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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/tmux/cmd-wait-for.c	Lines:	0	92	0.0 %
Date:	2017-11-13	Branches:	0	218	0.0 %


/* $OpenBSD: cmd-wait-for.c,v 1.16 2016/10/16 19:04:05 nicm Exp $ */

/*
 * Copyright (c) 2013 Nicholas Marriott <nicholas.marriott@gmail.com>
 * Copyright (c) 2013 Thiago de Arruda <tpadilha84@gmail.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
 * Block or wake a client on a named wait channel.
 */

static enum cmd_retval cmd_wait_for_exec(struct cmd *, struct cmdq_item *);

const struct cmd_entry cmd_wait_for_entry = {
	.name = "wait-for",
	.alias = "wait",

	.args = { "LSU", 1, 1 },
	.usage = "[-L|-S|-U] channel",

	.flags = 0,
	.exec = cmd_wait_for_exec
};

struct wait_item {
	struct cmdq_item	*item;
	TAILQ_ENTRY(wait_item)	 entry;
};

struct wait_channel {
	const char	       *name;
	int			locked;
	int			woken;

	TAILQ_HEAD(, wait_item)	waiters;
	TAILQ_HEAD(, wait_item)	lockers;

	RB_ENTRY(wait_channel)	entry;
};
RB_HEAD(wait_channels, wait_channel);
static struct wait_channels wait_channels = RB_INITIALIZER(wait_channels);

static int wait_channel_cmp(struct wait_channel *, struct wait_channel *);
RB_GENERATE_STATIC(wait_channels, wait_channel, entry, wait_channel_cmp);

static int
wait_channel_cmp(struct wait_channel *wc1, struct wait_channel *wc2)
{
	return (strcmp(wc1->name, wc2->name));
}

static enum cmd_retval	cmd_wait_for_signal(struct cmdq_item *, const char *,
			    struct wait_channel *);
static enum cmd_retval	cmd_wait_for_wait(struct cmdq_item *, const char *,
			    struct wait_channel *);
static enum cmd_retval	cmd_wait_for_lock(struct cmdq_item *, const char *,
			    struct wait_channel *);
static enum cmd_retval	cmd_wait_for_unlock(struct cmdq_item *, const char *,
			    struct wait_channel *);

static struct wait_channel	*cmd_wait_for_add(const char *);
static void			 cmd_wait_for_remove(struct wait_channel *);

static struct wait_channel *
cmd_wait_for_add(const char *name)
{
	struct wait_channel *wc;

	wc = xmalloc(sizeof *wc);
	wc->name = xstrdup(name);

	wc->locked = 0;
	wc->woken = 0;

	TAILQ_INIT(&wc->waiters);
	TAILQ_INIT(&wc->lockers);

	RB_INSERT(wait_channels, &wait_channels, wc);

	log_debug("add wait channel %s", wc->name);

	return (wc);
}

static void
cmd_wait_for_remove(struct wait_channel *wc)
{
	if (wc->locked)
		return;
	if (!TAILQ_EMPTY(&wc->waiters) || !wc->woken)
		return;

	log_debug("remove wait channel %s", wc->name);

	RB_REMOVE(wait_channels, &wait_channels, wc);

	free((void *)wc->name);
	free(wc);
}

static enum cmd_retval
cmd_wait_for_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args     	*args = self->args;
	const char		*name = args->argv[0];
	struct wait_channel	*wc, wc0;

	wc0.name = name;
	wc = RB_FIND(wait_channels, &wait_channels, &wc0);

	if (args_has(args, 'S'))
		return (cmd_wait_for_signal(item, name, wc));
	if (args_has(args, 'L'))
		return (cmd_wait_for_lock(item, name, wc));
	if (args_has(args, 'U'))
		return (cmd_wait_for_unlock(item, name, wc));
	return (cmd_wait_for_wait(item, name, wc));
}

static enum cmd_retval
cmd_wait_for_signal(__unused struct cmdq_item *item, const char *name,
    struct wait_channel *wc)
{
	struct wait_item	*wi, *wi1;

	if (wc == NULL)
		wc = cmd_wait_for_add(name);

	if (TAILQ_EMPTY(&wc->waiters) && !wc->woken) {
		log_debug("signal wait channel %s, no waiters", wc->name);
		wc->woken = 1;
		return (CMD_RETURN_NORMAL);
	}
	log_debug("signal wait channel %s, with waiters", wc->name);

