ipc/sem.c: store which operation blocks in perform_atomic_semop()

[uclinux-h8/linux.git] / ipc / sem.c

diff --git a/ipc/sem.c b/ipc/sem.c
index b93b561..d61362b 100644 (file)
--- 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