648 lines
17 KiB
C
648 lines
17 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) NGINX, Inc.
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*/
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#include <nxt_main.h>
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/*
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* pollset has been introduced in AIX 5L 5.3.
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*
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* pollset_create() returns a pollset_t descriptor which is not
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* a file descriptor, so it cannot be added to another pollset.
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* The first pollset_create() call returns 0.
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*/
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#define NXT_POLLSET_ADD 0
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#define NXT_POLLSET_UPDATE 1
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#define NXT_POLLSET_CHANGE 2
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#define NXT_POLLSET_DELETE 3
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static nxt_int_t nxt_pollset_create(nxt_event_engine_t *engine,
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nxt_uint_t mchanges, nxt_uint_t mevents);
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static void nxt_pollset_free(nxt_event_engine_t *engine);
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static void nxt_pollset_enable(nxt_event_engine_t *engine, nxt_fd_event_t *ev);
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static void nxt_pollset_disable(nxt_event_engine_t *engine, nxt_fd_event_t *ev);
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static nxt_bool_t nxt_pollset_close(nxt_event_engine_t *engine,
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nxt_fd_event_t *ev);
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static void nxt_pollset_enable_read(nxt_event_engine_t *engine,
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nxt_fd_event_t *ev);
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static void nxt_pollset_enable_write(nxt_event_engine_t *engine,
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nxt_fd_event_t *ev);
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static void nxt_pollset_disable_read(nxt_event_engine_t *engine,
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nxt_fd_event_t *ev);
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static void nxt_pollset_disable_write(nxt_event_engine_t *engine,
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nxt_fd_event_t *ev);
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static void nxt_pollset_block_read(nxt_event_engine_t *engine,
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nxt_fd_event_t *ev);
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static void nxt_pollset_block_write(nxt_event_engine_t *engine,
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nxt_fd_event_t *ev);
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static void nxt_pollset_oneshot_read(nxt_event_engine_t *engine,
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nxt_fd_event_t *ev);
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static void nxt_pollset_oneshot_write(nxt_event_engine_t *engine,
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nxt_fd_event_t *ev);
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static void nxt_pollset_change(nxt_event_engine_t *engine, nxt_fd_event_t *ev,
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nxt_uint_t op, nxt_uint_t events);
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static nxt_int_t nxt_pollset_commit_changes(nxt_event_engine_t *engine);
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static void nxt_pollset_change_error(nxt_event_engine_t *engine,
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nxt_fd_event_t *ev);
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static void nxt_pollset_remove(nxt_event_engine_t *engine, nxt_fd_t fd);
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static nxt_int_t nxt_pollset_write(nxt_event_engine_t *engine,
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struct poll_ctl *ctl, int n);
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static void nxt_pollset_poll(nxt_event_engine_t *engine, nxt_msec_t timeout);
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const nxt_event_interface_t nxt_pollset_engine = {
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"pollset",
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nxt_pollset_create,
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nxt_pollset_free,
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nxt_pollset_enable,
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nxt_pollset_disable,
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nxt_pollset_disable,
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nxt_pollset_close,
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nxt_pollset_enable_read,
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nxt_pollset_enable_write,
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nxt_pollset_disable_read,
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nxt_pollset_disable_write,
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nxt_pollset_block_read,
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nxt_pollset_block_write,
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nxt_pollset_oneshot_read,
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nxt_pollset_oneshot_write,
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nxt_pollset_enable_read,
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NULL,
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NULL,
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NULL,
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NULL,
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nxt_pollset_poll,
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&nxt_unix_conn_io,
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NXT_NO_FILE_EVENTS,
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NXT_NO_SIGNAL_EVENTS,
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};
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static nxt_int_t
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nxt_pollset_create(nxt_event_engine_t *engine, nxt_uint_t mchanges,
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nxt_uint_t mevents)
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{
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void *changes;
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engine->u.pollset.ps = -1;
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engine->u.pollset.mchanges = mchanges;
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engine->u.pollset.mevents = mevents;
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changes = nxt_malloc(sizeof(nxt_pollset_change_t) * mchanges);
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if (changes == NULL) {
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goto fail;
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}
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engine->u.pollset.changes = changes;
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/*
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* NXT_POLLSET_CHANGE requires two struct poll_ctl's
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* for PS_DELETE and subsequent PS_ADD.
