\n| \n \u5178\u578b\u573a\u666f<\/p>\n<\/td>\n | \n \u9ad8\u9891\u5927\u6570\u636e\u4ea4\u6362<\/p>\n<\/td>\n | \n \u547d\u4ee4\/\u4e8b\u4ef6\u901a\u77e5\u3001\u4f4e\u9891\u5c0f\u6570\u636e<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u5176\u7ba1\u7406\u65b9\u5f0f\u4e5f\u88ab\u89c6\u4e3a\u6587\u4ef6\u3002<\/p>\n 1.2 mq_writer.c<\/h3>\n\/\/ mq_writer.c – \u6d88\u606f\u961f\u5217\u5199\u8fdb\u7a0b（\u53d1\u9001\u8005）
\n\/\/ \u7f16\u8bd1：gcc mq_writer.c -o mq_writer -lrt
\n\/\/ \u8fd0\u884c：.\/mq_writer<\/p>\n #include <stdio.h>
\n#include <stdlib.h>
\n#include <string.h>
\n#include <fcntl.h>
\n#include <sys\/stat.h>
\n#include <mqueue.h>
\n#include <unistd.h>
\n#include <errno.h><\/p>\n \/\/ ============ \u914d\u7f6e\u53c2\u6570 ============
\n#define MQ_NAME "\/my_message_queue" \/\/ \u5fc5\u987b\u4ee5\/\u5f00\u5934
\n#define MQ_PERM 0664 \/\/ \u6743\u9650：rw-rw-r–
\n#define MAX_MSG 10 \/\/ \u961f\u5217\u6700\u5927\u6d88\u606f\u6570
\n#define MAX_MSG_SIZE 256 \/\/ \u5355\u6761\u6d88\u606f\u6700\u5927\u5b57\u8282\u6570
\n\/\/ ==================================<\/p>\n typedef struct {
\n int type; \/\/ \u6d88\u606f\u7c7b\u578b（POSIX\u6807\u51c6\u4e2d\u5b9e\u9645\u672a\u4f7f\u7528，\u4f46\u53ef\u81ea\u5b9a\u4e49）
\n char data[256]; \/\/ \u6d88\u606f\u8d1f\u8f7d
\n} msg_t;<\/p>\n int main() {
\n printf("\\\\n=== [WRITER] \u6d88\u606f\u961f\u5217\u5199\u8fdb\u7a0b\u542f\u52a8 (PID=%d) ===\\\\n", getpid());<\/p>\n \/\/ ——————————————————–
\n \/\/ \u6b65\u9aa4 1: \u521b\u5efa\u6d88\u606f\u961f\u5217\u5c5e\u6027\u5bf9\u8c61
\n \/\/ ——————————————————–
\n struct mq_attr attr = {0};
\n attr.mq_flags = 0; \/\/ 0 = \u963b\u585e\u6a21\u5f0f（O_NONBLOCK \u53ef\u8bbe\u4e3a\u975e\u963b\u585e）
\n attr.mq_maxmsg = MAX_MSG; \/\/ \u961f\u5217\u6700\u5927\u6d88\u606f\u6570
\n attr.mq_msgsize = MAX_MSG_SIZE; \/\/ \u5355\u6761\u6d88\u606f\u6700\u5927\u5b57\u8282\u6570
\n attr.mq_curmsgs = 0; \/\/ \u5f53\u524d\u6d88\u606f\u6570（\u53ea\u8bfb，\u521b\u5efa\u65f6\u5ffd\u7565）<\/p>\n printf("[1] \u914d\u7f6e\u6d88\u606f\u961f\u5217\u5c5e\u6027: max=%d, size=%d\\\\n",
\n attr.mq_maxmsg, attr.mq_msgsize);<\/p>\n \/\/ ——————————————————–
\n \/\/ \u6b65\u9aa4 2: \u521b\u5efa\/\u6253\u5f00 POSIX \u6d88\u606f\u961f\u5217
\n \/\/ ——————————————————–
\n mqd_t mq = mq_open(MQ_NAME, O_CREAT | O_EXCL | O_WRONLY, MQ_PERM, &attr);
\n if (mq == (mqd_t)-1) {
\n if (errno == EEXIST) {
