From 09a82c2ece4caadad0baa0d1f3b84f1506363fdd Mon Sep 17 00:00:00 2001
From: wangzhengquan <wangzhengquan85@126.com>
Date: 星期五, 22 一月 2021 11:58:33 +0800
Subject: [PATCH] update
---
src/svsem.cpp | 105 +++++++++++++++++++++++++++++++---------------------
1 files changed, 62 insertions(+), 43 deletions(-)
diff --git a/src/svsem.cpp b/src/svsem.cpp
index 54db4a2..82390b6 100644
--- a/src/svsem.cpp
+++ b/src/svsem.cpp
@@ -6,7 +6,7 @@
perms = S_IRUSR | S_IWUSR;
- semid = semget(key, 1, IPC_CREAT | IPC_EXCL | perms);
+ semid = semget(key, 2, IPC_CREAT | IPC_EXCL | perms);
if (semid != -1) { /* Successfully created the semaphore */
union semun arg;
@@ -17,6 +17,10 @@
arg.val = 0; /* So initialize it to 0 */
if (semctl(semid, 0, SETVAL, arg) == -1)
err_exit(errno, "semctl 1");
+
+ arg.val = 1;
+ if (semctl(semid, 1, SETVAL, arg) == -1)
+ err_exit(errno, "semctl 2");
//logger.info("%ld: initialized semaphore\n", (long)getpid());
/* Perform a "no-op" semaphore operation - changes sem_otime
@@ -135,6 +139,63 @@
}
+
+
+int svsem_cond_wait(int semid ){
+
+ struct sembuf sops[2];
+ union semun arg;
+
+ arg.val = 1;
+ if (semctl(semid, 1, SETVAL, arg) == -1) {
+ err_msg(errno, "svsem_set");
+ return errno;
+ }
+
+ //閲婃斁mutex
+ sops[0].sem_num = 0;
+ sops[0].sem_op = 1;
+ sops[0].sem_flg = 0;
+
+ // 绛夊緟cond
+ sops[1].sem_num = 1;
+ sops[1].sem_op = 0;
+ sops[1].sem_flg = 0;
+
+ while (semop(semid, sops, 2) == -1)
+ if (errno != EINTR) {
+ // err_msg(errno, "Svsvsem_dec");
+ return errno;
+ }
+
+
+ //閲嶆柊鑾峰彇mutex
+ sops[0].sem_num = 0;
+ sops[0].sem_op = -1;
+ sops[0].sem_flg = 0;
+
+ while (semop(semid, sops, 1) == -1)
+ if (errno != EINTR) {
+ // err_msg(errno, "Svsvsem_dec");
+ return errno;
+ }
+
+ return 0;
+}
+
+
+int svsem_cond_signal(int semid ){
+ union semun arg;
+ arg.val = 0;
+
+ if (semctl(semid, 1, SETVAL, arg) == -1) {
+ err_msg(errno, "svsem_set");
+ return errno;
+ }
+ return 0;
+}
+
+
/**
* If sem_op equals 0, the value of the semaphore is checked to see whether it
* currently equals 0. If it does, the operation completes immediately; otherwise,
@@ -213,46 +274,4 @@
-
-int svsem_cond_wait(int semid ){
-
- struct sembuf sops[2];
-
- //閲婃斁mutex
- sops[0].sem_num = 0;
- sops[0].sem_op = 1;
- sops[0].sem_flg = 0;
-
- // 绛夊緟cond
- sops[1].sem_num = 1;
- sops[1].sem_op = -1;
- sops[1].sem_flg = 0;
-
- while (semop(semid, sops, 2) == -1)
- if (errno != EINTR) {
- // err_msg(errno, "Svsvsem_dec");
- return errno;
- }
-
-
-
-
- return 0;
-}
-
-int svsem_cond_signal(int semid ){
- struct sembuf sops;
-
- // 閫氱煡绛夊緟cond鐨勮繘绋�
- sops.sem_num = 1;
- sops.sem_op = 1;
- sops.sem_flg = 0;
-
- int rv = semop(semid, &sops, 1);
- if (rv == -1) {
- // err_msg(errno, "Svsvsem_inc");
- return errno;
- }
- return 0;
-}
\ No newline at end of file
--
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