2013-06-26 11:18:32 +02:00
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/*
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* Copyright (c) 2013 Joris Vink <joris@coders.se>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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2013-06-26 16:37:22 +02:00
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#include <sys/shm.h>
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2013-06-26 11:18:32 +02:00
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#include <sys/wait.h>
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#include <grp.h>
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2013-07-06 20:55:22 +02:00
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#include <pwd.h>
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2013-06-26 11:18:32 +02:00
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#include <signal.h>
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#include "kore.h"
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#include "http.h"
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2013-06-27 08:43:07 +02:00
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//#define WORKER_DEBUG 1
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2013-06-27 00:22:48 +02:00
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#if defined(WORKER_DEBUG)
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#define worker_debug(fmt, ...) printf(fmt, ##__VA_ARGS__)
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2013-06-26 16:37:22 +02:00
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#else
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2013-06-27 00:22:48 +02:00
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#define worker_debug(fmt, ...)
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2013-06-26 16:37:22 +02:00
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#endif
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2013-06-27 00:22:48 +02:00
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#define KORE_SHM_KEY 15000
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#define WORKER(id) \
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2013-06-27 08:43:07 +02:00
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(struct kore_worker *)(kore_workers + (sizeof(struct kore_worker) * id))
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2013-06-27 00:22:48 +02:00
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struct wlock {
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pid_t lock;
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pid_t next;
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pid_t current;
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u_int16_t workerid;
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};
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static int worker_trylock(void);
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static int worker_unlock(void);
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static void worker_decide_next(void);
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2013-06-26 16:37:22 +02:00
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static void kore_worker_acceptlock_obtain(void);
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static void kore_worker_acceptlock_release(void);
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2013-06-26 11:18:32 +02:00
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static TAILQ_HEAD(, connection) disconnected;
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static TAILQ_HEAD(, connection) worker_clients;
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2013-06-27 00:22:48 +02:00
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static struct kore_worker *kore_workers;
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2013-06-26 16:37:22 +02:00
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static int shm_accept_key;
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2013-06-27 08:43:07 +02:00
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static struct wlock *accept_lock;
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2013-06-26 11:18:32 +02:00
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2013-06-26 16:37:22 +02:00
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extern volatile sig_atomic_t sig_recv;
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struct kore_worker *worker = NULL;
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u_int32_t worker_max_connections = 250;
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2013-06-27 00:22:48 +02:00
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u_int32_t worker_active_connections = 0;
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2013-06-26 11:18:32 +02:00
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void
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kore_worker_init(void)
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{
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2013-06-27 00:22:48 +02:00
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size_t len;
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2013-06-26 11:18:32 +02:00
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u_int16_t i, cpu;
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if (worker_count == 0)
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fatal("no workers specified");
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2013-06-27 00:22:48 +02:00
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len = sizeof(*accept_lock) +
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(sizeof(struct kore_worker) * worker_count);
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shm_accept_key = shmget(KORE_SHM_KEY, len, IPC_CREAT | IPC_EXCL | 0700);
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2013-06-26 16:37:22 +02:00
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if (shm_accept_key == -1)
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fatal("kore_worker_init(): shmget() %s", errno_s);