\n printf(" \u6d88\u606f\u961f\u5217 %s \u5df2\u5b58\u5728，\u5c1d\u8bd5\u6253\u5f00…\\\\n", MQ_NAME);
\n mq = mq_open(MQ_NAME, O_WRONLY);
\n if (mq == (mqd_t)-1) {
\n perror("\u274c mq_open (fallback) \u5931\u8d25");
\n exit(EXIT_FAILURE);
\n }
\n } else {
\n perror("\u274c mq_open \u521b\u5efa\u6d88\u606f\u961f\u5217\u5931\u8d25");
\n exit(EXIT_FAILURE);
\n }
\n }
\n printf("[2] mq_open \u521b\u5efa\u6d88\u606f\u961f\u5217\u6210\u529f: %s, mqd=%d\\\\n", MQ_NAME, mq);<\/p>\n \/\/ ——————————————————–
\n \/\/ \u6b65\u9aa4 3: \u53d1\u9001\u591a\u6761\u6d88\u606f（\u81ea\u52a8\u963b\u585e\u76f4\u5230\u961f\u5217\u6709\u7a7a\u95f4）
\n \/\/ ——————————————————–
\n msg_t msg;
\n for (int i = 0; i < 3; i++) {
\n msg.type = i + 1;
\n snprintf(msg.data, sizeof(msg.data),
\n "Message #%d from Writer (PID=%d)", i+1, getpid());<\/p>\n if (mq_send(mq, (char*)&msg, sizeof(msg), 0) == -1) { \/\/ \u4f18\u5148\u7ea7=0
\n perror("\u274c mq_send \u5931\u8d25");
\n break;
\n }
\n printf("[3.%d] mq_send \u6210\u529f: \\\\"%s\\\\"\\\\n", i+1, msg.data);
\n sleep(1); \/\/ \u6a21\u62df\u95f4\u9694\u53d1\u9001
\n }<\/p>\n \/\/ ——————————————————–
\n \/\/ \u6b65\u9aa4 4: \u53d1\u9001\u7ec8\u6b62\u4fe1\u53f7（\u7279\u6b8a\u6d88\u606f）
\n \/\/ ——————————————————–
\n msg.type = 999;
\n strcpy(msg.data, "TERMINATE");
\n if (mq_send(mq, (char*)&msg, sizeof(msg), 1) == -1) { \/\/ \u9ad8\u4f18\u5148\u7ea7=1
\n perror("\u274c \u7ec8\u6b62\u6d88\u606f\u53d1\u9001\u5931\u8d25");
\n } else {
\n printf("[4] \u53d1\u9001\u9ad8\u4f18\u5148\u7ea7\u7ec8\u6b62\u4fe1\u53f7 (priority=1)\\\\n");
\n }<\/p>\n \/\/ ——————————————————–
\n \/\/ \u6b65\u9aa4 5: \u5173\u95ed\u6d88\u606f\u961f\u5217\u63cf\u8ff0\u7b26
\n \/\/ ——————————————————–
\n if (mq_close(mq) == -1) {
\n perror("\u274c mq_close \u5931\u8d25");
\n }
\n printf("[5] mq_close \u5173\u95ed\u6d88\u606f\u961f\u5217\u63cf\u8ff0\u7b26\u6210\u529f\\\\n");<\/p>\n \/\/ ——————————————————–
\n \/\/ \u6b65\u9aa4 6: \u5220\u9664\u6d88\u606f\u961f\u5217\u540d\u79f0（\u521b\u5efa\u8005\u8d1f\u8d23\u6e05\u7406）
\n \/\/ ——————————————————–
\n \/\/ \u6ce8\u610f：\u5b9e\u9645\u9500\u6bc1\u9700\u7b49\u5f85\u6240\u6709\u8fdb\u7a0b mq_close \u540e
\n if (mq_unlink(MQ_NAME) == -1) {
\n if (errno != ENOENT) { \/\/ \u53ef\u80fd\u5df2\u88ab\u5176\u4ed6\u8fdb\u7a0b unlink
\n perror("\u274c mq_unlink \u5931\u8d25");
\n }
\n } else {
\n printf("[6] mq_unlink \u5220\u9664\u6d88\u606f\u961f\u5217\u540d\u79f0\u6210\u529f: %s\\\\n", MQ_NAME);
