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125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/* $Id$ */
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/*
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* Copyright (c) 2013 Nicholas Marriott <nicm@users.sourceforge.net>
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* Copyright (c) 2013 Thiago de Arruda <tpadilha84@gmail.com>
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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 MIND, USE, DATA OR PROFITS, WHETHER
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* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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* OUT OF 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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#include <stdlib.h>
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#include <string.h>
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#include "tmux.h"
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/*
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* Block or wake a client on a named wait channel.
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*/
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enum cmd_retval cmd_wait_for_exec(struct cmd *, struct cmd_q *);
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const struct cmd_entry cmd_wait_for_entry = {
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"wait-for", "wait",
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"S", 1, 1,
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"[-S] channel",
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0,
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NULL,
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NULL,
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cmd_wait_for_exec
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};
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struct wait_channel {
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const char *name;
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TAILQ_HEAD(, cmd_q) waiters;
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RB_ENTRY(wait_channel) entry;
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};
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RB_HEAD(wait_channels, wait_channel);
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struct wait_channels wait_channels = RB_INITIALIZER(wait_channels);
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int wait_channel_cmp(struct wait_channel *, struct wait_channel *);
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RB_PROTOTYPE(wait_channels, wait_channel, entry, wait_channel_cmp);
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RB_GENERATE(wait_channels, wait_channel, entry, wait_channel_cmp);
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int
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wait_channel_cmp(struct wait_channel *wc1, struct wait_channel *wc2)
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{
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return (strcmp(wc1->name, wc2->name));
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}
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enum cmd_retval cmd_wait_for_signal(struct cmd_q *, const char *,
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struct wait_channel *);
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enum cmd_retval cmd_wait_for_wait(struct cmd_q *, const char *,
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struct wait_channel *);
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enum cmd_retval
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cmd_wait_for_exec(struct cmd *self, struct cmd_q *cmdq)
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{
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struct args *args = self->args;
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const char *name = args->argv[0];
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struct wait_channel *wc, wc0;
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wc0.name = name;
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wc = RB_FIND(wait_channels, &wait_channels, &wc0);
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if (args_has(args, 'S'))
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return (cmd_wait_for_signal(cmdq, name, wc));
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return (cmd_wait_for_wait(cmdq, name, wc));
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}
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enum cmd_retval
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cmd_wait_for_signal(struct cmd_q *cmdq, const char *name,
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struct wait_channel *wc)
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{
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struct cmd_q *wq, *wq1;
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if (wc == NULL || TAILQ_EMPTY(&wc->waiters)) {
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cmdq_error(cmdq, "no waiting clients on %s", name);
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return (CMD_RETURN_ERROR);
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}
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TAILQ_FOREACH_SAFE(wq, &wc->waiters, waitentry, wq1) {
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TAILQ_REMOVE(&wc->waiters, wq, waitentry);
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if (!cmdq_free(wq))
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cmdq_continue(wq);
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}
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RB_REMOVE(wait_channels, &wait_channels, wc);
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free((void*) wc->name);
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free(wc);
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return (CMD_RETURN_NORMAL);
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}
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enum cmd_retval
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cmd_wait_for_wait(struct cmd_q *cmdq, const char *name,
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struct wait_channel *wc)
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{
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if (cmdq->client == NULL || cmdq->client->session != NULL) {
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cmdq_error(cmdq, "not able to wait");
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return (CMD_RETURN_ERROR);
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}
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if (wc == NULL) {
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wc = xmalloc(sizeof *wc);
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wc->name = xstrdup(name);
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TAILQ_INIT(&wc->waiters);
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RB_INSERT(wait_channels, &wait_channels, wc);
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}
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TAILQ_INSERT_TAIL(&wc->waiters, cmdq, waitentry);
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cmdq->references++;
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return (CMD_RETURN_WAIT);
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}
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