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*/
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changes = nxt_malloc(2 * sizeof(struct poll_ctl) * mchanges);
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if (changes == NULL) {
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goto fail;
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}
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engine->u.pollset.write_changes = changes;
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engine->u.pollset.events = nxt_malloc(sizeof(struct pollfd) * mevents);
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if (engine->u.pollset.events == NULL) {
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goto fail;
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}
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engine->u.pollset.ps = pollset_create(-1);
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if (engine->u.pollset.ps == -1) {
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nxt_log(&engine->task, NXT_LOG_CRIT, "pollset_create() failed %E",
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nxt_errno);
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goto fail;
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}
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nxt_debug(&engine->task, "pollset_create(): %d", engine->u.pollset.ps);
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return NXT_OK;
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fail:
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nxt_pollset_free(engine);
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return NXT_ERROR;
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}
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static void
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nxt_pollset_free(nxt_event_engine_t *engine)
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{
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pollset_t ps;
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ps = engine->u.pollset.ps;
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nxt_debug(&engine->task, "pollset %d free", ps);
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if (ps != -1 && pollset_destroy(ps) != 0) {
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nxt_log(&engine->task, NXT_LOG_CRIT, "pollset_destroy(%d) failed %E",
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ps, nxt_errno);
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}
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nxt_free(engine->u.pollset.events);
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nxt_free(engine->u.pollset.write_changes);
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nxt_free(engine->u.pollset.changes);
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nxt_fd_event_hash_destroy(&engine->u.pollset.fd_hash);
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nxt_memzero(&engine->u.pollset, sizeof(nxt_pollset_engine_t));
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}
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static void
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nxt_pollset_enable(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
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{
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ev->read = NXT_EVENT_ACTIVE;
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ev->write = NXT_EVENT_ACTIVE;
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nxt_pollset_change(engine, ev, NXT_POLLSET_ADD, POLLIN | POLLOUT);
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}
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static void
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nxt_pollset_disable(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
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{
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if (ev->read != NXT_EVENT_INACTIVE || ev->write != NXT_EVENT_INACTIVE) {
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ev->read = NXT_EVENT_INACTIVE;
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ev->write = NXT_EVENT_INACTIVE;
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nxt_pollset_change(engine, ev, NXT_POLLSET_DELETE, 0);
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}
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}
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/*
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* A closed descriptor must be deleted from a pollset, otherwise next
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* pollset_poll() will return POLLNVAL on it. However, pollset_ctl()
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* allows to delete the already closed file descriptor from the pollset
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* using PS_DELETE, so the removal can be batched, pollset_ctl(2):
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*
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* After a file descriptor is added to a pollset, the file descriptor will
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* not be removed until a pollset_ctl call with the cmd of PS_DELETE is
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* executed. The file descriptor remains in the pollset even if the file
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* descriptor is closed. A pollset_poll operation on a pollset containing
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* a closed file descriptor returns a POLLNVAL event for that file
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* descriptor. If the file descriptor is later allocated to a new object,
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* the new object will be polled on future pollset_poll calls.
