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Sat, 17 Oct 2020 03:16:38 -0700 (PDT) Received: from localhost.localdomain ([170.253.60.68]) by smtp.googlemail.com with ESMTPSA id e11sm2029429wrj.75.2020.10.17.03.16.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 17 Oct 2020 03:16:37 -0700 (PDT) To: mtk.manpages@gmail.com Subject: [PATCH] queue.3: stailq: Complete example Date: Sat, 17 Oct 2020 12:16:17 +0200 Message-Id: <20201017101616.27633-1-colomar.6.4.3@gmail.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 X-Spam-Status: No, score=-10.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Alejandro Colomar via Libc-alpha From: Alejandro Colomar Reply-To: Alejandro Colomar Cc: Alejandro Colomar , linux-man@vger.kernel.org, libc-alpha@sourceware.org Errors-To: libc-alpha-bounces@sourceware.org Sender: "Libc-alpha" Signed-off-by: Alejandro Colomar --- man3/queue.3 | 117 ++++++++++++++++++++++++++++----------------------- 1 file changed, 64 insertions(+), 53 deletions(-) diff --git a/man3/queue.3 b/man3/queue.3 index 9cd6ff378..c48b4ba9f 100644 --- a/man3/queue.3 +++ b/man3/queue.3 @@ -721,59 +721,9 @@ from the tail queue. .\" .Fa head1 .\" and .\" .Fa head2 . -.Ss Singly-linked tail queue example -.Bd -literal -STAILQ_HEAD(stailhead, entry) head = - STAILQ_HEAD_INITIALIZER(head); -struct stailhead *headp; /* Singly-linked tail queue head. */ -struct entry { - ... - STAILQ_ENTRY(entry) entries; /* Tail queue. */ - ... -} *n1, *n2, *n3, *np; - -STAILQ_INIT(&head); /* Initialize the queue. */ - -n1 = malloc(sizeof(struct entry)); /* Insert at the head. */ -STAILQ_INSERT_HEAD(&head, n1, entries); - -n1 = malloc(sizeof(struct entry)); /* Insert at the tail. */ -STAILQ_INSERT_TAIL(&head, n1, entries); - -n2 = malloc(sizeof(struct entry)); /* Insert after. */ -STAILQ_INSERT_AFTER(&head, n1, n2, entries); - /* Deletion. */ -STAILQ_REMOVE(&head, n2, entry, entries); -free(n2); - /* Deletion from the head. */ -n3 = STAILQ_FIRST(&head); -STAILQ_REMOVE_HEAD(&head, entries); -free(n3); - /* Forward traversal. */ -STAILQ_FOREACH(np, &head, entries) - np\-> ... -.\" /* Safe forward traversal. */ -.\"STAILQ_FOREACH_SAFE(np, &head, entries, np_temp) { -.\" np\->do_stuff(); -.\" ... -.\" STAILQ_REMOVE(&head, np, entry, entries); -.\" free(np); -.\"} - /* TailQ Deletion. */ -while (!STAILQ_EMPTY(&head)) { - n1 = STAILQ_FIRST(&head); - STAILQ_REMOVE_HEAD(&head, entries); - free(n1); -} - /* Faster TailQ Deletion. */ -n1 = STAILQ_FIRST(&head); -while (n1 != NULL) { - n2 = STAILQ_NEXT(n1, entries); - free(n1); - n1 = n2; -} -STAILQ_INIT(&head); -.Ed +.Pp +See the EXAMPLES section below for an example program +using a singly-linked tail queue. .Ss Lists A list is headed by a structure defined by the .Nm LIST_HEAD @@ -1328,6 +1278,67 @@ main(void) exit(EXIT_SUCCESS); } .Ed +.Ss Singly-linked tail queue example +.Bd -literal +#include +#include +#include +#include + +struct entry { + int data; + STAILQ_ENTRY(entry) entries; /* Singly-linked tail queue. */ +}; + +STAILQ_HEAD(stailhead, entry); + +int +main(void) +{ + struct entry *n1, *n2, *n3, *np; + struct stailhead head; /* Singly-linked tail queue + head. */ + + STAILQ_INIT(&head); /* Initialize the queue. */ + + n1 = malloc(sizeof(struct entry)); /* Insert at the head. */ + STAILQ_INSERT_HEAD(&head, n1, entries); + + n1 = malloc(sizeof(struct entry)); /* Insert at the tail. */ + STAILQ_INSERT_TAIL(&head, n1, entries); + + n2 = malloc(sizeof(struct entry)); /* Insert after. */ + STAILQ_INSERT_AFTER(&head, n1, n2, entries); + + STAILQ_REMOVE(&head, n2, entry, entries);/* Deletion. */ + free(n2); + + n3 = STAILQ_FIRST(&head); + STAILQ_REMOVE_HEAD(&head, entries); /* Deletion from the head. */ + free(n3); + + n1 = STAILQ_FIRST(&head); + n1->data = 0; + for (int i = 1; i < 5; i++) { + n1 = malloc(sizeof(struct entry)); + STAILQ_INSERT_HEAD(&head, n1, entries); + n1->data = i; + } + /* Forward traversal. */ + STAILQ_FOREACH(np, &head, entries) + printf("%i\en", np->data); + /* TailQ Deletion. */ + n1 = STAILQ_FIRST(&head); + while (n1 != NULL) { + n2 = STAILQ_NEXT(n1, entries); + free(n1); + n1 = n2; + } + STAILQ_INIT(&head); + + exit(EXIT_SUCCESS); +} +.Ed .Ss List example .Bd -literal #include