Changeset 2405bb5 in mainline for kernel/generic/include/ipc/ipc.h

Timestamp:

2012-08-15T19:28:43Z (12 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

7975433

Parents:

691d8d8

Message:

Forget active calls when a task exits.

• Synchronization between answer and forget.
• Forgotten calls are not yet properly cleaned-up.
• Hold the sender task when processing its active calls.

File:

• kernel/generic/include/ipc/ipc.h (modified) (2 diffs)

kernel/generic/include/ipc/ipc.h

@@ -106 +106 @@
 
 typedef struct {
-        /** Task link. */
+        /**
+         * Task link.
+         * Valid only when the call is not forgotten.
+         * Protected by the task's active_calls_lock.
+         */
         link_t ta_link;
 
@@ -113 +117 @@
         
         unsigned int flags;
+
+        /** Protects the forget member. */
+        SPINLOCK_DECLARE(forget_lock);
+
+        /**
+         * True if the caller 'forgot' this call and donated it to the callee.
+         * Forgotten calls are discarded upon answering (the answer is not
+         * delivered) and answered calls cannot be forgotten. Forgotten calls
+         * also do not figure on the task's active call list.
+         *
+         * We keep this separate from the flags so that it is not necessary
+         * to take a lock when accessing them.
+         */
+        bool forget;
         
-        /** Identification of the caller. */
+        /**
+         * Identification of the caller.
+         * Valid only when the call is not forgotten.
+         */
         struct task *sender;