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*/
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static nxt_bool_t
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nxt_pollset_close(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
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{
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nxt_pollset_disable(engine, ev);
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return ev->changing;
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}
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static void
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nxt_pollset_enable_read(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
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{
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nxt_uint_t op, events;
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if (ev->read != NXT_EVENT_BLOCKED) {
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events = POLLIN;
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if (ev->write == NXT_EVENT_INACTIVE) {
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op = NXT_POLLSET_ADD;
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} else if (ev->write == NXT_EVENT_BLOCKED) {
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ev->write = NXT_EVENT_INACTIVE;
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op = NXT_POLLSET_CHANGE;
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} else {
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op = NXT_POLLSET_UPDATE;
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events = POLLIN | POLLOUT;
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}
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nxt_pollset_change(engine, ev, op, events);
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}
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ev->read = NXT_EVENT_ACTIVE;
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}
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static void
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nxt_pollset_enable_write(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
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{
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nxt_uint_t op, events;
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if (ev->write != NXT_EVENT_BLOCKED) {
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events = POLLOUT;
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if (ev->read == NXT_EVENT_INACTIVE) {
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op = NXT_POLLSET_ADD;
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} else if (ev->read == NXT_EVENT_BLOCKED) {
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ev->read = NXT_EVENT_INACTIVE;
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op = NXT_POLLSET_CHANGE;
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} else {
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op = NXT_POLLSET_UPDATE;
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events = POLLIN | POLLOUT;
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}
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nxt_pollset_change(engine, ev, op, events);
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}
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ev->write = NXT_EVENT_ACTIVE;
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}
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static void
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nxt_pollset_disable_read(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
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{
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nxt_uint_t op, events;
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ev->read = NXT_EVENT_INACTIVE;
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if (ev->write <= NXT_EVENT_BLOCKED) {
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ev->write = NXT_EVENT_INACTIVE;
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op = NXT_POLLSET_DELETE;
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events = POLLREMOVE;
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} else {
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op = NXT_POLLSET_CHANGE;
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events = POLLOUT;
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}
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nxt_pollset_change(engine, ev, op, events);
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}
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static void
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nxt_pollset_disable_write(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
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{
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nxt_uint_t op, events;
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ev->write = NXT_EVENT_INACTIVE;
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if (ev->read <= NXT_EVENT_BLOCKED) {
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ev->read = NXT_EVENT_INACTIVE;
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op = NXT_POLLSET_DELETE;
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events = POLLREMOVE;
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} else {
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op = NXT_POLLSET_CHANGE;
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events = POLLIN;
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}
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nxt_pollset_change(engine, ev, op, events);
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}
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static void
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nxt_pollset_block_read(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
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{
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if (ev->read != NXT_EVENT_INACTIVE) {
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ev->read = NXT_EVENT_BLOCKED;
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}
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}
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static void
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nxt_pollset_block_write(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
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{
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if (ev->write != NXT_EVENT_INACTIVE) {
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ev->write = NXT_EVENT_BLOCKED;
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}
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}
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static void
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nxt_pollset_oneshot_read(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
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{
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nxt_pollset_enable_read(engine, ev);
