From: Andre <maan@p133.(none)>
Date: Tue, 21 Feb 2006 15:42:12 +0000 (+0100)
Subject: make para_server use the new ipc subsystem
X-Git-Tag: v0.2.11~65
X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=commitdiff_plain;h=bc6c214340c1760203b24097c2066abfcaa1c539

make para_server use the new ipc subsystem

Straight-forward conversion.

This BTW gets rid of the ancient /dev/zero hack which worked pretty
well for all the years but is not general enough for the plm dbtool.

Another 42 also disappeared ;)
---

diff --git a/server.c b/server.c
index a6fca8b6..c46966ea 100644
--- a/server.c
+++ b/server.c
@@ -34,12 +34,12 @@
 #include "afs.h"
 #include "config.h"
 #include "close_on_fork.h"
-#include <sys/mman.h> /* MAP_SHARED, PROT_READ, PROT_WRITE */
 #include "send.h"
 #include "error.h"
 #include "net.h"
 #include "daemon.h"
 #include "string.h"
+#include "ipc.h"
 
 /** define the array of error lists needed by para_server */
 INIT_SERVER_ERRLISTS;
@@ -108,7 +108,7 @@ struct sender senders[] = {
 
 /* global variables for server-internal use */
 static FILE *logfile;
-static int mmd_semid;
+static int mmd_mutex, mmd_shm_id;
 static int signal_pipe;
 
 /**
@@ -151,27 +151,27 @@ void para_log(int ll, char* fmt,...)
 	va_end(argp);
 }
 
-
 /*
- * setup shared memory area and get semaphore for locking
+ * setup shared memory area and get mutex for locking
  */
 static void shm_init(void)
 {
-	int fd;
-	caddr_t area;
+	void *shm;
+	int ret = shm_new(sizeof(struct misc_meta_data));
 
-	if ((fd = open("/dev/zero", O_RDWR)) < 0) {
-		PARA_EMERG_LOG("%s", "failed to open /dev/zero\n");
-		exit(EXIT_FAILURE);
-	}
-	if ((area = mmap(0, sizeof(struct misc_meta_data),
-			PROT_READ | PROT_WRITE,
-			MAP_SHARED, fd, 0)) == (caddr_t) - 1) {
-		PARA_EMERG_LOG("%s", "mmap error\n");
-		exit(EXIT_FAILURE);
-	}
-	close(fd); /* we dont need /dev/zero anymore */
-	mmd = (struct misc_meta_data *)area;
+	if (ret < 0)
+		goto err_out;
+
+	ret = shm_attach(ret, ATTACH_RW, &shm);
+	if (ret < 0)
+		goto err_out;
+	mmd = shm;
+	mmd_shm_id = ret;
+
+	ret = mutex_new();
+	if (ret < 0)
+		goto err_out;
+	mmd_mutex = ret;
 
 	mmd->dbt_num = 0;
 	mmd->num_played = 0;
@@ -184,21 +184,10 @@ static void shm_init(void)
 	mmd->afs_status_flags = AFS_NEXT;
 	mmd->new_afs_status_flags = AFS_NEXT;
 	mmd->sender_cmd_data.cmd_num = -1;
-
-	mmd_semid = semget(42, 1, IPC_CREAT | 0666);
-	if (mmd_semid == -1) {
-		PARA_EMERG_LOG("%s", "semget failed\n");
-		exit(EXIT_FAILURE);
-	}
-}
-
-static void do_semop(struct sembuf *sops, int num)
-{
-	if (semop(mmd_semid, sops, num) >= 0)
-		return;
-	PARA_WARNING_LOG("semop failed (%s), retrying\n", strerror(errno));
-	while (semop(mmd_semid, sops, num) < 0)
-		; /* nothing */
+	return;
+err_out:
+	PARA_EMERG_LOG("%s", PARA_STRERROR(-ret));
+	exit(EXIT_FAILURE);
 }
 
 /**
@@ -208,19 +197,7 @@ static void do_semop(struct sembuf *sops, int num)
  */
 void mmd_lock(void)
 {
-	struct sembuf sops[2] = {
-		{
-			.sem_num = 0,
-			.sem_op = 0,
-			.sem_flg = SEM_UNDO
-		},
-		{
-			.sem_num = 0,
-			.sem_op = 1,
-			.sem_flg = SEM_UNDO
-		}
-	};
-	do_semop(sops, 2);
+	mutex_lock(mmd_mutex);
 }
 
 /**
@@ -228,16 +205,10 @@ void mmd_lock(void)
  *
  * \sa semop(2), struct misc_meta_data
  */
+
 void mmd_unlock(void)
 {
-	struct sembuf sops[1] = {
-		{
-			.sem_num = 0,
-			.sem_op = -1,
-			.sem_flg = SEM_UNDO
-		},
-	};
-	do_semop(sops, 1);
+	mutex_unlock(mmd_mutex);
 }
 
 static void parse_config(int override)
@@ -551,6 +522,10 @@ repeat:
 		case SIGTERM:
 			PARA_EMERG_LOG("terminating on signal %d\n", sig);
 			kill(0, SIGTERM);
+			dblist[mmd->dbt_num].shutdown();
+			mutex_destroy(mmd_mutex);
+			shm_detach(mmd);
+			shm_destroy(mmd_shm_id);
 			exit(EXIT_FAILURE);
 		}
 	}