	TAILQ_FOREACH_SAFE(wi, &wc->waiters, entry, wi1) {
		wi->item->flags &= ~CMDQ_WAITING;

		TAILQ_REMOVE(&wc->waiters, wi, entry);
		free(wi);
	}

	cmd_wait_for_remove(wc);
	return (CMD_RETURN_NORMAL);
}

static enum cmd_retval
cmd_wait_for_wait(struct cmdq_item *item, const char *name,
    struct wait_channel *wc)
{
	struct client		*c = item->client;
	struct wait_item	*wi;

	if (c == NULL || c->session != NULL) {
		cmdq_error(item, "not able to wait");
		return (CMD_RETURN_ERROR);
	}

	if (wc == NULL)
		wc = cmd_wait_for_add(name);

	if (wc->woken) {
		log_debug("wait channel %s already woken (%p)", wc->name, c);
		cmd_wait_for_remove(wc);
		return (CMD_RETURN_NORMAL);
	}
	log_debug("wait channel %s not woken (%p)", wc->name, c);

	wi = xcalloc(1, sizeof *wi);
	wi->item = item;
	TAILQ_INSERT_TAIL(&wc->waiters, wi, entry);

	return (CMD_RETURN_WAIT);
}

static enum cmd_retval
cmd_wait_for_lock(struct cmdq_item *item, const char *name,
    struct wait_channel *wc)
{
	struct wait_item	*wi;

	if (item->client == NULL || item->client->session != NULL) {
		cmdq_error(item, "not able to lock");
		return (CMD_RETURN_ERROR);
	}

	if (wc == NULL)
		wc = cmd_wait_for_add(name);

	if (wc->locked) {
		wi = xcalloc(1, sizeof *wi);
		wi->item = item;
		TAILQ_INSERT_TAIL(&wc->lockers, wi, entry);
		return (CMD_RETURN_WAIT);
	}
	wc->locked = 1;

	return (CMD_RETURN_NORMAL);
}

static enum cmd_retval
cmd_wait_for_unlock(struct cmdq_item *item, const char *name,
    struct wait_channel *wc)
{
	struct wait_item	*wi;

	if (wc == NULL || !wc->locked) {
		cmdq_error(item, "channel %s not locked", name);
		return (CMD_RETURN_ERROR);
	}

	if ((wi = TAILQ_FIRST(&wc->lockers)) != NULL) {
		wi->item->flags &= ~CMDQ_WAITING;
		TAILQ_REMOVE(&wc->lockers, wi, entry);
		free(wi);
	} else {
		wc->locked = 0;
		cmd_wait_for_remove(wc);
	}

	return (CMD_RETURN_NORMAL);
}

void
cmd_wait_for_flush(void)
{
	struct wait_channel	*wc, *wc1;
	struct wait_item	*wi, *wi1;