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ev->read = NXT_EVENT_ONESHOT;
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}
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static void
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nxt_pollset_oneshot_write(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
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{
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nxt_pollset_enable_write(engine, ev);
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ev->write = NXT_EVENT_ONESHOT;
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}
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/*
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* PS_ADD adds only a new file descriptor to a pollset.
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* PS_DELETE removes a file descriptor from a pollset.
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*
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* PS_MOD can add a new file descriptor or modify events for a file
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* descriptor which is already in a pollset. However, modified events
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* are always ORed, so to delete an event for a file descriptor,
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* the file descriptor must be removed using PS_DELETE and then
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* added again without the event.
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*/
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static void
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nxt_pollset_change(nxt_event_engine_t *engine, nxt_fd_event_t *ev,
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nxt_uint_t op, nxt_uint_t events)
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{
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nxt_pollset_change_t *change;
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nxt_debug(ev->task, "pollset %d change fd:%d op:%ui ev:%04Xi",
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engine->u.pollset.ps, ev->fd, op, events);
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if (engine->u.pollset.nchanges >= engine->u.pollset.mchanges) {
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(void) nxt_pollset_commit_changes(engine);
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}
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ev->changing = 1;
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change = &engine->u.pollset.changes[engine->u.pollset.nchanges++];
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change->op = op;
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change->cmd = (op == NXT_POLLSET_DELETE) ? PS_DELETE : PS_MOD;
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change->events = events;
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change->event = ev;
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}
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static nxt_int_t
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nxt_pollset_commit_changes(nxt_event_engine_t *engine)
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{
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size_t n;
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nxt_int_t ret, retval;
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nxt_fd_event_t *ev;
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struct poll_ctl *ctl, *write_changes;
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nxt_pollset_change_t *change, *end;
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nxt_debug(&engine->task, "pollset %d changes:%ui",
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engine->u.pollset.ps, engine->u.pollset.nchanges);
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retval = NXT_OK;
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n = 0;
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write_changes = engine->u.pollset.write_changes;
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change = engine->u.pollset.changes;
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end = change + engine->u.pollset.nchanges;
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do {
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ev = change->event;
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ev->changing = 0;
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nxt_debug(&engine->task, "pollset fd:%d op:%d ev:%04Xd",
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ev->fd, change->op, change->events);
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if (change->op == NXT_POLLSET_CHANGE) {
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ctl = &write_changes[n++];
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ctl->cmd = PS_DELETE;
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ctl->events = 0;
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ctl->fd = ev->fd;
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}
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ctl = &write_changes[n++];
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ctl->cmd = change->cmd;
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ctl->events = change->events;
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ctl->fd = ev->fd;
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change++;
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} while (change < end);
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change = engine->u.pollset.changes;
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end = change + engine->u.pollset.nchanges;
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ret = nxt_pollset_write(engine, write_changes, n);
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if (nxt_slow_path(ret != NXT_OK)) {
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do {
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nxt_pollset_change_error(engine, change->event);
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change++;
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} while (change < end);
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engine->u.pollset.nchanges = 0;
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return NXT_ERROR;
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}
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do {
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ev = change->event;
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if (change->op == NXT_POLLSET_ADD) {
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ret = nxt_fd_event_hash_add(&engine->u.pollset.fd_hash, ev->fd, ev);
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if (nxt_slow_path(ret != NXT_OK)) {
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nxt_pollset_change_error(engine, ev);
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retval = NXT_ERROR;
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}