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2013-06-27 00:22:48 +02:00
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if ((accept_lock = shmat(shm_accept_key, NULL, 0)) == NULL)
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2013-06-26 16:37:22 +02:00
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fatal("kore_worker_init(): shmat() %s", errno_s);
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2013-06-27 00:22:48 +02:00
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accept_lock->lock = 0;
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accept_lock->current = 0;
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accept_lock->workerid = 1;
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kore_workers = (struct kore_worker *)accept_lock + sizeof(*accept_lock);
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memset(kore_workers, 0, sizeof(struct kore_worker) * worker_count);
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2013-06-26 16:37:22 +02:00
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2013-06-26 11:18:32 +02:00
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kore_debug("kore_worker_init(): system has %d cpu's", cpu_count);
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kore_debug("kore_worker_init(): starting %d workers", worker_count);
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if (worker_count > cpu_count)
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kore_debug("kore_worker_init(): more workers then cpu's");
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cpu = 0;
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for (i = 0; i < worker_count; i++) {
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2013-06-27 00:22:48 +02:00
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kore_worker_spawn(i, cpu++);
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2013-06-26 11:18:32 +02:00
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if (cpu == cpu_count)
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cpu = 0;
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}
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}
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void
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2013-06-27 00:22:48 +02:00
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kore_worker_spawn(u_int16_t id, u_int16_t cpu)
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2013-06-26 11:18:32 +02:00
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{
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struct kore_worker *kw;
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2013-06-27 00:22:48 +02:00
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kw = WORKER(id);
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kw->id = id;
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2013-06-26 11:18:32 +02:00
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kw->cpu = cpu;
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2013-06-27 00:22:48 +02:00
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kw->load = 0;
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2013-06-27 08:43:07 +02:00
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kw->accepted = 0;
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2013-07-07 14:48:32 +02:00
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kw->has_lock = 0;
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kw->active_hdlr = NULL;
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2013-06-27 08:43:07 +02:00
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2013-07-07 14:48:32 +02:00
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kw->pid = fork();
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2013-06-26 11:18:32 +02:00
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if (kw->pid == -1)
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fatal("could not spawn worker child: %s", errno_s);
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if (kw->pid == 0) {
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kw->pid = getpid();
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kore_worker_entry(kw);
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/* NOTREACHED */
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}
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}
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2013-06-26 16:37:22 +02:00
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void
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kore_worker_shutdown(void)
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{
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2013-06-27 00:22:48 +02:00
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struct kore_worker *kw;
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u_int16_t id, done;
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2013-06-26 16:37:22 +02:00
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kore_log(LOG_NOTICE, "waiting for workers to drain and shutdown");
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2013-06-27 00:22:48 +02:00
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for (;;) {
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done = 0;
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for (id = 0; id < worker_count; id++) {
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kw = WORKER(id);
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if (kw->pid != 0)
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kore_worker_wait(1);
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else
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done++;
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}
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if (done == worker_count)
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break;
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}
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2013-06-26 16:37:22 +02:00