	RB_FOREACH_SAFE(wc, wait_channels, &wait_channels, wc1) {
		TAILQ_FOREACH_SAFE(wi, &wc->waiters, entry, wi1) {
			wi->item->flags &= ~CMDQ_WAITING;
			TAILQ_REMOVE(&wc->waiters, wi, entry);
			free(wi);
		}
		wc->woken = 1;
		TAILQ_FOREACH_SAFE(wi, &wc->lockers, entry, wi1) {
			wi->item->flags &= ~CMDQ_WAITING;
			TAILQ_REMOVE(&wc->lockers, wi, entry);
			free(wi);
		}
		wc->locked = 0;
		cmd_wait_for_remove(wc);
	}
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: cmd-wait-for.c,v 1.16 2016/10/16 19:04:05 nicm Exp $ */
2
3			/*
4			* Copyright (c) 2013 Nicholas Marriott <nicholas.marriott@gmail.com>
5			* Copyright (c) 2013 Thiago de Arruda <tpadilha84@gmail.com>
6			*
7			* Permission to use, copy, modify, and distribute this software for any
8			* purpose with or without fee is hereby granted, provided that the above
9			* copyright notice and this permission notice appear in all copies.
10			*
11			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15			* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
16			* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
17			* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18			*/
19
20			#include <sys/types.h>
21
22			#include <stdlib.h>
23			#include <string.h>
24
25			#include "tmux.h"
26
27			/*
28			* Block or wake a client on a named wait channel.
29			*/
30
31			static enum cmd_retval cmd_wait_for_exec(struct cmd , struct cmdq_item );
32
33			const struct cmd_entry cmd_wait_for_entry = {
34			.name = "wait-for",
35			.alias = "wait",
36
37			.args = { "LSU", 1, 1 },
38			.usage = "[-L\|-S\|-U] channel",
39
40			.flags = 0,
41			.exec = cmd_wait_for_exec
42			};
43
44			struct wait_item {
45			struct cmdq_item *item;
46			TAILQ_ENTRY(wait_item) entry;
47			};
48
49			struct wait_channel {
50			const char *name;
51			int locked;
52			int woken;
53
54			TAILQ_HEAD(, wait_item) waiters;
55			TAILQ_HEAD(, wait_item) lockers;
56
57			RB_ENTRY(wait_channel) entry;
58			};
59			RB_HEAD(wait_channels, wait_channel);
60			static struct wait_channels wait_channels = RB_INITIALIZER(wait_channels);
61
62			static int wait_channel_cmp(struct wait_channel , struct wait_channel );
63			RB_GENERATE_STATIC(wait_channels, wait_channel, entry, wait_channel_cmp);
64
65			static int
66			wait_channel_cmp(struct wait_channel wc1, struct wait_channel wc2)
67			{
68			return (strcmp(wc1->name, wc2->name));
69			}
70
71			static enum cmd_retval cmd_wait_for_signal(struct cmdq_item , const char ,
72			struct wait_channel *);
73			static enum cmd_retval cmd_wait_for_wait(struct cmdq_item , const char ,
74			struct wait_channel *);
75			static enum cmd_retval cmd_wait_for_lock(struct cmdq_item , const char ,
76			struct wait_channel *);
77			static enum cmd_retval cmd_wait_for_unlock(struct cmdq_item , const char ,
78			struct wait_channel *);
79
80			static struct wait_channel cmd_wait_for_add(const char );
81			static void cmd_wait_for_remove(struct wait_channel *);
82
83			static struct wait_channel *
84			cmd_wait_for_add(const char *name)
85			{
86			struct wait_channel *wc;
87
88			wc = xmalloc(sizeof *wc);
89			wc->name = xstrdup(name);
90
91			wc->locked = 0;
92			wc->woken = 0;
93
94			TAILQ_INIT(&wc->waiters);
95			TAILQ_INIT(&wc->lockers);
96
97			RB_INSERT(wait_channels, &wait_channels, wc);
98
99			log_debug("add wait channel %s", wc->name);
100
101			return (wc);
102			}
103
104			static void
105			cmd_wait_for_remove(struct wait_channel *wc)
106			{
107			if (wc->locked)
108			return;
109			if (!TAILQ_EMPTY(&wc->waiters) \|\| !wc->woken)
110			return;
111
112			log_debug("remove wait channel %s", wc->name);
113
114			RB_REMOVE(wait_channels, &wait_channels, wc);
115
116			free((void *)wc->name);
117			free(wc);
118			}
119
120			static enum cmd_retval
121			cmd_wait_for_exec(struct cmd self, struct cmdq_item item)
122			{