\n }<\/p>\n printf("=== [WRITER] \u5199\u8fdb\u7a0b\u6b63\u5e38\u9000\u51fa ===\\\\n\\\\n");
\n return 0;
\n} <\/p>\n 1.3\u00a0mq_reader.c<\/h3>\n\/\/ mq_reader.c – \u6d88\u606f\u961f\u5217\u8bfb\u8fdb\u7a0b（\u63a5\u6536\u8005）
\n\/\/ \u7f16\u8bd1：gcc mq_reader.c -o mq_reader -lrt
\n\/\/ \u8fd0\u884c：\u5148\u8fd0\u884c .\/mq_writer，\u518d\u8fd0\u884c .\/mq_reader<\/p>\n #include <stdio.h>
\n#include <stdlib.h>
\n#include <string.h>
\n#include <fcntl.h>
\n#include <sys\/stat.h>
\n#include <mqueue.h>
\n#include <unistd.h>
\n#include <errno.h><\/p>\n \/\/ ============ \u914d\u7f6e\u53c2\u6570（\u5fc5\u987b\u4e0e writer \u4e00\u81f4） ============
\n#define MQ_NAME "\/my_message_queue"
\n#define MAX_MSG_SIZE 256
\n\/\/ =====================================================<\/p>\n typedef struct {
\n int type;
\n char data[256];
\n} msg_t;<\/p>\n int main() {
\n printf(" \u8bfb\u8fdb\u7a0b\u7b49\u5f85 1 \u79d2，\u786e\u4fdd\u5199\u8fdb\u7a0b\u5148\u521b\u5efa\u961f\u5217…\\\\n");
\n sleep(1);<\/p>\n printf("\\\\n=== [READER] \u6d88\u606f\u961f\u5217\u8bfb\u8fdb\u7a0b\u542f\u52a8 (PID=%d) ===\\\\n", getpid());<\/p>\n \/\/ ——————————————————–
\n \/\/ \u6b65\u9aa4 1: \u6253\u5f00\u5df2\u5b58\u5728\u7684\u6d88\u606f\u961f\u5217（\u53ea\u8bfb\u6a21\u5f0f）
\n \/\/ ——————————————————–
\n mqd_t mq = mq_open(MQ_NAME, O_RDONLY);
\n if (mq == (mqd_t)-1) {
\n perror("\u274c mq_open \u6253\u5f00\u6d88\u606f\u961f\u5217\u5931\u8d25（\u786e\u8ba4\u5199\u8fdb\u7a0b\u5df2\u8fd0\u884c）");
\n exit(EXIT_FAILURE);
\n }
\n printf("[1] mq_open \u6253\u5f00\u6d88\u606f\u961f\u5217\u6210\u529f: %s, mqd=%d\\\\n", MQ_NAME, mq);<\/p>\n \/\/ ——————————————————–
\n \/\/ \u6b65\u9aa4 2: \u83b7\u53d6\u961f\u5217\u5c5e\u6027（\u9a8c\u8bc1\u914d\u7f6e）
\n \/\/ ——————————————————–
\n struct mq_attr attr;
\n if (mq_getattr(mq, &attr) == -1) {
\n perror("\u274c mq_getattr \u5931\u8d25");
\n } else {
\n printf("[2] \u961f\u5217\u72b6\u6001: \u5f53\u524d\u6d88\u606f\u6570=%ld, \u6700\u5927\u6d88\u606f\u6570=%ld, \u6d88\u606f\u5927\u5c0f=%ld\\\\n",
\n attr.mq_curmsgs, attr.mq_maxmsg, attr.mq_msgsize);
\n }<\/p>\n \/\/ ——————————————————–
\n \/\/ \u6b65\u9aa4 3: \u5faa\u73af\u63a5\u6536\u6d88\u606f（\u81ea\u52a8\u963b\u585e\u76f4\u5230\u6d88\u606f\u5230\u8fbe）
\n \/\/ ——————————————————–
\n msg_t msg;
\n unsigned int prio;
\n ssize_t bytes_read;<\/p>\n printf("[3] \u5f00\u59cb\u63a5\u6536\u6d88\u606f（\u963b\u585e\u6a21\u5f0f）…\\\\n");
\n while (1) {