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if (shmctl(shm_accept_key, IPC_RMID, NULL) == -1) {
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kore_log(LOG_NOTICE,
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"failed to deleted shm segment: %s", errno_s);
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}
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}
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void
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kore_worker_dispatch_signal(int sig)
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{
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2013-06-27 00:22:48 +02:00
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u_int16_t id;
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2013-06-26 16:37:22 +02:00
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struct kore_worker *kw;
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2013-06-27 00:22:48 +02:00
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for (id = 0; id < worker_count; id++) {
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kw = WORKER(id);
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2013-06-26 16:37:22 +02:00
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if (kill(kw->pid, sig) == -1)
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kore_debug("kill(%d, %d): %s", kw->pid, sig, errno_s);
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}
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}
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2013-06-26 11:18:32 +02:00
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void
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kore_worker_entry(struct kore_worker *kw)
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{
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int quit;
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char buf[16];
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struct connection *c, *cnext;
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2013-07-01 12:08:51 +02:00
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u_int64_t now, idle_check;
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2013-06-26 11:18:32 +02:00
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worker = kw;
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if (chroot(chroot_path) == -1)
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fatal("cannot chroot(): %s", errno_s);
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if (chdir("/") == -1)
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fatal("cannot chdir(): %s", errno_s);
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if (setgroups(1, &pw->pw_gid) || setresgid(pw->pw_gid, pw->pw_gid,
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pw->pw_gid) || setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
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fatal("unable to drop privileges");
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snprintf(buf, sizeof(buf), "kore [wrk %d]", kw->id);
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kore_platform_proctitle(buf);
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kore_platform_worker_setcpu(kw);
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kore_pid = kw->pid;
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sig_recv = 0;
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signal(SIGHUP, kore_signal);
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signal(SIGQUIT, kore_signal);
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signal(SIGPIPE, SIG_IGN);
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http_init();
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TAILQ_INIT(&disconnected);
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TAILQ_INIT(&worker_clients);
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quit = 0;
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2013-07-01 12:08:51 +02:00
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now = idle_check = 0;
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2013-06-26 11:18:32 +02:00
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kore_platform_event_init();
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kore_accesslog_worker_init();
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2013-06-27 08:43:07 +02:00
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worker->accept_treshold = worker_max_connections / 10;
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2013-06-26 11:18:32 +02:00
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kore_log(LOG_NOTICE, "worker %d started (cpu#%d)", kw->id, kw->cpu);
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2013-06-27 08:43:07 +02:00
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2013-06-26 11:18:32 +02:00
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for (;;) {
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if (sig_recv != 0) {
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if (sig_recv == SIGHUP)
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kore_module_reload();
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else if (sig_recv == SIGQUIT)
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quit = 1;
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sig_recv = 0;
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}
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2013-06-27 08:43:07 +02:00
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if (!worker->has_lock)
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2013-06-26 16:37:22 +02:00
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kore_worker_acceptlock_obtain();
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2013-06-27 08:43:07 +02:00
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kore_platform_event_wait();
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if (worker->accepted >= worker->accept_treshold &&
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worker->has_lock) {