123			struct args *args = self->args;
124			const char *name = args->argv[0];
125			struct wait_channel *wc, wc0;
126
127			wc0.name = name;
128			wc = RB_FIND(wait_channels, &wait_channels, &wc0);
129
130			if (args_has(args, 'S'))
131			return (cmd_wait_for_signal(item, name, wc));
132			if (args_has(args, 'L'))
133			return (cmd_wait_for_lock(item, name, wc));
134			if (args_has(args, 'U'))
135			return (cmd_wait_for_unlock(item, name, wc));
136			return (cmd_wait_for_wait(item, name, wc));
137			}
138
139			static enum cmd_retval
140			cmd_wait_for_signal(__unused struct cmdq_item item, const char name,
141			struct wait_channel *wc)
142			{
143			struct wait_item wi, wi1;
144
145			if (wc == NULL)
146			wc = cmd_wait_for_add(name);
147
148			if (TAILQ_EMPTY(&wc->waiters) && !wc->woken) {
149			log_debug("signal wait channel %s, no waiters", wc->name);
150			wc->woken = 1;
151			return (CMD_RETURN_NORMAL);
152			}
153			log_debug("signal wait channel %s, with waiters", wc->name);
154
155			TAILQ_FOREACH_SAFE(wi, &wc->waiters, entry, wi1) {
156			wi->item->flags &= ~CMDQ_WAITING;
157
158			TAILQ_REMOVE(&wc->waiters, wi, entry);
159			free(wi);
160			}
161
162			cmd_wait_for_remove(wc);
163			return (CMD_RETURN_NORMAL);
164			}
165
166			static enum cmd_retval
167			cmd_wait_for_wait(struct cmdq_item item, const char name,
168			struct wait_channel *wc)
169			{
170			struct client *c = item->client;
171			struct wait_item *wi;
172
173			if (c == NULL \|\| c->session != NULL) {
174			cmdq_error(item, "not able to wait");
175			return (CMD_RETURN_ERROR);
176			}
177
178			if (wc == NULL)
179			wc = cmd_wait_for_add(name);
180
181			if (wc->woken) {
182			log_debug("wait channel %s already woken (%p)", wc->name, c);
183			cmd_wait_for_remove(wc);
184			return (CMD_RETURN_NORMAL);
185			}
186			log_debug("wait channel %s not woken (%p)", wc->name, c);
187
188			wi = xcalloc(1, sizeof *wi);
189			wi->item = item;
190			TAILQ_INSERT_TAIL(&wc->waiters, wi, entry);
191
192			return (CMD_RETURN_WAIT);
193			}
194
195			static enum cmd_retval
196			cmd_wait_for_lock(struct cmdq_item item, const char name,
197			struct wait_channel *wc)
198			{
199			struct wait_item *wi;
200
201			if (item->client == NULL \|\| item->client->session != NULL) {
202			cmdq_error(item, "not able to lock");
203			return (CMD_RETURN_ERROR);
204			}
205
206			if (wc == NULL)
207			wc = cmd_wait_for_add(name);
208
209			if (wc->locked) {
210			wi = xcalloc(1, sizeof *wi);
211			wi->item = item;
212			TAILQ_INSERT_TAIL(&wc->lockers, wi, entry);
213			return (CMD_RETURN_WAIT);
214			}
215			wc->locked = 1;
216
217			return (CMD_RETURN_NORMAL);
218			}
219
220			static enum cmd_retval
221			cmd_wait_for_unlock(struct cmdq_item item, const char name,
222			struct wait_channel *wc)
223			{
224			struct wait_item *wi;
225
226			if (wc == NULL \|\| !wc->locked) {
227			cmdq_error(item, "channel %s not locked", name);
228			return (CMD_RETURN_ERROR);
229			}
230
231			if ((wi = TAILQ_FIRST(&wc->lockers)) != NULL) {
232			wi->item->flags &= ~CMDQ_WAITING;
233			TAILQ_REMOVE(&wc->lockers, wi, entry);
234			free(wi);
235			} else {
236			wc->locked = 0;
237			cmd_wait_for_remove(wc);
238			}
239
240			return (CMD_RETURN_NORMAL);
241			}
242
243			void
244			cmd_wait_for_flush(void)
245			{
246			struct wait_channel wc, wc1;
247			struct wait_item wi, wi1;
248
249			RB_FOREACH_SAFE(wc, wait_channels, &wait_channels, wc1) {
250			TAILQ_FOREACH_SAFE(wi, &wc->waiters, entry, wi1) {
251			wi->item->flags &= ~CMDQ_WAITING;
252			TAILQ_REMOVE(&wc->waiters, wi, entry);
253			free(wi);
254			}
255			wc->woken = 1;
256			TAILQ_FOREACH_SAFE(wi, &wc->lockers, entry, wi1) {
257			wi->item->flags &= ~CMDQ_WAITING;
258			TAILQ_REMOVE(&wc->lockers, wi, entry);
259			free(wi);
260			}
261			wc->locked = 0;
262			cmd_wait_for_remove(wc);
263			}
264			}