\n \/\/ \u7b2c\u4e09\u4e2a\u53c2\u6570\u5fc5\u987b >= mq_msgsize，\u5426\u5219\u53ef\u80fd\u622a\u65ad
\n bytes_read = mq_receive(mq, (char*)&msg, MAX_MSG_SIZE, &prio);<\/p>\n if (bytes_read == -1) {
\n if (errno == EINTR) continue; \/\/ \u88ab\u4fe1\u53f7\u4e2d\u65ad，\u91cd\u8bd5
\n perror("\u274c mq_receive \u5931\u8d25");
\n break;
\n }<\/p>\n printf("[3.%ld] \u6536\u5230\u6d88\u606f (priority=%u, type=%d): \\\\"%s\\\\"\\\\n",
\n bytes_read, prio, msg.type, msg.data);<\/p>\n \/\/ \u68c0\u67e5\u7ec8\u6b62\u4fe1\u53f7
\n if (msg.type == 999 && strcmp(msg.data, "TERMINATE") == 0) {
\n printf(" [!] \u6536\u5230\u7ec8\u6b62\u4fe1\u53f7，\u9000\u51fa\u5faa\u73af…\\\\n");
\n break;
\n }<\/p>\n sleep(1); \/\/ \u6a21\u62df\u5904\u7406\u5ef6\u8fdf
\n }<\/p>\n \/\/ ——————————————————–
\n \/\/ \u6b65\u9aa4 4: \u5173\u95ed\u6d88\u606f\u961f\u5217\u63cf\u8ff0\u7b26
\n \/\/ ——————————————————–
\n if (mq_close(mq) == -1) {
\n perror("\u274c mq_close \u5931\u8d25");
\n }
\n printf("[4] mq_close \u5173\u95ed\u6d88\u606f\u961f\u5217\u63cf\u8ff0\u7b26\u6210\u529f\\\\n");<\/p>\n printf("=== [READER] \u8bfb\u8fdb\u7a0b\u6b63\u5e38\u9000\u51fa ===\\\\n\\\\n");
\n return 0;
\n} <\/p>\n 1.4 \u63a5\u53e3<\/h3>\n\n\n\u51fd\u6570<\/p>\n \u4f5c\u7528<\/p>\n \u5173\u952e\u53c2\u6570\u8bf4\u660e<\/p>\n<\/tr>\n \n\n| \n mq_open(name, flags, mode, attr)<\/p>\n<\/td>\n | \n \u521b\u5efa\/\u6253\u5f00\u961f\u5217<\/p>\n<\/td>\n | attr \u4ec5\u521b\u5efa\u65f6\u6709\u6548；O_NONBLOCK \u8bbe\u975e\u963b\u585e<\/td>\n<\/tr>\n | \n| \n mq_send(mqd, msg, len, prio)<\/p>\n<\/td>\n | \n \u53d1\u9001\u6d88\u606f<\/p>\n<\/td>\n | \n prio \u8303\u56f4 0~`MQ_PRIO_MAX-1`（\u901a\u5e3832767）<\/p>\n<\/td>\n<\/tr>\n | \n| \n mq_receive(mqd, buf, size, prio)<\/p>\n<\/td>\n | \n \u63a5\u6536\u6d88\u606f<\/p>\n<\/td>\n | \n prio \u8fd4\u56de\u6d88\u606f\u4f18\u5148\u7ea7；\u963b\u585e\u76f4\u5230\u6709\u6d88\u606f<\/p>\n<\/td>\n<\/tr>\n | \n| \n mq_getattr(mqd, attr)<\/p>\n<\/td>\n | \n \u83b7\u53d6\u961f\u5217\u72b6\u6001<\/p>\n<\/td>\n | \n attr.mq_curmsgs \u67e5\u770b\u5f53\u524d\u6d88\u606f\u6570<\/p>\n<\/td>\n<\/tr>\n | \n| \n mq_setattr(mqd, new, old)<\/p>\n<\/td>\n | \n \u8bbe\u7f6e\/\u83b7\u53d6\u5c5e\u6027<\/p>\n<\/td>\n | \u4ec5 mq_flags \u53ef\u4fee\u6539（\u5207\u6362\u963b\u585e\u6a21\u5f0f）<\/td>\n<\/tr>\n | \n| \n mq_close(mqd)<\/p>\n<\/td>\n | \n \u5173\u95ed\u63cf\u8ff0\u7b26<\/p>\n<\/td>\n | \n \u8fdb\u7a0b\u9000\u51fa\u524d\u5fc5\u987b\u8c03\u7528<\/p>\n<\/td>\n<\/tr>\n | \n| \n mq_unlink(name)<\/p>\n<\/td>\n | \n \u5220\u9664\u961f\u5217\u540d\u79f0<\/p>\n<\/td>\n | \n \u4ec5\u521b\u5efa\u8005\u8c03\u7528；\u5b9e\u9645\u9500\u6bc1\u9700\u6240\u6709\u8fdb\u7a0b close<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n 1.5 \u6d41\u7a0b<\/h3>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 POSIX \u6d88\u606f\u961f\u5217\u901a\u4fe1\u6d41\u7a0b（\u963b\u585e\u6a21\u5f0f） \u2502
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n 🟦 \u5199\u8fdb\u7a0b (Sender) 🟩 \u8bfb\u8fdb\u7a0b (Receiver)
\n \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500
\n \u2502 \u2502
\n \u25bc \u25bc
\n [1] mq_open(CREAT) [1] mq_open(OPEN)
\n (\u521b\u5efa\u961f\u5217，\u8bbe max=10) (\u6253\u5f00\u5df2\u6709\u961f\u5217)
\n \u2502 \u2502
\n \u2502 \u25bc
\n \u2502 [2] mq_getattr
\n \u2502 (\u67e5\u770b\u961f\u5217\u72b6\u6001)
\n \u2502 \u2502
\n \u25bc \u2502
\n [2] mq_send(msg1) \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25ba [3] mq_receive()
\n (\u53d1\u9001\u6d88\u606f) \u3010\u5185\u6838\u81ea\u52a8\u5165\u961f\u3011 (\u963b\u585e\u7b49\u5f85…)
\n \u2502 \u2502 \u2502
\n \u2502 \u25bc \u2502
\n \u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502
\n \u2502 \u2502 \u6d88\u606f\u961f\u5217 \u2502 \u2502
\n \u2502 \u2502 [msg1] \u2502\u25c4\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
\n \u2502 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
\n \u2502 \u2502
\n \u25bc \u25bc
\n [3] mq_send(msg2) \u2500\u2500\u2500\u25ba [msg1,msg2] \u2500\u2500\u2500\u25ba mq_receive() \u8fd4\u56de msg1
\n \u2502 \u2502
\n \u2502 \u25bc
\n \u2502 \u5904\u7406 msg1 (sleep 1s)
\n \u2502 \u2502
\n \u25bc \u25bc
\n [4] mq_send(TERM) \u2500\u2500\u2500\u25ba [msg2,TERM] \u2500\u2500\u2500\u25ba mq_receive() \u8fd4\u56de msg2
\n \u2502 \u2502
\n \u2502 \u25bc
\n \u2502 \u5904\u7406 msg2
\n \u2502 \u2502
\n \u2502 \u25bc
\n \u2502 mq_receive() \u8fd4\u56de TERM
\n \u2502 \u2502
\n \u25bc \u25bc
\n [5] mq_close [4] \u68c0\u6d4b\u5230\u7ec8\u6b62\u4fe1\u53f7
\n \u2502 \u2502
\n \u25bc \u25bc
\n [6] mq_unlink (\u6807\u8bb0\u5220\u9664) [5] mq_close
\n \u2502 \u2502
\n \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
\n \u25bc
\n \u5185\u6838\u56de\u6536\u8d44\u6e90