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worker->accepted = 0;
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2013-06-26 16:37:22 +02:00
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kore_worker_acceptlock_release();
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2013-06-27 08:43:07 +02:00
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}
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2013-06-26 11:18:32 +02:00
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http_process();
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2013-07-01 12:08:51 +02:00
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now = kore_time_ms();
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if ((now - idle_check) >= 10000) {
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idle_check = now;
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TAILQ_FOREACH(c, &worker_clients, list) {
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if (c->proto == CONN_PROTO_SPDY &&
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2013-07-13 20:19:01 +02:00
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c->idle_timer.length == 0 &&
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2013-07-13 19:56:38 +02:00
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!(c->flags & CONN_WRITE_BLOCK) &&
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!(c->flags & CONN_READ_BLOCK))
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2013-07-01 12:08:51 +02:00
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continue;
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if (!(c->flags & CONN_IDLE_TIMER_ACT))
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continue;
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kore_connection_check_idletimer(now, c);
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}
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}
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2013-06-26 11:18:32 +02:00
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for (c = TAILQ_FIRST(&disconnected); c != NULL; c = cnext) {
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cnext = TAILQ_NEXT(c, list);
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TAILQ_REMOVE(&disconnected, c, list);
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kore_connection_remove(c);
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}
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if (quit && http_request_count == 0)
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break;
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}
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for (c = TAILQ_FIRST(&worker_clients); c != NULL; c = cnext) {
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cnext = TAILQ_NEXT(c, list);
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net_send_flush(c);
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TAILQ_REMOVE(&worker_clients, c, list);
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kore_connection_remove(c);
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}
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for (c = TAILQ_FIRST(&disconnected); c != NULL; c = cnext) {
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cnext = TAILQ_NEXT(c, list);
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net_send_flush(c);
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TAILQ_REMOVE(&disconnected, c, list);
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kore_connection_remove(c);
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}
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kore_debug("worker %d shutting down", kw->id);
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exit(0);
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}
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void
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kore_worker_connection_add(struct connection *c)
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{
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TAILQ_INSERT_TAIL(&worker_clients, c, list);
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2013-06-26 16:37:22 +02:00
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worker_active_connections++;
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2013-06-27 00:22:48 +02:00
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worker->load++;
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2013-06-26 11:18:32 +02:00
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}
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void
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kore_worker_connection_move(struct connection *c)
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{
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TAILQ_REMOVE(&worker_clients, c, list);
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TAILQ_INSERT_TAIL(&disconnected, c, list);
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}
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2013-06-26 16:37:22 +02:00
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void
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kore_worker_connection_remove(struct connection *c)
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{
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worker_active_connections--;
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2013-06-27 00:22:48 +02:00
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worker->load--;
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2013-06-26 16:37:22 +02:00
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}
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void
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kore_worker_wait(int final)
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{
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2013-06-27 00:22:48 +02:00
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u_int16_t id;
