binary(cycle, ctx->argv); } if (ngx_noaccept) { ngx_noaccept = 0; ngx_noaccepting = 1; ngx_signal_worker_processes(cycle, ngx_signal_value(NGX_SHUTDOWN_SIGNAL)); } } } void ngx_single_process_cycle(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx) { ngx_uint_t i; #if 0 ngx_setproctitle("single worker process"); #endif ngx_init_temp_number(); for (i = 0; ngx_modules[i]; i++) { if (ngx_modules[i]->init_process) { if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) { /* fatal */ exit(2); } } } for ( ;; ) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle"); ngx_process_events(cycle); if (ngx_terminate || ngx_quit) { ngx_master_exit(cycle, ctx); } if (ngx_reconfigure) { ngx_reconfigure = 0; ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reconfiguring"); cycle = ngx_init_cycle(cycle); if (cycle == NULL) { cycle = (ngx_cycle_t *) ngx_cycle; continue; } ngx_cycle = cycle; } if (ngx_reopen) { ngx_reopen = 0; ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopening logs"); ngx_reopen_files(cycle, (ngx_uid_t) -1); } } } static void ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n, ngx_int_t type) { struct itimerval itv; ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "start worker processes"); while (n--) { ngx_spawn_process(cycle, ngx_worker_process_cycle, NULL, "worker process", type); } /* * 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_worker_processes(ngx_cycle_t *cycle, int signo) { ngx_uint_t i; ngx_err_t err; for (i = 0; i < ngx_last_process; i++) { if (ngx_processes[i].detached) { continue; } if (ngx_processes[i].just_respawn) { ngx_processes[i].just_respawn = 0; continue; } if (ngx_processes[i].exiting && signo == ngx_signal_value(NGX_SHUTDOWN_SIGNAL)) { continue; } ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0, "kill (" PID_T_FMT ", %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(%d, %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 void ngx_master_exit(ngx_cycle_t *cycle, ngx_master_ctx_t *ctx) { ngx_delete_pidfile(cycle); ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exit"); ngx_destroy_pool(cycle->pool); exit(0); } static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data) { sigset_t set; ngx_uint_t i; ngx_listening_t *ls; ngx_core_conf_t *ccf; #if (NGX_THREADS) ngx_tid_t tid; #endif ngx_process = NGX_PROCESS_WORKER; ngx_last_process = 0; ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module); if (ccf->group != (gid_t) NGX_CONF_UNSET) { if (setuid(ccf->group) == -1) { ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno, "setgid(%d) failed", ccf->group); /* fatal */ exit(2); } } if (ccf->user != (uid_t) NGX_CONF_UNSET && geteuid() == 0) { if (setuid(ccf->user) == -1) { ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno, "setuid(%d) failed", ccf->user); /* fatal */ exit(2); } } #if (HAVE_PR_SET_DUMPABLE) /* allow coredump after setuid() in Linux 2.4.x */ if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) == -1) { ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, "prctl(PR_SET_DUMPABLE) failed"); } #endif sigemptyset(&set); if (sigprocmask(SIG_SETMASK, &set, NULL) == -1) { ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, "sigprocmask() failed"); } ngx_init_temp_number(); /* * disable deleting previous events for the listening sockets because * in the worker processes there are no events at all at this point */ ls = cycle->listening.elts; for (i = 0; i < cycle->listening.nelts; i++) { ls[i].remain = 0; } for (i = 0; ngx_modules[i]; i++) { if (ngx_modules[i]->init_process) { if (ngx_modules[i]->init_process(cycle) == NGX_ERROR) { /* fatal */ exit(2); } } } ngx_setproctitle("worker process"); #if (NGX_THREADS) if (ngx_init_threads(5, 128 * 1024 * 1024, cycle) == NGX_ERROR) { /* fatal */ exit(2); } for (i = 0; i < 1; i++) { if (ngx_create_thread(&tid, ngx_worker_thread_cycle, cycle, cycle->log) != 0) { /* fatal */ exit(2); } } #endif for ( ;; ) { if (ngx_exiting && ngx_event_timer_rbtree == &ngx_event_timer_sentinel) { ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting"); ngx_destroy_pool(cycle->pool); exit(0); } ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle"); ngx_process_events(cycle); if (ngx_terminate) { ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting"); ngx_destroy_pool(cycle->pool); exit(0); } if (ngx_quit) { ngx_quit = 0; ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "gracefully shutting down"); ngx_setproctitle("worker process is shutting down"); if (!ngx_exiting) { ngx_close_listening_sockets(cycle); ngx_exiting = 1; } } if (ngx_reopen) { ngx_reopen = 0; ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopen logs"); ngx_reopen_files(cycle, -1); } } } #if (NGX_THREADS) int ngx_worker_thread_cycle(void *data) { ngx_cycle_t *cycle = data; ngx_err_t err; sigset_t set; struct timeval tv; sigfillset(&set); sigdelset(&set, SIGALRM); sigdelset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL)); sigdelset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL)); err = ngx_thread_sigmask(SIG_BLOCK, &set, NULL); if (err) { ngx_log_error(NGX_LOG_ALERT, cycle->log, err, ngx_thread_sigmask_n " failed"); return 1; } /* STUB */ ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, ngx_errno, "thread %d started", ngx_thread_self()); ngx_setproctitle("worker thread"); sleep(5); ngx_gettimeofday(&tv); ngx_time_update(tv.tv_sec); ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, ngx_errno, "thread %d done", ngx_thread_self()); return 1; } #endif