Messages in this thread Patch in this message | | | From | Manfred Spraul <> | Subject | [PATCH 5/6] ipc/sem.c: Store which operation blocks in perform_atomic_semop() | Date | Sat, 10 May 2014 12:03:18 +0200 |
| |
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 <manfred@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
| |