\n (\u5f53\u6240\u6709\u8fdb\u7a0b mq_close \u540e\u81ea\u52a8\u9500\u6bc1) <\/p>\n 2. \u539f\u7406<\/h2>\n2.1 \u751f\u547d\u5468\u671f<\/h3>\n\u4e0e\u6709\u540d\u4fe1\u53f7\u91cf\u548c\u5171\u4eab\u5185\u5b58\u4e00\u6837，POSIX \u6d88\u606f\u961f\u5217\u662f "\u4e00\u5207\u7686\u6587\u4ef6"\u00a0\u7684\u7406\u5ff5：<\/p>\n \n- \u6302\u8f7d\u70b9：\/dev\/mqueue（tmpfs \u6587\u4ef6\u7cfb\u7edf）<\/li>\n
- \u5185\u6838\u5bf9\u8c61：\u6bcf\u4e2a\u961f\u5217\u5bf9\u5e94\u4e00\u4e2a inode，\u5b58\u50a8\u5728\u5185\u5b58\u4e2d<\/li>\n
- \u7528\u6237\u6001\u63a5\u53e3：mqd_t\u00a0\u672c\u8d28\u662f\u6587\u4ef6\u63cf\u8ff0\u7b26（fd）<\/li>\n<\/ul>\n
\n\n\u64cd\u4f5c<\/p>\n POSIX \u6d88\u606f\u961f\u5217<\/p>\n<\/tr>\n \n\n| \n \u521b\u5efa<\/p>\n<\/td>\n | mq_open(O_CREAT)<\/td>\n<\/tr>\n | \n| \n \u6807\u8bb0\u5220\u9664<\/p>\n<\/td>\n | \n mq_unlink()（\u7acb\u5373\u79fb\u9664\u540d\u79f0）<\/p>\n<\/td>\n<\/tr>\n | \n| \n \u5b9e\u9645\u9500\u6bc1<\/p>\n<\/td>\n | \n \u6240\u6709\u8fdb\u7a0b mq_close() \u540e<\/p>\n<\/td>\n<\/tr>\n | \n| \n \u8fdb\u7a0b\u5d29\u6e83<\/p>\n<\/td>\n | \n \u5185\u6838\u81ea\u52a8 mq_close()<\/p>\n<\/td>\n<\/tr>\n | \n| \n \u6b8b\u7559\u98ce\u9669<\/p>\n<\/td>\n | \n \u672a mq_unlink\u00a0\u4f1a\u6b8b\u7559\u6587\u4ef6<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u521b\u5efa\u8005\u8fdb\u7a0b\u5728 mq_open()\u00a0\u6210\u529f\u540e\u5e94\u7acb\u5373\u8c03\u7528\u00a0mq_unlink()，\u786e\u4fdd\u8d44\u6e90\u81ea\u52a8\u56de\u6536\u3002<\/p>\n \u540c\u7406，\u5171\u4eab\u5185\u5b58\u548c\u4fe1\u53f7\u91cf\u4e5f\u5e94\u8fd9\u6837\u5b9e\u73b0，unlink \u4ec5\u5207\u65ad\u65b0\u8bbf\u95ee\u8def\u5f84，\u4e0d\u5f71\u54cd\u5df2\u6709\u5f15\u7528\u3002\u8d44\u6e90\u9500\u6bc1 = unlink \u6807\u8bb0 + \u5f15\u7528\u8ba1\u6570\u5f52\u96f6<\/p>\n mqd_t mq = mq_open("\/myq", O_CREAT | O_RDWR, 0664, &attr);
\nmq_unlink("\/myq"); \/\/ \u7acb\u5373\u6807\u8bb0\u5220\u9664，\u4f46\u961f\u5217\u4ecd\u53ef\u7528
\n\/\/ … \u6b63\u5e38\u901a\u4fe1 …
\nmq_close(mq); \/\/ \u6700\u540e\u4e00\u4e2a close \u89e6\u53d1\u5185\u6838\u9500\u6bc1 <\/p>\n 2.2 \u963b\u585e\/\u975e\u963b\u585e<\/h3>\n\/\/ \u521d\u59cb\u521b\u5efa\u4e3a\u963b\u585e\u6a21\u5f0f
\nmqd_t mq = mq_open("\/myq", O_RDWR | O_CREAT, 0664, &attr);<\/p>\n \/\/ \u8fd0\u884c\u65f6\u5207\u6362\u4e3a\u975e\u963b\u585e
\nstruct mq_attr new_attr = {0}, old_attr;
\nnew_attr.mq_flags = O_NONBLOCK;
\nmq_setattr(mq, &new_attr, &old_attr);<\/p>\n \/\/ \u975e\u963b\u585e\u63a5\u6536（\u65e0\u6d88\u606f\u7acb\u5373\u8fd4\u56de EAGAIN）
\nssize_t n = mq_receive(mq, buf, size, NULL);
\nif (n == -1 && errno == EAGAIN) {