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2013-06-26 16:37:22 +02:00
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pid_t pid;
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2013-06-27 00:22:48 +02:00
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struct kore_worker *kw;
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2013-06-26 16:37:22 +02:00
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int status;
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if (final)
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pid = waitpid(WAIT_ANY, &status, 0);
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else
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pid = waitpid(WAIT_ANY, &status, WNOHANG);
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if (pid == -1) {
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kore_debug("waitpid(): %s", errno_s);
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return;
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}
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if (pid == 0)
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return;
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2013-06-27 00:22:48 +02:00
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for (id = 0; id < worker_count; id++) {
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kw = WORKER(id);
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2013-06-26 16:37:22 +02:00
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if (kw->pid != pid)
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continue;
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kore_log(LOG_NOTICE, "worker %d (%d)-> status %d",
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kw->id, pid, status);
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2013-06-27 00:22:48 +02:00
|
|
|
if (final) {
|
|
|
|
kw->pid = 0;
|
|
|
|
break;
|
|
|
|
}
|
2013-06-26 16:37:22 +02:00
|
|
|
|
|
|
|
if (WEXITSTATUS(status) || WTERMSIG(status) ||
|
|
|
|
WCOREDUMP(status)) {
|
|
|
|
kore_log(LOG_NOTICE,
|
2013-07-07 14:56:50 +02:00
|
|
|
"worker %d (pid: %d) (hdlr: %s) gone",
|
|
|
|
kw->id, kw->pid,
|
|
|
|
(kw->active_hdlr != NULL) ? kw->active_hdlr->func :
|
|
|
|
"none");
|
2013-07-05 20:19:50 +02:00
|
|
|
|
2013-07-07 14:48:32 +02:00
|
|
|
if (kw->pid == accept_lock->lock)
|
2013-07-05 20:19:50 +02:00
|
|
|
accept_lock->lock = accept_lock->next;
|
2013-07-07 14:48:32 +02:00
|
|
|
|
|
|
|
if (kw->active_hdlr != NULL) {
|
|
|
|
kw->active_hdlr->errors++;
|
|
|
|
kore_log(LOG_NOTICE,
|
|
|
|
"hdlr %s has caused %d error(s)",
|
|
|
|
kw->active_hdlr->func,
|
|
|
|
kw->active_hdlr->errors);
|
2013-07-05 20:19:50 +02:00
|
|
|
}
|
|
|
|
|
2013-07-07 14:48:32 +02:00
|
|
|
kore_log(LOG_NOTICE, "restarting worker %d", kw->id);
|
2013-06-27 00:22:48 +02:00
|
|
|
kore_worker_spawn(kw->id, kw->cpu);
|
2013-06-27 08:43:07 +02:00
|
|
|
} else {
|
|
|
|
kore_log(LOG_NOTICE,
|
2013-07-07 14:48:32 +02:00
|
|
|
"worker %d (pid: %d) signaled us (%d)",
|
|
|
|
kw->id, kw->pid, status);
|
2013-06-26 16:37:22 +02:00
|
|
|
}
|
2013-06-27 00:22:48 +02:00
|
|
|
|
|
|
|
break;
|
2013-06-26 16:37:22 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
kore_worker_acceptlock_obtain(void)
|
|
|
|
{
|
2013-06-27 08:43:07 +02:00
|
|
|
if (worker_count == 1 && !worker->has_lock) {
|
|
|
|
worker->has_lock = 1;
|
2013-06-26 16:37:22 +02:00
|
|
|
kore_platform_enable_accept();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2013-06-27 00:22:48 +02:00
|
|
|
if (worker_trylock()) {
|
2013-06-27 08:43:07 +02:00
|
|
|
worker->has_lock = 1;
|
2013-06-26 16:37:22 +02:00
|
|
|
kore_platform_enable_accept();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
kore_worker_acceptlock_release(void)
|
|
|
|
{
|
|
|
|
if (worker_count == 1)
|
|
|
|
return;
|
|
|
|
|
2013-06-27 08:43:07 +02:00
|
|
|
if (worker->has_lock != 1) {
|
2013-06-26 16:37:22 +02:00
|
|
|
kore_log(LOG_NOTICE,
|
|
|
|
"kore_worker_acceptlock_release() != 1");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2013-06-27 00:22:48 +02:00
|
|
|
if (worker_unlock()) {
|
2013-06-27 08:43:07 +02:00
|
|
|
worker->has_lock = 0;
|
2013-06-26 16:37:22 +02:00
|
|
|
kore_platform_disable_accept();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
2013-06-27 00:22:48 +02:00
|
|
|
worker_trylock(void)
|
2013-06-26 16:37:22 +02:00
|
|
|
{
|
2013-06-27 00:22:48 +02:00
|
|
|
if (__sync_val_compare_and_swap(&(accept_lock->lock),
|
|
|
|
worker->id, worker->pid) != worker->id)
|
|
|
|
return (0);
|
2013-06-26 16:37:22 +02:00
|
|
|
|
2013-06-27 08:43:07 +02:00
|
|
|
worker_debug("wrk#%d grabbed lock (%d/%d)\n", worker->id,
|
|
|
|
worker_active_connections, worker_max_connections);
|
2013-06-27 00:22:48 +02:00
|
|
|
worker_decide_next();
|
|
|
|
|
|
|
|
return (1);
|
2013-06-26 16:37:22 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
2013-06-27 00:22:48 +02:00
|
|
|
worker_unlock(void)
|
2013-06-26 16:37:22 +02:00
|
|
|
{
|
2013-06-27 08:43:07 +02:00
|
|
|
worker_debug("%d: wrk#%d releasing (%d/%d)\n", worker->id, worker->id,
|
|
|
|
worker_active_connections, worker_max_connections);
|
2013-06-27 00:22:48 +02:00
|
|
|
if (__sync_val_compare_and_swap(&(accept_lock->lock),
|
|
|
|
accept_lock->current, accept_lock->next) != accept_lock->current)
|
2013-06-26 16:37:22 +02:00
|
|
|
kore_log(LOG_NOTICE, "kore_internal_unlock(): wasnt locked");
|
|
|
|
|
2013-06-27 00:22:48 +02:00
|
|
|
return (1);
|
2013-06-26 16:37:22 +02:00
|
|
|
}
|
|
|
|
|
2013-06-27 00:22:48 +02:00
|
|
|
static void
|
|
|
|
worker_decide_next(void)
|
|
|
|
{
|
2013-06-27 08:43:07 +02:00
|
|
|
struct kore_worker *kw;
|
2013-06-27 00:22:48 +02:00
|
|
|
|
2013-06-27 08:43:07 +02:00
|
|
|
kw = WORKER(accept_lock->workerid++);
|
|
|
|
worker_debug("%d: next wrk#%d (%d, %p)\n",
|
|
|
|
worker->id, kw->id, kw->pid, kw);
|
|
|
|
if (accept_lock->workerid == worker_count)
|
|
|
|
accept_lock->workerid = 0;
|
2013-06-27 00:22:48 +02:00
|
|
|
|
2013-06-27 08:43:07 +02:00
|
|
|
accept_lock->next = kw->id;
|
2013-06-27 00:22:48 +02:00
|
|
|
accept_lock->current = worker->pid;
|
|
|
|
}
|