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} else if (change->op == NXT_POLLSET_DELETE) {
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nxt_fd_event_hash_delete(&engine->task, &engine->u.pollset.fd_hash,
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ev->fd, 0);
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}
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/* Nothing to do for NXT_POLLSET_UPDATE and NXT_POLLSET_CHANGE. */
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change++;
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} while (change < end);
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engine->u.pollset.nchanges = 0;
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return retval;
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}
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static void
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nxt_pollset_change_error(nxt_event_engine_t *engine, nxt_fd_event_t *ev)
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{
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ev->read = NXT_EVENT_INACTIVE;
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ev->write = NXT_EVENT_INACTIVE;
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nxt_work_queue_add(&engine->fast_work_queue, ev->error_handler,
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ev->task, ev, ev->data);
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nxt_fd_event_hash_delete(&engine->task, &engine->u.pollset.fd_hash,
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ev->fd, 1);
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nxt_pollset_remove(engine, ev->fd);
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}
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static void
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nxt_pollset_remove(nxt_event_engine_t *engine, nxt_fd_t fd)
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{
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int n;
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struct pollfd pfd;
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struct poll_ctl ctl;
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pfd.fd = fd;
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pfd.events = 0;
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pfd.revents = 0;
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n = pollset_query(engine->u.pollset.ps, &pfd);
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nxt_debug(&engine->task, "pollset_query(%d, %d): %d",
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engine->u.pollset.ps, fd, n);
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if (n == 0) {
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/* The file descriptor is not in the pollset. */
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return;
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}
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if (n == -1) {
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nxt_log(&engine->task, NXT_LOG_CRIT, "pollset_query(%d, %d) failed %E",
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engine->u.pollset.ps, fd, nxt_errno);
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/* Fall through. */
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}
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/* n == 1: The file descriptor is in the pollset. */
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nxt_debug(&engine->task, "pollset %d remove fd:%d",
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engine->u.pollset.ps, fd);
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ctl.cmd = PS_DELETE;
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ctl.events = 0;
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ctl.fd = fd;
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nxt_pollset_write(engine, &ctl, 1);
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|
}
|
|
|
|
|
|
static nxt_int_t
|
|
nxt_pollset_write(nxt_event_engine_t *engine, struct poll_ctl *ctl, int n)
|
|
{
|
|
pollset_t ps;
|
|
|
|
ps = engine->u.pollset.ps;
|
|
|
|
nxt_debug(&engine->task, "pollset_ctl(%d) changes:%d", ps, n);
|
|
|
|
nxt_set_errno(0);
|
|
|
|
n = pollset_ctl(ps, ctl, n);
|
|
|
|
if (nxt_fast_path(n == 0)) {
|
|
return NXT_OK;
|
|
}
|
|
|
|
nxt_log(&engine->task, NXT_LOG_CRIT, "pollset_ctl(%d) failed: %d %E",
|
|
ps, n, nxt_errno);
|
|
|
|
return NXT_ERROR;
|
|
}
|
|
|
|
|
|
static void
|
|
nxt_pollset_poll(nxt_event_engine_t *engine, nxt_msec_t timeout)
|
|
{
|
|
int nevents;
|
|
nxt_fd_t fd;
|
|
nxt_int_t i;
|
|
nxt_err_t err;
|
|
nxt_uint_t events, level;
|
|
struct pollfd *pfd;
|
|
nxt_fd_event_t *ev;
|
|
|
|
if (engine->u.pollset.nchanges != 0) {
|
|
if (nxt_pollset_commit_changes(engine) != NXT_OK) {
|
|
/* Error handlers have been enqueued on failure. */
|
|
timeout = 0;
|
|
}
|
|
}
|
|
|
|
nxt_debug(&engine->task, "pollset_poll(%d) timeout:%M",
|
|
engine->u.pollset.ps, timeout);
|
|
|
|
nevents = pollset_poll(engine->u.pollset.ps, engine->u.pollset.events,
|
|
engine->u.pollset.mevents, timeout);
|
|
|
|
err = (nevents == -1) ? nxt_errno : 0;
|
|
|
|
nxt_thread_time_update(engine->task.thread);
|
|
|
|
nxt_debug(&engine->task, "pollset_poll(%d): %d",
|
|
engine->u.pollset.ps, nevents);
|
|
|
|
if (nevents == -1) {
|
|
level = (err == NXT_EINTR) ? NXT_LOG_INFO : NXT_LOG_CRIT;
|
|
|
|
nxt_log(&engine->task, level, "pollset_poll(%d) failed %E",
|
|
engine->u.pollset.ps, err);
|
|
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < nevents; i++) {
|
|
|
|
pfd = &engine->u.pollset.events[i];
|
|
fd = pfd->fd;
|
|
events = pfd->revents;
|
|
|
|
ev = nxt_fd_event_hash_get(&engine->task, &engine->u.pollset.fd_hash,
|
|
fd);
|
|
|
|
if (nxt_slow_path(ev == NULL)) {
|
|
nxt_log(&engine->task, NXT_LOG_CRIT,
|
|
"pollset_poll(%d) returned invalid "
|
|
"fd:%d ev:%04Xd rev:%04uXi",
|
|
engine->u.pollset.ps, fd, pfd->events, events);
|
|
|
|
nxt_pollset_remove(engine, fd);
|
|
continue;
|
|
}
|
|
|
|
nxt_debug(ev->task, "pollset: fd:%d ev:%04uXi", fd, events);
|
|
|
|
if (nxt_slow_path(events & (POLLERR | POLLHUP | POLLNVAL)) != 0) {
|
|
nxt_log(ev->task, NXT_LOG_CRIT,
|
|
"pollset_poll(%d) error fd:%d ev:%04Xd rev:%04uXi",
|
|
engine->u.pollset.ps, fd, pfd->events, events);
|
|
|
|
nxt_work_queue_add(&engine->fast_work_queue, ev->error_handler,
|
|
ev->task, ev, ev->data);
|
|
continue;
|
|
}
|
|
|
|
if (events & POLLIN) {
|
|
ev->read_ready = 1;
|
|
|
|
if (ev->read != NXT_EVENT_BLOCKED) {
|
|
nxt_work_queue_add(ev->read_work_queue, ev->read_handler,
|
|
ev->task, ev, ev->data);
|
|
}
|
|
|
|
if (ev->read == NXT_EVENT_BLOCKED
|
|
|| ev->read == NXT_EVENT_ONESHOT)
|
|
{
|
|
nxt_pollset_disable_read(engine, ev);
|
|
}
|
|
}
|
|
|
|
if (events & POLLOUT) {
|
|
ev->write_ready = 1;
|
|
|
|
if (ev->write != NXT_EVENT_BLOCKED) {
|
|
nxt_work_queue_add(ev->write_work_queue, ev->write_handler,
|
|
ev->task, ev, ev->data);
|
|
}
|
|
|
|
if (ev->write == NXT_EVENT_BLOCKED
|
|
|| ev->write == NXT_EVENT_ONESHOT)
|
|
{
|
|
nxt_pollset_disable_write(engine, ev);
|
|
}
|
|
}
|
|
}
|
|
}
|