\n printf("\u65e0\u6d88\u606f\u53ef\u7528，\u7ee7\u7eed\u5176\u4ed6\u5de5\u4f5c…\\\\n");
\n} <\/p>\n 2.3 \u4f18\u5148\u7ea7<\/h3>\n2.3.1 \u539f\u7406<\/h4>\n\n\n\u9879\u76ee<\/p>\n \u8bf4\u660e<\/p>\n \u7ec6\u8282<\/p>\n<\/tr>\n \n\n| \n \u4f18\u5148\u7ea7\u8303\u56f4<\/p>\n<\/td>\n | \n 0 \u5230 MQ_PRIO_MAX – 1<\/p>\n<\/td>\n | \n \u9ed8\u8ba4 MQ_PRIO_MAX = 32768（\u5373 0~32767）<\/p>\n<\/td>\n<\/tr>\n | \n| \n \u6570\u503c<\/p>\n<\/td>\n | \n \u6570\u503c\u8d8a\u5927，\u4f18\u5148\u7ea7\u8d8a\u9ad8<\/p>\n<\/td>\n | \n prio=32767 \u662f\u6700\u9ad8\u4f18\u5148\u7ea7，prio=0 \u662f\u6700\u4f4e<\/p>\n<\/td>\n<\/tr>\n | \n| \n \u63a5\u6536\u987a\u5e8f<\/p>\n<\/td>\n | \n \u603b\u662f\u8fd4\u56de\u5f53\u524d\u6700\u9ad8\u4f18\u5148\u7ea7\u6d88\u606f<\/p>\n<\/td>\n | \n \u4e0e\u53d1\u9001\u987a\u5e8f\u65e0\u5173，\u5b8c\u5168\u7531\u4f18\u5148\u7ea7\u51b3\u5b9a<\/p>\n<\/td>\n<\/tr>\n | \n| \n \u540c\u4f18\u5148\u7ea7<\/p>\n<\/td>\n | \n FIFO \u987a\u5e8f（\u5148\u53d1\u9001\u5148\u63a5\u6536）<\/p>\n<\/td>\n | \n \u5185\u6838\u7ea2\u9ed1\u6811\u4e2d\u540c\u4f18\u5148\u7ea7\u6d88\u606f\u6309\u65f6\u95f4\u6233\u6392\u5e8f<\/p>\n<\/td>\n<\/tr>\n | \n| \n \u53d1\u9001\u63a5\u53e3<\/p>\n<\/td>\n | \n mq_send(mqd, msg, len, prio)<\/p>\n<\/td>\n | \n prio\u00a0\u662f\u72ec\u7acb\u53c2\u6570，\u4e0d\u5360\u7528\u6d88\u606f\u4f53\u7a7a\u95f4<\/p>\n<\/td>\n<\/tr>\n | \n| \n \u63a5\u6536\u63a5\u53e3<\/p>\n<\/td>\n | \n mq_receive(mqd, buf, size, &prio)<\/p>\n<\/td>\n | \n \u53ef\u9009\u83b7\u53d6\u5b9e\u9645\u4f18\u5148\u7ea7\u503c<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \u6d88\u606f\u961f\u5217\u7ea2\u9ed1\u6811（\u6309 priority \u964d\u5e8f\u6392\u5217）：
\n [prio=10] \u2190 \u6839\u8282\u70b9（\u975e\u6700\u5927\u503c）
\n \/ \\\\
\n [prio=5] [prio=15] \u2190 \u6700\u53f3\u8282\u70b9 = \u6700\u9ad8\u4f18\u5148\u7ea7
\n \/ \\\\ \\\\
\n[prio=3] [prio=7] [prio=20] \u2190 mq_receive() \u6bcf\u6b21\u53d6\u6b64\u8282\u70b9<\/p>\n \u63a5\u6536\u6d41\u7a0b：
\n1. mq_receive() \u2192 rb_last() \u2192 \u627e\u5230 prio=20 \u8282\u70b9
\n2. \u5220\u9664\u8be5\u8282\u70b9 \u2192 \u91cd\u65b0\u5e73\u8861\u7ea2\u9ed1\u6811
\n3. \u4e0b\u6b21\u63a5\u6536 \u2192 rb_last() \u2192 prio=15 \u8282\u70b9 <\/p>\n \n- \u63d2\u5165（mq_send）：O(log n)<\/li>\n
- \u5220\u9664（mq_receive）：O(log n)<\/li>\n
- \u67e5\u627e\u6700\u5927\u503c：O(1)（\u901a\u8fc7 rb_last\u00a0\u76f4\u63a5\u5b9a\u4f4d\u6700\u53f3\u8282\u70b9）<\/li>\n<\/ul>\n
