Preparation for the next patch:
In the slow-path of perform_atomic_semop(), store a pointer to the operation
that caused the operation to block.
Signed-off-by: Manfred Spraul <manf...@colorfullife.com>
---
ipc/sem.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/ipc/sem.c b/ipc/sem.c
index 3962cca..22a4c12 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -109,6 +109,7 @@ struct sem_queue {
int pid; /* process id of requesting process */
int status; /* completion status of operation */
struct sembuf *sops; /* array of pending operations */
+ struct sembuf *blocking; /* the operation that blocked */
int nsops; /* number of operations */
int alter; /* does *sops alter the array? */
};
@@ -642,6 +643,8 @@ out_of_range:
goto undo;
would_block:
+ q->blocking = sop;
+
if (sop->sem_flg & IPC_NOWAIT)
result = -EAGAIN;
else
--
1.9.0
--
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