Changeset 577f042a in mainline for kernel/generic/src/proc/task.c

Timestamp:

2011-01-27T17:57:29Z (13 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

5378f99

Parents:

875c629

Message:

• improve synchronization in sys_task_set_name()
• improve printouts of 'threads' kernel console command

File:

• kernel/generic/src/proc/task.c (modified) (1 diff)

kernel/generic/src/proc/task.c

@@ -342 +342 @@
 sysarg_t sys_task_set_name(const char *uspace_name, size_t name_len)
 {
-        int rc;
         char namebuf[TASK_NAME_BUFLEN];
         
         /* Cap length of name and copy it from userspace. */
-        
         if (name_len > TASK_NAME_BUFLEN - 1)
                 name_len = TASK_NAME_BUFLEN - 1;
         
-        rc = copy_from_uspace(namebuf, uspace_name, name_len);
+        int rc = copy_from_uspace(namebuf, uspace_name, name_len);
         if (rc != 0)
                 return (sysarg_t) rc;
         
         namebuf[name_len] = '\0';
+        
+        /*
+         * As the task name is referenced also from the
+         * threads, lock the threads' lock for the course
+         * of the update.
+         */
+        
+        irq_spinlock_lock(&tasks_lock, true);
+        irq_spinlock_lock(&TASK->lock, false);
+        irq_spinlock_lock(&threads_lock, false);
+        
+        /* Set task name */
         str_cpy(TASK->name, TASK_NAME_BUFLEN, namebuf);
+        
+        irq_spinlock_unlock(&threads_lock, false);
+        irq_spinlock_unlock(&TASK->lock, false);
+        irq_spinlock_unlock(&tasks_lock, true);
         
         return EOK;