2.3.2 \u907f\u514d\u4f18\u5148\u7ea7\u53cd\u8f6c<\/h4>\n\/\/ \u274c \u53cd\u6a21\u5f0f：\u9ad8\u4f18\u5148\u7ea7\u6d88\u606f\u4f9d\u8d56\u4f4e\u4f18\u5148\u7ea7\u8d44\u6e90
\nmq_send(high_prio_mq, "\u9700\u8981\u9501A", 32767); \/\/ \u9ad8\u4f18\u5148\u7ea7\u6d88\u606f
\n\/\/ \u4f46\u5904\u7406\u8be5\u6d88\u606f\u9700\u7b49\u5f85\u88ab\u4f4e\u4f18\u5148\u7ea7\u8fdb\u7a0b\u6301\u6709\u7684\u9501 \u2192 \u4f18\u5148\u7ea7\u53cd\u8f6c<\/p>\n \/\/ \u2705 \u6b63\u786e\u6a21\u5f0f：\u8d44\u6e90\u9694\u79bb + \u4e13\u7528\u961f\u5217
\nmqd_t emergency_mq = create_queue("\/emergency", 10, 256); \/\/ \u4e13\u7528\u9ad8\u4f18\u5148\u7ea7\u961f\u5217
\nmqd_t normal_mq = create_queue("\/normal", 100, 256); \/\/ \u666e\u901a\u961f\u5217<\/p>\n \/\/ \u7d27\u6025\u6d88\u606f\u8d70\u4e13\u7528\u901a\u9053，\u4e0d\u4e0e\u666e\u901a\u6d88\u606f\u7ade\u4e89
\nif (is_emergency(cmd))
\n mq_send(emergency_mq, cmd, len, 32767);
\nelse
\n mq_send(normal_mq, cmd, len, 10000); <\/p>\n \u539f\u5219：\u9ad8\u4f18\u5148\u7ea7\u6d88\u606f\u5fc5\u987b\u6709\u72ec\u7acb\u8d44\u6e90\u901a\u9053，\u907f\u514d\u4e0e\u4f4e\u4f18\u5148\u7ea7\u6d88\u606f\u5171\u4eab\u961f\u5217\u5bfc\u81f4\u9690\u5f0f\u963b\u585e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":" 1.\u00a0\u6d88\u606f\u961f\u5217\u4f7f\u7528\u6d41\u7a0b
\n1.1 \u6982\u5ff5
\n\u6d88\u606f\u961f\u5217\u662f\u8fdb\u7a0b\u95f4\u901a\u4fe1（IPC）\u4e2d\u81ea\u5e26\u540c\u6b65\u673a\u5236\u7684\u901a\u4fe1\u65b9\u5f0f，\u5929\u7136\u907f\u514d\u7ade\u6001\u6761\u4ef6，mq_receive() \u4f1a\u963b\u585e\u76f4\u5230\u6d88\u606f\u5230\u8fbe，\u65e0\u9700\u989d\u5916\u540c\u6b65\u539f\u8bed\u3002 \u7279\u6027 \u5171\u4eab\u5185\u5b58 \u6d88\u606f\u961f\u5217 \u6570\u636e\u6a21\u578b \u65e0\u7ed3\u6784\u7684\u5b57\u8282\u6d41 \u6709\u8fb9\u754c\u7684\u6d88\u606f（\u81ea\u52a8\u5206\u5305） \u540c\u6b65\u673a\u5236 \u9700\u989d\u5916\u4fe1\u53f7\u91cf\/\u9501 \u5185\u7f6e\u963b\u585e\/\u5524\u9192\u673a\u5236 \u6570\u636e\u6301\u4e45\u6027 \u8fdb\u7a0b\u9000\u51fa\u540e\u6570\u636e\u4fdd\u7559 \u6d88\u606f\u5728\u63a5\u6536\u524d\u6301\u4e45\u5b58\u5728<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,174,235],"topic":[],"class_list":{"0":"post-79998","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-server","7":"tag-c","9":"tag-235"},"yoast_head":"\n \u901a\u4fe1\uff1a(9) \u6d88\u606f\u961f\u5217\u4e0e\u4f18\u5148\u7ea7\u53cd\u8f6c - 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